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E2008 Lennox Industries Inc.
Dallas, Texas, USA
WARNING
Improper
installation,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and
service must be performed by a qualified installer or
service agency.
CAUTION
Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Be aware of, and use
caution when working near these areas during
installation or while servicing this equipment.
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
noncompliance.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Engineering Handbook. Coils
previously charged with HCFC−22 must be
flushed.
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
IMPORTANT INFORMATION TO INSTALLER
MOTOR SHIPPING BOLT
A
TOP CAP SHIPPING BRACKET (REPLACE
SCREWS IN TOP CAP AFTER REMOVAL)
C
REFRIGERANT LINE CAPS [SEE
BRAZING CONNECTION ON PAGE 8]
04/08
*2P0408*
adjustment,
alteration,
may
be
levied
for
CHECK FOR AND REMOVE THE FOLLOWING ITEMS BEFORE OPERATING UNIT.
MOTOR SHIPPING BRACKET
D
CONFIGURATION JUMPERS (IF NECESSARY) (SEE
ADJUSTING THE BDC3 BLOWER CONTROL BOARD
F
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature
Collection CB31MV Units
MULTI−POSITION AIR HANDLER
505,341M
04/08
Supersedes 07/07
Table of Contents
CB31MV Up−flow/Down−flow Unit Dimensions
CB31MV Horizontal LH/RH Unit Dimensions
General Information
Shipping and Packing List
Requirements
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Installing the Unit
Brazing Connections
Installing the Condensate Drain
Inspecting and Replacing Filters
Sealing the Unit
Adjusting the BDC3 Blower Control Board
Adjusting the Blower Speed
Making Electrical Connections
Repairing or Replacing Cabinet Insulation
HOUSING SUPPORT PAD
B
HORIZONTAL DRAIN PAN (SEE UP−FLOW
APPLICATIONS ON PAGE 4 AND
DOWN−FLOW APPLICATIONS ON PAGE 6 )
E
G
ON PAGE 11.
Page 1
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505,341M
*P505341M*
®
Litho U.S.A.
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Summary of Contents for Lennox Signature CB31MV
- Page 1 This unit must be matched with an indoor coil as Adjusting the Blower Speed ....specified in Lennox Engineering Handbook. Coils previously charged with HCFC−22 must be Making Electrical Connections .
- Page 2 CB31MV Up−flow and Down−flow Unit Dimensions − Inches (mm) DIMENSION CB31MV−041 inches (mm) 51 (1295) 21-1/4 (540) 22-5/8 (502) 19-3/4 (575) 21 (533) 20 (508) 26-3/8 (670) 24-5/8 (625) CB31MV−051, −065 inches (mm) 58-1/2 (1486) 21-1/4 (540) 24-5/8 (625) 19-3/4 (502) 23 (584) 20 (508) 27-7/8 (708) 30-5/8 (778)
- Page 3 CB31MV Horizontal Left− and Right−Hand Unit Dimensions − Inches (mm) DIMENSION CB31MV−041 inches (mm) 51 (1295) 21-1/4 (540) 22-5/8 (502) 19-3/4 (575) 21 (533) 20 (508) 26-3/8 (670) 24-5/8 (625) CB31MV−051, −065 inches (mm) 58-1/2 (1486) 21-1/4 (540) 24-5/8 (625) 19-3/4 (502) 23 (584) 20 (508) 27-7/8 (708) 30-5/8 (778)
- Page 4 Remove corrugated padding from the space instructions and local municipal building codes, installation between the blower and coil assemblies. of Lennox air handler units (with or without optional electric Step 3. Discard drip shields which are shipped inside heat), MUST conform with the following National Fire corner post packaging.
- Page 5 If the application will not include a return air plenum, install the unit on a raised stand at least 14" from the floor to ensure proper air return. Lennox offers an optional up−flow unit stand as listed in table 1. HORIZONTAL DRAIN DOWN−FLOW RAIL...
- Page 6 NOTE − For horizontal applications, a secondary drain pan Step 9. Rotate top cap 180° front to back and align with unused screw holes. Holes must align with front is recommended. Refer to local codes. and back coil end plates. Note that top cap has Use the following procedures to configure the unit for a 45°...
- Page 7 CAUTION BLOWER FOR DOWN−FLOW COIL UNIT APPLICATIONS If electric heat section with circuit breakers (ECB29/ECB31) is applied to down−flow CB31MV unit, the circuit breakers must be rotated 180° to the UP position. See ECB29/ECB31 installation instruc- tions for more details. COMBUSTIBLE FLOOR ADDITIVE BASE PROPERLY SIZED...
-
Page 8: Brazing Connections
Use R410−A procedures. Lennox L15 (sweat) series line sets as listed in table 2 on page 9, or use field−fabricated refrigerant lines. L10 (flare) Step 9. Install access panel. Page 8... -
Page 9: Inspecting And Replacing Filters
Table 2. Refrigerant Line Kits Slope horizontal runs 1 inch per 10 feet of drain line to offset friction. Vapor/ CB31MV Liquid Suction Leave an open vent in the drain line, as shown in figure Units Line Line Sets Line Sets Line 13 to overcome line length, friction and static pressure. -
Page 10: Adjusting Blower Speed
the BDC3 control board. The jumpers are labeled 1, 2, 3, add or subtract a percentage of the CFM selected. The and 4. Each of the numbers corresponds with an air Test jumper is used to operate the motor in the test mode. volume (CFM) setting. -
Page 11: Making Electrical Connections
COOL JUMPERS Once demand is met, motor runs at 100% for 45 seconds. Then, The COOL jumper is used to determine the CFM during ramps down to stop. either 1) cooling or 2) heat pump operation without a call for electric heat. - Page 12 With Heat Pump − Y1 to Y2 Lennox SignatureStatt used for these applications are 51M26 − 1 heat / 1 cool or 51M28 − 2 heat / 2 cool heat pump During dehumidification, cooling air handler speed is as follows: 65% of COOL cfm for −41units, 60% COOL cfm for −51 and −61 units ** In Precision mode, SignatureStatt thermostat built BEFORE October 2003 will maintain room temperature up to 3°F (1.8°C) cooler than room...
- Page 13 Lennox SignatureStatt used for these applications are 51M27 − 2 heat / 2 cool or 51M28 − 2 heat / 2 cool heat pump. During dehumidification, cooling air handler speed is as follows: 65% of COOL cfm for −41units, 60% COOL cfm for −51 and −61 units ** In Precision mode, SignatureStatt thermostat built BEFORE October 2003 will maintain the room temperature up to 3°F (1.8°C) cooler than room...
- Page 14 Figure 16. CB31MV Blower Coil Unit Typical Wiring Diagram Page 14 505341M 04/08...
- Page 15 LINE VOLTAGE − FIELD-INSTALLED CLASS 2 VOLTAGE − FIELD-INSTALLED NEC/CEC NOTE − ALL REMAINING WIRES FACTORY-INSTALLED TO EXTERNAL LOAD 24VAC AT .5 AMP MAXIMUM NEC/CEC CLASS 2, 3 VA FACTORY INSTALLED JUMPERS. − R" to O" USED ONLY IN CONDENSING UNIT APPLICATIONS. REMOVE IN HEAT PUMP APPLICATIONS.
- Page 16 LINE VOLTAGE − FIELD-INSTALLED CLASS 2 VOLTAGE − FIELD-INSTALLED NEC/CEC NOTE − ALL REMAINING WIRES FACTORY-INSTALLED TO EXTERNAL LOAD 24VAC AT .5 AMP MAXIMUM NEC/CEC CLASS 2, 3 VA FACTORY INSTALLED JUMPERS. − R" to O" USED ONLY IN CONDENSING UNIT APPLICATIONS. REMOVE IN HEAT PUMP APPLICATIONS.
- Page 17 K20 INDOOR BLOWER RELAY FIELD−SUPPLIED WIRE NUTS (Black) (Orange) CIRCUIT 1 FUSE FACTORY INSTALLED JUMPER FACTORY INSTALLED JUMPERS. − R" to O" used only in con- densing unit applications. Remove in heat pump applications. Remove DS" to Y1" jumper when humidity control (SignatureStatt) is used.
- Page 18 Remove R" to O" factory−installed jumper in heat pump applications. FACTORY INSTALLED JUMPERS − R" to O" used only in condensing unit applications. Remove in heat pump applications. Remove DS" to Y1" jumper when CCB1 humidity control (A20) is used. Remove Y1"...
- Page 19 Remove R" to O" factory− installed jumper in heat pump applications. FACTORY INSTALLED JUMPER FACTORY INSTALLED JUMPERS. − R" TO O" USED ONLY IN CONDENSING UNIT APPLICATIONS. REMOVE IN HEAT PUMP APPLICATIONS. REMOVE DS" TO Y1" JUMPER WHEN CCB1 HUMIDITY CONTROL (A20) IS USED.
-
Page 20: Repairing Or Replacing Cabinet Insulation
Repairing or Replacing Cabinet Insulation IMPORTANT DAMAGED INSULATION MUST BE REPAIRED OR REPLACED before the unit is put back into GLUE − Make sure there is full coverage of glue on the operation. Insulation loses its insulating value metal or insulation so there when wet, damaged, separated or torn.
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