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©2018 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.
INSTALLATION
INSTRUCTIONS
®
Merit
CBX25UHV (-10) Series
Units
AIR HANDLERS
507616-02
7/2018
Shipping and Packing List
Package 1 of 1 contains the following:
1 -
Assembled air handler unit factory-equipped for up-flow or
horizontal air discharge application (includes up-flow 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 Merit
CBX25UHV air handler is designed for indoor
installation only. As shipped, the unit is ready for installation in
either up-flow or horizontal left-hand air discharge applications.
Horizontal drain pan may be repositioned in the field to allow
installation in the horizontal right-hand air discharge position.
Various accessories are listed in the CBX25UHV Product
Specification bulletin.
All units are equipped with a factory-installed check/expansion
valve.
Page 1
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Summary of Contents for Lennox Merit CBX25UHV
- Page 1 INSTALLATION INSTRUCTIONS ©2018 Lennox Industries Inc. Dallas, Texas, USA ® Merit CBX25UHV (-10) Series Units AIR HANDLERS 507616-02 7/2018 Shipping and Packing List Package 1 of 1 contains the following: Assembled air handler unit factory-equipped for up-flow or THIS MANUAL MUST BE LEFT WITH THE...
- Page 2 ® Merit CBX25UHV Unit Dimensions – Up-flow – inches (mm) NOTE - Unit is shipped configured for horizontal left-hand air discharge. Unit may be converted to horizontal right- hand air discharge by repositioning horizontal drain pan. Dimensions remain the same in all configurations. Page 2...
- Page 3 In addition to conforming to manufacturer's installation instructions and local municipal building codes, installation of Lennox air handler units (with or without optional electric This unit is approved for installation clearance to com heat), MUST conform with National Fire Protection bustible material as stated on the unit rating plate.
- Page 4 If the free area is not known, assume a 25% free area for HORIZONTAL APPLICATIONS wood or a 75% free area for metal louvers or grilles. Using IMPORTANT the louver dimensions and the 25% or 75% assumption, determine if the open area meets the minimum open area listed above.
- 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 unit from the air handler. piece of angle iron or sheet metal attached to the unit (either above or below) to support the length of the cabinet.
- Page 6 Figure 7. Reinstall the Top Cap. Brackets Must Cover the Hairpins Figure 9. Reinstall Brackets that Hold the Coil and 6 - Slide coil assembly, bottom drain pan and horizontal Horizontal Drain Pan in Place drain pan as one unit back into the air handler. Repositioning Black Box on Motor Module –...
- Page 7 9 - The black box is fastened to the motor module at each 11 - Slide the blower assembly into the cabinet to confirm end with a strip of black double-sided tape. Starting at clearance between the horizontal drain pan and the one end, slide the putty knife between the black box black box.
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Page 8: Condensate Drain
Condensate Drain INSTALL CONDENSATE DRAIN IMPORTANT The air handler is equipped with ¾” NPT condensate drain connections. A field-fabricated secondary drain pan, with a drain pipe to the outside of the building, is required in all installa IMPORTANT tions over a finished living space or in any area that may be damaged by overflow from the main drain pan. - Page 9 TRAP 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 AFTER COIL), A TRAP IS REQUIRED ON THE...
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Page 10: Duct System And Filters
Handle the refrigerant lines gently during the installation data given in the appropriate Lennox Product Specifica process. Sharp bends or kinks in the lines will cause a tions bulletin. Additional information is provided in Ser... - Page 11 NOTE - When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351-L9, or contact WARNING Lennox Technical Support Product Applications for assistance.
- Page 12 PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING OPERATIONS ON PREVIOUS PAGES BEFORE PROCEEDING. 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.
- Page 13 Sealing the Unit WARNING Seal the unit so that warm air is not allowed into the cabinet. Warm Electric Shock Hazard. air introduces moisture, which results in water blow-off problems. Can cause injury or death. This is especially important when the unit is installed in an Foil‐faced insulation has conductive characteristics sim...
- Page 14 ● Electrical wiring, disconnect means and over-current protection are to be supplied by the installer. Refer to the air handler rating plate for maximum over-current protection, minimum circuit ampacity, as well as operating voltage. Select the proper supply circuit conductors in accordance with tables 310-16 and 310-17 in the National Electric Code, ANSI/NFPA No.
- Page 15 SYSTEM FIELD JUMPERS WARNING SINGLE STAGE AIR CONDITIONER NEED ALL TWO−STAGE AIR CONDITIONER REMOVE Y1 TO Y2 SINGLE STAGE HEAT PUMP REMOVE R TO O USE COPPER CONDUCTORS ONLY TWO−STAGE HEAT PUMP REMOVE Y1 TO Y2 AND R TO O TWO−STAGE ELECTRIC HEAT REMOVE W1 TO W2 TO ACTIVATE DEHUMIDIFICATION...
- Page 16 WARNING USE COPPER CONDUCTORS ONLY Figure 22. Low Voltage Connections (Variable-Speed Motor) Page 16...
- Page 17 JUMPER SETTINGS BDC3 Blower Control IMPORTANT JP1 15 PIN Before changing jumper setting, make sure the PLUG (BOARD motor has completely stopped. Any jumper setting TO MOTOR) change will not take place while the motor is running. Table 2 lists the recommended factory blower speed tap 24V ACCESSORY ®...
- Page 18 The effect of static pressure, filter and electric heater resistance is included in the air volumes listed. First-stage cooling air volume is 70% of COOL (second-stage) speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications minimum blower speed is 250 cfm. ®...
- Page 19 The effect of static pressure, filter and electric heater resistance is included in the air volumes listed. First-stage cooling air volume is 70% of COOL (second-stage) speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications minimum blower speed is 250 cfm. ®...
- Page 20 The effect of static pressure, filter and electric heater resistance is included in the air volumes listed. First-stage cooling air volume is 70% of COOL (second-stage) speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications minimum blower speed is 450 cfm. ®...
- Page 21 ® Table 11. Merit CBX25UHV, Thermostat and Two‐Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity Handler System Com Step Status (COOL) Comments Condition pressor NO CALL FOR DEHUMIDIFICATION Normal Operation Acceptable 24 VAC - Y1 Compressor and indoor air handler follow thermostat demand...
- Page 22 #4 Pins Jumpered CHECK COOLING OPERATION ● thermostat force call cooling A- Motor runs at 50% for 30 seconds. (approximately 5ºF lower than the indoor ambient B- Motor then runs at 82% for approximately 7-1/2 temperature). minutes. If demand has not been satisfied after 7-1/2 ●...
- Page 23 Use of Air Handler During Construction ambient air will affect the inside surface temperature of the Lennox does not recommend the use of its air handler unit cabinet. The temperature/humidity difference between the during any phase of construction. Very low return air...
- Page 24 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 25 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...