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THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
NOTICE
A thermostat is not included and must be ordered
separately.
• A Lennox communicating thermostat must be used in
communicating applications.
• In non-communicating applications, the Lennox
ComfortSense® thermostat may be used, as well as
other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field
wiring
for
both
communicating applications is illustrated in diagrams,
which begin on page 4.
WARNING
Every working procedure that affects safety means shall
only be carried out by competent persons. This appliance
is not to be used by persons (including children) with
reduced physical, sensory or mental capabilities, or
lack of experience and knowledge, unless they have
been given supervision or instruction concerning use of
the appliance by a person responsible for their safety.
Children should be supervised to ensure they do not
play with the appliance.
CAUTION
Leak Detection System installed. Unit must be powered
except for service.
WARNING
Maximum Altitude of application is 3200m above sea
level.
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Disponible en Français sur le LennoxPros.com site
©2024 Lennox Industries Inc.
Dallas, Texas, USA
communicating
and
non-
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection CBK48MVT Units - R454B
MULTI-POSITION AIR HANDLERS
508444-01
06/2024
Table of Contents
General Information .......................................................2
Shipping and Packing List .............................................3
Field Control Wiring .......................................................4
Target CFM Tables ......................................................16
Requirements ..............................................................18
Upflow and Downflow Unit Dimensions .......................19
Installation Clearances ................................................21
Installing the Unit .........................................................21
Sensor Connections and Wiring Requirements............27
Sensor / Bracket Installation .........................................31
Brazing Connections ...................................................33
Installing the Condensate Drain ..................................35
Condensate Drain.........................................................36
Sealing the Unit ...........................................................37
Unit Operating Sequences ..........................................38
Heat Pump Operation (Heating and Cooling) ..............45
Cooling Operation ........................................................46
Error Code / Recall Mode ............................................47
Indoor Blower Test .......................................................48
Operation .....................................................................48
Repairing or Replacing Cabinet Insulation ..................49
Homeowner Maintenance ............................................49
Professional Maintenance ...........................................49
Sensor Maintenance ....................................................50
Decommissioning ........................................................52
NOTE - This unit is a PARTIAL UNIT AIR CON DITIONER,
complying with PARTIAL UNIT requirements of this Stan-
dard, and must only be connected to other units that have
been confirmed as complying to corre sponding PARTIAL
UNIT requirements of this Standard, UL 60335-2-40/CSA
C22.2 No. 60335-2-40, or UL 1995/CSA C22.2 No 236.
Partial units shall only be connected to an appliance suit-
able for the same refrigerant.
Ducts connected to an appliance shall not contain a
potential ignition source
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 49 in this
instruction for information.
Page 1
®
WARNING
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Related Manuals for Lennox Dave Signature CBK48MVT
Summary of Contents for Lennox Dave Signature CBK48MVT
-
Page 1: Table Of Contents
A thermostat is not included and must be ordered Brazing Connections ...........33 separately. Installing the Condensate Drain ........35 • A Lennox communicating thermostat must be used in communicating applications. Condensate Drain............36 • In non-communicating applications, the Lennox Sealing the Unit ............37 ComfortSense®... -
Page 2: General Information
This indoor unit with all-aluminum coil is designed for pability of communicating with the communicating thermo- installation with optional field-installed electric heat and stats and communicating outdoor units using the Lennox a matched outdoor unit that is charged with R454B re- RSBus protocols. -
Page 3: Model Number Identification
IMPORTANT INFORMATION FOR INSTALLER CHECK FOR AND REMOVE THE FOLLOWING ITEMS BEFORE OPERATING UNIT. HORIZONTAL DRAIN PAN (SEE REFRIGERANT LINE PLUGS (SEE BLOWER HOUSING SUPPORT PAD. BRAZING CONNECTION ON PAGE 9) . UPFLOW APPLICATIONS ON PAGE 5 AND DOWNFLOW APPLICATIONS ON PAGE 8 ) NOTE: The CBK48MVT Air Handler Control (AHC) is enhanced to automatically configure (set-up) the electric heat when the ECB48 electric heat harness is... -
Page 4: Field Control Wiring
Electrical wiring, disconnect means and over-current pro- Field Control Wiring tection are to be supplied by the installer. Refer to the air handler rating plate for maximum over-current protection, WARNING minimum circuit ampacity, as well as operating voltage. Select the proper supply circuit conductors in accordance Electric Shock Hazard. - Page 5 The power supply must be sized and protected according WARNING to the specifications supplied on the product. This air handler is factory-configured for 240 volt, single Electrically ground air handler. Connect phase, 60 cycles. For 208-volt applications, see “208 Volt ground wire to ground terminal marked Conversion”...
- Page 6 CUT SIZE: 7-3/8" WIDE x 9-3/4" TALL RECOMMENDED BLOWER SPEED TAP SELECTION SPEED TAP SELECTION COOL HEAT DESCRIPTION HEAT CONDENS- HEAT CONDENS- COMPONENT PUMP WITH ING UNIT PUMP ING UNIT WITH CONTROL-INTEGRATED ELECTRIC ELECTRIC MOTOR-BLOWER HEAT HEAT ONLY JACK-MOTOR,VARIABLE SPEED JACK-MOTOR,VARIABLE SPEED PIN #2 PIN #2...
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Page 7: Pin Connector
DETAIL A THE AIR HANDLER CONTROL (AHC) HAS TWO SCREW TERMINALS MARKED DISCHARGE AIR SENSOR. THE SENSOR NOTE - Due to varying duct designs IS REQUIRED FOR EVENHEAT and air flow conditions, relocation of OPERATION, IS FIELD-MOUNTED AND MUST BE ORDERED SEPARATELY the discharge sensor may be required (CATALOG # 88K38). - Page 8 AIR HANDLER CONTROL COMES FROM FACTORY WITH A COMFORTSENSE OPTIONAL METAL JUMPER BETWEEN W1 TO W2 AND W2 TO W3. SEE 7500 N.C. CONDENSATE FIGURE 21 FOR HEAT SECTION CONFIGURATION. FLOAT SWITCH WHEN A CONVENTIONAL 24V NON-COMMUNICATING THERMOSTAT IS USED WITH THE CBK48 AIR HANDLER, THE FLOAT SWITCH MUST BE WIRED TO BREAK "Y1 COMPRESSOR DEMAND"...
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Page 9: Outdoor Unit
N.C. CONDENSATE REMOVE FACTORY-INSTALLED FLOAT SWITCH JUMPER ON FLOAT SWITCH TERMINALS WHEN INSTALLING OPTIONAL DISCHARGE AIR A FLOAT SWITCH SENSOR (SEE DAS NOTE ON PAGE 7) SOR (SEE OAS NOTE ON PAGE 7) THERMOSTAT AIR HANDLER (AHC) OUTDOOR UNIT (AC OR HP) ALL CONNECTIONS ON THE RSBUS ARE LIMITED TO 1500FT. -
Page 10: Air Handler Control Button, Display And Jumpers
• If jumper is installed in AUTO Humidification posi- Air Handler Control Button, Display and tion, H terminal is energized whenever indoor blow- Jumpers er is running. Use figure 20 as a reference for jumper settings. If any of 2 - EvenHeat – Target Discharge Air Temperature the referenced jumpers are missing, the Air Handler Con- selection is used to set discharge air temperatures for EvenHeat operation. - Page 11 Delay Profile 2 A - When cooling demand is initiated, motor ramps up Cooling – Air Conditioner and Heat Pump to 82%. B - Motor runs at 82% for approximately 7.5 minutes and then ramps up to 100% (unless the demand has been satisfied) and motor runs at 100% until 100% CFM 100% CFM...
- Page 12 TABLE 2. AHC Configuration, Test and Error Recall (Fault and Lockout) Function NOTE — AHC MUST BE IN IDLE MODE) Single Character LED Action Display Solid Push and hold button until solid appears, release button. Solid Press and hold Solid “-” until required symbol displays CONFIGURING ELECTRIC HEAT SECTIONS –...
- Page 13 RDS test button on the indoor unit control board. The sensor of the refrigerant detection system is of a type not suitable for use in the application. Replace the sensor with a Lennox approved replacement part. This fault The refrigerant detection system sensor...
- Page 14 TABLE 3. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (cont'd) In normal operation after control recognizes sensors, the alarm will be sent if valid tem- perature reading is lost. Compare outdoor sensor resistance to temperature/resist- The iComfort™ thermostat has found a ance charts in unit installation instructions.
- Page 15 TABLE 4. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (cont'd) Alert Alert How to Clear Priority Code The O relay on the air-handler has failed. O relay failed. Pilot relay contacts did not close or the relay coil did not energize. Re- Critical Either the pilot relay contacts did not place control.
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Page 16: Target Cfm Tables
First stage cooling air volume is 70% of COOL speed setting. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the same second-stage COOL speed selected, minimum 250 cfm. Lennox iHarmony Zoning System applications - minimum blower speed is 250 cfm. - Page 17 First stage cooling air volume is 70% of COOL speed setting. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper selectable) of the same second-stage COOL speed selected, minimum 450 cfm. Lennox iHarmony Zoning System applications - minimum blower speed is 450 cfm.
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Page 18: Requirements
NOTES – of Lennox air handler units (with or without optional elec- tric heat), MUST conform with National Fire Protection As- During cooling operation, excessive sweating may occur sociation (NFPA) standards: “Standard for Installation of if the air handler is installed in a warm and humid space. -
Page 19: Upflow And Downflow Unit Dimensions
Upflow and Downflow Unit Dimensions PIPING PLATE DETAIL 3/4 (19) (FOR UP-FLOW AND DOWN-FLOW POSITIONS) 5/8 (16) SUPPLY AIR OPENING 4 3/8 (111) 1 1/8 (29) SUCTION LINE CONDENSATE DRAINS 5/8 (16) 5/8 (16) (2) (HORIZONTAL) 3/4 (19) Return Air Opening (51) LIQUID LINE 11 1/16 (281) -
Page 20: Horizontal Left- And Right-Hand Discharge Unit Dimensions
Horizontal Left- and Right-Hand Discharge Unit Dimensions 5 3/8 FILTER (137) (51) Horizontal Position LIQUID LINE (Right Hand Air SUCTION CONDENSATE Discharge) LINE DRAINS (2) (UP-FLOW Coil BLOWER 1 1/8 DOWN-FLOW) (29) CONDENSATE 4 3/8 DRAINS (2) (111) FOR DIMENSIONS “A” THROUGH (HORIZONTAL) “H”, SEE CHART ON PAGE 2. -
Page 21: Installation Clearances
CAUTION Installing the Unit As with any mechanical equipment, contact with sharp WARNING sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and To prevent serious injury or death: protective clothing. 1. Lock-out/tag-out before performing maintenance. 2. - Page 22 • Pipe-work including piping material, pipe routing, and ceptable for all refrigerant systems. Electronic leak de- installation shall include protection from physical dam- tectors may be used to detect refrigerant leaks but, in age in operation and service, and be in compliance with the case of flammable refrigerants, the sensitivity may national and local codes and standards not be adequate, or may need re-calibration.
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Page 23: Upflow Application
5 - Install units that have no return air plenum on a plenums as required. stand that is at least 14" from the floor to allow for proper air return. Lennox offers an optional upflow UP-FLOW / DOWN-FLOW HORIZONTAL DRIP SHIELD (-060 MODELS) DRAIN PAN unit stand as listed in table 5. - Page 24 IMPORTANT 1/2" SCREWS MAXIMUM ELECTRICAL INLET CLEARANCE 4" (102 mm) ANGLE IRON OR When removing the coil, there is possible danger of SHEET METAL equipment damage and personal injury. Be careful when removing the coil assembly from a unit installed in right- or left-hand applications.
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Page 25: Downflow Application
NOTE – Be very careful when reinstalling the screws into Table 6 outlines the sizes of the various drip shields. the coil end plate engaging holes. Misaligned screws may NOTE - (-060 Model Only) Remove access panels and damage the coil. horizontal drip shield from the corrugated padding be- 7 - From the upflow position, flip cabinet 90º... - Page 26 IMPORTANT Downflow air baffles are required for -048 and -060 models only in Downflow position. Please follow the steps below for proper installation. These must be performed after the downflow conversion has taken place. DRIP SHIELD 1 - Insert downflow air baffles. Make sure longer flanges 2”...
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Page 27: Sensor Connections And Wiring Requirements
After opening has been cut, set the additive base into opening. Connect outlet air plenum to the This is a two screw terminal for connection to a Lennox additive base. Set the unit on the additive base so X2658 outdoor temperature sensor. The Control takes no... - Page 28 TABLE 9. Run Length – Communicating NOTE - See figure 3, detail B for wire colors. Wire Run Length Insulation / Core Types TABLE 7. Electric Heat Connection (P8) Position Function / Description Maximum length or wiring Color-coded, Heat stage 1 relay coil for all connections on the temperature rating 95°F Heat stage 2 relay coil...
- Page 29 . H (Output) The H terminal provides a 24VAC The L terminal is provided for connection to devices with Lennox System Operation Monitor (LSOM) capabilities. The control L (Input) interprets the fault signals and transmits them as an alarm message on the communication line. There are ten (10) identi ed LSOM fault codes.
- Page 30 2-STG COMPRESSOR 1-STG COMPRESSOR JUMPER & LINK GUIDE CUT LINK DO NOT CUT COOLING MODE HEATING MODE BLOWER SPEED BLOWER SPEED (COOLING & HP MODE) (ELECTRIC HT MODE) A/C UNIT HEAT PUMP UNIT HIGH HIGH SPEED SPEED 1 2 3 1 2 3 MEDIUM-HIGH MEDIUM-HIGH...
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Page 31: Sensor / Bracket Installation
Horizontal Left Configuration Sensor / Bracket Installation 1 - Remove sensor bracket assembly from vertical Vertical Configuration position. Do not remove sensor from bracket, and do not disconnect or reroute sensor wire from the Leak detection sensor and bracket are factory-installed for vertical installation. - Page 32 FIGURE 24 (Detail) 4 - Loop and bundle any excess sensor wire with a wire tie. FIGURE 24 Page 32...
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Page 33: Brazing Connections
WARNING Brazing Connections Danger of explosion! IMPORTANT Can cause equipment damage, injury, or Braze-free fittings must conform with UL207 or ISO14903 death. (latest edition). When using a high pressure gas such as nitrogen to pressurize a refrigeration or air Refrigerant lines must be connected by a qualified techni- conditioning system, use a regulator that can cian in accordance with established procedures. - Page 34 PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING USE A WET RAG TO PROTECT CTXV SENSING BULB WHEN BRAZING SUCTION LINE CONNECTIONS. NOTE — REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR REFRIGERANT PIPING SIZE REQUIREMENTS NOTE - Use silver alloy brazing rods with five or six percent minimum silver alloy for copper-to-copper brazing, 45 percent alloy for copper-to-brass and copper-to-steel brazing.
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Page 35: Installing The Condensate Drain
1-1/8ʺ adapter. NOTE - When installing refrigerant lines longer than 50 IMPORTANT feet, see the Lennox Refrigerant Piping Design and Fab- rication Guidelines, CORP. 9351-L9, or contact Lennox After removal of drain pan plug(s), check drain hole(s) Technical Support Product Applications for assistance. -
Page 36: Condensate Drain
METERS) LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90. PIPE NIPPLE PROVIDED IN BAG ASSEMBLY - SCH 80, 3/4” I. D. X 5” - 34K7401 (1): CUT THE PIPE IN HALF AND USE IT TO ROUTE THE MA IN DRAIN. -
Page 37: Install Condensate Drain
INSTALL CONDENSATE DRAIN NOTE - Check local codes before connecting the drain The air handler is provided with 3/4" NPT condensate line to an existing drainage system. Insulate the drain drain connections. lines where sweating could cause water damage. TEST CONDENSATE DRAIN IMPORTANT Test the drain pan and drain line after installation: Confirm primary and secondary drains are open. -
Page 38: Unit Operating Sequences
Make sure the liquid line and suction line entry points are sealed with either the provided flexible elastomeric thermal insu- lation, or field provided material (e.g. Armaflex, Permagum or equivalent). Any of the previously mentioned materials may be used to seal around the main and auxiliary drains, and around open areas of electrical inlets. Unit Operating Sequences This section details unit operating sequence for non-communicating systems. - Page 39 TABLE 15. CBK48MVT with ComfortSense™ 7500 Thermostat and Two-Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity Handler System Compre Condition Status ssor (COOL) Step Comments No Call for Dehumidi cation Normal Operation Acceptable 24 VAC - Y1 Compressor and indoor air...
- Page 40 Unit Operating Sequences (cont'd) 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.
- Page 41 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 code...
- Page 42 Con guring/Detecting Electric Heat Sections The AHC control in the air handler has been enhanced to automatically detect and con gure the electric heat when the electric heat harness is connected to the AHC control and 240 Volt power is applied. The air handler no longer requires manual detection using the push button on the AHC Control.
- Page 43 EVENHEAT OPERATION INPUTS OUTPUTS Target Discharge Air Target Discharge Air Target Discharge Air Room Thermostat Demand Temperature Set at 85ºF Temperature Set at 100ºF Temperature Set at 1 15ºF/130ºF Heat Pump First + First Electric Heat Pump First Stage Heat Pump First Stage Heat Section (H1) Heat Pump First and Second Stage + First Electric Heat Section...
- Page 44 Note 1 Activation delay EVENHEAT Operation 120 seconds if one heat stage is or deactivated 150 seconds if more than one stage is activated or deacti- vated. Start Timer Delay (Note 1) Activate Y2 Change in Heat demand from room thermostat? Delay Timer Delay Timer Finished or last...
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Page 45: Heat Pump Operation (Heating And Cooling)
Heat Pump Operation (Heating and Cooling) Air Handler Control AHC) Indoor Blower Mode Speed and Pro les settings Set Cooling Mode Blower Speed jumper pin . (Low and high indoor blower CFM settings are identical for CUT ON-BOARD JUMPER Y1-Y2 cooling and heat pump) 2-STAGE Y1-Y2 FOR... -
Page 46: Cooling Operation
Cooling Operation Air Handler Control AHC) Indoor Blower Mode Speed and Pro les settings Set Cooling Mode Blower Speed jumper pin. Y1-Y2 Set Cooling Mode Blower Ramping jumper pin. CUT ON-BOARD JUMPER Y1-Y2 FOR 2-STAGE Set Blower Adjust Selection jumper pin. TWO-STAGE COMPR Single or Two-Stage Unit... -
Page 47: Error Code / Recall Mode
Error Code / Recall Mode AHC in Idle Mode (No heating cooling or indoor fan operation) To enter Error Code Mode , Turn room thermostat to OFF push and hold button next to single character LED display until solid E symbol appears, release button. -
Page 48: Indoor Blower Test
Indoor Blower Test Indoor Blower Test Mode AHC in Idle Mode (No heating cooling or indoor fan operation) To indoor blower test mode , push and hold button next to single character LED display until — Turn room thermostat to (Solid bar), then release button. -
Page 49: Repairing Or Replacing Cabinet Insulation
(less than 50psi). If the coil cannot be cleaned using water alone, Lennox recommends use of a coil cleaner with a pH in the range of 5 to 9. The coil must be rinsed thoroughly 1. -
Page 50: Sensor Maintenance
• Have all unused parts and packaging been disposed Sensor Maintenance It is recommended to check the state of the sensor every • Is the filter clean, in place, and of adequate size? 6 months, at the beginning of each cooling and heating •... -
Page 51: Use Of Air Handler During Construction
The blower powers up. Use of Air Handler During Construction b. The electric heat powers down. Lennox does not recommend the use of its air handler unit c. The outdoor compressor powers down. during any phase of construction. Very low return air tem-... -
Page 52: Decommissioning
d) Pump down refrigerant system, if possible. Decommissioning e) If a vacuum is not possible, make a manifold so that Before carrying out this procedure, it is essential that the refrigerant can be removed from various parts of the technician is completely familiar with the equipment and system. - Page 53 Installing Contractor’s Name_______________________ Installing Date_______________________________ Installing Contractor’s Phone_______________________ Air Handler Model #___________________________ Job Address____________________________________ Thermostat Line Voltage SUPPLY Disconnect Switch Temperature Integrated Control Duct Blower Motor Amps System Electric Heat Amps Duct Static RETURN Filter Drain Line DUCT SYSTEM TOTAL EXTERNAL STATIC (dry coil) dry coil wet coil SUPPLY AIR DUCT...
- Page 54 Installing Contractor’s Name_______________________ Installing Date_______________________________ Installing Contractor’s Phone_______________________ Air Handler Model #___________________________ Job Address____________________________________ Line Voltage Disconnect Switch Thermostat Integrated Control Duct System Duct System Filter RETURN SUPPLY Electric Heat Amps Blower motor Amps Drain Line Duct Static Temperature DUCT SYSTEM TOTAL EXTERNAL STATIC (dry coil) dry coil wet coil...
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