Lennox Merit CBX25UH Series Installation Instructions Manual
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E2012 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
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.
WARNING
The State of California has determined that this product
may contain or produce a chemical or chemicals, in very
low doses, which may cause serious illness or death. It
may also cause cancer, birth defects, or reproductive
harm.
10/2012
*2P102012*
INSTALLATION
INSTRUCTIONS
®
Merit
CBX25UH Series
Units
AIR HANDLERS
506757-01 (0659371-80)
10/2012
Table of Contents
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Shipping and Packing List
Package 1 of 1 contains the following:
1 - Assembled air handler unit for upflow or horizontal air
discharge application (includes upflow and horizontal
drain pans and pre-installed air filter).
Check equipment for shipping damage. If found,
immediately report damage to the last carrier. Check the
unit rating plate to confirm that delivered unit matches
order.
General
The CBX25UH air handler is designed for indoor
installation only. As shipped, the unit is ready for
installation in either upflow, horizontal left-hand and
right-hand air discharge applications. Electric heat, down
flow air discharge application kits, air filters and other
various accessories are available and listed in the
CBX25UH Product Specification bulletin for ordering.
All units come with a factory installed check/expansion
valve.
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506757-01
(0659371-80)
*P506757-01*
Litho U.S.A.
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Summary of Contents for Lennox Merit CBX25UH Series
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS E2012 Lennox Industries Inc. Dallas, Texas, USA ® Merit CBX25UH Series Units AIR HANDLERS Litho U.S.A. 506757-01 (0659371-80) 10/2012 Table of Contents Shipping and Packing List ..... . - Page 2 CBX25UH Unit Dimensions - inches (mm) 3/4 (19) LINE VOLTAGE Right, Left and Top LOW VOLTAGE Right Side Only AIR FLOW CONDENSATE DRAIN PIPING PLATE (4) (2−1/4 x 3−3/4) FILTER ACCESS SUCTION LINE LIQUID LINE (19) (Opening) (Opening) 2−1/2 1−3/4 2−1/2 2−1/2 (44)
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Page 3: Requirements
The air handler must be installed so that free access is instructions and local municipal building codes, installation allowed to the coil/filter compartment and blower/control of Lennox air handler units (with or without optional electric compartment. heat), MUST conform with National Fire Protection Association (NFPA) standards: “Standard for Installation... -
Page 4: Installation
If a return air plenum is used, the return air grille should be HORIZONTAL APPLICATIONS immediately in front of the opening in the plenum to allow IMPORTANT for the free flow of return air. When not installed in front of the opening, there must be adequate clearance around the air handler to allow for the free flow of return air. - Page 5 5. If the unit is suspended, the entire length of the cabinet 3. Remove coil assembly, bottom drain pan and must be supported. If you use a chain or strap, use a horizontal drain pan as one assembly from the air piece of angle iron or sheet metal attached to the unit handler.
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Page 6: Condensate Drain
TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES — GENERALLY, TWO INCHES (51MM). TRAP DEPTH TO APPROVED LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90. DRAIN FOR NEGATIVE PRESSURE COILS (BLOWER DRAIN LINE SHOULD PIPE NIPPLE PROVIDED IN BAG ASSEMBLY - SCH 80, 3/4”... -
Page 7: Duct System And Filters
5. Make sure drain ports and drain pan are free of all IMPORTANT debris. 6. Plug and check any unused drain pan openings for A field-fabricated secondary drain pan, with a drain pipe tightness. Torque plugs to 30 in. lb. to prevent water to the outside of the building, is required in all installa... -
Page 8: Connecting Refrigerant Lines
(593°C). cifications provided by the filter manufacturer against the NOTE — Do not use soft solder. data given in the appropriate Lennox Product Specifica 6. Reinstall the rubber grommets after brazing is tions bulletin. Additional information is provided in Ser... -
Page 9: Electrical Connections
1. Disconnect all power supplies. Electrical Connections 2. Remove the air handler access panel. WARNING 3. Route the field supply wires to the air handler electrical connection box. Electric shock hazard! - Disconnect all 4. Use UL-listed wire nuts to connect the field supply power supplies before servicing. -
Page 10: Airflow - Cooling Blower Speed
THERMOSTAT AIR HANDLER THERMOSTAT AIR HANDLER NOTE NOTE HEAT‐ONLY APPLICATION CONDITIONER THERMOSTAT HEAT PUMP UNIT UNIT AIR HANDLER COOLING‐ONLY APPLICATION THERMOSTAT AIR HANDLER CONNECT COMMON WIRE ONLY IF REQUIRED (REFER TO THE APPROPRIATE THERMOSTAT INSTALLATION INSTRUCTIONS) NOTE HEAT PUMP APPLICATION WITH AIR CONDITIONER ELECTRIC HEAT UNIT... - Page 11 BLOWER RELAY CHANGING BLOWER SPEED PLASTIC CAPS BLOWER RELAY HARNESS BLUE (MED) RED (L0) BLACK (HI) YELLOW (COM) 4-PIN BLOWER CONNECTOR Figure 13. Changing Blower Speed NOTE — Refer to wiring diagram located on the unit access panel (or figure 13 above) and blower performance (table 2). All air data measured external to unit with 1 inch non-pleated air filter in place.
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Page 12: Check-Out Procedures
Set the thermostat so that it does not call for heat. Check-out Procedures Allow up to 5 minutes for all sequencers to cycle off. NOTE - Refer to outdoor unit installation instructions for Operation system start-up instructions and refrigerant charging TIME DELAY RELAY instructions. -
Page 13: Maintenance
second heat sequencer can be connected with the first Matt‐ or foil-faced insulation is installed in indoor sequencer to W1 on the thermostat. They may also be equipment to provide a barrier between outside air connected to a second heating stage W2 on the conditions (surrounding ambient... - Page 14 Installing Contractor’s Name_______________________ Installing Date_______________________________ Installing Contractor’s Phone_______________________ Air Handler Model #___________________________ Job Address____________________________________ Thermostat Line Voltage SUPPLY Disconnect Switch Integrated Control Temperature 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 15 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...