Installation Owner Diagnostics - · PDF fileGERA-SVX01B-EN 5 General Information Unit...

GERA-SVX01B-EN

Models

“A” and later Design Sequence

60 HZ: GER -036, -048, -060, -072, -090, -120,

-150, -180, -240, -300

InstallationOwnerDiagnostics

AxiomTM RooftopWater-Source Comfort System

Models GER

© 2004 American Standard Inc. GERA-SVX01B-EN

Pre-installationChecklist

NOTICE:Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully.

WARNING -Indicates a potentially hazardous situation which, ifnot avoided, could result in death or serious injury.

CAUTION -Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. Itmay also be used to alert against unsafe practices.

CAUTION -Indicates a situation that may result in equipment or property-damage-only accidents.

NOTICE:Unit contains HCFC (R-22) Refrigerant

Instructions!

Section 608, Paragraph C of the 1990 Clean Air Act states:Effective July 1, 1992, it shall be unlawful for any person, in course of maintaining, servicing, repairing, or disposing of an air conditioning system, to knowingly vent or release any CFC or HCFC refrigerant. Minimal releases (air purges or refrigerant hoses) associated with good faith attempts to recapture or recycle are exempt from the ban on venting.

Important!Equipment is shipped FOB (Free on Board) at the manufacturer. Therefore, freight claims for damages against the carrier must be initiated by the receiver.

GERA-SVX01B-EN 3

Contents

Installation/Startup/CommissioningPre-installation Checklist 4

General Information 5

Dimensions/Weights 9

Installation Instructions 22

Electrical Requirements 34

Pre-Startup Checklist 48

Startup/CommissioningSequence of Operation 49

Startup Checklist & Log 51

Maintenance 52

Warranty Information 53

Troubleshooting Checklist 54

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Pre-installationChecklist

WARNINGFiberglass Wool!Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne particles of glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation. Glass wool fibers may also cause respiratory, skin or eye irritation.

Jobsite Inspection Always perform the following checks before accepting a unit:

1. Verify that the nameplate data matches the data on the sales order and bill of lading (including electrical data).

2. Verify that the power supply complies with the unit nameplate specifications.3. Visually inspect the exterior of the unit, for signs of shipping damage. Do not

sign the bill of lading accepting the unit(s) until inspection has been com-pleted. Check for damage promptly after the unit(s) are unloaded. Once the bill of lading is signed at the jobsite, the unit(s) are now the property of the SOLD TO party and future freight claims MAY NOT be accepted by the freight company.

4. After assuring that charge has been retained, reinstall the schrader caps to assure that refrigerant leakage does not occur.

5. After assuring that charge has been retained, reinstall the schrader caps to assure that refrigerant leakage does not occur.Verify that the refrigerant charge has been retained during shipment by use of gauges. Schrader taps are located internal to the cabinet.

6. After assuring that charge has been retained, reinstall the schrader caps to assure that refrigerant leakage does not occur.

Jobsite StorageTake precautions to prevent condensate from forming inside the unit’s electrical compartments and motors if:

1. If the unit is stored before it is installed.2. The unit is set on the roof curb, and temporary heat is provided in the build-

ing. Isolate all side panel service entrances and base pan openings (e.g. con-duit holes, supply air/return air openings, and flue openings) from the ambient air until the unit is ready for start-up.

The manufacturer will not assume any responsibility for equipment damage resulting form condensate accumulation on the unit’s electrical and/or mechani-cal components.

GERA-SVX01B-EN 5

GeneralInformation

Unit NameplateThe unit nameplate is located on the units’s corner support just above the main power entrance access into the control panel. It in-cludes the unit model number, se-rial number, electrical characteristics, refrigerant charge, and other pertinent unit data.

Compressor NameplateThe nameplate for the compres-sors are located on the compres-sor terminal box.

Unit DescriptionBefore shipment, each unit is leak tested, dehydrated, charged with refrigerant and compressor oil, and run tested for proper control operation.

Air-to-Refrigerant CoilThe air-to-refrigerant coil is alumi-num fin, mechanically bonded to the copper tubing.

Water-to-Refrigerant CoilThe water-to-refrigerant coil is a copper or cupro-nickel (option) and steel tube (tube-within-a-tube)design, leak tested to assure there is no cross leakage between the water tube (copper/cupro-nickel) and refrigerant gas (steel tube).

The control system offered to control the unit is a ReliaTelTM Control Module. It may be in-stalled as a standalone unit control module, or tied to a full building automation system.

The ReliaTelTM Control Module is a microelectronic control module that is referred to as a Refrigera-tion Module (RTRM). The acronym RTRM is used extensively

throughout this document when referring to the control system net-work.

These modules through Propor-tional/Integral control algorithms perform specific unit functions that govern unit operation in re-sponse to zone temperature, sup-ply air temperature and/or humidity conditions depending on the application. The stages of ca-pacity control for these units is achieved by starting and stopping the compressors.

The RTRM is mounted in the con-trol panel and is factory wired to the respective internal compo-nents. RTRM receives and inter-prets information from other unit modules, sensors, remote panels and customer binary contacts to satisfy the applicable request for cooling.

System Input Devices and FunctionsThe RTRM must have a mode in-put in order to operate the rooftop unit. The flexibility of having sev-eral mode capabilities depends upon the type of sensor and/or re-mote panel selected to interface with the RTRM. The possibilities are; Fan selection ON or AUTO, System selection HEAT, COOL, AUTO, and OFF.

The descriptions of the following basic input devices used with the RTRM network are to acquaint the operator with their function as they interface with the various modules. Refer to the unit’s electri-cal schematic for the specific mod-ule connections.

Compressor Disable (CPR1/2)This input incorporates the low (LPC) of each refrigeration circuit and can be activated by opening a field supplied contact installed in series with the LPC.

If this circuit is open before the compressor is started, the com-pressor will not be allowed to op-erate. Anytime this circuit is opened for 5-continuous seconds during compressor operation, the compressor for that circuit is im-mediately turned OFF. The com-pressor will not be allowed to restart for a minimum of 3-min-utes should the LPC close.

If four consecutive open condi-tions occur during the first 3-min-utes of operation, the compressor for that circuit will be locked out, a diagnostic communicated to the remote panel (if installed) and a manual reset will be required to re-start the compressor.

Low Pressure ControlWith the ReliaTel module, the low pressure will be activated when a field supplied contact is opened. Anytime this circuit is opened for 5-continuous seconds, the com-pressor for that circuit is turned off immediately. The compressor will not be allowed to restart for a min-imum of 3-minutes.

If four consecutive open condi-tions occur during the first 3-min-utes of operation, the compressor will be locked out, a diagnostic communicated to ICSTM if applica-ble, and a manual reset will be re-quired to restart the compressor.

6 GERA-SVX01B-EN

High Pressure ControlThe high pressure controls are wired in series between the com-pressor outputs on the RTRM and the compressor contactor coils. If the high pressure control switch opens, the RTRM senses a lack of current while calling for cooling and locks the compressor out.

On dual circuit units, if the high pressure control opens, the com-pressor on the affected circuit is locked out. A manual reset for the affected circuit is required.

(option) Economizer Control Actuator ECA The ECA monitors the mixed-air temperature, return air tempera-ture, minimum position setpoint (local or remote), power exhaust setpoint, CO2 setpoint, CO2 and ambient dry bulb/enthalpy sensor or comparative humidity (return air humidity against ambient hu-midity) sensors, if selected, to con-trol dampers to an accuracy of± 5% of stroke. The actuator is spring returned to the closed posi-tion any time power is lost to the unit. It is capable of delivering up to 25-inch pounds of torque and is powered by 24 VAC.

(option) RTCI-ReliaTel Trane Communication Interface This module is used when the ap-plication calls for an ICS building management type control system. It allows the control and monitor-ing of the system through an ICS panel. The module can be ordered from the factory or ordered as a kit to be field installed. Follow the in-stallation instruction that ships with each kit when field installa-tion is necessary.

(option) RTLI-ReliaTel LonTalk Communication InterfaceThis module is used when the ap-plication calls for either an ICS building management type control system that is LonTalk. It allows the control and monitoring of the system through an ICS panel. The module can be ordered from the factory or ordered as a kit to be field installed. Follow the installa-tion instruction that ships with each kit when field installation is necessary.

(option) RTOM-ReliaTel Options ModuleThe RTOM monitors the supply fan proving, clogged filter, supply air temperature, exhaust fan set-point, supply air tempering, Frost-atTM and smoke detector. Refer to system input devices and func-tions for operation.

(option) Supply Fan FailureInputThe fan failure switch can be facto-ry or field installed to sense indoor fan operation. With the FFS-Fan Failure Switch, if air flow through the unit is not proven by the differ-ential pressure switch (factory set point 0.07-inch w.c.) within 40-sec-onds nominally, the RTRM will shut off all mechanical operations, lock the system out, send a diag-nostic to ICS, and the service LED will flash. The system will remain locked out until a reset is initiated either manually or through ICS.

(option) Clogged Filter SwitchThe unit mounted clogged filter switch monitors the pressure dif-ferential across the return air fil-ters. It is mounted in the filter section and is connected to the

RTOM. A diagnostic service signal is sent to the remote panel if the pressure differential across the fil-ters is at least 0.5-inch w.c. The contacts will automatically open when the pressure differential across the filters decreases to ap-proximately 0.4-inch w.c. The clogged filter output is energized when the supply fan is operating and the clogged filter switch has been closed for at least 2-minutes. The system will continue to oper-ate regardless of the status of the filter switch.

(option) Power Exhaust ControlThe power exhaust fan is started whenever the position of the econ-omizer dampers meets or exceed the power exhaust setpoint when the indoor fan is on. The setpoint panel is located in the return air section, and is factory set to 25%.

(option) Evaporator Frost ControlThis input incorporates the Frostat control (FOS) of each refrigeration circuit and can be activated by closing a field supplied contact in-stalled in parallel with the FOS.

If this circuit is open before the compressor is started, the com-pressor will not be allowed to op-erate. Anytime this circuit is opened for 5-continuous seconds during compressor operation, the compressor for that circuit is im-mediately turned OFF. The com-pressor will not be allowed to restart for a minimum of 3-min-utes should the FOS close.

GeneralInformation

GERA-SVX01B-EN 7

(option) Smoke Detector SensorThis sensor provides high limit shutdown of the unit and requires a manual reset. The sensor is used to detect smoke due to fire in the air conditioning or ventilation ducts.

In order for the supply air smoke detector or return air smoke detec-tor to properly sense smoke in the supply/return air stream, the air velocity entering the smoke detec-tor unit must be between 500 and 4000-feet per minute.

Field installed ONLY Accessories

High Temperature Sensor (BAYFRST002A)This sensor connects the RTRM Emergency Stop Input LTB1-5 and LTB1-6 and provides high limit shutdown of the unit and requires a manual reset. The sensor is used to detect high temperatures due to fire in the air conditioning or venti-lation ducts. The sensor is de-signed to mount directly to the sheet metal duct. Each kit contains two sensors. The return air duct sensor (X13100040010) is set to open at 135-degrees F. The supply air duct sensor (X13100040020) is set to open at 240-degrees F. The control can be reset after the tem-perature has been lowered ap-proximately 25-degrees F below the cutout setpoint.

Electronic Timeclock(BAYCLCK001A)This electronic timeclock is de-signed to control the occupied/un-occupied switching of up to four rooftop units. Once the unit(s) has

entered an unoccupied status, night setback temperatures can be controlled by utilizing a standard zone sensor wired to the RTRM. The timeclock contains four binary outputs (RE1, RE2, RE3, RE4), a liq-uid crystal display (LCD), and four programming keys (Time/Day Key, Occupied/Unoccupied Program Key, Run Key, and an Advance/Override Key). An 18 to 30-VAC power source is required either from one of the units being con-trolled or from a separate class-2 power source.

Zone Panel(BAYSENS006B)This electronic sensor features three system switch settings (EM HEAT, HEAT, COOL, and OFF) and two fan settings (ON and AUTO). It is a manual changeover control with single setpoint capability.

Zone Panel(BAYSENS008B)This electronic sensor features four system switch settings (HEAT, COOL, AUTO, OFF) and two fan settings (ON and AUTO). It is a manual or auto changeover control with dual setpoint capabil-ity. It can be used with a remote zone temperature sensor BAYSENS017B.

Remote Panel w/o NSB(BAYSENS010B)This electronic sensor features four system switch settings (HEAT, COOL, AUTO, and OFF) and two fan settings (ON and AUTO) with four system status LED’s. It is a manual or auto changeover control with dual set-point capability. It can be used with a remote zone temperature

sensor BAYSENS017B.

Programmable Zone Sensor(BAYSENS019B)This 7-day programmable sensor features 2, 3, and 4-periods for Oc-cupied/Unoccupied programming per day. If the power is interrupt-ed, the program is retained in per-manent memory. If power is off longer than 2-hours, only the clock and day may have to be reset.

The zone sensor allows selection of 2, 3, and 4 system modes (HEAT, COOL, AUTO, and OFF), two fan modes (ON and AUTO) It has dual temperature selection with programmable start time ca-pability.

The occupied cooling setpoint ranges between 45 and 98-de-grees F. The heating setpoint rang-es between 43 and 96-degrees F.

A liquid crystal display (LCD) dis-plays zone temperature, tempera-ture set points, day of the week, time, and operational mode sym-bols.

The option menu is used to enable or disable applicable functions, (i.e. morning warm-up, economiz-er minimum position override dur-ing unoccupied status, fahrenheit or centigrade, supply air temper-ing, remote zone temperature sen-sor, 12/24-hour time display, smart fan, and computed recovery.

During an occupied period, an auxiliary relay rated for 1.25-amps at 30-volts AC with one set of sin-gle pole, double throw contacts is activated.

GeneralInformation

8 GERA-SVX01B-EN

Remote Zone Sensor(BAYSENS013C)This electronic sensor features re-mote zone sensing and timed override with override cancella-tion. It is used with a Trane Inte-grated ComfortTM building management system.

Remote Zone Sensor(BAYSENS014C)This electronic sensor features sin-gle setpoint capability and timed override with override cancella-tion. It is used with a Trane Inte-grated ComfortTM building management system.

Remote Zone Sensor(BAYSENS016A)This bullet type temperature sen-sor can be used for outside-air am-bient sensing, return air temperature sensing, supply air

temperature sensing, remote tem-perature sensing (uncovered). Wiring procedures vary according to the particular application and equipment involved. Refer to the unit’s wiring diagrams for proper connections.

Remote Zone Sensor(BAYSENS017B)This electronic sensor can be used with BAYSENS006B, 008B, 010B, 019A, 020A, or 021A remote pan-els. When this sensor is wired to a BAYSENS019A or BAYSENS020A remote panel, wiring must be 18 AWG shielded twisted pair (Belden 8760 or equivalent). Refer to the specific remote panel for wiring details.

Component Location

1 Controls

2 Compressor/water-to-refrigerant section

3 Air-to-refrigerant coil

4 Filter location

5 Blower and motor location

GeneralInformation

GERA-SVX01B-EN 9

DimensionsClearance

10 GERA-SVX01B-EN

DimensionsClearance 036 to 060

GERA-SVX01B-EN 11


12 GERA-SVX01B-EN


GER A B C

150,180 17 1/2" (445)

53 3/4"(1365)

36" (914)

240,300 19 1/2"(495)

64 3/4"(1645)

39"(991)

GERA-SVX01B-EN 13

DimensionsUnit Sizes 036, 048, 060

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DimensionsUnit Sizes 072, 090, 120

Unit Size A B C D E F G

072 40 7/8"(1038)

9"(229)

11 3/4"(298)

11 7/8"(302)

7"(178)

11"(279)

1" NPTI

090 40 7/8"(1038)

9"(229)

14 1/2"(368)

13 3/8"(340)

4 7/8"(124)

9 3/4"(248)

1" NPTI

120 46 7/8"(1190)

8 1/2"216

13 1/4"(337)

13 3/4"(349)

5 1/2"(140)

9 3/8"(238)

1 1/4" NPTI

GERA-SVX01B-EN 15

DimensionsUnit Sizes 150, 180

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DimensionsUnit Sizes 240, 300

GERA-SVX01B-EN 17

DimensionsRoof Curb 036, 048, 060

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DimensionsRoof Curb 072, 090, 120

GERA-SVX01B-EN 19

DimensionsRoof Curb 150, 180

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DimensionsRoof Curb 240, 300

GERA-SVX01B-EN 21

NOTE 1: Net weights for electric heat are as follows

Table 1: Typical unit weights and point loading data

Unit Size Net WeightCorner Weight (lbs) Center of Gravity (in) [mm]

A B C D Length Width

036 442 138 110 88 105 31 [787] 19 [483]

048 474 151 114 95 114 31 [787] 19 [483]

060 492 160 118 97 117 31 [787] 19 [483]

072 772 259 196 136 181 38 [966] 22 [559]

090 794 272 200 137 185 38 [966] 22 [559]

120 941 320 243 162 215 38 [966] 22 [559]

150 1351 465 344 231 311 46 [1168] 29 [737]

180 1489 547 368 231 343 43 [1092] 27 [686]

240 2008 707 510 331 460 51 [1295] 34 [864]

300 1906 661 507 320 418 53 [1346] 33 [838]

Table 2: Option and accessory weights

Option/Accessory Description Net Weight036-060

Net Weight072-120

Net Weight150-180

Net Weight240-300

Electric Heat 15 15 note 1 note 1

Economizer 26 36 65 65

Motorized Damper 20 30 60 60

Manual Damper 16 26 32 32

Barometric Relief 7 10 - -

Power Exhaust N/A 80 95 -

Oversized Motor 5 8 5 5

Belt Drive Motor (3-phase only) 31 Standard 10 10

Hinged Access 10 12 27 27

Hail Guard 12 20 - -

Through the base electrical 8 13 23 23

Unit Disconnect Switch 5 5 10 10

Unit Circuit Breaker 5 5 10 10

TCI, LCI 1 1 1 1

Frostat 1 1 1 1

Crankcase Heater 1 1 1 1

Smoke Detector, Return 7 7 7 7

Smoke Detector, Supply 5 5 5 5

Clogged Filter Switch 1 1 1 1

Fan Fail Switch 1 1 1 1

Discharge Air Tube 3 3 3 3

Roof curb 70 115 235 -

Zone Sensors 1 1 1 1

Unit Size 5-18 kW 23-36 kW 54 kW 72 kWGER 150/180 28/21 31/27 38/32 -GER 240/300 - 33/27 40/32 43/34

Dimensions/Weights

WARNINGHeavy Objects!Do not use cables (chains or slings except as shown. Each of the cables (chains or slings) used to lift the unit must be capa-ble of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length. Adjust as nec-essary for even unit lift. Other lifting ar-rangements may cause equipment or property-only damage. Failure to properly lift unit may result in death or serious in-jury. See details below.

22 GERA-SVX01B-EN

General Installation ChecksThe checklist below is a summary of the steps required to successful-ly install a commercial unit. This checklist is intended to acquaint the installing personnel with what is required in the installation pro-cess. It does not replace the de-tailed instructions called out in the applicable sections of this manual.

1 Check the unit for shipping dam-age and material shortage; file a freight claim and notify appro-priate sales representation.

2 Verify the correct model, options and voltage from the unit name-plate.

3 Verify the installation location of the unit will provide the re-quired clearance for proper op-eration.

4 Assemble and install the roof curb (if applicable). Refer to the latest edition of the curb install-ers guide that ships with each curb kit.

5 Fabricate and install duct work; secure duct work to the curb.

Rigging the unit6 Set the unit onto the curb; check

for levelness.

7 Ensure unit-to-curb seal is tight and without buckles or cracks.

8 Install and connect a condensate drain line to the evaporator drain connection.

Factory Installed Economizer9 Ensure the economizer has been

pulled out into the operating po-sition. Refer to the economizer installers guide for proper posi-tion and setup.

10 Install all access panels.

WARNINGHazardous Voltage!Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

Main Electrical Power Requirements11 Verify the power supply com-

plies with the unit nameplate specifications.

12 Inspect all control panel com-ponents; tighten any loose connections.

13 Connect properly sized and protected power supply wiring to a field-supplied/installed disconnect switch and to the main power terminal block (HTB1) in the unit control pan-el.

14 Install proper grounding wires to an earth ground.

Note: All field-installed wiring must comply with NEC and appli-cable local codes.

Electric Heat Requirements15 Verify that the power supply

complies with the electric heat-er specifications on the unit and heater nameplate.

16 Inspect the heater junction box and control panel; tighten any loose connections.

17 Check electric heat circuits for continuity.

Low Voltage Wiring (AC & DC) Requirements18 Install the zone thermostat,

with or without switching sub-base.

19 Connect properly sized control wiring to the proper termina-tion points between the zone thermostat and the unit control panel.

Filter Installation20 Each unit ships with 1-inch fil-

ters. The quantity of filters is determined by unit size. Access to the filters is obtained by re-moving the fan access panel. To modify the unit’s filter rack to accept 2-inch filters, remove the L-shaped angle attachment screws and rotate the angles 90-degrees.

21 Reinstall the screws and insert new filters. Refer to the unit Service Facts (shipped with each unit) for filter require-ments.

Note: Do not operate the unit with-out filters.

Installation

GERA-SVX01B-EN 23

Foundation for Rooftop UnitsIf the unit is installed at ground level (horizontal design), elevate it above the snow line. Provide con-crete footings at each support lo-cation with a full perimeter support structure or a slab founda-tion for support. Refer to Table 1 on page 21 for the unit’s operating and point loading weights when constructing a footing foundation.

If anchoring is required, anchor the unit to the slab using hold down bolts or isolators. Isolators should be installed to minimize the transmission of vibrations into the building.

For rooftop applications, ensure the roof is strong enough to sup-port the combined unit and sup-port structural weight. Refer to Table 1 for the unit operating weights. If anchoring is required, anchor the unit to the roof with hold-down bolts or isolators.

Check with the contractor for prop-er waterproofing procedures.

DuctworkWhen attaching the ductwork to the unit, provide a watertight flexi-ble connector at the unit to prevent operating sounds from transmit-ting through the ductwork.

Elbows with turning vanes or split-ters are recommended to mini-mize air noise due to turbulence and to reduce static pressure.

All outdoor ductwork between the unit and the structure should be weather proofed after installation is complete. See dimensional data on pages 13 through 16 for con-nection sizes.

Installation

Example 1: Duct connection for 3 to 5-ton horizontal flow

Example 2: Duct connection for 3 to 5-ton down flow

24 GERA-SVX01B-EN

Roof CurbsThe roof curbs for these units (down flow) consists of a full pe-rimeter enclosure to support the unit. Before installing any roof curb:

1 Verify that the correct roof curb is applied to the unit

2 Verify that the roof curb in-cludes the necessary gaskets and hardware.

3 Verify that the proposed in-stallation location provides the required clearance for proper unit operation.

4 Insure that the curb is level and square. The top surface of the curb must be true to assure an adequate curb-to-unit seal.

Step-by-step curb assembly and installation instructions ship with each accessory roof curb kit. Fol-low the instructions carefully to as-sure proper fit-up when the unit is set into place.

To assure proper condensate flow during operation, the unit (and curb) must be level.

If the unit is elevated, a field con-structed catwalk around the unit is strongly recommended to provide easy access for unit maintenance and service.

Recommendations for installing the supply air and return air duct-work joining the roof curb are in-cluded in the curb instruction booklet. See dimensional data on pages 17 through 20 for roof curb sizing.

Note: For sound consideration, cut only the holes in the roof deck for the duct work penetrations. Do not cut out the entire roof deck within the curb perimeter.

If Curb Accessory Kit is not used: • The duct work can be attached directly to the factory provided flang-

es around the unit’s supply and return air openings. Be sure to use flexible duct connections at the unit.

• For built-up curbs supplied by others, gaskets must be installed around the curb perimeter flange and the supply and return air opening flanges.

Installation

Example 3: Roof curb for 3 to 5-ton down flow

GERA-SVX01B-EN 25

Rigging the UnitA rigging illustration and center-of-gravity dimensional data table are shown on page 21. Refer to the typical unit operating weights ta-ble before proceeding.

• Remove the two screws from each end of the unit that se-cures the wooden shipping top. Remove the wooden top and metal retaining brackets. Remove the protective cover-ing from around the unit.

• Rig the unit. Attach adequate strength lifting slings to all four lifting brackets in the unit base rail. Do not use cables, chains, or slings except as shown.

• Install a lifting bar, (as shown in the illustration), to protect the unit, and to facilitate a uni-form lift. The minimum dis-tance between the lifting hook and the top of the unit should be 7-feet.

• Test lift the unit to ensure it is properly rigged and bal-anced. Make any necessary rigging adjustments.

• Lift the unit and position it into place.

• Downflow units; align the base rail of the unit with the curb rail while lowering the unit onto the curb. Make sure that the gasket on the curb is not damaged while positioning the unit.

Rigging Illustration

See Table 1 on page 21 for dimen-sional and weight information

Supply/Return PipeConnect the supply andreturn line to the water inlet and outlet of the unit. On open loop systems, an in-line strainer or mesh screen should be used to eliminate contaminants from en-tering the water-to refrigerant heat exchanger.

An isolation valve, p/t plugs and automatic balancing device are also recommended to separate the closed/open loop from the me-chanical device.

Installation

Example 4: Water connection location

26 GERA-SVX01B-EN

Drain ConnectionAn evaporator condensate drain connection is provided on each unit. The condensate drain pan is factory installed to drain conden-sate to the back side of the unit. It can be converted to drain conden-sate out of the front of the unit or through the base

To convert drain condensate out the front of the unit:

1 Remove the evaporator access panel and supply air access pan-els.

2 Remove the support panel that the condensate drain pan exits through.

3 Slide the condensate drain pan out of the unit and rotate 180°.

4 Slide the condensate drain pan back into the unit, align the drain with the grommeted opening in the rear support pan-el and push until the coupling is seated in the grommet.

5 Replace the front support panel by aligning the panel with tabs in the raceway. Align the con-densate drain pan support in the grommeted hole as the panel is put in place.

6 Replace the evaporator access panel and the supply air access panels.

To convert drain condensate through the base of the unit:

1 Remove the evaporator access panel and supply air access pan-els.

2 Remove the support panel that the condensate drain pan exits through.

3 Slide the condensate drain pan out of the unit.

4 Place on a level surface in the position it was removed from the unit.

5 Remove the plug knockout in the bottom of the drain pan to con-vert it to through the base drain-age.

6 Plug the original condensate drain opening with a field sup-plied 3/4-inch NPT plug.

7 Slide the condensate drain pan back into the unit, align the drain support with the grom-meted opening in the rear sup-port panel and push until the support is seated in the grom-met.

8 Replace the front support panel by aligning the panel with tabs in the raceway. Align the plugged condensate drain pan coupling in the grommeted hole as the panel is put in place.

9 Replace evaporator access panel and supply air access panels.

A condensate trap must be in-stalled at the unit due to the drain connection being on the negative pressure side of the fan. Install the p-trap using the guidelines below.

A condensate drain line must be connected to the p-trap. Pitch the drain lines at least 1/2-inch for ev-ery 10-feet of horizontal run to as-sure proper condensate flow. Do not allow the horizontal run to sag causing a possible double-trap condition which could result in condensate backup due to air lock.

Condensate Trap Installation

Installation

GERA-SVX01B-EN 27

Horizontal Discharge ConversionUnits are factory shipped in the downflow discharge configura-tion, but can be field converted to a horizontal discharge configura-tion. Some, but not all units re-quire a different thermal cut-out limit switch (which is wire tied near the terminal block in the heat-er compartment) if the horizontal discharge configuration is used.

The following units require a limit switch change out for the horizon-tal discharge. The additional limit switch is shipped attached to the blower housing. Proceed to TCO-A instructions on page 28 for the model/heater combination.

If any of the units listed in the pre-ceding list are installed in the downflow discharge configura-tion, remove the wire tied TCO-A (located near the terminal block in the heater compartment) and dis-card.

Conversion3 through 5-Ton UnitsTo convert a unit from down flow to horizontal discharge,

1 Remove the return and supply duct covers.

2 Apply gasket to the supply duct cover as shown in Figure 3.

Unit Model No. Electric HeaterGERA0724_A0 BAYHTRS427A

GERA0904_A0 BAYHTRS436A

GERA0725_A0 BAYHTRSW27

GERA0905_A0 BAYHTRSW36

GERA1204_A0 BAYHTRT454A

GERA1205_A0 BAYHTRTW54A

Figure 3: Gasket Installation

3 Position duct covers. Rotate the supply duct cover 90-degrees to allow it to be slid into the supply opening.

Note: If the unit is equipped with a return air smoke detector, refer to the field conversion for hori-zontal discharge before in-stalling the return air duct cover.

4 Slide the duct covers into the duct openings until endward edge of the duct cover engag-es with the two re-taining clips on the duct flanges. Secure the out-ward edge of each duct cover with two screws.

If unit should include a limit switch change out, proceed to the TCO-A instruction sheet on page 28.

Conversion6 through 10-Ton Units

To convert a unit from down flow to horizontal discharge,

1 Remove the return and supply duct covers.

2 Apply gasket to the return duct cover as shown in Figure 3.

3 Position the duct covers as shown below. The supply duct

cover is installed over the down flow return open-ing by engaging one side of the panel under a re-taining angle and securing the other side with three screws.

Note: If the unit is equipped with a return air smoke detector, refer to the field conversion for horizontal discharge before installing the re-turn air duct cover.

Installation

28 GERA-SVX01B-EN

4 Slide return duct cover into sup-ply openings until endward edge of the duct cover engages with the two retaining clips on the duct flanges. Secure the out-ward edge of each duct cover with two screws.

If unit should include a limit switch change out, proceed to the TCO-A instruction sheet on this page.

2 TCO-A is the limit control locat-ed in the central part of the heat-er mounting plate and that is located on the bottom of the two heater element assemblies. To replace this device, first remove the two wires connected to the terminals. Next, remove the two screws which secure it to the heater element mounting plate. Once TCO-A has been removed from the heater element mount-ing plate, discard this device.

3 Obtain the replacement TCO-A which is secured by a wire tie near the electric heater terminal block in the heater compart-ment. Attach it to the heater ele-ment mounting plate with the two screws that were removed in step 2 above. Connect the two wires that were unhooked in step 2 to the terminals on the new TCO-A. Refer to the heater package wiring diagram to as-sure that the wiring is connected properly.

4 Close the electric heater dead front panel and replace heat sec-tion access panel.

TCO-A InstructionsIf the unit being installed is listed in the following table, and is equipped with the corresponding model number of factory installed electric heater package in the ta-ble, the limit control TCO-A must be replace with the extra limit con-trol shipped in the heater compart-ment. Replace TCO-A following the instruction in steps 1 through 4. If the unit being installed does not have a factory installed electric heater package, or is equipped with a factory installed electric heater model that does not corre-spond to models listed below, skip steps 1 through 4, and go on to the next step in the installation pro-cess.

Note: See page 35 (Table E4) for electric heater kit part #s and equipment models.

1 Remove the heater section ac-cess panel and open the electric heater front panel.

Installation

GERA-SVX01B-EN 29

Field Installed Power WiringPower wiring to the rooftop equip-ment must conform to National and Local Electric Codes (NEC) by a professional electrician.

Verify that the power supply avail-able is compatible with the unit’s nameplate. The available supply power must be within 10% of the rated voltage stamped on the nameplate. Use only copper con-ductors to connect the power sup-ply to the unit.

WARNINGLive Electrical Components!During installation, testing, ser-vicing and troubleshooting of this product, it may be necessary to work with live electrical compo-nents. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical compo-nents perform these tasks. Failure to follow all electrical safety pre-cautions when exposed to live electrical components could re-sult in death or serious injury.

Main Unit Power Wiring1 If the unit is NOT equipped with

an optional factory installed non-fused disconnect switch or circuit breaker, a field supplied disconnect switch must be in-stalled at or near the unit in ac-cordance with the National Electric Code (NEC latest edi-tion).

2 Location of the applicable elec-tric service entrance may be found in Figure 4.

3 Complete the unit’s power wir-ing connections onto either; the main terminal wire connectors inside the unit control panel, the factory mounted non-fused dis-connect switch (UCD) or circuit breaker (UCB). Refer to the cus-tomer connection diagram that is shipped with the unit for spe-cific termination points.

4 Provide proper grounding for the unit in accordance with the local and national codes.

Field Installed Control WiringAn overall layout of the various control options available with the required number of conductors foreach control device may be found on page 32.

Note: All field wiring must con-form to NEC guidelines as well as state and local codes.

Control Power TransformerThe 24-volt control power trans-formers are to be used only with the accessories called out in this manual. Transformers rated great-er than 50 VA are equipped with internal circuit breakers. If a circuit breaker trips, turn OFF all power to the unit before attempting to reset it.

WARNINGHazardous

Voltage!Disconnect all electric power, in-cluding remote disconnects be-fore servicing. Follow proper lockout/tagout procedures to en-sure the power can not be inad-vertently energized. Failure to disconnect power before servic-

ing could result in death or se-rious injury.

The transformer is located in the control panel. The cir-

cuit breaker is located on the left side of the transformer and can

be reset by pressing in on the black reset button.

Installation

a

Figure 4: Electric entrance

30 GERA-SVX01B-EN

Installation

GERA-SVX01B-EN 31

Installation

32 GERA-SVX01B-EN

Controls Using 24 VAC Before installing any wire, refer to the electrical access locations in Figure 4, page 29.

1 Use copper conductors unless otherwise specified.

2 Ensure that the AC control wir-ing between the controls and the unit’s termination point does not exceed three (3) ohms/conductor for the length of the run.

Note: Resistance in excess of 3-ohms per conductor may cause component failure due to insuffi-cient AC voltage supply.

3 Check all loads and conductors for grounds, shorts, and mis-wiring.

4 Do not run the AC low voltage wiring in the same conduit with the high voltage power wiring.

5 Route low voltage wire per illus-tration Figure 5.

Controls using DC Analog Input/Outputs (Standard Low Voltage Multi-conductor Wire)Before installing any connecting wire between the unit utilizing a DC analog input/output signal, refer to Figure 4, page 29 for elec-trical access locations provided on the unit.

Table 3: 24V AC conductors

Distance from unit to Control

Recommended Wire Size

000-460 feet 18 gauge



1 Review Table 4, it lists the con-ductor sizing guidelines that must be followed when inter-connecting the DC binary out-put devices and the system components utilizing a DC ana-log input/output signal to the unit.

Note: Resistance in excess of 2.5 ohms per conductor can cause de-viations in the accuracy of the con-trols.

2 Ensure that the wiring between controls and the unit’s termina-tion point does not exceed two and a half (2.5) ohms/conductor for the length of the run.

3 Do not run the electrical wires transporting DC signals in or around conduit housing high voltage wires.

4 Route low voltage wiring per Figure 5.

ReliaTel Conventional Thermostat Field Wiring Diagram

Table 4: DC conductors; Zone Sensor Module Wiring

Distance from unit to Control

Recommended Wire Size

0-150 feet 22 gauge





Installation

Figure 5: Wire routing

GERA-SVX01B-EN 33

Return Air Smoke Detector The factory installed return air smoke detector is installed in the downflow discharge position. No additional field set-up is required.

If the unit is to converted to a hori-zontal discharge, the following conversion steps must be per-formed:

1 If the unit has an economizer, it must be pulled out in the oper-ating position.

2 Remove the three screws from the mounting brackets. Refer to downflow view for screw loca-tions in Figure 6.

3 Lift the tube and bracket from the downflow duct opening. Rotate the tube and bracket as-sembly 180º ensuring that the holes on the copper sensing tube face away from the unit and face the return air duct-work. Refer to the horizontal view in Figure 6.

Note: Check to ensure that the flex-ible tubing lies flat on the base pan surface.

4 Slide the top bracket down the copper sensing tube, insert the tab on the left side into the slot on the indoor coil blockoff and secure the right side of the bracket with one of the three screws removed in step b. Refer to the horizontal view in Figure 6.

5 Using the remaining two screws removed in step b, secure the bottom bracket. Refer to hori-zontal view in Figure 6.

Installation

Figure 6: Screw locations

34 GERA-SVX01B-EN

Electrical Requirements

Table E-1: Electrical performance for standard blower motor

Table E-2: Electrical performance for high static blower motor

Model No. Volts Total FLA

Comp.RLA

ComprMCC

Comp.LRA

No. ofCompres.

BlowerMotorFLA

BlowerMotor

HP

BlowerMotor

No.

Min.Circ.

Ampacity

OvercurrentProtective Device

(AMPS)GERA0361 208/60/1 19.8 17.5 24.2 104.0 1 2.3 0.33 1 24.2 40GERA0362 230/60/1 19.8 17.5 24.2 104.0 1 2.3 0.33 1 24.2 40GERA0363 208/60/3 14.1 11.8 14.2 74.0 1 2.3 0.33 1 17.1 25GERA0368 230/60/3 14.1 11.8 14.2 74.0 1 2.3 0.33 1 17.1 25GERA0364 460/60/3 7.4 6.3 7.5 37.6 1 1.1 0.33 1 9.0 15GERA0365 575/60/3 6.3 5.2 5.5 30.4 1 1.1 0.33 1 7.6 15GERA0481 208/60/1 30.5 26.9 34 131.0 1 3.6 0.6 1 37.2 60GERA0482 230/60/1 30.5 26.9 34 131.0 1 3.6 0.6 1 37.2 60GERA0483 208/60/3 18.2 14.6 20 91.0 1 3.6 0.6 1 21.9 35GERA0488 230/60/3 18.2 14.6 20 91.0 1 3.6 0.6 1 21.9 35GERA0484 460/60/3 9.0 7.3 10 46.0 1 1.7 0.6 1 10.8 15GERA0485 575/60/3 7.5 6 8 37.0 1 1.5 0.6 1 9.0 15GERA0601 208/60/1 38.2 32.0 42.2 144.0 1 6.2 0.9 1 46.2 60GERA0602 230/60/1 38.2 32.0 42.2 144.0 1 6.2 0.9 1 46.2 60GERA0603 208/60/3 25.3 19.1 29.0 128.0 1 6.2 0.9 1 30.1 45GERA0608 230/60/3 25.3 19.1 29.0 128.0 1 6.2 0.9 1 30.1 45GERA0604 460/60/3 12.8 9.9 12.4 63.0 1 2.9 0.9 1 15.3 25GERA0605 575/60/3 10.0 7.9 10.3 49.0 1 2.1 0.9 1 12.0 20GERA0723 208/60/3 23.6 18.6 29.0 156.0 1 5 1 1 28.3 45GERA0728 230/60/3 23.6 18.6 29.0 156.0 1 5 1 1 28.3 45GERA0724 460/60/3 11.8 9.3 14.0 75.0 1 2.5 1 1 14.1 20GERA0725 575/60/3 9.1 7.4 11.5 54.0 1 1.7 1 1 11.0 15GERA0903 208/60/3 31.0 26.0 40.5 172.0 1 5 1 1 37.5 60GERA0908 230/60/3 31.0 26.0 40.5 172.0 1 5 1 1 37.5 60GERA0904 460/60/3 16.0 13.5 17.2 90.0 1 2.5 1 1 19.4 30GERA0905 575/60/3 12.6 10.9 13.9 62.3 1 1.7 1 1 15.3 25GERA1203 208/60/3 40.9 17.3 27.0 123.0 2 6.3 2 1 45.2 70GERA1208 230/60/3 40.9 17.3 27.0 123.0 2 6.3 2 1 45.2 70GERA1204 460/60/3 21.1 9.0 14.0 62.0 2 3.1 2 1 23.4 30GERA1205 575/60/3 16.7 7.1 11.0 50.0 2 2.5 2 1 18.5 25GERA1503 208/60/3 54.0 21.7 29.0 156.0 2 10.6 3 1 59.4 80GERA1508 230/60/3 54.0 21.7 29.0 156.0 2 10.6 3 1 59.4 80GERA1504 460/60/3 24.8 10.0 14.0 75.0 2 4.8 3 1 27.3 35GERA1505 575/60/3 20.3 8.2 11.5 54.0 2 3.9 3 1 22.4 30GERA1803 208/60/3 61.1 30.1/20.4 47.0/29.0 225/156 2 10.6 3 1 68.6 90GERA1808 230/60/3 61.1 30.1/20.4 47.0/29.0 225/156 2 10.6 3 1 68.6 90GERA1804 460/60/3 31.2 15.6/10.8 24.2/14.0 114/75 2 4.8 3 1 35.1 50GERA1805 575/60/3 24.5 12.1/8.5 18.9/11.5 80/54 2 3.9 3 1 27.5 35GERA2403 208/60/3 85.1 34.2 27.0 225.0 2 16.7 5 1 93.7 125GERA2408 230/60/3 85.1 34.2 27.0 225.0 2 16.7 5 1 93.7 125GERA2404 460/60/3 42.2 17.3 14.0 114.0 2 7.6 5 1 46.5 60GERA2405 575/60/3 33.1 13.5 11.0 80.0 2 6.1 5 1 36.5 50GERA3003 208/60/3 103.2 42.8 52.5 253.0 2 17.6 7.5 1 113.9 150GERA3008 230/60/3 103.2 42.8 52.5 253.0 2 17.6 7.5 1 113.9 150GERA3004 460/60/3 44.0 17.7 23.3 118.0 2 8.6 7.5 1 48.4 60GERA3005 575/60/3 35.4 14.2 19.0 97.0 2 7.0 7.5 1 39.0 50


Comp.RLA

ComprMCC

Comp.LRA

No. ofCompres.

BlowerMotorFLA

BlowerMotor

HP

BlowerMotor

No.

Min.Circ.

Ampacity


(AMPS)GERA0361 208/60/1 22.2 17.5 24.2 104.0 1 4.7 0.5 1 26.6 40GERA0362 230/60/1 22.2 17.5 24.2 104.0 1 4.7 0.5 1 26.6 40GERA0363 208/60/3 16.5 11.8 14.2 74.0 1 4.7 0.5 1 19.5 30GERA0368 230/60/3 16.5 11.8 14.2 74.0 1 4.7 0.5 1 19.5 30GERA0364 460/60/3 8.6 6.3 7.5 37.6 1 2.3 0.5 1 10.2 15GERA0365 575/60/3 6.9 5.2 5.5 30.4 1 1.7 0.5 1 8.2 15GERA0481 208/60/1 32.6 26.9 34 131.0 1 5.7 0.8 1 39.3 60GERA0482 230/60/1 32.6 26.9 34 131.0 1 5.7 0.8 1 39.3 60GERA0483 208/60/3 20.3 14.6 20 91.0 1 5.7 0.8 1 24.0 35GERA0488 230/60/3 20.3 14.6 20 91.0 1 5.7 0.8 1 24.0 35GERA0484 460/60/3 10.6 7.3 10 46.0 1 3.3 0.8 1 12.4 15GERA0485 575/60/3 8.3 6.0 8 37.0 1 2.3 0.8 1 9.8 15GERA0601 208/60/1 39.9 32.0 42.2 144.0 1 7.9 1 1 47.9 60GERA0602 230/60/1 39.9 32.0 42.2 144.0 1 7.9 1 1 47.9 60GERA0603 208/60/3 27.0 19.1 29.0 128.0 1 7.9 1 1 31.8 50

GERA-SVX01B-EN 35


Table E-2: Electrical performance for high static blower motor (continued)

Table E-3: Electrical performance for belt drive blower motor

Table E-4: Electrical performance for units with electric heat


Comp.RLA

ComprMCC

Comp.LRA

No. ofCompres.

BlowerMotorFLA

BlowerMotor

HP

BlowerMotor

No.

Min.Circ.

Ampacity


(AMPS)GERA0608 230/60/3 27.0 19.1 29.0 128.0 1 7.9 1 1 31.8 50GERA0604 460/60/3 13.1 9.9 12.4 63.0 1 3.2 1 1 15.6 25GERA0605 575/60/3 10.6 7.9 10.3 49.0 1 2.7 1 1 12.6 20GERA0723 208/60/3 24.9 18.6 29.0 156.0 1 6.3 2 1 29.6 45GERA0728 230/60/3 24.9 18.6 29.0 156.0 1 6.3 2 1 29.6 45GERA0724 460/60/3 12.4 9.3 14.0 75.0 1 3.1 2 1 14.7 20GERA0725 575/60/3 9.9 7.4 11.5 54.0 1 2.5 2 1 11.8 15GERA0903 208/60/3 35.4 26.0 40.5 172.0 1 9.4 3 1 41.9 60GERA0908 230/60/3 35.4 26.0 40.5 172.0 1 9.4 3 1 41.9 60GERA0904 460/60/3 18.1 13.5 17.2 90.0 1 4.6 3 1 21.5 35GERA0905 575/60/3 14.6 10.9 13.9 62.3 1 3.7 3 1 17.3 25GERA1203 208/60/3 48.0 17.3 27.0 123.0 2 13.4 5 1 52.3 70GERA1208 230/60/3 48.0 17.3 27.0 123.0 2 13.4 5 1 52.3 70GERA1204 460/60/3 24.6 9.0 14.0 62.0 2 6.6 5 1 26.9 35GERA1205 575/60/3 19.6 7.1 11.0 50.0 2 5.4 5 1 21.4 25GERA1503 208/60/3 60.1 21.7 29.0 156.0 2 16.7 5 1 65.5 80GERA1508 230/60/3 60.1 21.7 29.0 156.0 2 16.7 5 1 65.5 80GERA1504 460/60/3 27.6 10.0 14.0 75.0 2 7.6 5 1 30.1 40GERA1505 575/60/3 22.5 8.2 11.5 54.0 2 6.1 5 1 24.6 30GERA1803 208/60/3 67.2 30.1/20.4 47.0/29.0 225/156 2 16.7 5 1 74.7 100GERA1808 230/60/3 67.2 30.1/20.4 47.0/29.0 225/156 2 16.7 5 1 74.7 100GERA1804 460/60/3 34.0 15.6/10.8 24.2/14.0 114/75 2 7.6 5 1 37.9 50GERA1805 575/60/3 26.7 12.1/8.5 18.9/11.5 80/54 2 6.1 5 1 29.7 40GERA2403 208/60/3 86.0 34.2 27.0 225.0 2 17.6 7.5 1 94.6 125GERA2408 230/60/3 86.0 34.2 27.0 225.0 2 17.6 7.5 1 94.6 125GERA2404 460/60/3 86.0 17.3 14.0 114.0 2 8.6 7.5 1 47.5 60GERA2405 575/60/3 86.0 13.5 11.0 80.0 2 7.0 7.5 1 37.4 50


Comp.RLA

ComprMCC

Comp.LRA

No. ofCompres.

BlowerMotorFLA

BlowerMotor

HP

BlowerMotor

No.

Min.Circ.

Ampacity


(AMPS)GERA0363 208/60/3 16.8 11.8 14.2 74.0 1 5.0 1 1 19.8 30GERA0368 230/60/3 16.8 11.8 14.2 74.0 1 5.0 1 1 19.8 30GERA0364 460/60/3 8.8 6.3 7.5 37.6 1 2.5 1 1 10.4 15GERA0365 575/60/3 6.9 5.2 5.5 30.4 1 1.7 1 1 8.2 15GERA0483 208/60/3 19.6 14.6 20 91.0 1 5.0 1 1 23.3 35GERA0488 230/60/3 19.6 14.6 20 91.0 1 5.0 1 1 23.3 35GERA0484 460/60/3 9.8 7.3 10 46.0 1 2.5 1 1 11.6 15GERA0485 575/60/3 7.7 6.0 8 37.0 1 1.7 1 1 9.2 15GERA0603 208/60/3 24.1 19.1 29 128.0 1 5.0 1 1 28.9 45GERA0608 230/60/3 24.1 19.1 29 128.0 1 5.0 1 1 28.9 45GERA0604 460/60/3 12.4 9.9 12.4 63.0 1 2.5 1 1 14.9 25GERA0605 575/60/3 9.6 7.9 10.3 49.0 1 1.7 1 1 11.6 20

Unit Size Electric Heat Kit ElectricHeater

FLA

ElectricHeater

KW

ControlStages

Standard Blower MotorMCA

MFS High Static

Blower MotorMCA

MFS Belt Drive

Blower MotorMCA

MFS

208 Volts Single PhaseBAYHTRR105A 18.3 3.8 1 47.0 50 49.4 60 NA NA

GERA0361 BAYHTRR110A 36.1 7.5 2 69.2 70 71.6 80 NA NABAYHTRR114A 50.0 10.4 2 86.7 90 89.1 90 NA NABAYHTRR105A 18.3 3.8 1 60.1 80 62.2 80 NA NA

GERA0481 BAYHTRR110A 36.1 7.5 2 82.3 100 84.4 100 NA NABAYHTRR114A 50.0 10.4 2 99.7 110 101.8 110 NA NABAYHTRR118A 63.5 13.2 2 116.6 125 118.7 125 NA NABAYHTRR105A 18.3 3.8 1 69.0 90 70.7 90 NA NA

GERA0601 BAYHTRR110A 36.1 7.5 2 91.3 110 93.0 110 NA NABAYHTRR114A 50.0 10.4 2 108.7 125 110.4 125 NA NABAYHTRR118A 63.5 13.2 2 125.5 150 127.2 150 NA NA

36 GERA-SVX01B-EN


Table E-4: Electrical performance for units with electric heat (continued)Unit Size Electric Heat Kit Electric

HeaterFLA

ElectricHeater

KW

ControlStages


MFS High Static

Blower MotorMCA

MFS Belt Drive

Blower MotorMCA

MFS

240 Volts Single PhaseBAYHTRR105A 20.8 5 1 50.2 60 52.6 60 NA NA

GERA0362 BAYHTRR110A 41.7 10 2 76.3 80 78.7 80 NA NABAYHTRR114A 57.5 13.8 2 96.1 100 98.5 100 NA NABAYHTRR105A 20.8 5 1 63.3 80 65.4 80 NA NA

GERA0482 BAYHTRR110A 41.7 10 2 89.3 100 91.4 100 NA NABAYHTRR114A 57.5 13.8 2 109.1 110 111.2 125 NA NABAYHTRR118A 73.3 17.6 2 128.9 150 131.0 150 NA NABAYHTRR105A 20.8 5 1 72.2 90 73.9 100 NA NA

GERA0602 BAYHTRR110A 41.7 10 2 98.3 110 100.0 110 NA NABAYHTRR114A 57.5 13.8 2 118.1 125 119.8 125 NA NABAYHTRR118A 73.3 17.6 2 137.9 150 139.6 150 NA NA

208 Volts Three PhaseGERA0363 BAYHTRR306A 12.5 4.5 1 32.7 40 35.1 40 35.4 40

BAYHTRR312A 25.0 9 2 48.3 50 50.7 60 51.0 60BAYHTRR318A 36.4 13.1 2 62.5 70 64.9 70 65.2 70

GERA0483 BAYHTRR306A 12.5 4.5 1 37.5 45 39.6 50 38.9 50BAYHTRR312A 25.0 9 2 53.1 60 55.2 60 54.5 60BAYHTRR318A 36.4 13.1 2 67.3 70 69.4 70 68.7 70

GERA0603 BAYHTRR306A 12.5 4.5 1 45.7 60 47.4 60 44.5 60BAYHTRR312A 25.0 9 2 61.3 70 63.0 70 60.1 70BAYHTRR318A 36.4 13.1 2 75.5 80 77.2 80 74.3 80BAYHTRR323A 48.0 17.3 2 90.1 100 91.8 100 88.9 90

GERA0723 BAYHTRS309A 18.9 6.8 1 51.8 60 53.1 60 - -BAYHTRS318A 37.5 13.5 1 75.1 80 76.4 80 - -BAYHTRS327A 56.3 20.3 2 98.7 100 100.0 100 - -BAYHTRS336A 74.9 27 2 121.9 125 123.2 125 - -

GERA0903 BAYHTRS309A 18.9 6.8 1 61.1 80 65.5 80 - -BAYHTRS318A 37.5 13.5 1 84.3 100 88.7 100 - -BAYHTRS327A 56.3 20.3 2 107.9 110 112.3 125 - -BAYHTRS336A 74.9 27 2 131.2 150 135.6 150 - -

GERA1203 BAYHTRT318A 37.5 13.5 1 92.1 100 99.2 100 - -BAYHTRT327A 56.3 20.3 2 115.7 125 122.8 125 - -BAYHTRT336A 74.9 27 2 138.9 150 146.0 150 - -BAYHTRT354A 112.7 40.6 2 186.1 200 193.2 200 - -

GERA1503 AY*HTRF318A 37.5 13.5 1 113 125 119 125 - -AY*HTRF336A 74.9 27 2 160 175 166 175 - -AY*HTRF354A 112.4 40.5 2 207 225 213 225 - -

GERA1803 AY*HTRF318A 37.5 13.5 1 115.5 125 121.6 125 - -AY*HTRF336A 74.9 27 2 162.3 175 168.4 175 - -AY*HTRF354A 112.4 40.5 2 209.1 225 215.2 225 - -

GERA2403 AY*HTRH336A 74.9 27.0 2 187.3 200 188.2 200 - -AY*HTRH354A 112.4 40.5 2 234.2 250 235.1 250 - -AY*HTRH372A 149.9 54 2 281.0 300 281.9 300 - -

GERA3003 AY*HTRF336A 74.9 27 2 115.7 150 - - - -AY*HTRF354A 112.4 40.5 2 162.5 175 - - - -AY*HTRF372A 149.9 54 2 209.4 225 - - - -

240 Volts Three PhaseGERA0368 BAYHTRR306A 14.4 6 1 35.1 40 37.5 40 37.8 45


GERA0488 BAYHTRR306A 14.4 6 1 39.9 50 42.0 50 41.3 50BAYHTRR312A 28.9 12 2 57.9 60 60.0 70 59.3 60BAYHTRR318A 41.9 17.4 2 74.2 80 76.3 80 75.6 80

GERA0608 BAYHTRR306A 14.4 6 1 48.1 60 49.8 60 46.9 60BAYHTRR312A 28.9 12 2 66.2 70 67.9 70 65.0 70BAYHTRR318A 41.9 17.4 2 82.4 90 84.1 90 81.2 90BAYHTRR323A 55.3 23 2 99.2 100 100.9 110 98.0 100

GERA0728 BAYHTRS309A 21.7 9 1 55.3 60 56.6 60 NA NABAYHTRS318A 43.3 18 1 82.4 90 83.7 90 NA NABAYHTRS327A 65.0 27 2 109.4 110 110.7 125 NA NABAYHTRS336A 86.6 36 2 136.5 150 137.8 150 NA NA

GERA-SVX01B-EN 37

Table E-4: Electrical performance for units with electric heat (continued)Unit Size Electric Heat Kit Electric

HeaterFLA

ElectricHeater

KW

ControlStages


MFS High Static

Blower MotorMCA

MFS Belt Drive

Blower MotorMCA

MFS

240 Volts Three PhaseGERA0908 BAYHTRS309A 21.7 9 1 64.6 80 69.0 80 NA NA

BAYHTRS318A 43.3 18 1 91.6 100 96.0 110 NA NABAYHTRS327A 65.0 27 2 118.7 125 123.1 125 NA NABAYHTRS336A 86.6 36 2 145.8 150 150.2 175 NA NA

GERA1208 BAYHTRT318A 43.3 18 1 99.4 100 106.5 110 NA NABAYHTRT327A 65.0 27 2 126.4 150 133.5 150 NA NABAYHTRT336A 86.6 36 2 153.5 175 160.6 175 NA NABAYHTRT354A 129.9 54 2 175.1 200 182.2 200 NA NA

GERA1508 AY*HTRF318A 43.3 18.0 1 120 125 127 150 - -AY*HTRF336A 86.6 36.0 2 175 175 181 200 - -AY*HTRF354A 129.9 54.0 2 229 250 235 250 - -

GERA1808 AY*HTRF318A 43.3 18.0 1 125.3 150 131.4 150 - -AY*HTRF336A 86.6 36 2 179.4 200 185.5 200 - -AY*HTRF354A 129.9 54 2 233.5 250 239.6 250 - -

GERA2408 AY*HTRH336A 86.6 36 2 201.9 225 202.8 225 - -AY*HTRH354A 129.9 54 2 256.0 275 256.9 275 - -AY*HTRH372A 173.2 72 2 310.2 350 311.1 350 - -

GERA3008 AY*HTRF336A 86.6 36 2 130.3 150 - - - -AY*HTRF354A 129.9 54 2 184.4 200 - - - -AY*HTRF372A 173.2 72 2 238.5 250 - - - -

460 Volts Three PhaseGERA0364 BAYHTRR406A 7.2 6 1 18.0 20 19.2 20 19.4 20


GERA0484 BAYHTRR406A 7.2 6 1 19.8 25 21.4 25 20.6 25BAYHTRR412A 14.4 12 2 28.9 30 30.5 35 29.7 30BAYHTRR418A 20.9 17.4 2 37.0 40 38.6 40 37.8 40

GERA0604 BAYHTRR406A 7.2 6 1 24.3 30 24.6 30 23.9 30BAYHTRR412A 14.4 12 2 33.3 35 33.6 35 32.9 35BAYHTRR418A 20.9 17.4 2 41.4 45 41.7 45 41.0 45BAYHTRR423A 27.7 23 2 49.9 50 50.2 60 49.5 50

GERA0724 BAYHTRS409A 10.8 9 1 27.7 30 28.3 30 - -BAYHTRS418A 21.7 18 1 41.2 45 41.8 45 - -BAYHTRS427A 32.5 27 2 54.7 60 55.3 60 - -BAYHTRS436A 43.3 36 2 68.3 70 68.9 70 - -

GERA0904 BAYHTRS409A 10.8 9 1 32.9 40 35.0 45 - -BAYHTRS418A 21.7 18 1 46.4 50 48.5 50 - -BAYHTRS427A 32.5 27 2 60.0 60 62.1 70 - -BAYHTRS436A 43.3 36 2 73.5 80 75.6 80 - -

GERA1204 BAYHTRT418A 21.7 18 1 50.4 60 53.9 60 - -BAYHTRT427A 32.5 27 2 63.9 70 67.4 70 - -BAYHTRT436A 43.3 36 2 77.5 80 81.0 90 - -BAYHTRT454A 65.0 54 2 88.3 90 91.8 100 - -

GERA1504 AY*HTRD418A 21.7 18.0 1 58 60 61 70 - -AY*HTR*436A 43.3 36 2 85 90 88 90 - -AY*HTR*454A 65.0 54 2 112 125 115 125 - -

GERA1804 AY*HTRD418A 21.7 18 1 59.3 60 62.1 70 - -AY*HTRE436A 43.3 36 2 86.4 90 89.2 90 - -AY*HTRE454A 65.0 54 2 113.4 125 116.2 125 - -

GERA2404 AY*HTRD436A 43.3 36 2 100.7 110 101.7 110 - -AY*HTRE454A 65.0 54 2 127.7 150 128.7 150 - -AY*HTRE472A 86.6 72 2 154.8 175 155.8 175 - -

GERA3004 AY*HTRG436A 43.3 36 2 100.7 110 - - - -AY*HTRG454A 65.0 54 2 127.7 150 - - - -AY*HTRG472A 86.6 72 2 119.0 125 - - - -


38 GERA-SVX01B-EN


Table E-4: Electrical performance for units with electric heat (continued)

*Indicates both downflow and horizontal units.Note:1) Heater kW ratings are at 600V for 575V unit.2) HACR type circuit breaker per NEC.

Unit Size Electric Heat Kit ElectricHeater

FLA

ElectricHeater

KW

ControlStages


MFS High Static

Blower MotorMCA

MFS Belt Drive

Blower MotorMCA

MFS

575 Volts Three PhaseGERA0365 BAYHTRRW06A 5.8 6 1 14.8 15 15.4 20 15.4 20

BAYHTRRW12A 11.5 12 2 22.0 25 22.6 25 22.6 25BAYHTRRW18A 16.7 17.4 2 28.5 30 29.1 30 29.1 30

GERA0485 BAYHTRRW06A 5.8 6 1 16.2 20 17.0 20 16.4 20BAYHTRRW12A 11.5 12 2 23.4 25 24.2 25 23.6 25BAYHTRRW18A 16.7 17.4 2 29.9 30 30.7 35 30.1 35

GERA0605 BAYHTRRW06A 5.8 6 1 19.2 25 19.8 25 18.8 25BAYHTRRW12A 11.5 12 2 26.4 30 27.0 30 26.0 30BAYHTRRW18A 16.7 17.4 2 32.9 35 33.5 35 32.5 35BAYHTRRW23A 22.1 23 2 39.6 40 40.2 45 39.2 40

GERA0725 BAYHTRSW09A 8.7 9 1 21.8 25 22.6 25 - -BAYHTRSW18A 17.3 18 1 32.6 35 33.4 35 - -BAYHTRSW27A 26.0 27 2 43.4 45 44.2 45 - -BAYHTRSW36A 34.6 36 2 54.3 60 55.1 60 - -

GERA0905 BAYHTRSW09A 8.7 9 1 26.2 30 28.2 35 - -BAYHTRSW18A 17.3 18 1 37.0 40 39.0 45 - -BAYHTRSW27A 26.0 27 2 47.8 50 49.8 50 - -BAYHTRSW36A 34.6 36 2 58.6 60 60.6 70 - -

GERA1205 BAYHTRTW18A 17.3 18 1 40.1 45 43.0 45 - -BAYHTRTW27A 26.0 27 2 51.0 60 53.9 60 - -BAYHTRTW36A 34.6 36 2 61.8 70 64.7 70 - -BAYHTRTW54A 52.0 54 2 70.4 80 73.3 80 - -

GERA1505 AY*HTR*W18A 17.3 18 1 44.0 45 46.2 50 - -AY*HTREW36A 34.6 36 2 65.7 70 67.9 70 - -AY*HTREW54A 52.0 54 2 87.3 90 89.5 90 - -

GERA1805 AY*HTR*W18A 17.3 18 1 49.2 50 51.4 60 - -AY*HTREW36A 34.6 36 2 70.8 80 73.0 80 - -AY*HTREW54A 52.0 54 2 92.5 100 94.7 100 - -

GERA2405 AY*HTRFW36A 34.6 36 2 79.8 80 80.7 90 - -AY*HTRGW54A 52.0 54 2 101.4 110 102.3 110 - -AY*HTRHW72A 69.3 72 2 123.1 125 124.0 125 - -

GERA3005 AY*HTRFW36A 34.6 36 2 52.1 60 - - - -AY*HTRGW54A 52.0 54 2 73.7 80 - - - -AY*HTRHW72A 69.3 72 2 95.4 100 - - - -

GERA-SVX01B-EN 39

Space Temperature AveragingSpace temperature averaging is accomplished by wiring a number of remote sensors in a series/par-allel circuit.

Using the BAYSENS016* or BAYSENS017*, at least four sen-sors are required to accomplish space temperature averaging.

Example #1 illustrates two series circuits with two sensors in each circuit wired in parallel. The square of any number of remote sensors require.

Example #2 illustrates three sen-sors squared in a series/parallel circuit. Using BAYSENS032*, two sensors are required to accom-plish space temperature averag-ing.

Example #3 illustrates the circuit required for this sensor.

Table 5 lists the temperature ver-sus resistance coefficient for all sensors.

Table 5: Temperature vs. Resistance

Degrees F

Nominal ResistanceK-Ohms

-20 170.1

-15 143.5

-10 121.4

-5 103.0

0 87.56

5 74.65

10 63.80

15 54.66

20 46.94

25 40.40

30 34.85

35 30.18

40 26.22

45 22.85

*Temperature vs. resistance coefficient is negative

50 19.96

55 17.47

60 15.33

65 13.49

70 11.89

75 10.50

80 9.297

85 8.247

90 7.330

95 6.528

100 5.824

Table 5: Temperature vs. Resistance

Pre-start

40 GERA-SVX01B-EN


Voltage ImbalanceThree phase electrical power to the unit must meet stringent re-quirements for the unit to operate properly. Measure each leg (phase-to-phase) of the power supply. Each reading must fall within the utilization range listed on the unit nameplate. If any of the readings do not fall within the proper tolerances, notify the pow-er company to correct this situa-tion before operating the unit.

Excessive three phase voltage im-balance between phases will cause motors to overheat and eventually fail. The maximum al-lowable voltage imbalance is 2%. Measure and record the voltage between phases 1, 2, and 3 and calculate the amount of imbalance as follows:

V1, V2, V3 = Line Voltage ReadingsVD = Line Voltage reading that deviates the far-thest from the average voltage.

% Voltage Imbalance = 100 x AV - VD where;

AV

AV (average voltage) = Volt 1 + Volt 2 + Volt 3

3

Example: If the voltage readings of the supply power measured 221, 230 and 227, the average volts would be:

VD (reading farthest from average) = 221

The percentage of Imbalance equals:

The 2.2% imbalance in this exam-ple exceeds the maximum allow-able imbalance of 2.0%. This much imbalance between phases can equal as much as a 20% current imbalance with a resulting in-crease in motor winding tempera-tures that will decrease motor life. If the voltage imbalance is over 2%, notify the proper agencies to correct the voltage problem before operating this equipment.

Electrical Phasing(Three Phase Motors)The compressor motor(s) and the supply fan motor are internally connected for the proper rotation when the incoming power supply is phased as A, B, C.

Proper electrical supply phasing can be quickly determined and corrected before starting the unit by an instrument such as an Asso-ciated Research Model 45 Phase Sequence Indicator and following the steps below:

1 Turn the field supplied discon-nect switch that provides power to the main power terminal block or to the Line side of the optional factory mounted dis-connect switch to the OFF posi-tion.

221 + 230 + 227 = 226 Avg.

3

100 x 226 - 221 = 2.2%

226

2 Connect the phase sequence in-dicator leads to the terminal block or the Line side of the op-tional factory mounted discon-nect switch as follows:

Black (phase A) to L1Red (phase B) to L2Yellow (phase C) to L3

3 Close the field supplied main power disconnect switch or cir-cuit protector switch that pro-vides the supply power to the unit.

WARNINGHazardous Voltage!Disconnect all electric power, in-cluding remote disconnects be-fore servicing. Follow proper lockout/tagout procedures to en-sure the power can not be inad-vertently energized. Failure to disconnect power before servic-ing could result in death or seri-ous injury.

4 Observe the ABC and CBA phase indicator lights on the face of the sequencer. The ABC indica-tor light will glow if the phase is ABC. If the CBA indicator light glows, open the disconnect switch or circuit protection switch and reverse any two power wires.

5 Restore the main electrical pow-er and recheck the phasing. If the phasing is correct, open the disconnect switch or circuit pro-tection switch and remove the phase sequence indicator.

Pre-start

GERA-SVX01B-EN 41

Compressor Crankcase Heaters (Optional)Each compressor can be equipped with a crankcase heater. The prop-er operation of the crankcase heat-er is important to maintain an elevated compressor oil tempera-ture during the OFF cycle to reduce oil foaming during compressor starts. Oil foaming occurs when re-frigerant condenses in the com-pressor and mixes with the oil. In lower ambient conditions, refrig-erant migration to the compressor could increase.

When the compressor starts, the sudden reduction in crankcase pressure causes the liquid refriger-ant to boil rapidly causing the oil to foam. This condition could dam-age compressor bearings due to reduced lubrication and could cause compressor mechanical fail-ures.

Before starting the unit in the COOLING mode, set the system switch to the OFF position and turn the main power disconnect to the ON position and allow the crank-case heater to operate a minimum of 8-hours.

Before closing the main power dis-connect switch, ensure that the SYSTEM selection switch is in the OFF position and the FAN selec-tion switch is in the AUTO posi-tion.

Close the main power disconnect switch and the unit mounted dis-connect switch, if applicable.

WARNINGLive Electrical Components!During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

Upon power initialization, the RTRM performs self-diagnostic checks to ensure that all internal controls are functional. It also checks the configuration parame-ters against the components con-nected to the system. The Liteport LED, located on the RTRM module, is turned ON within one second of power-up if internal operation is okay.

Use one of the following TEST pro-cedures to bypass some time de-lays and to start the unit at the control panel. Each step of unit op-eration can be activated individu-ally by temporarily shorting across the TEST terminals for two or three seconds. The Liteport LED will blink when the test mode has been initiated. The unit can be left in any TEST step for up to one hour before it will automatically terminate, or it can be terminated by opening the main power dis-connect switch. Once the test mode has been terminated, the Liteport LED will glow continuous-ly and the unit will revert to the SYSTEM control.

Pre-start

42 GERA-SVX01B-EN

Test ModesThere are three methods in which the TEST mode may be cycled at LTB-Test 1 and LTB-Test 2.

Step Test Mode: This method initiates the different components of the unit, one at a time, by tem-porarily shorting across the two test terminals for two or three sec-onds.

For the initial start-up of the unit, this method initiates the different components of the unit, one at a time, by temporarily shorting across the two test terminals for two or three seconds.

Resistance Test Mode: This method may be used for start-up providing a decade box for vari-able resistance outputs. This method initiates the different com-ponents of the unit, one at a time, when a specific resistance value is placed across the two test termi-nals. The unit will remain in the specific test mode for approxi-mately one hour even though the resistance is left on the test termi-nals.

Auto Test Mode: This method is not recommended for start-up due to the short timing between indi-vidual component steps. This method initiates the different com-ponents of the unit, one at a time, when a jumper is installed across the test terminals. The unit will start the first test step and change to the next step every 30 seconds. At the end of the test mode, con-trol of the unit will automatically revert to the applied SYSTEM con-trol method.

For unit test steps, test modes and step resistance values to cycle the var-ious components, see Table 6.

Note 1: The condenser fans will operate any time a compressor is ON providing the outdoor tempera-tures are within the operating values.

Note 2: The exhaust fan will turn on anytime the economizer damper position is equal to or greater than the exhaust fan setpoint.

Note 3: Steps for optional accessories and non-applicable modes in unit will be skipped.

Table 6: Service Test Guide

Test Step Mode Fan Econ

(Note 2) Compr 1 Compr 2 Heat 1 Heat 2 Ohms

1

Fan ON

Min Position Setpoint

0%

OFF OFF OFF OFF

2.2K

Min Ventilation ON Selectable OFF OFF OFF OFF

2 EconomizerTest Open ON OPEN OFF OFF OFF OFF 3.3K

3 CoolStage-1 ON Min

PositionON

(Note 1) OFF OFF OFF 4.7K

4(Note 3)

CoolStage-2 ON Min

PositionON

(Note 1)ON

(Note 1) OFF OFF 6.8K

5(Note 3)

HeatStage-1 ON Min OFF OFF ON OFF 10K

6(Note 3)

HeatStage-2 ON Min OFF OFF ON ON 15K

Pre-start

GERA-SVX01B-EN 43

Verifying Proper Air Flow(Units with DD Indoor Fan)Much of the systems performance and reliability is closely associated with, and dependent upon having the proper airflow supplied both to the space that is being conditioned and across the evaporator coil.

The fan motor is factory wired to operate on low speed in the cool-ing and heating mode. It can be re-wired for high speed operation should the application require it. Refer to the wiring diagram on the unit.

The fan motor is specifically de-signed to operate within the Blow-er Horse Power (BHP) parameters listed in the fan performance ta-bles of the unit Service Facts. By understanding that these motors will safely work within these con-ditions, before an oversized motor is required, will allow the air distri-bution system to be set up proper-ly and diagnostics enhanced should a problem occur.

When verifying direct drive fan performance, the tables must be used somewhat differently than those of belt driven fans. Fan per-formance diagnostics can be easi-ly recognized when these tables are used correctly.

Before starting the SERVICE TEST, set the minimum position setpoint for the economizer to 0% using the setpoint potentiometer located on the Economizer Control (ECA), if applicable.

Using Table 6, momentarily jump across the Test 1 and Test 2 termi-nals on LTB1 one time to start the minimum ventilation test.

With the fan operating properly, determine the total system exter-

nal static pressure (inches w.c.) by:

1 Measuring the supply and return duct static pressure.

2 Using the accessory pressure drop table in the Service Facts, calculate the total static pres-sure drop for all of the accesso-ries installed on the unit; (i.e. curb, economizer, etc.)

Note: Static pressure is based on desired CFM and may not be actu-al static pressure.

3 Add the total accessory static pressure drop (Step 2) to the duct external static pressure (Step 1). The sum of these two values represents the total sys-tem external static pressure.

WARNINGLive Electrical Components!During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

4 Measure the amperage at the supply fan contactor and com-pare it with the full load amp (FLA) rating printed on the mo-tor nameplate.

a. Calculate the theoretical BHP

Actual Motor Amps x Motor HPMotor Nameplate Amps

b. Using the fan performance tables in the unit Service Facts, plot the total external static pressure (Step 3) and the BHP (Step 4a) to obtain the operating CFM.

When plotted, if the two val-ues can not be interpolated correspondingly, the static pressure will most likely be the least accurate measure-ment. Because of the direct drive motor operation, the RPM performance is rela-tively constant making the operating current a very reli-able diagnostic tool.

The actual external static pressure is approximately 0.45" w.c., air-flow equals 2100 CFM.

If the static pressure reading was higher, motor current would have to be lower proportionately to get an accurate CFM measurement in direct drive applications.

5 If the required CFM is too low, (external static pressure is high causing motor HP output to be below table value),

a. Relieve supply and/or re-turn duct static.

b. Change indoor fan speed to HIGH and repeat steps 1 through 4.

Example: GERA060 single phase, low speed

Actual Motor Amp (5.25) = 99%Motor Nameplate Amps (5.3)

0.99 x Motor HP (0.6) = .59 BHP

Pre-start

44 GERA-SVX01B-EN

Verifying Proper Air Flow(Units with Belt Drive Fan)Much of the systems performanceand reliability is closely associatedwith, and dependent upon havingthe proper airflow supplied both tothe space that is being conditionedand across the evaporator coil.

The fan speed is changed by open-ing or closing the adjustable motorsheave.

Before starting the SERVICE TEST,set the minimum position setpointfor the economizer to 0% using thesetpoint potentiometer located onthe Economizer Control (ECA), ifapplicable.

Using Table 6, page 42, momen-tarily jump across the Test 1 and Test 2 terminals on LTB1 one time to start the minimum ventilation test.

WARNINGRotating Components!During installation, testing, ser-vicing and troubleshooting of this product it may be necessary to measure the speed of rotating components. Have a qualified or licensed service individual who has been properly trained in han-dling exposed rotating compo-

nents perform these tasks. Failure to follow all safety precautions when exposed to rotating compo-nents could result in death or seri-ous injury.

Once the supply fan has started, check for proper rotation. The di-rection of rotation is indicated by an arrow on the fan housing. With the fan operating properly, deter-mine the total system airflow (CFM) by;

1 Measuring the actual RPM

WARNINGLive Electrical Components!During installation, testing, ser-vicing and troubleshooting of this product, it may be necessary to work with live electrical compo-nents. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical compo-nents perform these tasks. Failure to follow all electrical safety pre-cautions when exposed to live electrical components could re-sult in death or serious injury. 2 Measure the amperage at the

supply fan contactor and com-pare it with the full load amp (FLA) rating printed on the mo-tor nameplate.

a. Calculate the theoretical BHP.

b. Using the fan performance ta-bles in the unit Service Facts,

Actual Motor Amps x Motor HPMotor Nameplate Amps

plot the total external static pressure (Step 1) and the BHP (Step 2) to obtain the operat-ing CFM.

3 If the required CFM is too low, (external static pressure is high causing motor HP output to be below table value),

a. Relieve supply and/or return duct static.

b. Change fan speed and repeat steps 1 and 2.

4 To increase fan RPM; Loosen the pulley adjustment set screw and turn sheave clockwise.

5 To decrease fan RPM; Loosen the pulley adjustment set screw ant turn sheave counterclock-wise.

6 If the required CFM is too high, (external static pressure is low causing motor HP output to be above table value), change fan speed and repeat steps 1 and 2.

7 To stop the SERVICE TEST, turn the main power disconnect switch to the OFF position or proceed to the next component start-up procedure.

Pre-start

5 If the required CFM is too high, (external static pressure is low causing motor HP output to be above table value), increase supply and/or return duct static.


GERA-SVX01B-EN 45

Fan Belt Adjustment(Units with Belt Drive Fan)The fan belts must be inspected periodically to assure proper unit operation.

Replacement is necessary if the belts appear frayed or worn. Units with dual belts require a matched set of belts to ensure equal belt length.

WARNINGRotating Components!During installation, testing, ser-vicing and troubleshooting of this product it may be necessary to measure the speed of rotating components. Have a qualified or licensed service individual who has been properly trained in han-dling exposed rotating compo-nents perform these tasks. Failure to follow all safety precautions when exposed to rotating compo-nents could result in death or seri-ous injury.

When moving or installing the new belts, do not stretch them over the sheaves. Loosen the belts using the belt tension adjustment bolts on the motor mounting base.

Once the new belts are installed, using a BrowningTM or GatesTM tension gauge (or equivalent) illus-trated in Figure 7; adjust the belt tension as follows:

1 To determine the appropriate belt deflection;

a Measure the center-to-center shaft distance (in inches) between the fan and motor sheaves.

b Divide the distance mea-sure in Step 1a by 64; the resulting value repre-sents the amount of belt deflection that corre-sponds to the proper belt tension.

2 Set the large O-ring on the belt tension gauge at the deflection value determined in Step 1b.

3 Set the small O-ring at zero on the force scale of the gauge plunger.

4 Place the large end of the gauge at the center of the belt span; then depress the gauge plunger until the large O-ring is even with the top of the next belt or even with the straightedge placed across the fan and motor sheaves.

5 Remove the belt tension gauge. The small O-ring now indicates a number other than zero on the plunger’s force scale. This num-ber represents the force (in pounds) required to give the needed deflection.

6 Compare the "force" scale read-ing (Step 5) with the appropriate "force" value listed in Table 7. If the "force" reading is outside the range, readjust the belt tension.

Note: Actual belt deflection "force" must not exceed the maximum force value shown in Table 7.

7 Recheck the belt tension at least twice during the first 2 to 3-days of operation. Belt tension may decrease until the new belts are "run-in".

Figure 7: Belt tension gauge

Table 7: Belt tension measurement an deflection ranges

Belts Cross Section A B

Small P.D. Range3.0 - 3.6 3.4 - 4.23.8 - 4.8 4.4 - 5.65.0 - 7.0 5.8 - 8.8

Super Gripbelts

Min 3 4Max 4.5 5.5Min 3.5 5.125Max 5 7.125Min 4 6.375Max 5.5 8.75

Gripnotch

Min 3.875 5.75Max 5.5 8Min 4.5 6.5Max 6.25 9.125Min 5 7.375Max 6.875 10.125

Steel Cable Gripbelts

Min 3.25 4.5Max 4 5.5Min 3.75 5.75Max 4.75 7.25Min 4.25 7Max 5.25 8.75

Pre-start

46 GERA-SVX01B-EN

Return Air Smoke DetectorThe return air smoke detector is designed to shut off the unit if smoke is sensed in the return air stream. Sampling the airflow en-tering the unit at the return air opening performs this function.

In order for the smoke detector to properly sense smoke in the return air stream, the air velocity entering the unit must be between 500 and 4000 feet per minute. Equipment covered in this manual will devel-op an airflow velocity that falls within these limits over the entire airflow range specified in the fan performance tables.

There are certain models however, if operated at low airflow, will not develop an airflow velocity that falls within the required 500 to 4000 feet per minute range. For these models, the design airflow shall be greater than or equal to the minimum CFM specified in W_C-IOM-1B manual. Failure to follow these instructions will pre-vent the smoke detector from per-forming its design function.

Economizer Start-UpUsing Table 6, page 42 momen-tarily jump across the Test 1 and Test 2 terminals on LTB1 one time to start the minimum ventilation test.

1 Set the minimum position set-point for the economizer to the required percentage of mini-mum ventilation using the set-point potentiometer located on the Economizer Control (ECA).

The economizer will drive to its minimum position setpoint, ex-haust fans (if applicable) may

start at random, and the supply fan will start when the SERVICE TEST is initiated.

WARNINGUnexpected Fan Start Up!The supply fan will start when Service Test is initiated and the exhaust fan may start at random. The exhaust fan will start anytime the economizer damper position is equal to or greater than the ex-haust fan setpoint. Leave all ac-cess panels and guards to fan sections in place when perform-ing minimum ventilation test. Fail-ure to follow proper procedure could result in death or serious in-jury.

The exhaust fan will start anytime the economizer damper position is equal to or greater than the ex-haust fan setpoint.

2 Verify that the dampers stroked to the minimum position.

ReliaTel Control3 Momentarily jump across the

Test 1 and Test 2 terminals on LTB1 one additional time if con-tinuing from previous compo-nent start-up or until the desired start-up component test is start-ed.

4 Verify that the dampers stroked to the full open position.


Compressor Start-UpUsing the service test guide in Table 6, page 42, continue the SERVICE TEST start-up procedure for each compressor circuit.

1 Attach a set of service gauges onto the suction and discharge gauge ports for each circuit. Re-fer to the refrigerant circuit illus-tration in the Service Facts.

2 Momentarily jump across the Test 1 and Test 2 terminals on the LTB one additional time if continuing from previous com-ponent start-up or until the de-sired start-up component Test is started.

3 Scroll Compressorsa. Once each compressor has

started, verify that the rota-tion is correct. If a scroll compressor is rotating back-wards, it will not pump and a loud rattling sound can be observed.

Pre-start

GERA-SVX01B-EN 47


b. If the electrical phasing is correct, before condemning a compressor, interchange any two leads (at the com-pressor Terminal block) to check the internal phasing. Refer to page 40 for phase sequencing. If the compres-sor runs backward for an extended period (15 to 30 minutes), the motor wind-ing can overheat and cause the motor winding thermostat to open.

c. Check the compressor oil levels. The oil lever in each compressor sight glass should be 1/2 to 3/4 full when they are OFF.

Note: The scroll compressor uses Trane OIL-42 without substitution. The appropriate oil charge for a 9 and 10-ton scroll compressor is 8-pints. For a 14 and 15-ton scroll compressor, use 14 pints.

4 After the compressor and con-denser fan have started and op-

erated for approximately 30-minutes, observe the operating pressures. Compare the oper-ating pressures to the operat-ing pressure curve in the Service Facts.

5 Check system superheat. Follow the instruction list on the super-heat charging curve in the Ser-vice Facts. (Note: Superheat should be within ±5 F of the su-perheat chart value.

6 Repeat steps 1 through 4 for each refrigerant circuit.


Heating Start-upUsing Table 6, page 42 continue the SERVICE TEST start-up proce-dure for each compressor circuit.


1 Clamp an amp meter around one of the first stage heater power wires at the heater con-tactor.

2 Momentarily jump across the Test 1 and Test 2 terminals on LTB one additional time if con-tinuing from previous compo-nent start-up or until the desired start-up component test is start-ed.

3 Verify that the heater stage is operating properly.

4 Clamp an amp meter around one of the two stage heater power wires at the heater con-tactor (if applicable).

5 Momentarily jump across the test 1 and test 2 terminals on LTB one additional time if con-tinuing from previous compo-nent start-up or until the desired start-up component test is start-ed.

6 Verify that the heater stage is operating properly.


Pre-start

48 GERA-SVX01B-EN

Pre-Startup ChecklistBefore energizing the unit, the following system devices must be checked:

____ Check all electrical connections for tightness and point of termination accuracy.

____ Is the high voltage power supply correct and in accordance with the nameplate ratings?

____ Is phasing of the unit correct per compressor rotation?

____ Is the field wiring and circuit protection the correct size?

____ Is the low voltage control circuit wiring correct per the unit wiring diagram?

____ Is the piping system clean/complete and correct? (A recommendation of all system flushing of debris from the water-to-refrigerant heat exchanger, along with air purging from the water-to-refrigerant heat exchanger be done in ac-cordance with the Closed-Loop/Ground Source Heat Pump Systems Installation Guide).

____ Is unit serviceable? (See page 9 for clearance recommendations).

____ Are the low/high-side pressure temperature caps secure and in place?

____ Is the thermostat in the OFF position?

____ Is the water flow established and circulating through all the units?

____ Is the duct work correctly sized, run, taped, insulated and weather proofed with proper unit arrangement?

____ Is the condensate line properly sized, run, trapped and pitched?

____ Is the zone sensor (when used) correctly wired and in a proper location?

____ Does the indoor blower turn freely without rubbing and is it properly tightened on the shaft? Check the supply fan belts (if applicable) for proper tension and the fan bearings for sufficient lubrication. If the belts require adjustment, or if the bearings need lubricating, refer to the maintenance section for instructions.

____ Has all work been done in accordance with applicable local and national codes?

____ Has heat transfer fluid been added in the proper mix to prevent freezing in closed system application?

____ Are all the unit access panels secure and in place? And, is unit interior free from tools or debris?

____ Verify that the Remote panel SYSTEM selection switch, FAN selection switch, and ZONE TEMPERATURE settings for automatic operation are correct.

____ Is the main disconnect switch or circuit protector switch that provides the supply power to the unit’s terminal block or the unit mounted disconnect switch closed?

____ Is the Night Setback panel (if applicable) programmed for proper unoccupied operation?

Pre-StartupChecklist

GERA-SVX01B-EN 49

Sequence ofOperation

Initial Unit Start-up

Start-up with the conventional thermostat is included below:

1 Set the thermostat to the highest position.

2 Set the thermostat system switch to COOL with the fan control to AUTO. The compressor should NOT run.

3 Reduce the thermostat setting until the compressor, reversing valve, solenoid valve, and loop pump are ener-gized. Adjust water flow utilizing pressure/temperature plugs and comparing to tables contained in specifica-tion sheet data. Water leaving the heat exchanger should be warmer than the entering water temperature (approximately 9°F-12°F); blower operation should be smooth; compressor and blower amps should be within data plate ratings; the suction line should be cool with no frost observed in the refrigerant circuit.

4 Check the cooling refrigerant pressures.

5 Turn the thermostat system switch to the OFF position. Unit should stop running and the reversing valve should de-energize.

6 Leave unit off for approximately FIVE minutes to allow for pressure equalization.

7 Turn the thermostat to the lowest setting.

8 Set the thermostat system switch to the HEAT position.

9 Adjust the temperature setting upward until the unit is energized. Warm air should blow from the register. A water temperature decrease of approximately 5°F to 9°F leaving the heat exchanger should be noted. The blower and compressor operation should be smooth with no frost observed in the refrigeration circuit.

10 Check the heating refrigerant pressures.

11 Set the thermostat to maintain the desired space temperature.

12 Instruct the owner on system operation.

50 GERA-SVX01B-EN

Sequence ofOperation

Water Pressure DropTables 8 and 9 should be used to define feet of head/pressure drop. Please note the feet of pressure (ft/head) provided is at ARI/ISO standard. Note: To calculate feet of head, when using gauges that read in PSIG, multiply PSI by 2.31.

Table 8: Cooling water pressure drops (WPD) in feet of head

Unit Size EWTF GPM Ft.

Pressure036 86 9.0 11.0048 86 12.0 9.0060 86 15.0 13.3072 86 18.0 11.4090 86 22.5 12.1120 86 30.0 15.2150 86 37.5 13.7180 86 45 19.3240 86 60 13.2300 86 75 13.1

Table 9: Heating water pressure drops (WPD) in feet of head

Unit Size EWTF GPM Ft.

Pressure036 68 9.0 12.0048 68 12.0 9.7060 68 15.0 14.3072 68 18.0 12.3090 68 22.5 13.1120 68 30.0 16.4150 68 37.5 14.8180 68 45 20.8240 68 60 14.3

Table 10: Water volume

Unit SizeWater Side

VolumeCubic In.

Water SideVolume

Cubic Ft.

Water Side Volume Gallons

036 76 .044 .329048 171 .099 .74060 171 .099 .74072 259 .15 1.121090 210 .122 .910120 342 .198 1.48150 508 .296 2.201180 508 2.96 2.201240 779 .453 3.374300 1057 .615 4.576

GERA-SVX01B-EN 51

Startup Checklistand Log

Installing Contractor: Use this form to thoroughly check-out the system and units before and during start-up. (This form need not be returned to the factory unless requested during technical service support).

Job Name:Model Number:Date:Serial Number:

In order to minimize troubleshooting and costly system failures, complete the following checks and data entries before the system is put into full operation.

MODE

Entering fluid temperature

Leaving fluid temperature

Temperature differential

return air temperature DB/WB

supply air temperature DB/WB

Temperature differential

Water coil heat exchanger(Water Pressure IN)

Water coil heat exchanger(Water Pressure OUT)

Pressure Differential

HEAT

F

COOL

F

F F

F F

PSIG PSIG

PSIG PSIG

PSIG PSIG

COMPRESSOR

Amps

Volts

Discharge line temperature(after 10 minutes)

F F

F F

F F

F F

52 GERA-SVX01B-EN

Preventive MaintenanceMaintenance on the unit is simplified with the following preventive sugges-tions:Filter maintenance must be performed to assure proper operation of the equipment. Filters should be inspect-ed at least every three months, and re-placed when it is evident they are dirty. Filter sizing includes:

WARNINGHazardous Voltage!Disconnect all electric power, in-cluding remote disconnects be-fore servicing. Follow proper lockout/tagout procedures to en-sure the power can not be inad-vertently energized. Failure to disconnect power before servic-ing could result in death or seri-ous injury.

Check the contactors and relays within the control panel at least once a year. It is good practice to check the tight-ness of the various wiring connections within the control panel.

Unit Size Filter Sizenominal inch

036-060 2/ 20 x 25 x 1072-090 4/ 16 x 25 x 2

120 4/ 20 x 25 x 2

150 2/20 x 20 x 24/20 x 25 x 2

180 2/20 x 20 x 24/20 x 25 x 2

240Downflow

4/20 x 20 x 24/20 x 20 x 2

240Horizontal 8/2- x 25 x 2

300Downflow

4/20 x 20 x 24/20 x 20 x 2

300Horizontal 8/2- x 25 x 2

A strainer (60 mesh or greater) must be used on an open loop system to keep debris from entering the unit heat exchanger and to ensure a clean sys-tem.For units on well water, it is important to check the cleanliness of the water-to-refrigerant heat exchanger. Should it become contaminated with dirt and scaling as a result of bad water, the heat exchanger will have to be back flushed and cleaned with a chemical that will remove the scale. This service should be performed by an experi-enced water treatment specialist.

WARNINGHazardous Chemicals!Coil cleaning agents can be either acidic or highly alkaline. Handle chemical carefully. Proper han-dling should include goggles or face shield, chemical resistant gloves, boots, apron or suit as re-quired. For personal safety, refer to the cleaning agent manufactur-ers Materials Safety Data Sheet and follow all recommended safe handling practices. Failure to fol-low all safety instructions could result in death or serious injury.

Maintenance

It should be noted that the water qual-ity should be checked periodically. (See Table 11).

Note: For other maintenance information concerning the GERA unit, please read W_C-IOM-1A.

Table 11: Water Quality Table

ScalingCalcium and magnesium (total hardness)

Less than 350 ppm

CorrosionpH 7-9.5

Hydrogen Sulfide Less than 1 ppm

Sulfates Less than 25 ppm

Chlorides Less than 125 ppm

Carbon Dioxide Less than 75 ppm

Total dissolved solids (TDS)

Less than 1000 ppm

Biological GrowthIron Bacteria Low

ErosionSuspended Solids Low

GERA-SVX01B-EN 53

Warranty Information

Standard WarrantyThe standard water-source heat pump warranty is Trane parts-only warranty, running 12 months from startup, not to exceed 18-months from shipment.

Extended WarrantyThe optional extended warranty is a second through fifth year warranty. The time starts at the end of the stan-dard 1-year coverage through the fifth year.

These extended warranties apply only to new equipment installed in domestic Trane Commercial Systems Group sales territories and must be ordered prior to start-up.

WarrantyInformation

54 GERA-SVX01B-EN

TroubleshootingChecklist

WARNINGHazardous Service Procedures!The maintenance and trouble shooting procedures recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings pro-vided throughout this manual concerning these procedures. When possible, disconnect all electrical power including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components per these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious in-jury.

Note: For more trouble shooting information, see the W_C-IOM-1A manual located inside the unit.

Problem Heating Cooling Cause Correction

No response to anythermostat setting

X X Main power off Check fusesX X Defective control transformer ReplaceX X Broken or loose connection RepairX X Defective thermostat ReplaceX X Transformer Reset Transformer

Unit short cycles X X Thermostat or sensor improperly located Relocate

Blower runs, but compressor does not

X X Defective compressor overload Replace (if external)X X Defective compressor contactor ReplaceX X Supply Voltage too low CorrectX X Defective compressor capacitor ReplaceX X Defective windings ReplaceX X Limit switches open Check cause/Replace or repair

Insufficient capacity

X X Dirty filter Replace/cleanX X Blower RPM too low Correct

X X Loss of conditioned air due to leaks in ductwork Repair leaks

X Introduction of excessively hot return air CorrectX Introduction of excessively cold return air Correct

X X Low on refrigerant charge Locate leak, repair and recharge by weight (not by superheat)

X X Restricted thermal expansion valve ReplaceX X Defective reversing valve See WSHP-IOM-# for touch test chartX X Thermostat improperly located RelocateX X Unit undersized Recalculate heat gains/lossesX X Inadequate water flow Increase GPMX X Scaling in heat exchanger Clean or replace

X Water too hot Decrease temperatureX Water too cold Increase temperature

High pressure switch open

X Inadequate GPM Increase water flow to unitX Water too hot Decrease temperature

X Inadequate air flow Check, clean blower and coilX Dirty filter Clean/replaceX X Overcharged with refrigerant Decrease chargeX X Defective pressure switch Check or replace

GERA-SVX01B-EN 55

Note: For more trouble shooting information, see the W_C-IOM-1A manual located inside the unit.

Problem Heating Cooling Cause Correction

High head pressure

X Trash in heat exchanger BackflushX Low water flow Increase GPM

X X Overcharge of refrigerant Decrease chargeX X Non-condensable in system Evacuate and recharge by weightX X Water too hot Decrease temperatureX Dirty filter Clean / replaceX Inadequate air flow Check, clean blower and coil

Low suction pressure

X X Undercharged Locate leak, repair and rechargeX X Restricted thermal expansion valve Repair / replace

X Inadequate air flow Check, clean blower and coilX Dirty filter Clean/replace

X Inadequate GPM Increase GPM

Low Pressure switch open

X Inadequate GPM Increase GPMX Water too cold Increase temperature

X Inadequate air flow Increase CFMX Dirty filter Clean/replace

X X Undercharged with refrigerant Increase chargeX X Defective pressure switch ReplaceX X Heat transfer fluid too cold Raise water temperature

TroubleshootingChecklist

Trane has a policy of continuous product and data improvement, and reserves the right to change design and specifications without notice.

Literature Order Number GERA-SVX01B-EN

File Number SV-UN-GERA-SVX01B-0804

Supersedes GERA-SVX01A-EN-0103

Stocking Location InlandTrane A business of American Standard Companieswww.trane.com

For more information, contact your local district office or e-mail us at [email protected]

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