INSTALLATION INSTRUCTIONS - Lennox€¦ · horizontal left− and right−hand unit dimensions...

01/11 506275−01

��

�2011 Lennox Industries Inc.Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS FOR FUTUREREFERENCE

WARNINGImproper installation, adjustment, alteration, service ormaintenance can cause personal injury, loss of life, ordamage to property.

Installation and service must be performed by a licensedprofessional installer (or equivalent) or a service agency.

NOTICEA thermostat is not included and must be orderedseparately.

� The Lennox icomfort Touch® thermostat must be usedin communicating applications.

� In non−communicating applications, the LennoxComfortSense® 7000 thermostat may be used, as wellas other non−communicating thermostats.

In all cases, setup is critical to ensure proper systemoperation. Field wiring for both communicating and non−communicating applications is illustrated in diagrams,which begin on page 11.

Shipping and Packing List

Check unit for shipping damage. Consult last carrier

immediately if damage is found.

Package 1 of 1 contains the following:

1 � Assembled air handler unit

INSTALLATIONINSTRUCTIONS

Dave Lennox Signature®

Collection CBX40UHV Units

AIR HANDLER506275−0101/11Supersedes 12/10

Table of Contents

Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . . Model Number Identification 4. . . . . . . . . . . . . . . . . . . . Upflow Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . Horizontal LH/RH Unit Dimensions 3. . . . . . . . . . . . . . General 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation Clearances 4. . . . . . . . . . . . . . . . . . . . . . . . . Requirements 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installing the Unit 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brazing Connections 8. . . . . . . . . . . . . . . . . . . . . . . . . . . Installing the Condensate Drain 9. . . . . . . . . . . . . . . . . Inspecting and Replacing Filters 10. . . . . . . . . . . . . . . . . Sealing the Unit 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Field Control Wiring 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Handler Control Button, Display and Jumpers 18. . Target CFM Tables 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuring Unit 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Error Code Recall Mode 32. . . . . . . . . . . . . . . . . . . . . . . . Indoor Blower Test 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checkout Procedures 33. . . . . . . . . . . . . . . . . . . . . . . . . . Operation 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maintenance 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cabinet Insulation 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A B

DC E

TOP CAP SHIPPING BRACKET (REPLACESCREWS IN TOP CAP AFTER REMOVAL).

HORIZONTAL DRAIN PAN (SEE UPFLOWAPPLICATIONS ON PAGE 5 ANDDOWNFLOW APPLICATIONS ON PAGE 5 )

BLOWER HOUSING SUPPORT PAD.

REFRIGERANT LINE PLUGS (SEEBRAZING CONNECTION ON PAGE 8] .

MERV16 AIR FILTER ISENCLOSED IN PLASTIC BAG.REMOVE FROM BAG BEFOREOPERATING EQUIPMENT.

CHECK FOR AND REMOVE ITEMS A THROUGH E BEFORE OPERATING UNIT.

WHENEVER ELECTRIC HEAT IS INSTALLED THE AHC MUST BEMANUALLY CONFIGURED. SEE JUMPERS AND LINKS GUIDE ONPAGE 17.

IMPORTANT INFORMATION TO INSTALLER

ELECTRIC HEAT SECTIONS MUST BECONFIGURED. IF INSTALLED SEEPROCEDURE IN FIGURE 19 ON PAGE 27.

FOR PROPER OPERATION THE ELECTRIC HEAT (IF APPLICABLE) MUST BECONFIGURED (SET−UP) THROUGH THE AIR HANDLER CONTROL (AHC)

H

H

CONFIGURE ELECTRIC HEAT

ECB40

E

B

A

Litho U.S.A.

Upflow Unit Dimensions � Inches (Millimeters)

OPTIONALELECTRIC

HEAT (FIELD−INSTALLED)

AIRFLOW

LIQUIDLINE

SUCTIONLINE

SUPPLY AIROPENING

RETURN AIR

LOW VOLTAGEINLETS (TOP AND

RIGHT SIDE)

RETURN AIR

Top View

Front View Side View

BLOWER

PIPING PLATE DETAIL(FOR UPFLOW POSITIONS)

A

B C

11-1/16 (281)

D

F E

LIQUID LINE

SUCTION LINE

CONDENSATE DRAINS (2)(HORIZONTAL)

COIL

3/4 (19)

3/4 (19)

5/8 (16)5/8 (16) 1 (25)

5/8 (16)

1-3/4 (44)

2(51)

1-1/8 (29) 4-3/8 (111)

7 (178)

9-9/16(243)

3-1/2 (89)

UPFLOW POSITION

CONDENSATE DRAINS (2)(UPFLOW AND DOWNFLOW)

FILTER ACCESS

H

G

LINE VOLTAGEINLETS (TOP

AND LEFT SIDE)

5/8 (16)

3/4 (19)

KNOCKOUT FOR OPTIONALHEALTHY CLIMATE®

GERMICIDAL UVC LIGHT.

Table 1. Model Dimensions (Upflow, LH and RH Horizontal Applications)

Dim.−024/−030/−036 −042/−048/−060

in. (mm) in. (mm)

A 55−1/4 (1403) 62−3/4 (1594)

B 21−1/4 (540) 21-1/4 (540)

C 22−5/8 (575) 25-5/8 (575)

D 19−3/4 (502) 19-3/4 (502)

E 21 (533) 23 (584)

F 20 (508 ) 21 (533)

G 26−3/8 (670) 27-7/8 (708)

H 28−7/8 (733) 34-7/8 (886)

CBX40UHV SERIES

Horizontal Left− and Right−Hand Unit Dimensions � Inches (mm)

LIQUIDLINE

SUCTIONLINE

SUPPLYAIR

OPENING

FILTER

LOW VOLTAGEINLETS (BOTTOM

AND RIGHTSIDE)

Top View

Front View

BLOWER

H

B

C

D

LIQUIDLINE

SUCTIONLINE

CONDENSATEDRAINS (2)

(UPFLOW ANDDOWNFLOW)

CONDENSATEDRAINS (2)

(HORIZONTAL)

COIL

3/4(19)

3/4 (19)

1-1/2(38)

1-3/4(44)

10(254)

2(51)

1-1/8(29)

RETURN AIROPENINGF

E

5/8 (16)

5/8 (16)

5/8 (16)

End View

AIRFLOW

OPTIONAL ELECTRICHEAT (FIELD−INSTALLED)

11-1/16(281)

LINE VOLTAGEINLETS (TOP

AND RIGHTSIDE)

9-9/16(243)

4-3/8(111)

LIQUIDLINE

SUCTIONLINE

SUPPLYAIR

OPENING

FILTER

LOW VOLTAGEINLETS (TOP AND

LEFT SIDE)

End View

BLOWER

B

C

D

COIL

3/4 (19)

3/4 (19)

RETURNAIR OPENING

F

E

5/8 (16)

5/8 (16)

5/8 (16)

End View

AIRFLOW

OPTIONAL ELECTRICHEAT (FIELD INSTALLED)

LINE VOLTAGE INLETS(BOTTOM AND LEFT SIDE)

Horizontal Position(Right-Hand Air

Discharge)

FILTER ACCESS

FILTERACCESS

10(254)

1-1/2(38)

1-3/4(44)

CONDENSATE DRAINS (2)(HORIZONTAL)

A

5/8 (16)

G

H

A5/8(16)

G

1 (25)

1 (25)

11-1/16(281)

PIPING PLATE

DETAIL

LIQUIDLINE

SUCTION LINE2

(51)

1-1/8(29)

4-3/8(111)

Horizontal Position(Left-Hand Air

Discharge)

Top View

Front View

3/4(19)

End View

FOR DIMENSIONS �A" THROUGH�H", SEE CHART ON PAGE 2.

3/4 (19)

PIPING PLATE

DETAIL

9-9/16(243)

KNOCKOUT FOR OPTIONAL HEALTHYCLIMATE® GERMICIDAL UVC LIGHT.

KNOCKOUT FOR OPTIONAL HEALTHYCLIMATE® GERMICIDAL UVC LIGHT.

Model Number Identification

Refrigerant TypeX = R−410A

Series

Nominal Cooling Capacity024 = 2 tons

030 = 2.5 tons036 = 3 tons

042 = 3.5 tons048 = 4 tons

060 = 5 tons5

Minor Revision Number

ConfigurationUHV = Up−Flow/Horizontal, Variable

Speed Blower MotorVoltage230 = 208/230V−60hz−1ph

Refrigerant Metering Device2 = Fixed Orifice3 = TXV − Bleedport (indoor unit)4 = TXV − Non−bleedport (indoor unit)5 = TXV − Non−bleedport (outdoor unit)6 = TXV − R−410A Non−bleedport (indoor unit)

Unit TypeCB = Air Handler

CB X 40 UHV − 036 − 230 − 6 − 01

General

The Dave Lennox Signature® Collection CBX40UHV airhandler units are designed for installation with optionalfield−installed electric heat and a matched remote outdoorunit that is charged with HFC−410A refrigerant. Theseunits, designed for indoor installation in multiple positions,are completely assembled for upflow and horizontalright−hand air discharge before being shipped from thefactory.

All CBX40UHV air handlers are equipped with afactory−installed, internally mounted check expansionvalve (CTXV), which is suitable for use in HFC−410Aapplications.

This air handler is compatible with the ComfortSense®

7000 non−communicating thermostat and non−communicating outdoor units. In addition, this unit has theenhance capability of communicating with the icomfortTouch® Communicating thermostat and communicatingoutdoor units using the Lennox RSBus protocols.

NOTE � For downflow or horizontal left−hand air

discharge, certain field modifications are required.

These instructions are intended as a general guide and donot supersede local or national codes in any way. Consultauthorities having jurisdiction before installation. Checkequipment for shipping damage; if found, immediatelyreport damage to the last carrier.

Installation Clearances

Cabinet 0 inch (0 mm)

To Plenum 1 inch (25 mm)

To Outlet Duct within 3 feet (914mm)

1 inch (25 mm)

Floor See Note #1

Service / Maintenance See Note #21 Units installed on combustible floors in the downflow position withelectric heat require optional downflow additive base.

2 Front Service Access − 24 inches (610mm) minimum.

NOTE � If cabinet depth is more than 24 inches (610 mm), allow aminimum of the cabinet depth plus 2 inches (51 mm).

WARNINGProduct contains fiberglass wool.

Disturbing the insulation in this product during installa-tion, maintenance, or repair will expose you to fiberglasswool. Breathing this may cause lung cancer. (Fiberglasswool is known to the State of California to cause cancer.)

Fiberglass wool may also cause respiratory, skin, andeye irritation.

To reduce exposure to this substance or for further infor-mation, consult material safety data sheets availablefrom address shown below, or contact your supervisor.

Lennox Industries Inc.P.O. Box 799900Dallas, TX 75379−9900

IMPORTANTThe Clean Air Act of 1990 bans the intentional venting ofrefrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.Approved methods of recovery, recycling or reclaimingmust be followed. Fines and/or incarceration may belevied for noncompliance.

WARNINGDuring blower operation, the ECM motor emits energythat may interfere with pacemaker operation.Interference is reduced by both the sheet metal cabinetand distance.

CBX40UHV SERIES

CAUTIONPhysical contact with metal edges and corners whileapplying excessive force or rapid motion can result inpersonal injury. Be aware of, and use caution whenworking near these areas during installation or whileservicing this equipment.

Requirements

In addition to conforming to manufacturer’s installationinstructions and local municipal building codes, installationof Lennox air handler units (with or without optional electricheat), MUST conform with the following National FireProtection Association (NFPA) standards:

� NFPA No. 90A � Standard for Installation of AirConditioning and Ventilation Systems

� NFPA No. 90B � Standard for Installation ofResidence Type Warm Air Heating and AirConditioning Systems

This unit is approved for installation clearance tocombustible material as stated on the unit rating plate.Accessibility and service clearances must takeprecedence over combustible material clearances.

Installing the Unit

DISASSEMBLE AND REASSEMBLE AIR HANDLERUNIT

This unit consists of two sections which are shipped

assembled from the factory. If necessary, the unit may bedisassembled to facilitate setting the unit. Follow the stepsbelow:

To disassemble:

1. Remove access panels.

2. Remove both blower and coil assemblies. This willlighten the cabinet for lifting.

3. Remove one screw from the left and right postsinside the unit. Remove one screw from each sideon the back of the unit. Unit sections will nowseparate.

To reassemble:

1. Align cabinet sections together.

2. Reinstall screws.

3. Replace blower and coil assemblies.

4. Replace access panel.

DOWNFLOW APPLICATION

Use the installation instructions provided with thedownflow kit.

Table 2. Optional Downflow Conversion Kits (Downflow Only)

Model/Size Kit Numbers

CBX40UHV−024, −030, and −036 83M57

CBX40UHV−042, −048, and −060 43W10

In downflow applications when used with a ECB40 heatsection, a Downflow Additive Base Kit (44K15) will berequired. Installation instructions are included with thereference kit.

UPFLOW APPLICATION

Use the following procedures to configure the unit forupflow operations:

HORIZONTAL DRAIN PAN(MUST BE REMOVED FORUPFLOW APPLICATIONS)

UPFLOW/DOWNFLOW

DRAIN PAN

Figure 1. Upflow Configuration

1. The horizontal drain pan must be removed whenthe coil blower is installed in the upflow position.Removing horizontal drain pan will improve airflow.

2. After removing horizontal drain pan, place the unitin desired location. Set unit so that it is level.Connect return and supply air plenums as requiredusing sheet metal screws as illustrated in figure 1.

3. Install units that have no return air plenum on astand that is at least 14" (356 mm) from the floor toallow for proper air return. Lennox offers an optionalupflow unit stand as listed in table 3.

Table 3. Optional Side Return Stand (Upflow Only)

Model/Size Kit Number

CBX40UHV−All Sizes 45K32

HORIZONTAL RIGHT−HAND AIR DISCHARGEAPPLICATION

NOTE � When air handler is located above a finishedspace, the secondary drain pan must have a largerfootprint than the air handler. In addition, a 3/4" (19.1MM)overflow drain line must be:

� Connected to secondary drain pan

or

� Connected to the overflow drain outlet of the airhandler drain pan.

Use the following procedures to configure the unit forhorizontal right−hand air discharge operations:

NO ADJUSTMENT IS NECESSARY

UPFLOW / DOWNFLOWDRAIN PAN

HORIZONTALDRAIN PAN

Figure 2. Right−Hand Air Discharge Configuration

1. No further adjustment is necessary. Set unit so thatit is sloped 1/4" (6.35 mm) towards the drain pan endof the unit.

2. If the unit is suspended, the entire length of thecabinet must be supported. If you use a chain orstrap, use a piece of angle iron or sheet metalattached to the unit (either above or below) tosupport the length of the cabinet. Use securingscrews no longer than 1/2" (12.7mm) to avoiddamaging the coil or filter as illustrated in figure 3.Use sheet metal screws to connect the return andsupply air plenums as required.

HORIZONTAL RIGHT−HAND AIR DISCHARGE APPLICATION IN HIGH HUMIDITY AREAS

For horizontal applications in high humidity areas, sealaround the drain pan connections plus liquid and suctionlines, to prevent humid air from infiltrating into the unit.

FRONT VIEW END VIEW

ANGLE IRON ORSHEET METAL

ELECTRICAL INLETCLEARANCE 4 IN. (102 MM)

1/2 IN. SCREWS MAXIMUM

Figure 3. Suspending Horizontal Unit

IMPORTANTWhen removing the coil, there is possible danger ofequipment damage and personal injury. Be careful whenremoving the coil assembly from a unit installed in right−or left−hand applications. The coil may tip into the drainpan once it is clear of the cabinet. Support the coil whenremoving it.

HORIZONTAL LEFT−HAND AIR DISCHARGEAPPLICATION

Use the following procedures to configure the unit forhorizontal left−hand air discharge operations:

1. Pull the coil assembly from unit. Remove thehorizontal drain pan.

2. Remove the drain plugs from back drain holes onhorizontal drain pan and reinstall them on frontholes.

IMPORTANTAfter removal of drain pan plug(s), check drain hole(s) toverify that drain opening is fully open and free of anydebris. Also check to make sure that no debris has falleninto the drain pan during installation that may plug up thedrain opening.

Figure 4. Left−Hand Discharge Configuration

3. Rotate drain pan 180º front-to-back and install it onthe opposite side of the coil.

4. Remove screws from top cap as illustrated in figure5, detail A.

5. Remove horizontal drip shield screw located in theleft center of the back coil end seal as illustrated infigure 5, detail A.

6. Rotate horizontal drip shield 180º front to back.

7. Remove plastic plug from hole located on the leftcenter of front coil end seal and reinstall plug inback hole on rear coil end seal.

CBX40UHV SERIES

8. Reinstall horizontal drip shield screw in front coilend seal. Drip shield should drain downward intohorizontal drain pan inside coil.

9. Rotate top cap 180º front-to-back and align withunused screw holes. Holes must align with front andback coil end plates. The top cap has a 45º bend onone side and a 90º bend on the other. The 90º bendmust be on the same side as the horizontal drain panas illustrated in figure 5, detail B.

NOTE � Be very careful when you reinstall the screws into

coil end plate engaging holes. Misaligned screws may

damage the coil.

10. From the upflow position, flip cabinet 90º to the leftand set into place. Replace coil assembly. Replacecoil assembly. Install drain pan between exterior innerwall and tab as illustrated in figure 5, detail C.

11. Knock out drain seal plate from access door.Secure plate to cabinet front flange with screwprovided.

12. Flip access door and replace it on the unit.

13. Set unit so that it is sloped 1/4 inch (6.35mm)toward the drain pan end of the unit. Connect returnand supply air plenums as required using sheetmetal screws.

14. If suspending the unit, it must be supported alongthe entire length of the cabinet. If using chain orstrap, use a piece of angle iron or sheet metalattached to the unit (either above or below) so thatthe full length of the cabinet is supported. Usesecuring screws no longer than 1/2" (12.7mm) toavoid damage to coil or filter as illustrated in figure3. Connect return and supply air plenums asrequired using sheet metal screws.

90ºBEND

CABINETSUPPORT

COIL SHOWN IN UPFLOW POSITION FOR EASYCONVERSION (LEFT−HAND AIR DISCHARGE)

TOP CAPSCREWS

DRAIN PANREINSTALLED

HERE

DRAIN PANSHIPPINGLOCATION

TOP CAP ROTATED TOCORRECT POSITION

�� DRAIN PLUGS ��REINSTALLED HERE REMOVED FROM HERE

BACK COILEND SEAL

TOP CAP

90ºBEND

ALIGN HOLES WITHHOLES IN COIL ENDPLATE.

INSTALL DRAIN PANBETWEEN TAB AND

EXTERIOR INNER WALL.

DETAIL A

DETAIL B

DETAIL C

HORIZONTAL DRIPSHIELD SCREW(FRONT COIL ENDSEAL)

FRONT VIEW

3/16" PLASTICPLUG (REAR COILEND SEAL)

Figure 5. Field Modification for Left−Hand Air Discharge

Brazing Connections

REMOVE ACCESS PANELA

REMOVE RUBBER PLUG FROM BOTH LIQUID ANDSUCTION LINESB

USE A WET RAG TO PROTECT CTXVSENSING BULB WHEN BRAZING SUCTIONLINE CONNECTIONS.

C

NITROGEN

HIGHLOW

EITHER REMOVE OR PUSH PIPE WRAPPING BACKTHROUGH HOLE IN PIPING PLATE BEFORE LINE SETCONNECTION AND BRAZING.

D

E CONNECT PIPES

F CONNECT GAUGES ANDSTART NITROGEN FLOW

G PLACE A WET RAG AGAINST PIPING PLATEAND AROUND THE SUCTION LINECONNECTION. A

HBRAZE CONNECTION. ALLOW PIPE TO COOLBEFORE REMOVING WET RAG FROM CTXVSENSING BULB AND PIPING PANEL AREA.

I REPEAT PREVIOUS PROCEDURE FOR LIQUID LINE.

NOTE � REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FORREFRIGERANT PIPING SIZE REQUIREMENTS.

NOTE � REFRIGERANT LINE SETSSHOULD BE ROUTED TO ALLOW FILTERACCESSIBILITY.

NOTE � CBX40UHV SERIES UNITS USE NITROGEN OR DRY AIR AS AHOLDING CHARGE. IF THERE IS NO PRESSURE WHEN THE RUBBERPLUGS ARE REMOVED, CHECK THE COIL FOR LEAKS BEFOREINSTALLING.

REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR LEAKTESTING, EVACUATING AND CHARGING PROCEDURES

FLOW REGULATED NITROGEN (AT 1 TO 2 PSIG) THROUGH THEREFRIGERATION GAUGE SET INTO THE VALVE STEM PORTCONNECTION ON THE OUTDOOR UNIT LIQUID LINE SERVICEVALVE AND OUT OF THE VALVE STEM PORT CONNECTION ONTHE SUCTION SERVICE VALVE.

PIPING PLATE

PLEASE READ IMPORTANT ISSUES CONCERNING BRAZINGOPERATIONS ON PAGE 7 BEFORE PROCEEDING.

NOTE − Use silver alloy brazing rods with five or six percentminimum silver alloy for copper−to−copper brazing, 45percent alloy for copper−to−brass and copper−to−steelbrazing.

Figure 6. Brazing Connections

CBX40UHV SERIES

IMPORTANTTo prevent the build up of high levels of nitrogen whenpurging, be sure it is done in a well ventilated area. Purgelow pressure nitrogen (1 to 2 psig) through the refrigerantpiping during brazing. This will help to prevent oxidationand the introduction of moisture into a system.

WARNINGPolyol ester (POE) oils used with HFC−410A

refrigerant absorb moisture very quickly. It is very

important that the refrigerant system be kept closed as

much as possible. DO NOT remove line set caps or

service valve stub caps until you are ready to make

connections.

WARNINGDanger of fire. Bleeding the refrigerantcharge from only the high side may resultin the low side shell and suction tubingbeing pressurized. Application of abrazing torch while pressurized mayresult in ignition of the refrigerant and oilmixture − check the high and lowpressures before unbrazing.

WARNINGWhen using a high pressure gas such asdry nitrogen to pressurize a refrigerationor air conditioning system, use aregulator that can control the pressuredown to 1 or 2 psig (6.9 to 13.8 kPa).

CAUTIONBrazing alloys and flux contain materials which arehazardous to your health.

Avoid breathing vapors or fumes from brazingoperations. Perform operations only in well ventilatedareas.

Wear gloves and protective goggles or face shield toprotect against burns.

Wash hands with soap and water after handling brazingalloys and flux.

Table 4. CBX40UHV Refrigerant Connections andLine Set Requirements

Models Liquid

Line

Vapor/

Suction

Line

L15 Line Set

−024, −030,

and −036

3/8 (10) 3/4 (19) L15 line set sizes are

dependent on unit

matchups. See CBX32MV

Engineering Handbook to

determine correct line set

sizes.

−042, and

−048

3/8 (10) 7/8 (22)

−060 3/8 (10) 7/8 (22)

NOTE � Some applications may required a field provided 7/8" to1−1/8" adapter.

NOTE � When installing refrigerant lines longer than 50feet, see the Lennox Refrigerant Piping Design andFabrication Guidelines, CORP. 9351−L9, or contactLennox Technical Support Product Applications forassistance. To obtain the correct information from Lennox,be sure to communicate the following information:

Installing the Condensate Drain

IMPORTANTAfter removal of drain pan plug(s), check drain hole(s) toverify that drain opening is fully open and free of anydebris. Also check to make sure that no debris has falleninto the drain pan during installation that may plug up thedrain opening.

MAIN DRAIN

Connect the main drain and route downward to drain line orsump. Do not connect drain to a closed waste system. Seefigure 8 for typical drain trap configuration.

OVERFLOW DRAIN

It is recommended that the overflow drain is connected to aoverflow drain line for all units. If overflow drain is notconnected, it must be plugged with provided cap.

For downflow orientation, the overflow drain MUST beconnected and routed to a overflow drain line. See figure 8for main and overflow drain locations based on coilorientation.

LEFT−HAND AIRDISCHARGE

MAIN DRAIN ONRIGHT

OVERFLOWDRAIN ON LEFT

UPFLOW ORDOWNFLOW

RIGHT−HAND AIRDISCHARGE

Figure 7. Main and Overflow Drain Locations based onCoil Orientation

ABOVEFINISHEDSPACE?

OVERFLOW DRAIN LINE

ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TOROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGEOVERFLOW SWITCH KIT. WIRE KIT TO SHUT DOWNCOMPRESSOR PER INSTRUCTIONS.

NO

YES

LENNOX #X3169

CLEAN OUT

VENT

PRESS IN(DO NOT GLUE)

VENT MUST EXTENDABOVE HEIGHT OFCOIL DRAIN PAN BYTWO INCHES (51MM)

1" X 3/4" X 3/4"REDUCINGTEE WITH

PLUG

LENNOX* P−TRAP49P66, J−TRAP #91P90 OR ANY

PVC SCH 40 P− ORJ−TRAP 3/4"

OVERFLOWDRAIN

OPTIONALSAFETY

PAN

AIR HANDLER DRAIN PAN

WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A 3/4" (19.1MM) SECONDARY DRAINLINE MUST BE:

� CONNECTED TO SECONDARY DRAIN PAN

OR

� CONNECTED TO THE OVERFLOW DRAIN OUTLET OF THE AIR HANDLER DRAIN PAN.

TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES �GENERALLY, TWO INCHES (51MM).

DRAIN LINE SHOULDSLOPE A MINIMUM OFONE INCH PER 10FEET (25MM PER 3METERS)

NOTE � WHEN A AIR HANDLER IS LOCATED ABOVE A FINISHED SPACE THE SECONDARYDRAIN PAN MUST HAVE A LARGER FOOTPRINT THAN THE AIR HANDLER.

MAINDRAIN

TO APPROVEDDRAIN

FOR NEGATIVE PRESSURE COILS (BLOWERAFTER COIL) TRAPS ARE REQUIRED ON ALLDRAIN LINES CONNECTED TO COIL.

COMPACT OVERFLOW SWITCH WITH 3/4" FEMALE SLIP INLETAND MALE ADAPTER, TWO PART DESIGN FOR USE WHEREOBSTRUCTIONS PREVENT DIRECT THREADING

SECONDARYDRAIN PAN

2"(51MM)

TRAP DEPTH

*LENNOX P−TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J−TRAP 91P90.

Figure 8. Typical Main and Overflow Drain

BEST PRACTICES

The following best practices are recommended to ensurebetter condensate removal:

� Main and overflow drain lines should NOT be smallerthan both drain connections at drain pan.

� Overflow drain line should run to an area wherehomeowner will notice drainage.

� It is recommended that the overflow drain line be

vented and a trap installed. Refer to local codes.

Inspecting and Replacing Filters

IMPORTANTFilter access door must be in place during unit operation.Excessive warm air entering the unit from unconditionedspace may result in water blow−off problems.

Filters may be duct−mounted or installed in the cabinet.The air handler comes from the factory with an installed 5"(127mm) MERV 16 filter in a sealed plastic bag. Plasticbag MUST be remove before unit operation start up. Note

that filter access door fits over access panel. Air will leak ifthe access panel is placed over the filter door.

IMPORTANTPlastic bag must be removed from filter.

Filters should be inspected monthly and must be cleanedor replaced when dirty to assure proper air handleroperation.

To replace filter:

1. Loosen the thumbscrews holding the filter door inplace.

2. Slide the filter out of the guides on either side ofcabinet.

3. Insert new filter.

4. Replace door.

Air Handler comes from factory with 5" (127mm) � MERV16 filter. Filter section can be modified to accept a 1"(25.4mm) filter as illustrated in figure 9. See table below forreplacement filter sizes.

CBX40UHV SERIES

Table 5. MERV16 Disposable Filter (five inch)Dimensions (CBX40UHV)

Unit Model No. Filter Size Inches (mm) Catalog #

CBX40UHV−024,−030 and −036

20 x 20 x 5 (508 x 508 x 127) X7935

−CBX40UHV−048,−042, and −060

20 x 25 x 5 (508 x 635 x 127) X6675

Table 6. Disposable Filter (one inch)Dimensions (CBX40UHV)

Unit Model No. Filter Size Inches (mm) Catalog #

CBX40UHV−024,−030 and −036

20 x 20 x 1 (508 x 508 x 25) X1963

−CBX40UHV−048,−042, and −060

20 x 25 x 1 (508 x 635 x 25) X1970

NOTE � To use one inch filter bend tabs up as illustrated in

figure 9.

BEND ALL THREETABS

FILTERCOMPARTMENT

Figure 9. One Inch Filter Tabs

Sealing the Unit

WARNINGThere must be an airtight seal between the bottom of theair handler and the return air plenum. Use fiberglasssealing strips, caulking, or equivalent sealing methodbetween the plenum and the air handler cabinet toensure a tight seal. Return air must not be drawn from aroom where this air handler or any gas−fueled appliance(i.e., water heater), or carbon monoxide−producingdevice (i.e., wood fireplace) is installed.

Seal the unit so that warm air is not allowed from theunconditioned space into the cabinet. Warm air introducesmoisture, which results in water blow−off problems. This isespecially important when the unit is installed in anunconditioned area.

Make sure the liquid line and suction line entry points aresealed with either the provided flexible elastomeric thermalinsulation, or field provided material (e.g. Armaflex,Permagum or equivalent). Any of the previously mentionmaterials may be used to seal around the main and

auxiliary drains, and around open areas of electrical inlets.

Field Control Wiring

WARNINGElectric Shock Hazard.

Can cause injury or death.

Foil-faced insulation has conductive characteristics sim-ilar to metal. Be sure there are no electrical connectionswithin a ½" of the insulation. If the foil-faced insulationcomes in contact with electrical voltage, the foil couldprovide a path for current to pass through to the outermetal cabinet. While the current produced may not beenough to trip existing electrical safety devices (e.g.fuses or circuit breakers), the current can be enough tocause an electric shock hazard that could cause person-al injury or death.

CAUTIONUSE COPPER CONDUCTORS ONLY.

WARNINGRun 24V Class II wiring only through specified low volt-age opening. Run line voltage wiring only through speci-fied high voltage opening. Do not combine voltage in oneopening.

Wiring must conform to the current National Electric CodeANSI/NFPA No. 70, or Canadian Electric Code Part I, CSAStandard C22.1, and local building codes. Refer tofollowing wiring diagrams. See unit nameplate forminimum circuit ampacity and maximum over−currentprotection size.

Select the proper supply circuit conductors inaccordance with tables 310−16 and 310−17 in theNational Electric Code, ANSI/NFPA No. 70 or tables 1through 4 in the Canadian Electric Code, Part I, CSAStandard C22.1.

This unit is provided with knockout holes for conduit. Referto figure 10 for unit schematic wiring diagram. Refer tofigures 12 through 13 on page 14 for typical field wiring.

Separate openings have been provided for 24V lowvoltage and line voltage. Refer to the dimension illustrationof specific location.

WIRING CONNECTIONS

1. Install line voltage power supply to unit from a properlycircuit breaker.

2. Ground unit at unit disconnect switch or to an earthground.

NOTE � Connect conduit to the unit using a proper

conduit fitting. Units are approved for use only with

copper conductors. A complete unit wiring diagram is

located on the back side of the unit’s access panel.

3. Install low voltage wiring from outdoor to indoor unitand from thermostat to indoor unit.

NOTE � For proper voltages, select control wiring gauge

per the charts on page 16.

Figure 10. CBX40UHV Air Handler Unit Typical Wiring Diagram

CBX40UHV SERIES

SENSOR(CENTER SIDE−T0 −SIDE)

9−PINCONNECTOR

SECURINGSCREWS

AIR HANDLERCONTROL

AIR HANDLER CONTROLL−BRACKET MOUNTING PLATE

19 IN.(483 MM)

5−1/2 IN.(140 MM)

9−PIN CONNECTOR

ELECTRIC HEAT RELAYPART NO. 49W91

22V DIRECT CURRENT COIL

30 AMP CONTACT RATING

FASTEN THE PROBEBRACKET TO THE

PLENUM WITH TWOSELF−TAPPING SHEET

METAL SCREWS.

CONNECT WIRES TO DISCHARGE AIR SENSORTERMINAL ON AIR HANDLER CONTROL.

PLENUM

DISCHARGE SENSOR

(DAT)

TEMP RESISTANCEºF (OHMS)30 34,56640 26,10650 19,90460 15,31370 11,88480 9,29890 7,332100 5,826

DETAIL A

NOTE � EVENHEAT MODE CANNOT BE ENABLED WITH HARMONY III DUETO EACH CONTROL REQUIRING ITS OWN DISCHARGE AIR SENSOR.

THE AIR HANDLER CONTROL (AHC) HAS TWOSCREW TERMINALS MARKED DISCHARGE AIRSENSOR. THE SENSOR IS REQUIRED FOREVENHEAT OPERATION, IS FIELD−MOUNTEDAND MUST BE ORDERED SEPARATELY(CATALOG # 88K38).

DETAIL B

TEMPERATURE RESISTANCECHART

NOTE − Due to varying duct designsand airflow conditions, relocation of thedischarge sensor may be required toinsure accurate sensing.

CBX40UHV AIR HANDLER CONTROLPART NO. 50W28 or 65W70

Figure 11. Component Connections

AIR HANDLER CONTROL COMES FROM FACTORY WITH AMETAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEEFIGURE 19 FOR HEAT SECTION CONFIGURATION.

R CONNECTION REQUIRED FOR AIR CONDITIONER UNIT WITH LSOM.RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THECOMFORTSENSE 7000 WITH THE LSOM 2.

L CONNECTION WIRED ON UNITS WITH LSOM.

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION TERMINAL IS USED.

CBX40UHVCOMFORTSENSE�

7000

AIR CONDITIONERUNIT

(TWO−STAGE)

RED

BROWN

YELLOW

BLUE

BLACK

1

1

2

2

3

3

R

W3

W2

W1

O

Y1

Y2

G

DS

C

R

H

W2

W1

O

L

Y1

Y2

G

D

B

C

Y1−Y22−STAGECOMPR

R−OHEATPUMP

R−DSDEHUM

ORHARMONY

CU

T F

OR

OP

TIO

N

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE AC

DO NOT CUT ON−BOARD LINK R −O.

AIR HANDLERCONTROL

IMPORTANT � USE CARE WHEN CUTTING LINKS TOPREVENT DAMAGE TO CONTROL. SEE FIGURE 16,CBX40UHV JUMP AND LINK GUIDE FOR FURTHERDETAILS.

Figure 12. Field Wiring � Cooling Application (Non−Communicating)

CBX40UHVHEAT PUMP UNIT

(TWO−STAGE)X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOORTEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP ANDDUAL FUEL BALANCE POINTS.

COMFORTSENSE�7000

R R R

W3 H

W2W2

W1 W1 W1

OOO

LL

Y1Y1Y1

Y2Y2

GG

C C C

T

T

D

BY2

DS

O. D.SENSOR(X2658)

Y2OUTBL

1

1

CUT ON−BOARD LINK R −O.

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION TERMINAL IS USED.

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE HP

2

2

3

3 FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON HEAT PUMPTO Y2 ON CBX40UHV.

CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97)IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000WITH THE LSOM 2.


R−OHEATPUMP

R−DSDEHUM

ORHARMONY

CU

T F

OR

OP

TIO

N


Figure 13. Field Wiring � Heat Pump (Non−Communicating)

CAUTION

ELECTROSTATIC DISCHARGE(ESD)

Precautions and Procedures

Electrostatic discharge can affect electronic components. Take precautionsduring unit installation and service to protect the unit’s electronic controls.Precautions will help to avoid control exposure to electrostatic discharge byputting the unit, the control and the technician at the same electrostatic potential.Neutralize electrostatic charge by touching hand and all tools on an unpainted unitsurface before performing any service procedure

CBX40UHV SERIES

RED

YEL

BLU

BLK

BRN

COMFORTSENSE�7000 THERMOSTAT

CBX40UHV

OUTDOOR UNIT

PUR

OUTDOORSENSOR(X2658)

BLK

RED

BLK

PUR

EDA UNIT

FANRELAY

NOTES −/1\ NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM/2\ NOT REQUIRED WITH SINGLE-SPEED OUTDOOR FAN/3\ NOT REQUIRED FOR SINGLE STAGE

T

T

D

DO NOT CUT ON−BOARD LINK R −O.

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATIONTERMINAL IS USED.

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE A/C

4

4

RESISTOR KIT (CAT # 47W97) IS REQUIREDWHEN CONNECTING THE COMFORTSENSE7000 WITH THE LSOM 2.

AIR HANDLER CONTROL COMES FROM FACTORY WITH A METALJUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 19FOR HEAT SECTION CONFIGURATION..


R−OHEATPUMP

R−DSDEHUM

ORHARMONY

CU

T F

OR

OP

TIO

NIMPORTANT � USE CARE WHEN CUTTING LINKS TOPREVENT DAMAGE TO CONTROL. SEE FIGURE 16,CBX40UHV JUMP AND LINK GUIDE FOR FURTHERDETAILS.

Figure 14. Cooling Application � Humiditrol ® and Second−Stage Outdoor Fan Relay Wiring(Non−Communicating)

YELLOW

BLUE (NOT REQUIRED FOR SINGLE STAGE)

RED

BLACK

PURPLEPURPLE

BLACK

BLUE

RED

FAN RELAY (NOT REQUIREDWITH SINGLE−SPEEDOUTDOOR FAN)

OUTDOORSENSOR

(X2658)

COMFORTSENSE�7000 THERMOSTATCBX40UHVOUTDOOR UNIT


CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE A/C ONLY

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATIONTERMINAL IS USED.

T

T

BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM


R−OHEATPUMP

R−DSDEHUM

ORHARMONY

CU

T F

OR

OP

TIO

N


Figure 15. Heat Pump Application � Humiditrol ® and Second−Stage Outdoor Fan Relay Wiring(Non−Communicating)

SENSOR CONNECTIONS AND WIRINGREQUIREMENTS

The following are sensor connections and wiringrequirements for the discharge air and outdoor air sensors.

Discharge Sensor (DAT)

The Air Handler Control has two screw terminals markedDischarge Air Sensor. The sensor is REQUIRED forEVENHEAT operation and is field mounted and orderedseparately using Lennox Catalog # 88K38.

In the EVENHEAT mode, the discharge air sensor cyclesthe electric heating elements as needed to maintain the AirHandler control EVENHEAT jumper selected dischargesetpoint.

The discharge air sensor should be mounted downstreamof the electric heat elements as illustrated in figure 11,detail A. It must be placed in a location with unobstructedairflow, where other accessories (such as humidifiers, UVlights, etc.) will not interfere with its accuracy.

Wiring distance between the Control and the discharge airsensor should not exceed 10 feet (3 meters) when wiredwith 18−gauge thermostat wire.

Outdoor Air Sensor

This is a two screw terminal for connection to a LennoxX2658 outdoor temperature sensor. The Control takes noaction on the sensor status other than to communicate thetemperature to the RSBus network. Wiring distancebetween the AHC and outdoor temperature sensor shouldnot exceed 200 feet when wired with 18−gauge thermostatwire.

� Minimum temperature: −40ºF (−40ºC)

� Maximum temperature: 70ºF (158ºC)

AIR HANDLER CONTROL 9−PIN CONNECTOR (P8)

1. Air Handler (no electric heat) � Two wire factoryharness (wired to pins 7 and 8) which provides 230VAC power to Air Handler Control.

2. Air Handler (with electric heat) � Eight wire factoryharness (all pin position are wired as noted in table 7).

NOTE � See figure 11, detail B for wire colors.

Table 7. Electric Heat Connection (P8)

Position Function / Description

1 Heat stage 1 relay coil


3 Relay coil return




7 L1 230VAC supply from heater kit

8 L2 230 VAC supply from heater kit

9 Not Used

CONTROL CONNECTIONS AND WIRINGREQUIREMENTS

This sections provides information on communicating andnon−communicating control connections and wire runlengths.

Table 8. Air Handler Control Connections �Communicating

Label Label Function

Thermostat

R 24VAC

i+ RSbus data high connection

i− RSbus data low connection

C 24VAC command (ground)

Outdoor Unit

R 24VAC

i+ RSbus data high connection

i− RSbus data low connection

C 24VAC command (ground)

Linki+

Not used.i−

Table 9. Run Length � Communicating

Wire Run Length AWG # Insulation/Core Types

Maximum length of wiringfor all connections on theRSBus is limited to 1500feet (457 meters).

18

Color−coded, temperaturerating 95ºF (35ºC) minimum,solid core. (Class II RatedWiring)

Table 10. Air Handler Control Connections �Non−Communicating

Label Function

W1 First−stage heating demand.

W2Second stage heating demand. W1 input must be active torecognize second stage heat demand. .

W3Third stage heating demand. W1 and W2 inputs must beactive to recognize third stage heat demand.

G 24VAC signal indicates the presence of a demand.

Y1 andY2

First and second stage cooling inputs.

C 24VAC common.

R 24VAC power.

DH Use in communicating system only

H 24VAC output for humidification.

L Use in communicating system only

OReversing Valve input. (Energized by thermostat in coolingmode.)

DSBlower speed control input for Harmony Zoning or thermo-stat de−humidification control.

Table 11. Run Length � Non−Communicating

Wire Run Length AWG # Insulation/Core Types

Less than 100’ (30m) 18 Color−coded, temperaturerating 95ºF (35ºC) minimum,solid core. (Class II RatedWiring)More than 100’ (30m) 16

CBX40UHV SERIES

OUTDOORAIR SENSOR

HEAT

1 2 3 4

COOL

1 2 3 4

DELAY

1 2 3 4

ADJUST

NORM + −

HUMIDIFICATION

SMART AUTO

EVENHEAT

1 2 3 4

BLOWERONLY CFM

100

115

130

85

Y1−

Y2

2−S

TA

GE

CO

MP

R

R−

OH

EA

T

PU

MP

R−

DS

DE

HU

MOR

C

W1

W2

G

Y2

Y1

C

R

DH

H

L

O

DS

W3

FACTORYJUMPER

FUSE 3 AMP

XFMR 24V

24 VAC

COM

3

69

1

4

7

XFMR LINE

G

7−SEGMENT LED

DE

HU

MID

IFIC

AT

ION−

HA

RM

ON

Y L

INK

(JU

MP

ER

S R

to

DS

)

HE

AT

PU

MP

LIN

K

(JU

MP

ER

S R

to

O)

2−S

TA

GE

CO

MP

RE

SS

OR

LIN

K

(JU

MP

ER

S Y

1 to

Y2)

ON−B

OA

RD

LIN

KO

PT

ION

SE

LE

CT

ION

1

CBX32MV / CBX40UHV JUMPER & LINK GUIDE

−CUT ON−BOARD LINK (SOLDER TRACE) COMPLETELYTHROUGH BOTH LAYERS ON THE CONTROL BOARD1

COOLING BLOWER RAMPING

DELAYPROFILE #3

OFF−82%−100%−OFF

CLG

HP

DELAYPROFILE #2

DELAYPROFILE #1

OFF−100%−OFF

DELAYPROFILE #4

OFF−50%−82%−100%−50%−OFF

*(COOLING MODE UNLESS NOTED)

1 2 3 4

1 2 3 4

1 2 3 4

1 2 3 4

*

HUMIDIFICATION MODE

SMART MODE− ”H” ENABLED WHEN

HEAT ACTIVE (HP or ELECT. HT)

AUTO MODE − ”H” ENABLED WHEN

BLOWER ACTIVE & NO CLGOR DEHUM

HUMIDIFICATION MODE24VAC OUTPUT ON ”H”FOR HUMIDIFIER OR

ACCESSORY INTERLOCK

SMARTAUTO

SMARTAUTO

FACTORY DEFAULT SETTING*

COOLING MODEBLOWER SPEED

HIGHSPEED

MEDIUM−LOWSPEED

LOWSPEED

1 2 3 4

MEDIUM−HIGHSPEED

*

1 2 3 4

1 2 3 4

1 2 3 4

(COOLING & HP MODE)

STANDARD HEAT MODE

(STAGED BY TSTAT)

STANDARD HEAT MODE(DEFAULT)

8511

011

513

0

HEATING MODEBLOWER SPEED

*

(ELECTRIC HT MODE)

1 2 3 4

1 2 3 4

1 2 3 4

1 2 3 4

LOWSPEED

MEDIUM−LOWSPEED

MEDIUM−HIGHSPEED

HIGHSPEED

NORM+ −

NORM+ −

NORM+ −

BLOWERADJUST SELECTION

NORMAL

(+ 10%) SETTING

(−10%)SETTING

*

*

EVENHEATER MODE

85DEGREE TARGET

DISCHARGETEMPERATURE

100DEGREETARGET

115DEGREETARGET

130DEGREETARGET

8511

011

513

0

−ENABLED WITH OPTIONALDISCHARGE AIR SENSOR

8511

011

513

0

8511

011

513

0

8511

011

513

0

PUSHBUTTON

HIGHSPEED(100%)

MEDIUM−HIGHSPEED(70%)

LOWSPEED(28%)

* MEDIUM−LOW

SPEED(38%)

1 2 3 4

1 2 3 4

1 2 3 4

1 2 3 4

CONTINUOUS FANBLOWER SPEED

IMPORTANT: USE CARE WHEN CUTTING LINKS TOPREVENT DAMAGE TO CONTROL.

2

58

P8

L1L2

L2 L1INDOORBLOWERPOWER

EARTH

INDOOR BLOWERSIGNAL4 5 6

1 2 3

A92INTEGRATEDCONTROL

OUTDOOR UNITLINK

I + I −I + I −R C

I + I −R CTHERMOSTAT

HUMIDITROL

DH

DISCHARGEAIR SENSOR

HA

RM

ON

Y

R−

DS

DE

HU

Mor

NO HARMONY ZONINGOR NO

COMFORTSENSE 7000W/ DS CONNECTION

DO NOT CUT

HARMONY ZONINGOR

C0MFORTSENSE 7000W/ DS CONNECTION

CUT LINK

HA

RM

ON

Y

R−

DS

DE

HU

Mor

HA

RM

ON

Y

1

A/C UNIT HEAT PUMP UNIT

R−

0H

EA

TP

UM

P

R−

0H

EA

TP

UM

P

1DO NOT CUT CUT LINK

2 S

TA

GE

CO

MP

R

1−STG COMPRESSOR 2−STG COMPRESSOR

Y1−

Y2

1DO NOT CUT CUT LINK

*

*

*

2 S

TA

GE

CO

MP

R

Y1−

Y2

OFF−100%−100%−OFF

OFF−30sOFF−100%−100% OFF

Figure 16. Air Handler Configuration

Air Handler Control Button, Display andJumpers

Use figure 16 as reference for jumper settings. If any of thereference jumpers are missing, the Air Handler Control willdisplay Error Code 130 as per table 10, and the Air HandlerControl will automatically use the factory default settingshow in figure 16)

IMPORTANTBefore changing any clippable links or jumper settings,make sure the motor has completely stopped. Anychanges will not take place while the motor is running.

PUSH BUTTON

An on−board push button is provided for the purpose ofplacing the Air Handler Control in different operationmodes and can be used to recall stored error codes. Whenbutton is pushed and held, Air Handler Control will cyclethrough a menu of options depending on current operatingmode. Every three seconds a new menu item will bedisplayed. If the button is released while that item is shownon the display, Air Handler Control will enter displayedoperating mode, or execute defined operation sequencefor that menu option. Once all items on menu have beendisplayed the menu resumes from the beginning (if buttonis still held).

JUMPERS

Jumpers are used for non−communicating mode only.

1. Humidification � Controls the status of H terminalon the thermostat block. Configurations are as follows:

� If jumper is installed in SMART Humidificationposition (Default), H terminal is active if heatdemand is present and indoor blower isrunning.

� If jumper is installed in AUTO Humidificationposition, H terminal is energized wheneverindoor blower is running.

2. EvenHeat � Target Discharge Air Temperatureselection is used to set discharge air temperatures forEvenHeat operation.

NOTE − Optional Discharge Air Temperature Sensor,

Lennox Catalog # 88K38 is REQUIRED for EVENHEAT

operation and must be ordered separately.

3. Blower Only CFM � Used to select Indoor blowerCFM for continuous operation.

4. Heat � Used to select Indoor blower CFM forelectrical heat by placing the jumper in proper position.Actual CFM values for different air handler sizes areshown in tables 15 through 19.

5. Cool � Used to select cooling indoor blower CFM byplacing the jumper in proper position. Actual CFMvalues for different air handler sizes are shown intables 15 through 19

6. Adjust − Used to select the indoor blower CFMadjustment value by placing the jumper in appropriateposition.

� If NORM is selected, indoor blower runs atnormal speeds.

� If + is selected, indoor blower runs atapproximately 10% higher speed than NORMsetting.

� If − is selected, indoor blower runs atapproximately 10% lower speed than NORMsetting.

If the jumper is missing, the Air Handler Control will

activate the Configuration Jumper is Missing alarm

in and will automatically use the default factory

setting in table 10. See figure 16 for jumper

configurations. Actual CFM values for different air

handler sizes are shown in tables 15 through 19.

7. Delay � Indoor blower cooling profile, delay forcooling and heat pump operations.

� When operating a heat pump, delay profiles 1and 2 are only applicable.

� When operating a heat pump, and profiles 3and 4 are selected, the Air Handler Control willdefault to profile 1.

If the jumper is missing, the Air Handler Control will

activate the Configuration Jumper is Missing alarm

and will automatically use the default factory setting

in table 10. See figure 16 for jumper configurations.

Delay Profile 1

A. When cool or heat demand is initiated, motorramps up to 100% and runs at 100% until demandis satisfied.

B. Once demand is met, motor ramps down to stop.

A

B

OFFOFF

100%CFM

COOLING DEMAND

Delay Profile 2

Cooling � Air Conditioner and Heat Pump:

A

B C

OFFOFF100% CFM 100% CFM

COOLING

DEMAND45 SEC.

A. When cool demand is initiated, motor ramps up to100% and runs at 100% until demand is satisfied.

B. Once demand is met, motor runs at 100% for 45seconds.

C. Motor ramps down to stop.

Heating � Heat Pump only:

OFFOFF100% CFM 100% CFM

HEATING DEMAND

45 SEC.30 secdelay

A B

C D

CBX40UHV SERIES

A. When heat demand is initiated, 30 seconds motoron delay starts

B. After the motor on delays expires, motor ramps upto 100% and runs at 100% until demand issatisfied.

C. Once demand is met, motor runs at 100% for 45seconds.

D. Motor ramps down to stop.

Delay Profile 3

OFFOFF 82%CFM100% CFM

COOLING DEMAND

7 1/2 MINA

B C

A. When cool demand is initiated, motor ramps up to82%

B. Motor runs at 82% for approximately 7.5 minutesand then ramp up to 100% (unless the demandhas been satisfied) and motor runs at 100% untildemand is satisfied.

C. Once demand is met, motor ramps down to stop

Delay Profile 4

OFFOFF

1/2 MIN50% CFM

COOLING DEMAND

7 1/2 MIN82% CFM

100%

CFM1/2 MIN50% CFM

B

A

CD E

A. When cool demand is initiated, motor ramps up to50%

B. Motor runs at 50% for 30 seconds and ramps up to82%

C. Motor runs at 82% for approximately 7.5 minutesand then ramp up to 100% (unless the demandhas been satisfied) and motor runs at 100% untildemand is satisfied.

D. Once demand is met, motor runs at 50% for 30seconds.

E. Motor ramps down to stop

AHC CHARACTER DISPLAY

An on−board single character LED display (see figure 16for LED display location) indicates general system statusinformation such as mode of operation, indoor blower CFMand error codes. Multi−character strings are displayed withcharacter ON for one second, OFF for 0.5 seconds andone second pause between the character groups.

Table 12. AHC System Status Codes

AHC Single CharacterDisplay

Action

Letter or NumberUnit Size Code (number or letter) displayed represents air handler model size and capacity. See Configuring Unit SizeCodes in figure 18.

��

If three horizontal bars are displayed, AHC does not recognize air handler model size and capacity. See ConfiguringUnit Size Codes in figure 18.

.

Idle mode (decimal point / no unit operation)

� Delivered CFM. Example: ��

� Stage Cooling (Shows active cooling stages) �� or ��

� Dehumidification mode (Unit in dehumidification mode only)

� � Shown only while in active defrost (Y, W and O call)

� Stage heating (Shows number of active electric heat pilot relays) �� or �� or �

� Stage heat pump (shows active heat pump stages) � or �

� Discharge air sensor temperature (indoor blower must be operating) ��

Table 13. AHC Configuration, Test and Error Recall (Fault and Lockout) Function

NOTE � AHC MUST BE IN IDLE MODE)

Single Character LEDDisplay

Action

Solid Push and hold button until solid appears, release button. Display will blink.

Blinking Push and hold button until required symbol displays. � � or

CONFIGURING ELECTRIC HEAT SECTIONS

Solid Release push button − control will cycle the indoor blower motor on to the selected heat speed and stage the electricheat relays on and off to automatically detect number of electric heat sections. Control will store the number of electricheat sections. Control will automatically exit current active mode.

INDOOR BLOWER TEST

Solid �Release push button − control cycles indoor blower on for ten seconds at 70% of maximum air for selected capacitysize unit. Control will automatically exit current active mode.

CONFIGURING UNIT SIZE CODES

Single Character LEDDisplay

Action

Solid �

RELEASE push button − This mode allows the field to select a unit size code (number or letter) that matches the airhandler model size and capacity.

IMPORTANT � All field replacement controls may be manually configured to confirm air handler model sizeand capacity.

Blinking �

1. When the correct Unit Sized Code is displayed, RELEASE push button. Selected code will flash for 10 secondperiod.

2. During ten second period, HOLD push button until code stops blinking (three seconds minimum).

3. Air Handler Control will store code in memory and exit current active mode. LED display will go blank and thenthe Unit Size Code will display for 2 to 5 seconds.

NOTE − If ten second period expires, or push button is held less than 3 seconds, control will automatically exit current

active mode and go into IDLE Mode without storing unit size code. If this occurs, then Unit Size Code configuring

procedure must be repeated.

ERROR CODE RECALL MODE (NOTE � CONTROL MUST BE IN IDLE MODE)

Solid �To enter Error Code Recall Mode � PUSH and HOLD button until solid E appears, then RELEASE button.

Control will display up to ten error codes stored in memory. If E000 is displayed, there are no stored error codes.

Solid

��

To exit Error Code Recall Mode � PUSH and HOLD button until solid three horizontal bars appear, thenRELEASE button.

NOTE − Error codes are not cleared

Solid To clear error codes stored in memory, continue to HOLD push button while the three horizontal bars are displayed.Release push button when solid c is displayed. Display will blink.

Blinking Push button to confirm command to delete codes. Error codes are cleared.

CBX40UHV SERIES

Table 14. AHC Single Character Display � Error Codes (Communicating and Non−Communicating)

Error Codes Status of Air Handler

� �� Equipment is unable to communicate. Indicates numerous message errors. In most cases errors are related to electrical noise.

� �� Possible issue with main power frequency (control requires 60 Hertz power).

� �� Low 24 volts (18 or less volts) − Control will restart if the error recovers.

� �� Usually caused by delay in outdoor unit responding to indoor unit.

� ��Active Subnet Controller Missing for > 180 seconds. This indicates a data connection has been lost between a communicatingdevice and the communicating thermostat. Device (indoor or outdoor unit) sends the alarm if no communication is established be-tween device and thermostat within three minutes.

� �� Configuration jumper(s) is missing on AHC.

� �� Non−volatile data corruption.

� �� Recycle power. If failure re−occurs, replace AHC. System reset is required to recover.

� �� Outdoor air temperature sensor (OAS) out of range.

� �� Indoor Blower communication failure − (includes indoor blower power outage)

� ��Incorrect air handler model size and capacity selected or wrong motor. Check for proper configuring under Configuring Unit SizeCodes.

� �� No air handler model size and capacity selected. Check for proper configuring under Configuring Unit Size Codes.

� �� Indoor blower motor unable to start (seized bearing, stuck wheel, etc.).

� �� Indoor blower motor over temperature (motor trip on internal protector)

� ��Discharge air sensor (DATS) out of range, open or shorted. Code is only active in evenheat mode setting or on communicatingsystems with icomfort room thermostat.

� �� Restricted airflow � Indoor blower motor is running at a reduced CFM (cutback mode **)

� �� Indoor and outdoor unit capacity mismatch.

� ��Global network connection error. This usually indicates there is a short or overladed resistance is to low) condition between com-municating indoor and thermostat units.

� �� Second−stage cooling link not cut. AHC Y1−Y2 link not cut for non−communicating heat pump.

� �� Heat pump link not cut. AHC R−O link not cut for non− communicating heat pump. Only on AHC Rev 2.4 or earlier.

� �� Relay Y1 failure. AHC relay activated, but not respond back .

� �� Relay Y2 failure. AHC relay activated, but not respond back .

� �� Heat call with non−configured or mis−configured electric heat. Check for proper configuring under Configuring Electric Heat Stages.

� �� Heat section / Stage 1 failed (Pilot relay contacts did not close or the relay coil in electric heat did not energizing)

� �� Heat section / Stage 2 failed.




� �� When in icomfort® mode with non−communicating HP, defrost cycle running greater than 20 minutes in duration.

Error codes 401 through 409 are only displayed when the AHC L terminal is connected to a non−communicating outdoor unit’s LSOM device..

� �� Compressor ran more than 18 hours in air conditioning mode.

� �� Compressor system pressure trip.

� �� Compressor short−cycling − running less than four minutes.

� �� Compressor rotor locked.

� �� Compressor open circuit.

� �� Compressor open start circuit.

� �� Compressor open run circuit.

� �� Compressor contactor is welded.

� �� Compressor low voltage.

** Cutback Mode � The variable speed motor has pre−set speed and torque limiters to protect the motor from damage caused by operating out of itsdesigned parameters (0 through 0.80 in. w.g. total external static pressure).

Target CFM Tables

Table 15. CBX40UHV−024 CFM Targets

COOL/HEAT PUMP TABLE (C00L) ELECTRIC HEAT TABLE (HEAT)

JUMPER SELECTION JUMPERS SELECTION

1 2 3 4 (ADJUST) 1 2 3 4 (ADJUST)

465 690 900 1050 �+" 715 855 1000 1130 �+"

425 620 825 950 NORM 670 770 900 1035 NORM

385 560 735 850 �−" 580 700 800 930 �−"

Low Cool CFM = 70% of Cool table.




1 2 3 4 (ADJUST) 1 2 3 4 (ADJUST)

660 880 1100 1320 �+" 800 935 1070 1210 �+"

600 800 1000 1200 NORM 725 850 975 1100 NORM

540 720 900 1080 �−" 580 765 880 990 �−"





1 2 3 4 (ADJUST) 1 2 3 4 (ADJUST)

1090 1225 1380 1545 �+" 1230 1335 1445 1545 �+"

975 1125 1275 1400 NORM 1120 1215 1315 1400 NORM

900 1000 1135 1265 �−" 1010 1185 1200 1265 �−"





1 2 3 4 (ADJUST) 1 2 3 4 (ADJUST)

1100 1320 1540 1760 �+" 1100 1320 1540 1760 �+"

1000 1200 1400 1600 NORM 1000 1200 1400 1600 NORM

900 1080 1260 1440 �−" 900 1080 1260 1440 �−"


Table 19. CBX40UHV−048/−060 CFM Targets



1 2 3 4 (ADJUST) 1 2 3 4 (ADJUST)

1625 1820 2055 2145 �+" 1850 1960 2090 2150 �+"

1425 1625 1805 2005 NORM 1705 1800 1900 2005 NORM

1205 1375 1555 1725 �−" 1560 1625 1720 1770 �−"


CBX40UHV SERIES

Unit Operating Sequences

This section details unit operating sequence for non−communicating systems. For communicating systems, see theicomfort Touch® thermostat installation instruction.

Table 20. CBX40UHV with ComfortSense� 7000 Thermostat and Single−Stage Outdoor Unit OperatingSequence

Operating Sequence System Demand System Response

SystemCondition

Step

Thermostat Demand Relative Humidity

Comp

AirHandler

CFM(COOL)

Comments

Y1 Y2 O G W1 W2 Status D

NO CALL FOR DEHUMIDIFICATION

Normal Operation

1 On On On Acceptable 24 VAC High 100%Compressor and indoorair handler followthermostat demand

BASIC MODE (Only active on a Y1 thermostat demand)

Normal Operation

1 On On On Acceptable 24 VAC High 100%ComfortSense� 7000thermostat energizes Y1and de−energizes D on acall for dehumidification.

NOTE � No over cool-ing.

DehumidificationCall

2 On On On Demand 0 VAC High 70%

PRECISION MODE (Operates independent of a Y1 thermostat demand)

Normal Operation

1 On On On Acceptable 24 VAC High 100%Dehumidification modebegins when humidity isgreater than set pointDehumidification

call2 On On On Demand 0 VAC High 70%

Dehumidificationcall ONLY

1 On On On Demand 0 VAC High 70%

ComfortSense� 7000will keep outdoor unitenergized after coolingtemperature setpoint hasbeen reach in order tomaintain room humiditysetpoint.

NOTE � Allow to overcool 20F from cooling setpoint.

Table 21. CBX40UHV, with ComfortSense� 7000 Thermostat and Two-Stage Outdoor Unit Operating Sequence

Operating Sequence System Demand System Response

SystemCondition Step

Thermostat Demand Relative Humidity

Compr

AirHandler

CFM(COOL) CommentsY1 Y2 O G W1 W2 Status D

No Call for Dehumidification

Normal Operation− Y1

1 On On On Acceptable 24 VAC Low 70%Compressor and indoor airhandler follow thermostatdemandNormal Operation

− Y22 On On On On Acceptable 24 VAC High 100%

Room Thermostat Calls for First−Stage Cooling


Normal Operation 1 On On On Acceptable 24 VAC Low 70% ComfortSense� 7000 thermostatenergizes Y2 and de−energizes Don a call for dehumidification

NOTE � No over cooling.


2 On On On On Demand 0 VAC High 70%


Normal Operation 1 On On On Acceptable 24 VAC Low 70%Dehumidification mode beginswhen humidity is greater than setpoint

Dehumidificationcall




ComfortSense� 7000 thermostatwill keep outdoor unit energizedafter cooling temperature setpointhas been reached in order tomaintain room humidity setpoint.

NOTE � Allow to over cool 20Ffrom cooling set point.

Room Thermostat Calls for First− and Second−Stage Cooling


Normal Operation 1 On On On On Acceptable 24 VAC High 100% ComfortSense� 7000 thermostatenergizes Y2 and de−energizes Don a call for dehumidification

NOTE � No over cooling.




Normal Operation 1 On On On On Acceptable 24 VAC High 100%Dehumidification mode beginswhen humidity is greater than setpoint

Dehumidificationcall




ComfortSense� 7000 thermostatwill keep outdoor unit energizedafter cooling temperature setpointhas been reached in order tomaintain room humidity setpoint.

NOTE �: Allow to over cool 20Ffrom cooling set point.

CBX40UHV SERIES

Configuring Unit

This section identifies the requirements for configuring the air handler unit for unit size, heat mode selection and EvenHeat.

Air Handler Control Checkout

Power−up � Unit Size Code (Number or letter) displayed represents air handler model size and capacity. Ifthree horizontal bars displays, Air Handler Control (AHC) does not recognize unit size code (air handlermodel size and capacity).

AHC recognizesUnit Size Code?

Electricheat

Installed?

Finished

Which Heat Mode?

Refer to EVENHEAT Operation flow diagram, Air Handler orECB40 Electric Heat installation instructions.

W1 Call?

YesNo

Yes

No (DisplayAlarm Code

203)

Standard EVENHEAT

Refer to Heat Pump or CoolingSequence of Operation flowdiagrams, Air Handler or ECB40Electric Heat installationinstructions.

A call for electric heating first, second or third stage isinitiated when 24 VAC (R) is detected on W1, W2 and W3inputs on AHC. (Factory mounted metal jumpers connectW1/2 and W2/W3.)

At the completion of each heat section demand (W1, W2,and W3), the AHC will immediately de−energize thecorresponding pilot relay(s).

At the completion of all heating demands, the indoorblower will run for an additional 10 seconds beforede−energizing.

No

Yes

NOTE − If the call for lower heat section is removed, AHCwill automatically de−energize higher heat sections.

Indoor blower will immediately start to delivery CFM asset by heating mode jumper on AHC with activation offirst electric heat pilot relay.

Pilot relays on AHC are energized one at a time. Thereis a minimum of 10 seconds delay between pilot relayactivations.

After all electric heat installations, AHC must bemanually configured to detect number of heat sections.Refer to Configuring/Detecting electric heat sectionsflow diagram, Air Handler or ECB40 Electric Heatinstallation

IMPORTANT � Field replacement AHC may need to be manuallyconfigured to validate air handler unit size code.

Refer to Configuring Unit Size Codes flow diagram, Air Handler or ECB40Electric Heat installation instructions.

ONE (H1)

H1

TWO (H1−H2)

H1

H2

H2

THREE (H1−H3)

H1

H2

H3

FOUR (H1−H4)

H1 AND H2

H3

H4

FIVE (H1−H5)

H1 AND H2

H3 AND H4

H5

T−STAT CALL

W1

W2

W3

NUMBER OF HEAT SECTIONS DETECTED

NOTE � AHC will not recognize higher heat sectionscalls if lower heat section is not present.

��

RECOMMEND � USE FIGURE 16 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

Figure 17. Air Handler Control Checkout

Configuring Unit Size Codes (Model Number)

Power−up � Unit Size Code (number or letter) displayed represents unit size code (air handler model size and capacity).If three horizontal bars display, then Air Handler Control (AHC) does not recognize unit size code.

AHC in IDLE mode (No heating, cooling or indoor fan operation)

To enter unit size codeconfiguration mode, PUSH and

HOLD button next to singlecharacter LED display until dash

symbol appears, RELEASE button.

Turn room thermostat toOFF

PUSH and HOLD button until the solid Psymbol is displayed on the single

character LED display, then RELEASEbutton. This mode allows the user to

select a unit size code (number or letter)that matches the air handler model size

and capacity.

Solid dash starts blinkingon single character LED

display.

Solid P startsblinking on single

character LEDdisplay.

PUSH and HOLD button to allow AHC to display unit sizecode (letter or number) for each different air handler modelfor three seconds.

Yes No

IMPORTANT � Field replacement AHC may need to be manuallyconfigured to validate air handler unit size code.

��

�

�

�

�

AIR HANDLERMODEL

CBX32MV−018/024

CBX32MV−024/030

CBX32MV−036

CBX32MV−048

CBX32MV−060

CBX32MV−068

CBX40UHV−024

CBX40UHV−030

CBX40UHV−036

CBX40UHV−042

CBX40UHV−048

CBX40UHV−060

UNIT SIZE CODE

0

1

2

3

4

5

6

7

8

9

L

U

1. When the correct Unit Sized Code is displayed, RELEASE

push button. Selected code will flash for 10 second period.

2. During that 10 second period, HOLD push button until code

stops blinking (three seconds minimum).

3. Air Handler Control will store code in memory and exit current

active mode. LED display will go blank and then the Unit Size

Code will display for 2 to 5 seconds.

NOTE − If 10 second period expires, or push button is held less than

three seconds, AHC will automatically exit current active mode and

go into IDLE Mode without storing unit size code. If this occurs, then

Unit Size Code configuring procedure must be repeated.

LED displays correctUnit Size Code.

Unit enters IDLEMode.

YESNO

Figure 18. Configure Unit Size Codes

CBX40UHV SERIES

Configuring/Detecting Electric Heat Sections

IMPORTANT � All electric heat installations require the Air Handler Control (AHC) to be manuallyconfigured to detect number of heat sections.

Which Heat Mode?

� Set desired Heating Mode Blower Speed jumperpin.

Configuration

Standard EVENHEAT

AHC in Idle Mode (No heating cooling orindoor fan operation)

To enter electric heat configurationmode, push and hold button next tosingle character LED display untildash symbol (solid bar) appears,then release button. Turn room thermostat to OFF.

Yes

Solid dashstartsblinking onsinglecharacterLED display

Push and hold button until the solid H symbol is displayed on the singlecharacter LED display, then release button.

Finished

No

NOTE � All field replacement AHC will require configuring/detecting electric heat sections.

� Electric heat is stages by room thermostat. (AHCcomes with factory jumper between W1 to W2 and W2to W3)

� Refer to Air Handler Control Checkout flow diagram foroperation.

� Set desired Heating Mode Blower Speed jumperpin.

� Install and wire discharge air temperature sensor.

� Set desired Target Discharge Temperature jumperpin. If jumper pin is missing or discharge airtemperature sensor is not detected, AHC defaults toStandard Heat Mode. Target settings are 85, 100, 115and 130ºF) .

� Refer to EVENHEAT Operation flow diagram foroperation.

1. AHC will start the indoor blower motor to the selected heat jumper speed setting and cycle the electric heat relays ON to automatically detect number of electricheat sections. (Electric heat section may be wired to energize more than one element)

2. AHC waits for maximum of ten seconds to detect electric heat 22 volt DC relay coils are energizing:

A. If relay coil current is detected within ten seconds, AHC will show a 1 on the single character LED display indicating that the first stage has been detected.As each additional heat section is detected, single character LED display on the AHC will display that electric element number. (Example: Last numberdisplayed by the single character LED display is 3, the AHC is configured to operate three electric heat sections.)

B. If relay coil current is not detected within ten seconds, the AHC will exit the current active mode and resume operation with electric heat disabled.

3. AHC will automatically exit current active mode when configuration is completed. To verify that the number of electric sections detected matches the installedelectric heat package, the field MUST CONFIRM that the last number the single character LED display before exiting the Configuring/Detection Mode matches thenumber of installed electric heat sections. AHC stores the number of electric heat stages in non−volatile memory.

4. After the detection is finished, unit will continue to operate for an additional 30 seconds.

�

��

NOTE � If AHC push button is pushed or power is cycled on AHC is unable to verify all 22 volt DC electric heat relay(s) were energized using electric heaterdetection, configuration will be stopped. Configuration function must be repeated.

RECOMMEND � USE FIGURE 16 AS A REFERENCE FOR SETTINGJUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

Figure 19. Heat Mode Selection

EvenHeat Operation

INPUTS OUTPUTS

Room Thermostat DemandTarget Discharge AirTemperature Set at 85ºF

Target Discharge AirTemperature Set at 100ºF

Target Discharge AirTemperature Set at 115ºF/130ºF

Y1 Heat Pump First Stage Heat Pump First StageHeat Pump First + First ElectricHeat Section (H1)

Y1 + Y2Heat Pump First and SecondStage

Heat Pump First and Second Stage+ First Electric Heat Section (H1)

Heat Pump First and Second Stage+ First Electric Heat Section (H1) +Second Electric Heat Section (H2)if number of electric heater sectionsdetected is more than two.

Y1 + W1 and/or W2Heat Pump First Stage + FirstElectric Heat Section (H1)

Heat Pump First Stage + First Elec-tric Heat Section + Second ElectricHeat Section (H2) if number ofelectric heater sections detected ismore than two.

Heat Pump First Stage + First Elec-tric Heat Section (H1) SecondElectric Heat Section (H2) if num-ber of electric heater sections de-tected is more than two.

Y1 and Y2 + W1 and/or W2Heat Pump First and SecondStage+ First Electric Heat Section(H1)

Heat Pump First and Second Stage+ First Electric Heat Section + Sec-ond Electric Heat Section (H2) ifnumber of electric heater sectionsdetected is more than two.

Heat Pump First and Second Stage+ First Electric Heat Section (H1)Second Electric Heat Section (H2)if number of electric heater sectionsdetected is more than two.

W1 and/or W2 First Electric Heat Section (H1)

First Electric Heat Section (H1) +Second Electric Heat Section (H2)if number of electric heater sectionsdetected is more than two.

First Electric Heat Section (H1) +Second Electric Heat Section (H2)if number of electric heater sectionsdetected is more than two.

Heat pump first or second stage or electric heat demand will start the Air HandlerControl indoor blower at CFM value based on tables found in installationinstructions.

Heat Pump and electric heat demand?

Increase target discharge air temperature by 15Fº

Last room thermostat Heatup− staging action

Timer delays for120 seconds

Timer delays for 150seconds

A

One Stage More than one stage

No

Yes

Figure 20. EVENHEAT Operation (1 of 2)

CBX40UHV SERIES

Discharge air temperature is within target range?

W call with oneElectric Heat Section ON

More Electric Heat available

A

Measured discharge air temperature is above or below

target range?

Electric heat ON

� 150 seconds if more than one stage is activated or deactivated.

Start Timer Delay (Note 1)

Stop Delay Timer

Increase heat demand. Y1 (with or without Y2) +

W1 and W2

Discharge air temperature sensor setting onAir Handler Control will remain at set point. W1demand will increase set point 15ºF. W2demand will increase set point an additional15ºF. (Total of 30ºF)

Delay Timer Finished or last change was up−

stage

Delay Timer Finished or last

change was down−stage

Above

Turn OFF OneElectric Heat Section

Adjust TargetDischarge AirTemperature

Turn ON one ElectricHeat section

Adjust TargetDischarge AirTemperature

NOTE − Optional Outdoor Thermostat (Wiredbetween R and W3) will lockout electricelements 3, 4 and 5.

No

Note 1 Activation delay

� 120 seconds if one heat stage is activated or deactivated

No

No

No

Yes

Yes

Yes

Change in Heatdemand from room

thermostat?

Adjust Target DischargeAir Temperature

Heat Pump OFF

Discharge air temperature sensor setting onthe Air Handler Control will remain at set pointon W1 demand and be increased 15ºF for W2demand.

Heat Pump ON

Yes

Yes

No

No

Yes

Below

No

No

Yes

EvenHeat Operation (continued)

Figure 21. EVENHEAT Operation (2 of 2)

Heat Pump Operation (Heating and Cooling)

Room thermostat calls for firststage?

Air Handler Control (AHC) receives inputs on Y1 terminal.

Y1 terminal on AHC is configured as input and passes signal from roomthermostat to outdoor unit.

Y1 input to the AHC will control the indoor blower according to the coolingor heating mode blower speed, ramping and adjust selection jumperpins.

Air Handler Control (AHC) receives inputs on Y1 and O terminals.


Y1 input to the AHC. Will control the indoor blower according to the coolingmode blower speed, ramping and adjust selection jumper pins.

Room thermostat calls for secondstage?

Still calling for first stage?

Y2 terminal on AHC isconfigured as input andpasses signal from roomthermostat to outdoor unit. Y2 terminal is an input to

the AHC. The indoorblower will be controlledaccording to the jumperpin selections.

Still calling for secondstage?

De−energize Y2 terminal on AHC. Indoorblower speed will reset to Y1 demand.

De−energize Y1 (and O in cooling) terminals on AHC

De−energize indoor blower per ramping profile.

No

Yes

Cooling

Air Handler Control AHC) Indoor Blower Mode Speed and Profiles settings

1. Set Cooling Mode Blower Speed jumper pin . (Low and high indoor blower CFM settings are identical forcooling and heat pump)

2. Set Blower Adjust Selection jumper pin.

3. Set Cooling Mode Blower Ramping jumper pin (Cooling calls � All ramping profiles are active). (Heating calls� Only ramping profiles 1 and 2 are active. If profiles 3 or 4 are selected, AHC will default to profile 1)

A. Profile 1 does not provide any ramping profiles.

B. Profile 2 provides a 30 second indoor blower ON delay at the start of a heat pump heating demand. (45second indoor blower OFF delay)

4. Simultaneous Heat Pump and electric heat call: Indoor Blower will operate at the highest CFM requestedby the heat pump or the electric heat blower speed selection.

Single or Two−Stage Unit

1. AHC on−board link must be cut between Y1 and Y2 to allow two stage cooling operation.

Heating

NOTE � The outdoor unit control directly controls the outdoor unitoperation.)

NOTE � The outdoor unit control directly controls the outdoor unitoperation.

NOTE � The outdoor unit control directlycontrols the outdoor unit operation.)

NOTE � The outdoor unit control directly controlsthe outdoor unit operation.

NOTE � The outdoor unitcontrol directly controls theoutdoor unit operation.)

YesYes

Yes

Yes

No

No

2. AHC on−board link must be cut between R and O to allow heat pump operation.

CUT ON−BOARD LINK Y1−Y2FOR TWO−STAGE A/C


R−OHEATPUMP

R−DSDEHUM

ORHARMONY

CU

T F

OR

OP

TIO

N


RECOMMEND � USE FIGURE 16 AS A REFERENCEFOR SETTING JUMPER CONFIGURATIONS ON THE

AIR HANDLER CONTROL.

IMPORTANT � USE CARE WHEN CUTTING LINKS TOPREVENT DAMAGE TO CONTROL. SEE FIGURE 16,

CBX40UHV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

CBX40UHV SERIES

Cooling Operation

Room thermostat calls for first stage?

Air Handler Control (AHC) receives inputs on Y1 terminal.


Y1 input to the AHC will control the indoor blower according to the coolingor heating mode blower speed, ramping and adjust selection jumper pins.

Room thermostat calls forsecond stage?

Still calling for first stage?

Y2 terminal on AHC isconfigured as input andpasses signal from roomthermostat to outdoor unit.

Y2 terminal is an input tothe AHC. The indoorblower will be controlledaccording to the jumperpin selections.

Still calling for secondstage?

NOTE � The outdoor unit control directlycontrols the outdoor unit operation.

De−energize Y1 (and O in cooling) terminals onAHC.

De−energize indoor blower per ramping profile.

No

Yes

AHC on−board link must be cut between Y1 and Y2 to allow 2 stage cooling operation.

Air Handler Control AHC) Indoor Blower Mode Speed and Profiles settings

1. Set Cooling Mode Blower Speed jumper pin.

2. Set Cooling Mode Blower Ramping jumper pin.

3. Set Blower Adjust Selection jumper pin.

Single or Two−Stage Unit

NOTE � The outdoor unit control directly controls the outdoor unitoperation.

De−energize Y2 terminal on AHC. Indoorblower speed will reset to Y1 demand.

NOTE � The outdoor unit control directlycontrols the outdoor unit operation.

NOTE � The outdoor unitcontrol directly controlsthe outdoor unit operation.

YesYes

Yes

Yes

No

No

CUT ON−BOARD LINK Y1−Y2 FORTWO−STAGE A/C


R−OHEATPUMP

R−DSDEHUM

ORHARMONY

CU

T F

OR

OP

TIO

N

RECOMMEND � USE FIGURE 16 AS A REFERENCEFOR SETTING JUMPER CONFIGURATIONS ON THEAIR HANDLER CONTROL.

IMPORTANT � USE CARE WHEN CUTTING LINKS TOPREVENT DAMAGE TO CONTROL. SEE FIGURE 16,

CBX40UHV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

Error Code / Recall Mode

To enter Error Code Mode, pushand hold button next to singlecharacter LED display until solidE symbol appears, releasebutton.

AHC in Idle Mode (No heating cooling or indoor fan

operation)

Turn room thermostat to OFF

Control will display up to ten error codes stored inmemory. If E 0 0 0 is displayed, there are no stored errorcodes.

To exit Error Code Recall Model, push and hold buttonnext to single character LED display until solid threehorizontal bars appears, then release button.

To clear error codes stored in memory,continue to hold push button while the solidthree horizontal bars are displayed. Releasebutton when solid is displayed.

Solid c starts blinking onsingle character LED

display.

The display will blink for up to ten seconds. During this time, press thebutton and release to confirm deletion of the error code history. Asconfirmation, AHC will display 0 0 0 0 . (If ten second period expires orpush button is not released, control will automatically exit Error CodeMode and go into mode without deleting error code history.

Yes No

NOTE � Once the error code history is deleted, it cannot be recovered.

NOTE � Error Codes are not cleared from memory.

�

� � � �

��

��

� � � �

CBX40UHV SERIES

Indoor Blower Test

Blower Test Mode

AHC in Idle Mode (No heating cooling or indoor fan

operation)

To enter Indoor Blower Test Mode,push and hold button next singlecharacter LED display until � (Solidbar), then release button. Turn room thermostat to OFF

(Solid bar) startsblinking on singlecharacter LED display.

Push and hold button until the solid Asymbol is displayed on the singlecharacter LED display, then releasebutton.

Control will cycle the indoor blower motor for ten seconds at 70% of maximum air for selected capacity size unit. Control will automaticallyexit Blower Test Mode.

Yes No

��

�

Checkout Procedures

NOTE − Refer to outdoor unit installation instructions for

system start−up instructions and refrigerant charging

instructions.

PRE-START-UP CHECKS

� Is the air handler properly and securely installed?

� If horizontally configured, is the unit sloped up to 1/4

inch toward drain lines?

� Will the unit be accessible for servicing?

� Has an auxiliary pan been provided under the unit with

separate drain for units installed above a finishedceiling or in any installation where condensate

overflow could cause damage?

� Have ALL unused drain pan ports been properly

plugged?

� Has the condensate line been properly sized, run,

trapped, pitched, and tested?

� Is the duct system correctly sized, run, sealed, and

insulated?

� Have all cabinet openings and wiring been sealed?

� Is the indoor coil factory-installed TXV properly sized

for the outdoor unit being used?

� Have all unused parts and packaging been disposed

of?

� Is the filter clean, in place, and of adequate size?

� Is the wiring neat, correct, and in accordance with the

wiring diagram?

� Is the unit properly grounded and protected (fused)?

� Is the thermostat correctly wired and in a good

location?

� Are all access panels in place and secure?

CHECK BLOWER OPERATION

� Set thermostat to FAN ON.

� The indoor blower should come on.

CHECK COOLING OPERATION

� Set thermostat to force a call for cooling

(approximately 5ºF lower than the indoor ambienttemperature).

� The outdoor unit should come on immediately and the

indoor blower should start between 30 − 60 seconds

later.

� Check the airflow from a register to confirm that the

system is moving cooled air.

� Set the thermostat 5ºF higher than the indoor

temperature. The indoor blower and outdoor unitshould cycle off.

CHECK ELECTRIC HEATER (IF USED)

� Set thermostat to call for auxiliary heat (approximately

5°F above ambient temperature). The indoor blowerand auxiliary heat should come on together. Allow a

minimum of 3 minutes for all sequencers to cycle on.

� Set the thermostat so that it does not call for heat.

Allow up to 5 minutes for all sequencers to cycle off.

Operation

COOLING (COOLING ONLY OR HEAT PUMP)

When the thermostat calls for cooling, 24 volts is put on theblower time−delay relay coil. After a delay, the indoorblower relay energizes. The normally open contacts close,causing the indoor blower motor to operate. The circuitbetween R and Y is completed, closing the circuit to thecontactor in the outdoor unit, starting the compressor and

outdoor fan motor.

On heat pumps, circuit R and O energizes the reversingvalve, switching the valve to the cooling position. (Thereversing valve remains energized as long as thethermostat selector switch is in the COOL position.)

At the completion of the cooling demand and after therelay’s time-delay, the compressor and outdoor fan willcycle off.

HEATING (ELECTRIC HEAT ONLY)

When the thermostat calls for heat, the circuit between Rand W is completed, and the heat sequencer is energized.A time delay follows before the heating elements and theindoor blower motor come on. Units with a second heatsequencer can be connected with the first sequencer to W

on the thermostat subbase, or they may also be connectedto a second stage on the subbase.

HEATING (HEAT PUMP)

When the thermostat calls for heating, 24 volts is put on the

blower time−delay relay coil. After a delay, the normallyopen contacts close, causing the indoor blower motor tooperate. The circuit between R and Y is completed, closingthe circuit to the contactor in the outdoor unit, starting thecompressor and outdoor fan motor. Circuit R and Genergizes the blower relay, starting the indoor blower

motor.

If the room temperature should continue to fall, the circuitbetween R and W1 is completed by the second-stage heatroom thermostat. Circuit R−W1 energizes a heatsequencer. The completed circuit will energize

supplemental electric heat (if applicable). Units with a

second heat sequencer can be connected with the firstsequencer to W1 on the thermostat. They may also beconnected to a second heating stage W2 on the thermostatsubbase.

EMERGENCY HEAT (HEATING HEAT PUMP)

If the selector switch on the thermostat is set to theemergency heat position, the heat pump will be locked outof the heating circuit, and all heating will be electric heat (ifapplicable). A jumper should be placed between W2 and E

on the thermostat subbase so that the electric heat controlwill transfer to the first-stage heat on the thermostat. Thiswill allow the indoor blower to cycle on and off with theelectric heat when the fan switch is in the AUTO position.

Maintenance

DEALER

WARNINGElectric shock hazard. Can cause injuryor death. Before attempting to performany service or maintenance, turn theelectrical power to unit OFF at disconnectswitch(es). Unit may have multiple powersupplies.

WARNINGImproper installation, adjustment, alteration, service ormaintenance can cause personal injury, loss of life, ordamage to property.

Installation and service must be performed by a licensedprofessional installer (or equivalent) or a service agency.

Maintenance and service must be performed by a qualifiedinstaller or service agency. At the beginning of eachcooling season, the system should be checked as follows:

Outdoor Unit1. Outdoor unit fan motor is pre−lubricated and sealed.

No further lubrication is needed.

2. Visually inspect all connecting lines, joints and coils forevidence of oil leaks.

3. Check all wiring for loose connections.

4. Check for correct voltage at unit (unit operating).

5. Check amp draw on outdoor fan motor.

Motor Nameplate:_________ Actual:__________.

6. Inspect drain holes in coil compartment base andclean if necessary.

NOTE - If insufficient cooling occurs, the unit should begauged and refrigerant charge should be checked.

Outdoor CoilClean and inspect outdoor coil (may be flushed with awater hose). Ensure power is off before cleaning.

NOTE � It may be necessary to flush the outdoor coilmore frequently if it is exposed to substances which arecorrosive or which block airflow across the coil (e.g., peturine, cottonwood seeds, fertilizers, fluids that may containhigh levels of corrosive chemicals such as salts)

CBX40UHV SERIES

Sea Coast � Moist air in ocean locations can carry salt,which is corrosive to most metal. Units that are locatednear the ocean require frequent inspections andmaintenance. These inspections will determine thenecessary need to wash the unit including the outdoor coil.Consult your installing contractor for properintervals/procedures for your geographic area or servicecontract.

Indoor Unit1. Clean or change filters.

2. Lennox blower motors are prelubricated andpermanently sealed. No more lubrication is needed.

3. Adjust blower speed for cooling. Measure the pressuredrop over the coil to determine the correct blower CFM.Refer to the unit information service manual for pressuredrop tables and procedure.

4. Belt Drive Blowers − Check belt for wear and propertension.

5. Check all wiring for loose connections.

6. Check for correct voltage at unit. (blower operating)

7. Check amp draw on blower motor.

Motor Nameplate:_________ Actual:__________.

Indoor Coil1. Clean coil if necessary.

2. Check connecting lines, joints and coil for evidence ofoil leaks.

3. Check condensate line and clean if necessary.

Cabinet Insulation

IMPORTANTDAMAGED INSULATION MUST BE REPAIRED ORREPLACED before the unit is put back into operation. In-sulation loses its insulating value when wet, damaged,separated or torn.

Matt- or foil−faced insulation is installed in indoorequipment to provide a barrier between outside airconditions (surrounding ambient temperature and

humidity) and the varying conditions inside the unit. If theinsulation barrier is damaged (wet, ripped, torn orseparated from the cabinet walls), the surroundingambient air will affect the inside surface temperature of thecabinet. The temperature/humidity difference between theinside and outside of the cabinet can cause condensation

on the inside or outside of the cabinet which leads to sheetmetal corrosion and subsequently, component failure.

REPAIRING DAMAGED INSULATION

Areas of condensation on the cabinet surface are anindication that the insulation is in need of repair.

If the insulation in need of repair is otherwise in goodcondition, the insulation should be cut in an X pattern,peeled open, glued with an appropriate all−purpose glueand placed back against the cabinet surface, being carefulto not overly compress the insulation so the insulation canretain its original thickness. If such repair is not possible,

replace the insulation. If using foil-faced insulation, anycut, tear, or separations in the insulation surface must betaped with a similar foil−faced tape.

1. CUT INSULATION IN X PATTERN2. APPLY GLUE3. PRESS GLUED TABS AGAINST CABINET

GLUE −make sure there isfull coverage of glue on themetal or insulation so thereare no areas where airpockets may form whichcan lead to sweating.

Figure 22. Repairing Insulation

WARNINGElectric Shock Hazard.

Can cause injury or death.

Foil-faced insulation has conductive characteristicssimilar to metal. Be sure there are no electricalconnections within a ½" of the insulation. If the foil-facedinsulation comes in contact with electrical voltage, the foilcould provide a path for current to pass through to theouter metal cabinet. While the current produced may notbe enough to trip existing electrical safety devices (e.g.fuses or circuit breakers), the current can be enough tocause an electric shock hazard that could causepersonal injury or death.

HOMEOWNER

Cleaning of the outdoor unit’s coil should be performed bya trained service technician. Contact your dealer and setup a schedule (preferably twice a year, but at least once ayear) to inspect and service your outdoor unit. Thefollowing maintenance may be performed by thehomeowner.

CAUTIONPhysical contact with metal edges and corners whileapplying excessive force or rapid motion can result inpersonal injury. Be aware of, and use caution whenworking near these areas during installation or whileservicing this equipment.

IMPORTANTSprinklers and soaker hoses should not be installedwhere they could cause prolonged exposure to theoutdoor unit by treated water. Prolonged exposure of theunit to treated water (i.e., sprinkler systems, soakers,waste water, etc.) will corrode the surface of steel andaluminum parts and diminish performance and longevityof the unit.

Outdoor Coil

The outdoor unit must be properly maintained to ensure itsproper operation.

� Please contact your dealer to schedule proper

inspection and maintenance for your equipment.

� Make sure no obstructions restrict airflow to the

outdoor unit.

� Grass clippings, leaves, or shrubs crowding the unit

can cause the unit to work harder and use moreenergy.

� Keep shrubbery trimmed away from the unit and

periodically check for debris which collects around the

unit.

Routine Maintenance

In order to ensure peak performance, your system must beproperly maintained. Clogged filters and blocked airflowprevent your unit from operating at its most efficient level.

1. Air Filter � Ask your Lennox dealer to show youwhere your indoor unit’s filter is located. It will be eitherat the indoor unit (installed internal or external to thecabinet) or behind a return air grille in the wall orceiling. Check the filter monthly and clean or replaceit as needed.

2. Disposable Filter � Disposable filters should bereplaced with a filter of the same type and size.

NOTE � If you are unsure about the filter required for yoursystem, call your Lennox dealer for assistance.

3. Reusable Filter � Many indoor units are equippedwith reusable foam filters. Clean foam filters with amild soap and water solution; rinse thoroughly; allowfilter to dry completely before returning it to the unit orgrille.

NOTE � The filter and all access panels must be in placeany time the unit is in operation.

4. Electronic Air Cleaner � Some systems areequipped with an electronic air cleaner, designed toremove airborne particles from the air passing throughthe cleaner. If your system is so equipped, ask yourdealer for maintenance instructions.

5. Indoor Unit � The indoor unit’s evaporator coil isequipped with a drain pan to collect condensateformed as your system removes humidity from theinside air. Have your dealer show you the location ofthe drain line and how to check for obstructions. (Thiswould also apply to an auxiliary drain, if installed.)

Thermostat Operation

See the ComfortSense® 7000 or icomfort Touch®

thermostat homeowner manual for instructions on how tooperate your thermostat.

Preservice Check

If your system fails to operate, check the following beforecalling for service:

� Verify room thermostat settings are correct.

� Verify that all electrical disconnect switches are ON.

� Check for any blown fuses or tripped circuit breakers.

� Verify unit access panels are in place.

� Verify air filter is clean.

� If service is needed, locate and write down the unit

model number and have it handy before calling.

Accessories

For update−to−date information, see any of the followingpublications:

� Lennox CBX40UHV Engineering Handbook

� Lennox Product Catalog

� Lennox Price Book

INSTALLATION INSTRUCTIONS - Lennox€¦ · horizontal left− and right−hand unit dimensions...

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