User's Manual

ManualsBrandsLennox International Inc. ManualsAir ConditionersLennox International Inc. Lennox International Inc. Air Conditioner Merit CBX25UH Series

10/2012 506757-01 (0659371-80)

*2P102012* *P506757-01*

Page 1

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.

INSTALLATION

INSTRUCTIONS

Merit

CBX25UH Series

Units

AIR HANDLERS

506757-01 (0659371-80)

10/2012

Table of Contents

Shipping and Packing List 1......................

CBX25UH Series Units 1.........................

Requirements 3.................................

Installation Clearances 3.........................

Installation 4....................................

Condensate Drain 6.............................

Duct System and Filters 7........................

Connecting Refrigerant Lines 8...................

Sealing the Unit 8...............................

Electrical Connections 9.........................

Airflow - Cooling Blower Speed 10..................

Check-Out Procedures 12.........................

Operation 12....................................

Maintenance 13..................................

Cabinet Insulation 13.............................

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.

Litho U.S.A.

Summary of content (16 pages)

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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 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.
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CBX25UH Unit Dimensions - inches (mm) B C 3/4 (19) LINE VOLTAGE Right, Left and Top LOW VOLTAGE Right Side Only AIR FLOW A CONDENSATE DRAIN PIPING PLATE (4) (2−1/4 x 3−3/4) FILTER ACCESS SUCTION LINE F LIQUID LINE J E 3/4 (19) D H G 2−1/2 (64) Dimension (Opening) FRONT VIEW 2−1/2 (64) −024 −018 inches 1−3/4 (44) mm inches −030 mm inches (Opening) SIDE VIEW −036 mm −042 inches mm inches 2−1/2 (64) −048 / −060 mm inches mm 1334 A 38 965 40−1/2 1029 43 1092 48 1219 4
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Do not remove the cabinet knockouts until it has been determined which knockouts will need to be removed for the installation. Select the final air discharge position which best suits the site conditions. Consider required clearances, space, routing requirements for refrigerant line, condensate disposal, filters, duct system, wiring, and accessibility for service. Refer to the air handler rating plate on the air handler for specific information.
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If a return air plenum is used, the return air grille should be immediately in front of the opening in the plenum to allow 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. HORIZONTAL APPLICATIONS IMPORTANT When removing the coil, there is possible danger of equipment damage and personal injury.
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3. Remove coil assembly, bottom drain pan and horizontal drain pan as one assembly from the air handler. 5. If the unit is suspended, the entire length of the cabinet must be supported. If you use a chain or strap, use a piece of angle iron or sheet metal attached to the unit (either above or below) to support the length of the cabinet. Use securing screws no longer than 1/2 inch to avoid damaging the coil or filter. See figure 2.
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HORIZONTAL RIGHT REMOVE 2 SCREWS SECURING BLOW OFF PREVENTION BRACKET HORIZONTAL LEFT (FACTORY DEFAULT) ROTATE BRACKET TO THIS POSITION AND REINSTALL Figure 8. Blow-Off Prevention Plate Condensate Drain IMPORTANT On units of this type, where the blower “draws” rather than “blows” air through the coil, traps must be installed in the con densate drain lines (primary and auxiliary, if used). Traps prevent the blower from drawing air through the drain lines into the air supply.
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5. Make sure drain ports and drain pan are free of all debris. IMPORTANT 6. Plug and check any unused drain pan openings for tightness. Torque plugs to 30 in. lb. to prevent water leaks or seepage from the drain pan. A field-fabricated secondary drain pan, with a drain pipe to the outside of the building, is required in all installa tions over a finished living space or in any area that may be damaged by overflow from the main drain pan.
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IMPORTANT If a highefficiency filter is being installed as part of this system to ensure better indoor air quality, the filter must be properly sized. Highefficiency filters have a higher static pressure drop than standardefficiency glass/foam filters. If the pressure drop is too great, system capacity and performance may be reduced.
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1. Disconnect all power supplies. 2. Remove the air handler access panel. 3. Route the field supply wires to the air handler electrical connection box. 4. Use UL-listed wire nuts to connect the field supply conductors to the unit black and yellow leads, and the ground wire to ground terminal marked GND. 5. Replace the air handler access panel. Electrical Connections WARNING Electric shock hazard! - Disconnect all power supplies before servicing. Replace all parts and panels before op erating.
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THERMOSTAT AIR HANDLER R THERMOSTAT G G BU SEE NOTE AIR HANDLER R SEE NOTE BU W Y HEAT‐ONLY APPLICATION AIR CONDITIONER UNIT THERMOSTAT AIR HANDLER R COOLING‐ONLY APPLICATION THERMOSTAT AIR HANDLER G R W BK SEE NOTE Y BU CONNECT COMMON WIRE ONLY IF REQUIRED G HEAT PUMP UNIT (REFER TO THE APPROPRIATE THERMOSTAT INSTALLATION INSTRUCTIONS) BK W BU HEAT PUMP APPLICATION WITH ELECTRIC HEAT AIR CONDITIONER UNIT COOLING APPLICATION WITH ELECTRIC HEAT NOTE - Connect common wire only i
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BLOWER RELAY CHANGING BLOWER SPEED 5 PLASTIC CAPS BLOWER RELAY HARNESS BLUE (MED) RED (L0) 2 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). S S S All air data measured external to unit with 1 inch non-pleated air filter in place. All factory settings are medium speed except the -48 which is set to low speed from the factory.
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S Check-out Procedures NOTE - Refer to outdoor unit installation instructions for system start-up instructions and refrigerant charging instructions.
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second heat sequencer can be connected with the first sequencer to W1 on the thermostat. They may also be connected to a second heating stage W2 on the thermostat subbase. EMERGENCY HEAT (HEATING HEAT PUMP) If the selector switch on the thermostat is set to the emergency heat position, the heat pump will be locked out of the heating circuit, and all heating will be electric heat (if applicable).
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Installing Contractor’s Name_______________________ Installing Contractor’s Phone_______________________ Job Address____________________________________ Installing Date_______________________________ Air Handler Model #___________________________ Thermostat 9 SUPPLY AIR Disconnect Switch Line Voltage 3 8 2 Integrated Control Temperature 1 Duct System 6 Blower Motor Amps 7 Electric Heat Amps 5 Duct Static RETURN AIR 1 Filter DUCT SYSTEM 5 4 Drain Line TOTAL EXTERNAL STATIC (dry coil) dry
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Installing Contractor’s Name_______________________ Installing Contractor’s Phone_______________________ Job Address____________________________________ Thermostat 2 Integrated 1 Duct System Installing Date_______________________________ Air Handler Model #___________________________ Disconnect Switch 9 Control Line Voltage 3 1 Duct System Filter RETURN AIR SUPPLY AIR 6 Electric Heat Amps 4 Drain Line 7 Blower motor Amps 5 8 Duct Static 1 Temperature DUCT SYSTEM 5 TOTAL EXTERNAL STATIC (
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