Field Installation Procedure for MicroTech II Centrifugal...

Installation, Operating and Maintenance Manual IM 786

Group: Aftermarket Products

Part Number: 331357301Effective: October 2005Supersedes: January 2004

Field Installation Procedure for MicroTech IICentrifugal Chiller Control Panel Retrofit Kit

Description Kit Part NumberWSC 50/60 Hz, All Models with Touch Screen Panel 300042762WSC 50/60 Hz, All Models without Touch Screen Panel 300042763WDC 50/60 Hz, All Models with Touch Screen Panel 300042764WDC 50/60 Hz, All Models without Touch Screen Panel 300042765Operator Interface Upgrade kit 50/60 Hz 300040547

2 Field Installation Procedure IM 786

2004 McQuay International

IM 786 Field Installation Procedure 3

Table of Contents

Introduction ...................................................................................................... 5Building Automation Systems (BAS) Interface .....................................................................5

Disassembly....................................................................................................... 6Important Note on Downloading Settings..............................................................................6Existing MicroTech Control Panel.......................................................................................10Lube Box (MT 100 with PSC oil pump motor shown)........................................................11

Installing the MT II Control Elements......................................................... 13Install New Panels ...............................................................................................................13Enhanced Surge Protection..................................................................................................18Install New Components......................................................................................................20Sensor Locations..................................................................................................................22Control Panel Connections ..................................................................................................26

Check Out and Startup.................................................................................. 31

Table of FiguresFigure 1, MicroTech 200 Panel .............................................................................................6Figure 2, Existing Data Record: MicroTech 200 ...................................................................7Figure 3, Existing Data Record: MicroTech 100 ...................................................................9Figure 4, Unit Control Panel, brackets and optional Touch Screen Panel ...........................15Figure 5, Unit Control Panel, brackets and optional Touch Screen Panel ...........................16Figure 6, Unit Control Panel and optional Touch Screen Panel mounting locations ...........17Figure 7, Suction temperature sensor location.....................................................................18Figure 8, Sensor Locations on unit (Models WSC/WDC)...................................................22Figure 9, Partial front view of unit.......................................................................................23Figure 10, Detail of sensor locations ...................................................................................23Figure 11, Sensor locations (Models PEH/PFH) .................................................................25Figure 12, Unit Control Panel detail ....................................................................................26Figure 13, Unit Control Panel connections..........................................................................27Figure 14, Compressor Control Panel detail........................................................................28Figure 15, Compressor Control Panel connections..............................................................29

2003 McQuay InternationalIllustrations and information cover McQuay International products at the time of publication and we reserve the right

to make changes in design and construction at anytime without notice.

Manufactured in an ISO Certified Facility


IntroductionThese procedures must be performed only by technicians with training and experience onWestinghouse/McQuay centrifugal water chillers including, but not limited to, MicroTech Series100 and 200 controllers and MicroTech II (MT II) controllers.Before commencing any actual replacement work, review the entire procedure, step by step, for theunit being considered. Also, study the unit to pinpoint the location of the new control components.This should help prevent difficulties during the procedure.The procedure consists of:

1. Disassembling of the old control components2. Installing the MT II control panels3. Installing new sensors and rewiring.4. Installing and configuring new software and checking unit operation.

Building Automation Systems (BAS) InterfaceDetermine if the new chiller controls will be required to tie into the building’s BAS. If so, verifythat the communication protocol is BACnet , LONTALK , or Modbus . Communication modulesfor these protocols can be obtained separately and field installed on the controller. MicroTech IIcannot talk to an existing BAS through McQuay Open Protocol Master Panels (OPM, CVPC,CSC, and direct connections) that may be on the job. Communication module part numbers are:

LONMARK: 350147401BACnet: 350147404Modbus: 350147402

IMPORTANT: Because the new MicroTech II controllers utilizes open, standard protocols listedabove, they are not compatible with legacy MicroTech system controls which utilize legacy,proprietary McQuay Open Protocol . Therefore, the new MicroTech II chiller unit control panel isnot compatible with the existing MicroTech Chiller System Controller (CSC), Chiller PlantController (CPC), MicroTech Monitor software, MicroTech Network Master Panels (NMP), orMicroTech Remote Monitoring and Sequencing (RMS) panels. Your McQuay Representative canhelp you plan the efficient management of your MicroTech and MicroTech II chiller equipment withyour building’s chiller plant or overall building automation system as your building needs change.


Disassembly

Important Note on Transferring SettingsRecord all settings from the existing MicroTech 100 or 200 controller before de-energizing the paneland removing it. Many of the settings will have to be changed from default later in the MT IIcontroller to configure the unit correctly. Forms are included on pages 6 and 7 to record settings.

MicroTech 200Figure 1, MicroTech 200 Panel

Perform the following steps to record setpoint data from the existing MicroTech 200 control. Seemanual OM 200 for detailed information.

Action View Record/IgnorePress Water Setpoints Screen 12, Water Setpoints RecordPress Next Menu Screen 13, Motor Setpoints RecordPress Next Menu Screen 14, Time/Date Ignore*Press Next Menu Screen 15, Schedule Ignore*Press Next Menu Screen 16, Schedule Ignore*Press Next Menu Screen 17, Timers Setpoints RecordPress Next Menu Screen 18-20, Tower Setpoints RecordPress Next Menu Screen 21, Oil Setpoints RecordPress Next Menu Screen 22, Alarms Setpoint RecordPress Next Menu Screen 23, Lead/Lag, dual compressors Ignore*The schedule function is not avaliable in the MTII


Figure 2, Existing Data Record: MicroTech 200MicroTech 200

Setting Value Setting ValueMenu 12, Water Setpoints Screen 2 Screen 1 Stage 1 On Spt Source Stage 4 on Local Spt Stage 2 On Startup DT Stage 3 On Shutdn DT Menu 20 Tower Valve Control Screen 2 Screen1 Chw Reset Valve control Max lvg Spt Valve Spt Return Spt Valve Deadb No Reset at 70°F Min position Reset Signal Max position Max reset N/A on MTII Screen 2

Valve Type Screen 3 Mod Limit

Pulldn Rate Sample Time Amb Lockout N/A on MTII Max ChangeMenu 13, Motor Setpoints PA Time Screen 1 Screen 3 Amp Reset Min Start Position Active Spt Max Start Position Reset Signal N/A on MTII Min Pos At Min Amp Spt Max Pos At Network Spt N/A on MTII Menu 21, Oil Setpoints Max Amp Spt Screen 1 Screen 2 Feed Spt Soft load No Start Diff Begin Amp Lim Htr On Diff Ramp Time Menu 22, Alarms SetpointMenu 14, Time/Date N/A on MTII Screen 1 Screen 1 Low Evap Press Shutdown Hh;mm;ss N/A on MTII Low Evap Press Unload Day N/A on MTII Low Evap Press Hold mm-dd-yy N/A on MTII Screen 2Menu 15, Schedule High Discharge Temp Shutdown Start-stop schedule N/A on MTII High Discharge Temp LoadMenu 16, Schedule High Condenser Press Shutdown Start-stop schedule N/A on MTII Screen 3Menu 17, Timers Setpoints Motor Current Threshold Screen 1 High Oil Feed Temp Start to Start Low Oil Delta Temp Evap recirc Screen 4 Stop to Start Low Net Oil PressureMenu 18 Pump Setpoints Low Disch Superht at Min RLA N/A on MTII Screen 1 High Disch Superht at Min RLA N/A on MTII Evap Pmp Screen 5 Cond Pmp Low Disch Superht at Max RLA N/A on MTIIMenu 19 Cooling Tower Control High Disch Superht at Max RLA N/A on MTII Screen 1 Surge-High Suct Superht-Startinf N/A on MTII Tower Control Screen 6 Tower Stages Surge-High Suct Superht-Running N/A on MTII Stageup Time Evap Water Freeze Stage Dn Time Cond Water Freeze Stage Differential


MicroTech 100

Setpoints reside in three locations on the MicroTech control. There are eight buttons underthe “SETPOINT” heading, only three of which have information to be recorded as shownbelow. The buttons are pressed three times to access three different sets of data. Refer tomanual IM 403.

1. There are thirteen settings under the Service Setpoint button, accessed by repeatedlypressing the button.

2. There are 18 settings under the Set-up Options button.

Action View ActionSETPOINTSPress WATER TEMPERATURE View LWT, Reset, Reset Record DataPress MAXIMUM AMP LIMIT View Amp Limit, Remote Limit, Signal Record DataPress SOFT LOAD View Soft Load, Beginning Amps, Ramp Time Record DataSERVICE SETPOINTSPress 13 times View Setpoints Record 2-13SET-UP OPTIONSPress 18 times View setpoints Record 1-18

SetpointMenus

ServiceSetpointMenus

Set-upOptions


Figure 3, Existing Data Record: MicroTech 100MicroTech 100

Setting ValueSETPOINTS, Password RequiredPress WATER TEMPERATURELLVG EVAP SPTRESET LVG SIG This is a Read Only ValueRMT RESET SIG This is a Read Only ValuePress MAXIMUM AMP LIMITMAX AMP LIMREMOT AMP LIN This is a Read Only ValueREMOT AMP SIGPress SOFT LOADSOFT LOAD AMPBEG AMP LIMITRAMP UP TIMESET-UP OPTIONS, Password RequiredRESET OPTIONSMAX CHW RESETENT EVAP SPTENT EVAP TIMERSTART MODESTART UP DELTA –TSHUTDOWN DELTA-TSTARTTO START TIMESTOP TO START TIMELOAD DELAY N/A on MTIICOND PUMP TMR N/A on MTIITWR STG 1 ONTWR STG 1 OFFTWR STG 2 ONTWR STG 2 OFFENABLE LAGDISABLE LAGDELAY TIMERSERVICE SET-POINTS, Service Password Req’dLOW MTR CURRHOT GAS SPTLOW OIL DELTACALC OIL STP N/A on MTIIHIGH OIL FEEDLOW EVAP PRESSLP OVERRIDEHI DISCHARGEHIGH SUCT RUN N/A on MTIIHIGH SUCT OFF N/A on MTIIHI COND PRESS


WARNINGElectric shock hazard. Disconnect all power sources to the control box.

Existing MicroTech Control PanelChiller may need to be pumped down to allow installation of new pressure transducers and newmechanical high pressure switch before removal of old control panel. As in every case, make surethere is water flow during pumpdown.

CAUTION1. Service on this equipment must be performed by trained, experienced refrigeration

personnel familiar with equipment operation, maintenance, correct servicingpreocdedures, and the safety hazards inherent in this work.

2. Anyone servicing this equipment must comply with EPA requirements regardingrefrigerant reclaimation and venting.

1. De-energize power to existing MicroTech (MT) panel (lock and tag out).

2. Check with VOM for presence of voltage in the MT panel. Isolate and de-energize if present.

3. Check for and disconnect any BAS communication from motherboard or display board.

4. Identify all external wiring to and from the MT panel. Mark as necessary. Factory wiringshould be labeled with wire numbers.

5. Remove all external wiring and conduit.

6. Remove all temperature sensors and discard. MT II uses all new sensors, 10k versus 3k on theolder units.

7. Isolate refrigerant and oil lines connected to MT panel. Remove and cap to prevent loss ofrefrigerant and oil. Isolate the oil sump while there is still some pressure in the system toprevent moisture from entering the tank. This is particularly important on R-134a systems.

8. Remove solenoid coil, wires, and conduit from oil cooler valve, liquid injection valve (ifpresent), and motor cooling valve (if present). Any valves that are not Sporlan brand will haveto be replaced. Older controllers used 115V solenoids coils, MT II use 24V solenoids coils.Alternately, 115V to 24V interposing relays can be added to operate the existing valves.

9. Remove old control panel from chiller.

10. In most cases it is easier to leave the existing lube box on the unit and mount the newcompressor control panel adjacent to it. Two pieces of angle iron can be installed on the existinglube box supports, extending out to provide a mounting location for the new panel.


3

4

56

7

8

Lube Box (MT 100 with PSC oil pump motor shown)There are two basic types of oil pump motors used on Westinghouse/McQuay centrifugal chillers.Many early design chillers with all size compressors, and all chillers (including current production)with compressor sizes CE050 and smaller use a Capacitor Start oil pump motor that has uses avoltage relay. Chillers from approximately 1981 onward with compressor size CE063 and largeruse a Permanent Split Capacitor (PSC) oil pump motor which does not use the voltage relay. Inaddition to the presence or absence of the voltage relay the two style motors use different overloadheaters and different capacitors. The same style oil pump motor will use slightly different valuecapacitors when used in a 50 Hz application as opposed to a 60 Hz application.

To account for these differences some changes to the factory assembled compressor control panelmay be necessary as the kit is set up for a 60Hz PSC oil pump motor, and the chiller which theupgrade kit is being installed in may be different. Details on the necessary changes are documentedin the following section.

1. Remove and discard oil pump contactor(not shown). MT 200 has the pumpcontactor in lube box, . MT 100 hascontactor in the control panel.

2. Remove Voltage Relay (not shown) ifpresent and discard. This is used only onCapacitor Start oil pump motors, and noton PSC oil pump motors. A new one isincluded in the kit for mounting in thecompressor control panel.

3. Re-use Vane Close (VC) pressure switch.

4. Rewire terminal block as required anddocument.

5. Remove and discard oil pump overload Anew overload is included in thecompressor control panel. This may needto have its heater replaced with thealternate. See following instructions.

6. Re-use SA/SB solenoid valve

7. Remove and discard oil pump capacitor(s) . A new capacitor is included in the compressorcontrol panel. This may need to be changed for one of the alternate capacitors, depending uponthe oil pump motor type and Hz. See following instructions.

8. Existing Oil Pressure (OP) switch can be re-used if desired. Wire NO contacts in starter MCRcircuit. MT 200 does not have this switch, the microprocessor senses the pressures and performsthis function.


If the chiller is a 60 Hz unit with a PSC oil pump then no changes to the compressor control panel arenecessary.

If the chiller is not a 60 Hz unit with a PSC oil pump, open the compressor control panel(s) andmake the following changes:

A. If the chiller is a 50 Hz unit with a PSC oil pump motor (unit will not have a voltage relayin the lube box):

1. Remove and discard the p/n 7350767401 capacitor (35 MFD) in the panel and replacewith the included p/n 735067403 capacitor (60 MFD).

B. If the chiller is a 60 Hz unit with a Capacitor Start oil pump motor (Used on CE050compressor which will have a voltage relay in the lube box):


2. Remove and discard the overload heater from the overload and replace with theincluded p/n 735021578

3. Install the included voltage relay p/n 735020118.C. If the chiller is a 50 Hz unit with a Capacitor Start oil pump motor (Used on CE050

compressor which will have a voltage relay in the lube box):


2. Remove and discard the overload heater from the overload and replace with theincluded p/n 735021578

3. Install the included voltage relay p/n 735020118.

IM 786 Field Installation Procedure

Installing the MT II Control Elements

Install New PanelsWhenever possible, mount the MT II control panels in the same location as current productionWSC/WDC units. Mount the unit control panel on the evaporator where the old control panel wasand mount the compressor control panel adjacent to the existing (and remaining) lube box as shownbelow.

MT II compressor control panel mounted to theright of the existing lube box on angle-ironextensions.

End view looking at the new compressor controlpanel. The two angle-iron supports are visible onthe rear of the panel

Some chillers will not accommodate the compressor cso both MT II panels must be mounted on the evaporat

Mount compressor control panel (on left) and unit conSeries 100 control panel was mounted. The plate will hpanels are mounted next to each other (see picture on tneeded for vertical support of compressor control paneTouch Screen Panel, drill and mount arm for display sclocation on unit.

13

MT II unit control panel and Touch Screen Panelmounted on existing evaporator shelf. A small junctionbox has been added to the top to facilitate connections.

View of the existing lube box with the angle-iron justvisible, inserted between the box and the box support.

ontrol panel mounted adjacent to the lube box,or.

trol panel (on right) on the plate where theave to be re-drilled for mounting if bothhe following page). Fabricate brackets wherel. If kit was purchased with an optionalreen. See Figure 5 on page 16 for mounting


Note: The unit control panel has theemergency stop/start switch locatedon the left side, between the twopanels. The switch must be easilyaccessible, so it must be moved,ample space left between the panelsto access the switch, or the positionof the panels must be reversed.

Exploded views of the mounting ofthe unit control panel and TouchScreen Panel (TS) for WSC andWDC vintage units can be found asfollows:

Touch Screen Compressor Box Unit Box

• Figure 3, WSC 050 - 126, WDC 050 – 126, except WDC 079-087 E36/C30 and E36/C36• Figure 4, WDC 079-087 E36/C30 and E36/C36

Various mounting locations for the unit control panel are shown on Figure 5 on page 16.

Use existing MT Series 100/200 wiring diagrams, MT II wiring diagrams, and wiring detailsenclosed in the kit for termination of wiring.

IM

Figure 4, Unit Control Panel, brackets and optional Touch Screen PanelFor WSC 050 - 126, WDC 050 – 126Except WDC 079-087 E36/C30 and E36/C36

786 Field Installation Procedure 15


Figure 5, Unit Control Panel, brackets and optional Touch Screen Panel

WDC 079-087 E36/C30 and E36/C36


Figure 6, Unit Control Panel and optional Touch Screen Panel mounting locations


Enhanced Surge ProtectionCurrent software (late 2003 and after) supports “Enhanced Surge Protection”, which providesimproved protection against possible damage resulting from the compressor going into a surgecondition. The suction sensor is used to transmit temperature conditions to the controller. It isimportant that the sensor be located in the correct position. If not, it must be relocated.

Figure 7, Suction temperature sensor location


If the suction sensor is not in the correct location, complete the following steps.

WARNINGRefrigerant can cause asphyxiation, environmental damage, severe personal injury or death. Follow

EPA procedures for removing charge before continuing installation.

1. Be sure that the charge from the compressor has been removed following EPA or relatedgovernment regulations. The system pressure must be 0 psig to perform this modification.

2. Remove the existing temperature sensor and well. Discard the sensor.3. Remove the suction elbow from the chiller unit.4. Locate the center of the new port approximately 1 inch (2.5 cm) from the Victaulic coupling and

at the five o’clock position as viewed looking into the inlet cone.5. Drill a 1.44 inch hole as shown.6. Weld the ¾ NPT pipe coupling(p/n 735031434) in the new location.7. Insert the suction temperature well (p/n047441511, use Loctite sealant*).8. Install a new 10K temperature sensor (p/n 073007303) into the well.9. Plug the original hole with the ¾ inch plug provided (p/n 735031649, use Loctite sealant*).10. Clean and replace Victaulic gaskets if needed.

*Loctite 277 is recommended. 50ml part number 300040885, 250ml 300040884.


Install New Components1. Chiller may need to be pumped down to allow installation of new pressure transducers and new

mechanical high pressure switch (steps 3 and 5, below) before removal of old control panel. Asin every case, make sure there is water flow during pumpdown.

2. Install new temperature sensors and connect to appropriate controller (compressor or unit).Sensor p/n 073007203 are 90°Sensor p/n 073007303 are straightExtra temperature sensors are included to allow for various installation needs.Oil sump temperature sensor may be p/n 0730007303 (straight) or p/n 330198003 (requireswell), depending upon the vintage of the oil pump. One of each is included for each compressorcontrol panel.

Unit Controller Temp Sensors• Evap entering water temp• Cond entering water temp• Cond leaving water temp• Liquid line temp

Compressor Controller Temp Sensors (oneset for each compressor on a chiller)• Oil sump temp• Compressor suction temp• Compressor discharge temp• Oil feed temp• Evap leaving water temp

3. MT 200 units will have the correct high pressure and low pressure transducers for refrigerantpressure and oil pressure sensing. New transducers are included for use on MT 100 units (bluedot low-pressure range; red dot high-pressure range). Install transducers and terminate incompressor control box. Oil pressure transducer will be installed on existing 1/4" line that fedthe old oil pressure transducer. This line may be shortened with 1/4" male flare fitting withSchraeder valve brazed on the end.

4. Install new 24 VAC solenoid valve and cable on liquid injection solenoid valve (if present),motor cooling solenoid valve (if present) and oil cooler solenoid valve. Terminate at compressorcontrol panel. If compressor has hot gas bypass purchase and install coils for solenoidvalves on HGBP assembly (solenoid coils not included in kit).

5. MT 200 units will have the correct mechanical high pressure switch (MHP) on discharge line.New MHP switches are included for use on MT 100 units. Install switch if not already present,run wiring in flexible conduit, and terminate at compressor control box. See “High PressureSwitch Use” section to determine which switch you should use.

6. Install pLAN communications cables between unit controller and compressor controllers.Sixteen feet of 3-conductor cable (074608901) is enclosed with each compressor control panelfor this purpose.

7. Re-install all conduits from lube box, motor starter, motor temperature (Guardistor )protection, and water flow protection into compressor control panel and terminate wiring.

8. Ensure that correct components have been installed into compressor control panel (seelube box section, pages 10 and 11). Re-wire lube box as required.

9. If applicable, re-install conduits from pump and /or tower controls, external start/stop or alarmcircuit into unit controller and terminate wiring.

10. If purchased, install Touch Screen Panel (TS) flexible arm and TS. Attach cable from TS to unitcontrol panel.


Unit Controller External Inputs/OutputsFor Optional Functions• External start/stop contacts (D.I.)• Water Pumps start/stop contacts (D.O.)• Tower Fans start/stop contacts (D.O.)• External Chilled water temperature reset (A.I.)• External Motor Amps reset (A.I.)• Alarm contacts (D.O.)• Tower fan VFD and/or bypass valve (A.O.)

Compressor Controller Wiring Connections• Oil pump and oil heaters• Motor starter wiring• Oil cooler, liquid injection, and motor cooling

solenoid valves• Motor temperature thermistors• SA/SB solenoid valves• Vane close switch• Evap and cond water flow (pressure) switches• Refrigerant pressure transducers

CAUTIONMechanical high-pressure switch (MHP) and transducers must be installed on unit with MT IIupgrade. Mechanical high-pressure switch must be installed on high side (discharge pressure) abovethe check valve and may not be installed on a valve that can be isolated from system per pressurevessel per A.S.M.E. code.


Sensor LocationsFigure 8, Sensor Locations on unit (Models WSC/WDC)

UNIT CONTROL LER SENSOR LOCATION COMPRESSOR CONTROLLER SENSOR LOCATIONSENSORNUMBER DESCRIPTION SENSOR

NUMBER DESCRIPTION

US02 EVAP. ENTERING WATER TEMP. CS01 OIL SUMP PRESSUREUS03 COND. ENTERING WATER TEMP. CS02 OIL FEED GAUGE PRESSUREUS04 COND. LEAVING WATER TEMP. CS03 EVAP. REFRIGERANT PRESSUREUS05 LIQUID LINE TEMPERATURE CS04 OIL SUMP TEMPERATUREUS09 Not used (Heat Recovery applications only). CS05 COMP. SUCTION TEMPERATUREUS10 Not used (Heat Recovery applications only) CS06 COND. REFRIGERANT PRESSURE

CS07 COMP. DISCHARGE TEMPERATURECS08 % COMPRESSOR AMPS (STARTER)CS09 OIL FEED TEMPERATURECS10 EVAP. LEAVING WATER TEMP.

The illustration above is for a single compressor chiller. On dual compressor chillers thetwo compressor controllers have identical sensor call-outs.


Figure 9, Partial front view of unit

Figure 10, Detail of sensor locations

OIL PUMP VENT LINE,

CENTER-TOP OF SUMP

TO COMPRESSOR

LINE FROM OIL COOLERTO COMPRESSORFILTER

Detail A

Detail EDetail D

Detail C


Detail of sensor locations, continued

Detail B1 for MT 100/200 CS06, cond refrigerant pressure sensor & MHP location

Detail B2 for MT 100/200 CS06, cond refrigerant pressure sensor location & MHP withHGBP


Figure 11, MT200 Sensor locations (Models PEH/PFH)

MT200Sensor No.

MT II SensorNo Description

S00 CS10 Evaporator Leaving Water TemperatureS01 US02 Evaporator Entering Water TemperatureS02 CS05 Compressor Suction TemperatureS03 - External Chilled Water Reset (By Others)S04 - External Motor Current Reset (By Others)S05 - Refrigerant Leak Monitor Signal (By Others)S06 - Evaporator Water Flow Transmitter Signal (By Others)S07 - Condenser Water Flow Transmitter Signal (By Others)S08 US05 Condenser Liquid Line TemperatureS09 US03 Condenser Entering Water TemperatureS10 US04 Condenser Leaving Water TemperatureS11 CS08 Percent Unit AmpsS12 CS07 Compressor Discharge TemperatureS13 CS09 Oil Feed TemperatureS14 CS04 Oil Sump TemperatureS15 CS01 Oil Vent PressureS16 CS03 Evaporator Refrigerant PressureS17 CS06 Condenser Refrigerant PressureS18 CS02 Oil Feed Gauge PressureS19 - Transducer Power Voltage RatioS20 - Outdoor Air TemperatureS21 US09 Not used (Heat Recovery Entering Water Temperature)S22 US10 Not used (Heat Recovery Leaving Water Temperature)

- Spare


Control Panel ConnectionsThe following figures give details of the control panels and how their input and outputconnections are made.

Figure 12, Unit Control Panel detail


Figure 13, Unit Control Panel connections


Figure 14, Compressor Control Panel detail


Figure 15, Compressor Control Panel connections


High Pressure Switch Use

Included in the MicroTech II Retrofit Kit are two different model high pressure switches.

074796301 - SPST-NC switch that trips(opens) at 180psi +/-7psi and resets at 125psi +/- 10psi.

074796302 - SPST-NC switch that trips(opens) at 190psi +/-7psi and resets at 135psi +/- 10psi.

The use of either component should be determined by the rating of the relief valve on the condenser.It is required that the pressure switch trips at a maximum pressure of 90% of the rated relief valvesetting that is installed on the chiller. It is desirable to select the lower rated pressure switch if it issuitable to your application.

For the use of the 190psi pressure switch, the relief valve must be rated at 212psi or greater. For theuse of the 180psi pressure switch the relief valve must be rated at 200psi or greater relief pressure.The 190psi pressure switch allows a little more operating room in the case of running higher saturatedcondenser temperatures.


Check Out and Startup

CAUTIONDisconnect motor leads from compressor before beginning check, test, and start to preventcompressor from starting during start-up. Failure to do so can cause equipment damage.

1. Set dip switches on controllers.

Chiller Comp 1 Comp 2 UnitController Reserved Operator

Interface Reserved

1 2 5 6 7 8A

100000 010000 101000 011000 111000 000100

Six Binary Switches: Up is ‘On’, indicated by ‘1’. Down is ‘Off’, indicated by ‘0’.

2. Re-check all wire terminations to verify they are landed correctly.

3. Power up 115 volt circuit.

4. Check for proper voltages.

5. If the unit controller and compressor controller(s) have not been pre-loaded with softwarecontact Parts Tech Group @ 763-553-5403 for assistance in obtaining the necessary equipmentto load software into the controllers. This will also involve loading software into the optionalTouch Screen Panel. Input the specific chiller operating and equipment protection parameterspreviously recorded from the old controller, after reviewing and checking against factorydefaults and current system design conditions.(See instructions in OM CentrifMicro II forprocedure).

CAUTIONEach of the MicroTech controllers must have compatible software versions(the latest version is

always recommended), including the Touch Screen software and UCM module. Controllers trying tocommunicate with mixed software versions will result in corrupt data and may cause unexpected

events, such as random output energizing and possible compressor damage. Always follow properdownload procedures and check software versions on all controller devices and Touch Screen before

attempting to operate the chiller.

6. Check operation of all safety and operating controls.

7. Dry run starter.

8. Re-commission chiller.

The following are trademarks or registered trademarks of their respective companies: BACnetfrom ASHRAE; LONMARK and LONWORKS from Echelon Corporation; Loctite from LoctiteCorporation, Sporlan from Sporlan Valve Company, Victaulic from Vitaulic Company, andGuardistor, MicroTech, MicroTech II, Open Protocol, and Protocol Selectability from McQuayInternational.

(800) 432-1342 • www.mcquay.com IM 786 (01/04)

This document contains the most current product information as of this printing. For the most current productinformation, please go to www.mcquay.com.

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