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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 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.
IMPORTANT INFORMATION FOR INSTALLER
This unit has a delay relay that delays the supply blower "ON" for 1 second and keeps the blower "ON" for 45
seconds on all fan and cooling demands.
100%
2
1
L/s
1
SECOND
COOLING
DELAY
DEMAND
Page 1
INSTALLATION
INSTRUCTIONS
Merit
Series
®
CBX25UH-T Air Handler Units
50 Hz
MULTI-POSITION AIR HANDLERS
507836-01
3/2018
Shipping and Packing List
Package 1 of 1 contains:
1 – Assembled air handler unit factory-equipped for upflow
or horizontal air discharge application (includes upflow
and horizontal drain pans and preinstalled air filter).
Check the air handler for shipping damage; if found, im-
mediately contact the last carrier. Check the unit rating
plate to confirm that delivered unit matches order.
General Information
The CBX25UH air handler is designed for indoor instal-
lation only. As shipped, the unit is ready for installation
in either upflow, horizontal left-hand or right-hand air dis-
charge applications. Air filters and other accessories are
available and listed in the CBX25UH Product Specification
bulletin (EHB) for ordering.
All units are shipped with a factory-installed check/expan-
sion valve.
This instruction is intended as a general guide and does
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation.
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
3
4
100%
L/s
OFF
45
SECS
CAUTION
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Related Manuals for Lennox CBX25UH-T
Summary of Contents for Lennox CBX25UH-T
- Page 1 INSTALLATION INSTRUCTIONS ©2018 Lennox Industries Inc. Merit Series ® Dallas, Texas, USA CBX25UH-T Air Handler Units 50 Hz MULTI-POSITION AIR HANDLERS 507836-01 3/2018 Shipping and Packing List Package 1 of 1 contains: 1 – Assembled air handler unit factory-equipped for upflow or horizontal air discharge application (includes upflow and horizontal drain pans and preinstalled air filter).
- Page 2 CBX25UH Unit Dimensions – Upflow – Inches (mm) Page 2...
- Page 3 IMPORTANT Requirements Excessive condensation may occur if the unit is installed WARNING in a warm, humid place. When the unit is installed in an unconditioned space, apply sealant around electrical Excessive Weight Hazard - Use two or more people wires, refrigerant piping and condensate lines at the when moving and installing the unit.
-
Page 4: Installation
HORIZONTAL APPLICATIONS If a return air plenum is used, the return air grille should be 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 When removing the coil, there is a possibility of danger the air handler to allow for the free flow of return air. - Page 5 ANGLE IRON OR SHEET METAL ANCE 102 MM MAXIMUM 13 MM LONG SCREW AIR FLOW FRONT FIGURE 3. Suspending Horizontal Unit RIGHT-HAND AIR DISCHARGE For horizontal right-hand air discharge, the following field modifications are required. 1 - Remove and set aside blower and coil access panels.
- Page 6 7 - Reinstall the brackets that hold the coil and horizontal drain pan in place. See figure 9. FIGURE 7. Reinstall the Top Cap. Brackets Must Cover the Hairpins 6 - Slide coil assembly, bottom drain pan and horizontal drain pan as one unit back into the air handler. FIGURE 9.
-
Page 7: 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 8 Lennox Product pulled through the condensate line will not allow positive Specifications bulletin. Additional information is provided drainage without a proper trap.
-
Page 9: Brazing Refrigerant Lines
INSTALLING DUCT SYSTEM WARNING Connect supply air duct to the flange on top of the air han- dler. If an isolation connector is used, it must be nonflam- Polyol ester (POE) oils used with HFC-410A refrigerant mable. absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. - Page 10 Technical Support Product Applications for assis- 5 - Braze using an alloy of silver or copper and tance. To obtain the correct information from Lennox, be phosphorus with a melting point above 1,100°F sure to communicate the following information: Model and (593°C).
- Page 11 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.
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Page 12: Sealing The Unit
WARNING Sealing the Unit Seal the unit so that warm air is not allowed into the cabi- Electric Shock Hazard. net. Warm air introduces moisture, which results in water Can cause injury or death. blow-off problems. This is especially important when the Foil-faced insulation conductive... - Page 13 WARNING USE COPPER CONDUCTORS ONLY 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 wire nuts to connect the field supply conductors to the unit black and yellow leads, and the ground wire to ground terminal marked GND.
- Page 14 DECK DECK NOTES: 1. FACTORY SPEED SET TO MEDIUM (BLUE) FOR -024,-030,-036,-048, AND -060 2. ALL WIRES NOT LABELED ARE PART OF ITEM 1010 FIGURE 17. Typical Wiring Diagram – CBX25UH-T Air Handler THERMOSTAT AIR HANDLER THERMOSTAT AIR HANDLER NOTE...
- Page 15 CHANGE BLOWER SPEED Air Flow – Cooling Blower Speed 1 - Disconnect all power supplies. The cooling blower speed is factory configured to provide 2 - Remove the air handler access panel. correct air flow for an outdoor unit that matches the cool- 3 - Locate pin number 2 on the blower relay.
- Page 16 Blower Data – Upflow and Horizontal CBX25UH-024 BLOWER PERFORMANCE CBX25UH-036 BLOWER PERFORMANCE Air Volume at Various Blower Speeds Air Volume at Various Blower Speeds External Static External Static Pressure Pressure High Medium High Medium in. w.g. in. w.g. 0.10 0.10 1430 1265 1095...
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Page 17: Check-Out Procedures
3 - Once demand is met, motor runs at 100% for 45 Check-out Procedures seconds. NOTE – Refer to outdoor unit installation instructions for sys- 4 - Motor ramps down to stop. tem start-up instructions and refrigerant charging instructions. PRE-START-UP CHECKS •... - Page 18 Use of Air Handler During Construction filter unless return air system is properly sized for it. Lennox does not recommend the use of its air handler unit • If water should start coming from the secondary drain during any phase of construction. Very low return air tem-...
- Page 19 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 20 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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