Table of Contents
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Service Literature
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 and non-
communicating applications is illustrated in diagrams,
which begin on page 29.
CAUTION
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.
UNIT INFORMATION
Corp. 1917-L9
September 20, 2019
CBA25UHV (HFC- 410A) SERIES UNITS
Table of Contents
Specifications and Electrical Data ..................................3
Model Number Identification ...........................................4
Adjusting the BDC3 Blower Control ...............................4
Adjusting the Blower Speed ..........................................4
Blower Data ....................................................................6
Application ....................................................................10
Unit Components ..........................................................10
ECBA25 Electric Heat Data ..........................................12
Heat Section Installation ...............................................17
Configuration Modification ...........................................19
Brazing Connections ...................................................22
Installing the Condensate Drain ..................................24
Electrical Connections .................................................26
Inspecting and Replacing Filters .................................27
Wiring Diagrams ...........................................................28
Professional Maintenance ...........................................30
Check-out Procedures .................................................30
Sequence of Operation ................................................31
General Information
This indoor unit with all-aluminum coil is designed for
installation with optional field-installed electric heat and a
matched outdoor unit that is charged with HFC-410A re-
frigerant. These units, designed for indoor installation in
multiple positions, are completely assembled for upflow
and horizontal right-hand discharge before being shipped
from the factory.
All CBA25UHV air handlers are equipped with a facto-
ry-installed, internally mounted check / expansion valve,
which is suitable for use in HFC-410A applications.
This air handler is compatible with the ComfortSense®
non-communicating thermostat and non-communicating
outdoor units. In addition, this unit has the enhanced ca-
pability of communicating with communicating thermo-
stats and communicating outdoor units using the Lennox
RSBus protocols.
NOTE - For downflow or horizontal left-hand air discharge,
certain field modifications are required.
IMPORTANT: Special procedures are required for clean-
ing the all-aluminum coil in this unit. See page 30 in this
instruction for information.
Page 1
CBA25UHV
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Related Manuals for Lennox CBA25UHV-018
Summary of Contents for Lennox CBA25UHV-018
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Page 1: Table Of Contents
/ expansion valve, which is suitable for use in HFC-410A applications. • A Lennox communicating thermostat must be used in communicating applications. This air handler is compatible with the ComfortSense® • In non-communicating applications, the Lennox non-communicating thermostat and non-communicating ComfortSense®... -
Page 2: Cba25Uhv Unit Dimensions - Upflow - Inches (Mm)
CBA25UHV Unit Dimensions – Upflow – inches (mm) 1 (25) DETAIL OF PIPING PLATE 4-3/4 3/4 (19) (121) SUCTION LINE SUPPLY AIR LIQUID OPENING CONDENSATE LINE 14-1/2 DRAINS (2) (368) 2-3/8 (Horizontal) (60) 1 (25) 1 (25) CONDENSATE DRAINS (2) 4-3/8 (Upflow and (111) -
Page 3: Specifications And Electrical Data
Specifications and Electrical Data SPE CI F I CAT I O NS General Model Number CBA25UHV-018 CBA25UHV-024 CBA25UHV-030 CBA25UHV-036 Data Nominal tonnage Connections Suction/Vapor line (o.d.) - in. sweat Liquid line (o.d.) - in. sweat Condensate - in. fpt (2) 3/4... -
Page 4: Model Number Identification
Model Number Identification CB A 25 UH V - 030 - 230 - 10 Unit Type Minor Revision Number CB = Air Handler Refrigerant Type Voltage A = Aluminum Coil/R-410A 230 = 208/230V-1 phase-60hz Series Nominal Cooling Capacity 018 = 1.5 tons 024 = 2 tons 030 = 2.5 tons 036 = 3 tons... - Page 5 COOL COOL HEAT HEAT CBA25UHV042 PIN #3 PIN #3 PIN #3 PIN #3 Applications with the Lennox ComfortSense® 7500 ther- mostat, but no demand for de-humidification will operate COOL COOL HEAT HEAT CBA25UHV048 PIN #3 PIN #3 PIN #3...
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Page 6: Blower Data
NOTES - 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 speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications - minimum blower speed is 250 cfm. BLOWER DATA CBA25UHV-024 BLOWER PERFORMANCE 0 through 0.80 in. - Page 7 NOTES - 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 speed setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony III™ Zoning System applications - minimum blower speed is 250 cfm. BLOWER DATA CBA25UHV-042 BLOWER PERFORMANCE 0 through 0.80 in.
- Page 8 TABLE 3. CBA25UHV Thermostat and Single-Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity System Handler Step Comments Condition pressor Status (COOL) NO CALL FOR DEHUMIDIFICATION Normal Operation Acceptable 24 VAC High 100% low thermostat demand BASIC MODE (only active on a Y1 thermostat demand) Normal Acceptable...
- Page 9 TABLE 4. CBA25UHV Thermostat and Two-Stage Outdoor Unit Operating Sequence Operating Sequence System Demand System Response Thermostat Demand Relative Humidity Handler System Step Status (COOL) Comments Condition pressor NO CALL FOR DEHUMIDIFICATION Normal Operation Acceptable 24 VAC - Y1 Compressor and indoor air handler follow thermostat demand Normal Operation Acceptable...
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Page 10: Application
The unit wiring dia- grams will provide factory set blower speeds. All major blower coil components must be matched ac- cording to Lennox recommendations for the unit to be BLOWER ASSEMBLY covered under warranty. Refer to the Product Specifica- tion bulletin for approved system matchups. - Page 11 COIL PLASTIC DRAIN PANS CBA25UHV units have dual slab coils arranged in an A Drain pans are provided and installed on the CBA25UHV. configuration. Each coil has two or three rows of alumi- The drain pans are made from fiberglass filled plastic. num tubes fitted with ripple-edged aluminum fins.
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Page 12: Ecba25 Electric Heat Data
ECBA25 Electric Heat Data EL ECT RIC H EAT D ATA CB A2 5U HV-0 18 | S IN GLE P H A S E Blower Minimum Maximum Input Electic Heat Motor Circuit Overcurrent Full Load Model Number Ampacity Protection Volt Btuh Amps... - Page 13 ELE CT R IC H EAT D ATA C BA2 5 UH V-0 3 0 | S I NG LE P H A S E Minimum Maximum Single Point Input Circuit Overcurrent Blower Power Source Ampacity Protection Electic Heat Motor Model Number Full Load Minimum...
- Page 14 EL E CTR IC H EAT D ATA CBA25UHV- 036 | S ING LE P HAS E Minimum Maximum Single Point Input Circuit Overcurrent Blower Power Source Ampacity Protection Electic Heat Motor Model Number Full Load Minimum Maximum Amps Volt Btuh Ckt 1 Ckt 2...
- Page 15 EL E CTR IC H EAT D ATA CBA25UHV- 042 | S ING LE P HAS E Minimum Maximum Single Point Input Circuit Overcurrent Blower Power Source Ampacity Protection Electic Heat Motor Model Number Full Load Minimum Maximum Amps Volt Btuh Ckt 1 Ckt 2...
- Page 16 EL E CTR IC H EAT D ATA CBA25UHV- 0 48 | CBA25UHV- 060 | S ING L E P H AS E Minimum Maximum Single Point Input Circuit Overcurrent Blower Power Source Ampacity Protection Electic Heat Motor Full Load Model Number Minimum Maximum...
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Page 17: Heat Section Installation
6 - Secure the electric heater assembly into place Heat Section Installation with the screws that were removed from the heat element panel. Install two field-provided #8 SDST WARNING screws in the front of the electric heater assembly (see figure 6). Before installing or servicing unit, be sure ALL power to the unit is OFF. -
Page 18: Electrical Connections
IMPORTANT NOTE - There may be only one clip securing each circuit breaker. USE COPPER CONDUCTORS ONLY BREAKER(S) MOUNTING CIRCUIT BRACKET BREAKER NOTE – Refer to the nameplate on the air handler unit for minimum circuit ampacity and maximum overcurrent protection size. -
Page 19: Configuration Modification
1 - Set the thermostat above room temperature. CIRCUIT BREAKER COVER (BACKSIDE) 2 - Check the heat pump and the heat section for normal operation. 3 - Set the thermostat to desired setting. 4 - Affix the wiring diagram sticker to air handler scroll, aligned with circuit breaker unit wiring diagram sticker. - Page 20 HORIZONTAL APPLICATION TOP CAP ROTATED TO IMPORTANT CORRECT POSITION TOP CAP SCREWS CABINET SUPPORT When removing the coil, there is possible danger of equipment damage and personal injury. Be careful when removing the coil assembly from a unit installed in right- or left-hand applications.
- Page 21 NOTE – For horizontal applications in high humidity ar- DOWNFLOW APPLICATION eas, remove the downflow rail closest to the drain pan. To NOTE – If downflow application is required, separately or- remove rail, remove screw from rail at back of unit and at der kit number Y9658 (-018 through -030) or Y9659 (-036 cabinet support rail.
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Page 22: Brazing Connections
NOTE - When installing refrigerant lines longer than 50 piping during brazing. This will help to prevent oxidation feet, see the Lennox Refrigerant Piping Design and Fab- and the introduction of moisture into the system. rication Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance. - Page 23 PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING OPERATIONS BEFORE PROCEEDING. 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 24: Installing The 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 MAIN DRAIN. - Page 25 1 - Remove the appropriate drain knockouts. If 2 - Check to make sure the drain pan is draining necessary, remove the indoor coil assembly from completely, no leaks are found in drain line fittings, the cabinet. and water is draining from the end of the primary drain line.
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Page 26: Electrical Connections
Make sure the liquid line and suction line entry points are IMPORTANT sealed with either the provided flexible elastomeric ther- mal insulation, or field provided material (e.g. Armaflex, Refrigerant lines must be clean, dehydrated, refrigerant- Permagum or equivalent). Any of the previously men- grade copper lines. -
Page 27: Inspecting And Replacing Filters
1 - Disconnect all power supplies. WARNING 2 - Remove the air handler access panel. Electrically ground air handler. Connect 3 - Route the field supply wires to the air handler ground wire to ground terminal marked electrical connection box. “GND”. -
Page 28: Wiring Diagrams
Wiring Diagrams FIGURE 24. Typical Wiring Diagram – CBA25UHV Air Handler with Electric Heat – (Variable-Speed Motor) Page 28... - Page 29 WARNING USE COPPER CONDUCTORS ONLY FIGURE 25. Low Voltage Connections (Variable-Speed Motor) Page 29...
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Page 30: Professional Maintenance
Use of Air Handler During Construction system start-up instructions and refrigerant charging in- structions. Lennox does not recommend the use of its air handler unit during any phase of construction. Very low return air tem- PRE-START-UP CHECKS peratures, harmful vapors and operation of the unit with •... -
Page 31: Sequence Of Operation
HEATING (HEAT PUMP) Sequence of Operation When the thermostat calls for heating, 24 volts is put on the blower time-delay relay coil. Then normally open con- COOLING (COOLING ONLY OR HEAT PUMP) tacts close, causing the indoor blower motor to operate. When the thermostat calls for cooling, 24 volts is put on The circuit between R and Y is completed, closing the cir- the blower time-delay relay coil and then the indoor blow-... - Page 32 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 33 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...