Lennox International Inc Water Heater AIR HANDLERS User Manual

INSTALLATION  
INSTRUCTIONS  
E2006 Lennox Industries Inc.  
Dallas, Texas, USA  
CBWMV Series Units  
AIR HANDLERS  
505,047M  
09/06  
Supersedes 02/06  
Litho U.S.A.  
Table of Contents  
Shipping & Packing List . . . . . . . . . . . . . . . . . . . . . . . .  
CBWMV Unit Dimensions . . . . . . . . . . . . . . . . . . . . . .  
CBWMV Unit Parts Arrangement . . . . . . . . . . . . . . . .  
CBWMV Unit Parts Description . . . . . . . . . . . . . . . . . .  
CBWMV Unit Optional Accessories . . . . . . . . . . . . . .  
Installation − Setting Equipment . . . . . . . . . . . . . . . . . .  
Return Air Opening Guidelines . . . . . . . . . . . . . . . . . .  
Filter Assembly & Filters . . . . . . . . . . . . . . . . . . . . . . .  
BDC3 Variable Blower Control Board . . . . . . . . . . . . . 12  
Troubleshooting:  
RETAIN THESE INSTRUCTIONS  
FOR FUTURE REFERENCE  
WARNING  
Due to higher operating pressures, CBWMV units  
must not be applied to steam boiler systems.  
CAUTION  
Unit is designed to be used with non−potable boiler  
systems only.  
Continuous Fan Sequence of Operation . . . . . . . . . . 18  
Cooling Sequence of Operation . . . . . . . . . . . . . . . . . 19  
Heating Sequence of Operation . . . . . . . . . . . . . . . . . 20  
Shipping & Packing List  
CAUTION  
1 − CBWMV Air Handler [NOTE − Includes freezestat  
mounted to the manifold.]  
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.  
1 − Bag assembly containing:  
1 − Electrical make−up box  
1 − Copper fitting  
1 − Snap bushing  
Introduction  
2 − Water line grommets  
3 − Wire nuts  
The multi−positional Dave Lennox Signaturet Collection  
CBWMV air handler/hot water coil unit is designed to be  
used with non-potable boiler systems for warm air heating.  
A variety of Lennox air conditioning systems may be ap-  
plied to the CBWMV unit for optional cooling.  
2−7/8" cabinet plugs  
Check equipment for shipping damage. If you find any  
damage, immediately contact the last carrier.  
09/06  
505,047M  
Page 1  
*2P0906*  
*P505047M*  
 
 
General  
CBWMV Unit Parts Description  
Blower  
These instructions are intended as a general guide and do  
not supersede local codes in any way. Consult authorities  
having jurisdiction before installation. Only qualified ser-  
vice technicians or installers may install and service this  
unit.  
The CBWMV is equipped with a variable speed motor that  
provides separate cooling and heating CFM selections  
and low continuous fan speeds.  
Hot Water Coil  
The copper tube coil is equipped with aluminum fins which  
provide excellent heat transfer. Manual air bleed ports are  
located in the copper tubing to release trapped air in the  
water circuit in all unit configurations.  
CBWMV Unit Parts Arrangement  
CBWMV Unit  
HOT WATER  
COPPER  
TUBE COIL  
INSULATED  
STEEL  
CABINET  
Blower Control  
The control provides a fixed blower delay of 45 seconds  
ON / 30 seconds OFF on a W call.  
Thermostat and accessory connections are made to the  
terminal strips in the control box.  
CBWMV Unit Optional Accessories  
Accessory Circulators (53J76, 99K69)  
An accessory circulator should be used in long line ap-  
plications. Two circulators are available with either 9 gal-  
lons per minute (99K69) or 14 gpm (53J76) flow rate. Both  
units have 7/8" soldering joints (inlet and outlet) . See pip-  
ing section for more information.  
Downflow Base (68M03)  
A downflow base kit is available for downflow applications  
without add−on cooling coils. The base provides clearance  
for routing the CBWMV unit’s inlet and outlet water lines.  
NOTE − Downflow applications with an add−on cooling coil  
require field−fabricated transitions to provide adequate  
clearance for servicing/removing the cooling coil without  
cutting the water lines.  
SUPPLY AIR  
BLOWER  
CBWMV  
CONTROL BOX  
Figure 1  
Page 3  
CBWMV SERIES  
 
 
Requirements  
Application  
The CBWMV unit is designed for use in non−potable water  
boiler systems. The water heating device must be ade-  
quate to provide enough heat according to the Engineering  
Handbook specifications. The water heating device must  
provide a minimum of 6 gallons/minute for small units  
(CBWMV−040, −070) and 9 gallons/minute for large units  
(CBWMV−090, −100, −120).  
WARNING  
Improper installation, adjustment, alteration, ser-  
vice or maintenance can cause personal injury, loss  
of life, or damage to property.  
Installation and service must be performed by a  
qualified installer or service agency.  
Installation − Setting Equipment  
Installation of Lennox CBWMV unit must conform with lo-  
cal building codes. Refer to the electrical section (Page 8)  
for US and Canadian electrical regulations.  
WARNING  
This product contains fiberglass wool.  
When paired with a water heating device, refer to local  
building codes for special considerations. Refer to water  
heating device for agency and service clearances. Clear-  
ances to combustibles for the CBWMV unit only is zero  
inches on all sides. Table 1 lists recommended service  
clearances.  
Disturbing the insulation during installation, main-  
tenance, or repair will expose you to fiberglass wool  
dust. Breathing this may cause lung cancer. (Fiber-  
glass wool is known to the State of California to  
cause cancer.)  
Table 1  
Fiberglass wool may also cause respiratory, skin,  
and eye irritation.  
CBWMV Unit Service Clearances  
To reduce exposure to this substance or for further  
information, consult material safety data sheets  
available from address shown below, or contact  
your supervisor.  
Clearances  
Location  
Inches (mm)  
Recommended  
Service Access  
Front Access  
Panel  
30 (762)  
Lennox Industries Inc.  
P.O. Box 799900  
Dallas, TX 75379−9900  
NOTE − Service access clearance must be maintained.  
Accessibility and service clearances must take prece-  
dence over fire protection clearances.  
For installation in a residential garage, unit must be lo-  
cated or protected to avoid physical damage by vehicles.  
The boiler installation must conform to the requirements of  
the authority having jurisdiction or, in the absence of such  
requirements, to the latest revision of the National Fuel  
Gas Code, ANSI Z223. (Available from the American Gas  
Association, 8501 E. Pleasant Valley Road, Cleveland,  
OH 44134). Reference should also be made to local gas  
utility regulations and other codes in effect in the same  
area in which the installation is to be made. When installed  
in Canada: The latest revision of the CAN1/CSA−B149.1  
and/or B149.2 Installation Codes for Gas-Burning Equip-  
ment and/or local codes.  
The CBWMV unit must be installed so that its electrical  
components are protected from water.  
When the CBWMV unit is used with an air conditioner, the  
air handler shall be installed on the upstream side of the  
cooling evaporator coil to avoid freeze−up of water system  
and condensation. With a parallel flow arrangement, a  
damper (or other means to control the flow of air) must ad-  
equately prevent chilled air from entering the air handler. If  
the damper is manually operated, it must be equipped to  
prevent operation of either the heating or the cooling unit,  
unless it is in the full HEAT or COOL setting.  
Determine the CBWMV unit installation location and posi-  
tion units so that door panels are accessible. Keep in mind  
routing of the water and plumbing lines and electrical con-  
nections.  
NOTE −CBWMV series units must not be used in or for the  
following applications:  
The CBWMV unit is multi−positional. No adjustment is nec-  
essary to apply unit for upflow or horizontal discharge. A  
downflow base is available and provides clearance for  
routing the inlet/outlet water lines when the CBWMV unit is  
applied without an add−on cooling coil. Downflow applica-  
S
S
S
S
construction heater − during any phase of construction  
unit heater  
mobile home heater  
potable water applications  
Page 4  
505047 09/06  
 
 
tions with add−on cooling coils require field−fabricated tran-  
sitions that provide at least 6 inches of clearance for the  
amples.  
Either suspend the unit from the roof rafters or floor joists  
or mount on a platform. The CBWMV unit must be level  
and well supported.  
NOTE − 1/2 hp and 1 hp blower motors are equipped with  
three flexible legs and one rigid leg. The rigid leg is  
equipped with a shipping bolt and a flat white plastic wash-  
er (rather than the rubber mounting grommet used with a  
flexible mounting leg). The bolt and washer must be re-  
moved before the air handler is placed into operation.  
After the bolt and washer have been removed, the rigid leg  
will not touch the blower housing.  
CBWMV Multi−Positional Unit  
AIR  
FLOW  
RIGHT HAND DISCHARGE*  
AIR  
FLOW  
AIR  
Duct System  
FLOW  
Use industry-approved standards (such as those pub-  
lished by Air Conditioning Contractors of America or Amer-  
ican Society of Heating, Refrigerating and Air Conditioning  
Engineers) to size and install the supply and return air duct  
system. This will result in a quiet and low-static system that  
has uniform air distribution.  
UPFLOW  
DOWNFLOW BASE  
AIR  
FLOW  
LEFT HAND DISCHARGE*  
DOWNFLOW  
NOTE − Do not operate the air handler with an external  
static pressure that exceeds 0.8 inches w.c. Higher exter-  
nal static pressures may cause erratic operation.  
* CBWMV units must not be installed horizontally on the front or  
back of the unit.  
Return Air Plenum  
Figure 2  
Units may be horizontally installed in either attic or crawl  
space.  
IMPORTANT  
Return air must not be drawn from a room where any  
fossil fuel appliance (ie., a water heater) is installed.  
CAUTION  
CBWMV series units are shipped with an antifreeze  
thermostat to prevent the water coil from freezing.  
The freezestat is installed at the factory but must be  
field wired (see figures 12 and 13). Do not bypass  
this feature when you install or run the unit.  
When return air is drawn from a room, a negative pres-  
sure is created in the room. If a fossil fuel appliance is op-  
erating in a room with negative pressure, the flue prod-  
ucts can be pulled back down the vent pipe and into the  
room. This reverse flow of the flue gas may result in in-  
complete combustion and the formation of carbon mon-  
oxide gas. This toxic gas might then be distributed  
throughout the house by the air handler duct system.  
CAUTION  
Use a drain pan for installations over finished living  
areas.  
Page 5  
CBWMV SERIES  
 
 
Side Return Air With Transition And Filter  
Return Air Opening Guidelines  
NOTE − Do not bring in air from the back of the unit. Return  
air can be brought in from the sides or bottom only.  
20" X 25" X 1"  
(508MM X 635MM X 25MM)  
CLEANABLE FILTER  
Bottom Return  
If the air handler is installed on a platform with bottom re-  
turn, make an airtight seal between the bottom of the air  
handler and the platform to ensure that the air handler op-  
erates properly and safely. Use aluminum tape or mastic  
between the plenum and the air handler cabinet to ensure  
a tight seal. The air handler is equipped with a removable  
bottom panel to facilitate installation.  
RETURN AIR  
PLENUM  
TRANSITION  
Figure 3  
Side Return  
For side return air applications, cut the air handler cabinet  
at the maximum return air dimensions shown on page 2.  
See figure 3 for a typical side inlet arrangement with a tran-  
sition and filter.  
Return Air Base  
For return air with the optional return air base (RAB), see  
figure 4 (and refer to installation instructions provided with  
Return Air Base kit).  
NOTE − Single side inlet applications result in approxi-  
mately a 4 percent reduction of CFM on B−size units and  
approximately a 5 percent reduction of CFM on C−size  
units:  
*NOTE − Both unit and return air base openings must be  
connected to and entirely covered by a single plenum or  
IAQ accessory opening. Optional side return air filter kits  
cannot be used with RAB Return Air Base.  
Optional Return Air Base and Unit Dimensions − Inches (mm)  
4
(102)  
*23 (584) Overall (Max.)  
NOTE − IN SIDE RETURN  
APPLICATIONS, THE RAB  
IS REQUIRED FOR 100%  
CFM CAPACITY.  
*Minimum  
11 (279)  
*Height varies  
with plenum or  
IAQ accessory  
height.  
*Maximum  
14 (356)  
*Unit  
Opening  
Side Return  
Air Openings  
(Either Side)  
AIR FLOW  
7−1/4  
(184)  
5−5/8  
(143)  
*Base  
Opening  
RETURN  
AIR BASE  
23 (584)  
27−5/8 (702)  
17 (432) RAB−B (98M60)  
21 (533) RAB−C (98M58)  
3/4  
(19)  
7/8 (22)  
FRONT VIEW  
SIDE VIEW  
Figure 4  
Page 6  
505047 09/06  
 
 
Removing the Bottom Panel (bottom return or return  
air base configurations)ꢀRemove the two screws that  
secure the bottom cap to the air handler. Pivot the bottom  
cap down to release the bottom panel. Once the bottom  
panel has been removed, reinstall the bottom cap. See fig-  
through the bottom panel and the bottom flange of the  
cabinet.  
2. Install one bolt and two nuts into each hole. Screw the  
first nut onto a bolt and then insert the bolt into a hole.  
A flat washer may be added between the nut and the  
bottom of the unit.  
3. Screw another nut onto the bolt on the inside of the air  
handler base. A flat washer may be added between  
the nut and the bottom of the unit.  
Removing the Bottom Panel  
4. Adjust the outside nut to the appropriate height and  
tighten the inside nut to secure the arrangement.  
Horizontal Applications  
The CBWMV air handler can be installed in horizontal ap-  
plications. Refer to Engineering Handbook for additional in-  
formation. Allow for clearances to combustible materials as  
indicated on the unit nameplate.  
This air handler may be installed in either an attic or a  
crawlspace. Either suspend the air handler from roof raf-  
ters or floor joists, as shown in figure 7. The unit must be  
supported at both ends and beneath the blower deck to  
prevent sagging.  
BOTTOM CAP  
SCREW  
BOTTOM PANEL  
Unit Suspended in Attic or Crawlspace  
Figure 5  
Leveling an Upflow UnitꢀWhen the side return air inlets  
are used in an upflow application, it may be necessary to  
install leveling bolts on the bottom of the air handler. Use  
field−supplied corrosion−resistant 5/16 inch machine bolts  
(4) and nuts (8). See figure 6.  
1/4 IN.  
RODS  
DRAIN  
PAN  
NOTE − Maximum leveling bolt length is 1−1/2 inches.  
ALLOW  
SUFFICIENT  
CLEARANCE  
BETWEEN ROD  
AND UNIT TO  
REMOVE  
Leveling Bolt Installation  
3/8 (10)  
inches (mm)  
1−3/4 (44)  
AIR HANDLER FRONT  
3/8 (10)  
ACCESS PANEL.  
ANGLE IRON  
U−CHANNELS  
Figure 7  
NOTE − Heavy−gauge, perforated sheet metal straps  
(plumbers’ straps) may be used to suspend the unit from  
roof rafters or ceiling joists. When suspending the unit in  
this manner, support must be provided for both the ends  
and themiddleof theairhandlertopreventsagging.Straps  
must not interfere with plenum or water piping. Securing  
screws shouldbe1/2inchfrom thetop edgeand 1−1/2inch  
from thesideedgeinallcases.Coolingcoilsandsupply  
and returnairplenumsmustbesupportedseparately.  
1−3/4 (44)  
LEVELING BOLT  
LOCATIONS  
AIR  
HANDLER  
BOTTOM  
LEVELING BOLT  
LOCATIONS  
3/8 (10)  
NOTE − When the air handler is installed on a platform in a  
crawlspace, it must be elevated enough to avoid water  
damage and to allow the optional evaporator coil to drain.  
3/8 (10)  
1−3/4 (44)  
1−3/4 (44)  
Horizontal and Downflow Applications  
Return air can be brought in through the end of an air han-  
dler installed in the horizontal or downflow application. The  
air handler is equipped with a removable bottom panel to  
Figure 6  
1. Lay the air handler on its back and drill a 5/16 inch di-  
ameter hole in each corner of the air handler’s bottom.  
Page 7  
CBWMV SERIES  
 
 
Refer to figure 12 for schematic wiring diagram and trouble-  
shooting.  
Filter Assembly & Filters  
This unit is not equipped with a filter or rack. A field−pro-  
vided high−velocity filter is required for the unit to operate  
properly. Table 2 lists recommended filter sizes. A filter  
must be in place any time the unit is operating.  
Line Voltage (120V)  
Line voltage field supply conductors are terminated at the  
CBWMV unit. The unit is shipped with the line voltage con-  
nections secured to the lower left coil manifold for left side  
make−up box installations. For right side make−up box  
installations, remove the wire tie that holds the line voltage  
connections and pull excess wires into blower deck/control  
Table 2  
Recommended Filter Sizes  
Filter Size  
Air Handler  
Cabinet Size  
Side Return  
16 X 25 X 1 (1)  
16 X 25 X 1 (1)  
Bottom Return  
16 X 25 X 1 (1)  
20 X 25 X 1 (1)  
Install make−up box (provided for line voltage wiring in the  
17−1/2"  
21"  
Make−up Box Wiring  
Plumbing  
Pipe and Fitting Specifications  
Refer to local building and plumbing codes for approved  
copper pipe and fittings.  
WIRES SHOWN AS SHIPPED,  
ROUTED FOR LEFT SIDE  
MAKE−UP BOX INSTALLATION  
Plumbing Procedures  
Refer to the installation instructions of the water heating  
device to be used with the CBWMV unit. Follow the recom-  
mendations outlined in that instruction as well as govern-  
ing plumbing codes and practices.  
FOR RIGHT SIDE MAKE−UP  
BOX INSTALLATION ꢀ  
REMOVE WIRE TIE,  
PULL EXCESS WIRE INTO  
BLOWER DECK / CONTROL  
BOX AREA.  
Plumbing Checklist  
S
Flush water lines between the CBWMV unit and the  
water heating device before start−up. Normal flushing  
procedures should be used to rid the system of con-  
taminants and foreign debris.  
S
CBWMV units are installed in non-potable systems.  
Electrical  
Wiring and grounding must conform to the current National  
Electric Code ANSI/NFPA No. 70, or Canadian Electric  
Code Part I, CSA Standard C22.1, and local building  
codes. Refer to following wiring diagrams. See unit name-  
plate for minimum circuit ampacity and maximum overcur-  
rent protection size.  
Figure 8  
Interior Make−Up Box Installation  
MAKE−UP  
BOX  
Select the proper supply circuit conductors in accor-  
dance with tables 310−16 and 310−17 in the National  
Electric Code, ANSI/NFPA No. 70 or tables 1 through 4  
in the Canadian Electric Code, Part I, CSA Standard  
C22.1.  
MAKE−UP  
BOX  
CAUTION  
USE COPPER CONDUCTORS ONLY.  
WARNING  
Electric shock hazard. Can cause inju-  
ry or death. Before attempting to per-  
form any service or maintenance, turn  
the electrical power to unit OFF at dis-  
connect switch(es). Unit may have  
multiple power supplies.  
LEFT SIDE  
RIGHT SIDE  
Figure 9  
Page 8  
505047 09/06  
 
 
National Electric Code (ANSI/NFPA No. 70) for the  
USA and current Canadian Electric Code part 1 (CSA  
standard C22.1) for Canada. A green ground wire is  
provided in the field make−up box.  
Electrostatic Discharge (ESD) - Precautions  
And Procedures  
CAUTION  
5. Install the room thermostat according to the instruc-  
tions provided with the thermostat. See table 3 for field  
wiring connections in varying applications. If the air  
handler is being matched with a heat pump, refer to the  
Electrostatic discharge can affect electronic com-  
ponents. Takeprecautionsduringairhandlerinstal-  
lation and service to protect the air handler’s elec-  
tronic controls. Precautions will help to avoid con-  
trol exposure to electrostatic discharge by putting  
the air handler, the control and the technician at the  
sameelectrostaticpotential.Neutralizeelectrostatic  
charge by touching hand and all tools on an un-  
painted unit surface, such as the blower deck, be-  
fore performing any service procedure.  
®
FuelMaster21 installation instruction.  
Removeable Jumpers  
Removeable Jumper DS to Y1ꢀThe factory−installed  
wire jumper that connects terminals DS and Y1 on the TB1  
terminal strip in the control box must be removed when the  
air handler is installed in a system supporting dehumidifi-  
t
cation using a SignatureStat thermostat (e.g., Humidi-  
t
®
trol Enhanced Dehumidification Accessory or Harmony  
zone controls).  
Refer to table 3 for field wiring.  
1. Refer to the CBWMV unit’s nameplate for minimum  
circuit ampacity and maximum overcurrent protection  
size.  
Removeable Jumper R to OꢀThe factory−installed wire  
jumper that connects TB7 (24V) terminal R to TB1 termi-  
nal O must be removed when the air handler is installed in  
applications which include a heat pump unit and the Fuel-  
2. Install a separate disconnect switch (protected by ei-  
ther fuse or circuit breaker) near the air handler so that  
power can be turned off for servicing.  
®
Master21 control board. If the jumper is left intact, termi-  
nal O will remain energized, eliminating the heat mode in  
the heat pump.  
3. Complete the wiring connections to the equipment.  
Use the provided unit wiring diagram and the field wir-  
ing diagrams shown in table 3. Use 18−gauge wire or  
larger that is suitable for Class II rating for thermostat  
connections.  
Removeable Jumper Y1 to Y2ꢀThe factory−installed  
wire jumper that connects Y1 and Y2 on the TB1 terminal  
strip must be removed if two−stage cooling is used. If the  
jumper is not removed the outdoor unit will only operate in  
second−stage cooling.  
4. Electrically ground the unit according to local codes or,  
in the absence of local codes, according to the current  
Table 3  
Thermostat (Application)  
TB1 Y1 to Y2  
TB1 DS to Y1  
TB1 R to O  
Wiring Connections  
SignatureStatt CBWMV  
OUTDOOR  
UNIT  
1 Heat / 1 Cool with  
SignatureStatt Thermostat  
Yes  
No  
(Remove)  
No  
(Remove)  
TERMINALS  
[Single-Stage Heat Pump]  
JUMPERS  
REMOVED  
CBWMV  
SignatureStatt  
TERMINALS  
OUTDOOR  
UNIT  
2 Heat / 2 Cool with  
No  
(Remove)  
No  
(Remove)  
No  
(Remove)  
SignatureStatt Thermostat  
[Two-Stage Heat Pump (Refer  
to FM21 Instructions)]  
ALL JUMPERS  
REMOVED  
ꢁO" terminal used only with heat pumps.  
Page 9  
CBWMV SERIES  
 
 
Indoor Blower Speeds  
Accessory Field Wiring (TB66 & TB67)  
1. When the thermostat is set to ꢁFAN ON," the indoor  
blower will run continuously at approximately 38% of  
the second−stage cooling speed when there is no cool-  
ing or heating demand.  
Connect wires from accessories (e.g. powered air clean-  
ers, humidifiers) to terminal blocks TB66 and TB67 (see  
detail in figure 11).  
2. When the CBWMV is in the heating mode, the indoor  
blower will run on the heating speed designated by the  
position of the HEAT pin.  
3. When there is a cooling demand, the indoor blower will  
run on the cooling speed designated by the position of  
the COOL pin.  
CBWMV Control Box  
TERMINAL BLOCKS  
TB2  
(HOT)  
TB13  
(NEUTRAL)  
TRANSFORMER  
T1  
Accessory Field Wiring (K212)  
Connect field wiring to 3PDT relay K212 (Lennox part  
CB8  
CIRCUIT  
BREAKER  
DOOR  
INTERLOCK  
SWITCH  
Accessory Relay Field Wiring (K212)  
BDC3  
WIRING  
STRAIN  
RELIEF  
VARIABLE  
SPEED  
CONTROL  
1
2
3
BUSHING  
ACCESSORY  
FIELD  
4
5
6
TB66  
WIRING  
TERMINAL  
BLOCKS  
TB67  
TERMINAL  
BLOCK 24V  
7
8
9
K212  
RELAY  
A
B
TERMINAL  
BLOCK TB1  
ACCESSORY RELAY  
24V 125MA 1/4" QUICK CONNECT TERMINALS  
RELAY CONTACTS RATING 8 AMPS @ 120V MAX. 24V COIL  
Figure 11  
Figure 10  
Page 10  
505047 09/06  
 
 
Typical CBWMV Wiring Diagram  
Figure 12  
Page 11  
CBWMV SERIES  
 
 
Continuous Low Blower Option  
Freezestat Operation  
Refer to the blower speed chart located on the CBWMV  
unit wiring diagram for factory set cooling, heating and low  
(continuous) blower speeds. Systems using a cooling ther-  
mostat subbase may operate continuous blower (factory-  
set to operate at 38% of second-stage cooling speed)  
through the FAN−ON switch of the thermostat. For continu-  
ous low blower with a system without a cooling subbase, a  
fan switching subbase may be used.  
IMPORTANT  
Use of the freezestat feature is required in all instal-  
lations using CBWMV units.  
The CBWMV unit is equipped with a field-wired freezestat.  
The freezestat protects the CBWMV system from freezing  
temperatures when the unit is installed in unconditioned  
areas.  
Heating or cooling demand will cause blower to go to heat  
or cool speed.  
The factory-provided freezestat must energize the circula-  
tor when water temperatures fall below 45ºF. Freezestat  
Blower Speed Adjustments  
Diagnostic LEDs  
RUN LED ꢀ Indicates a demand for blower operation in  
either the heating mode or continuous fan−only mode.  
RUN LED will not illuminate during a cooling demand.  
Freezestat Field Wiring  
CFM LED ꢀ Indicates the CFM at which the unit is operat-  
ing. The light flashes once for approximately every 100  
CFM. For example, if the unit is operating at 1000 CFM,  
CFM LED will flash 10 times. If the CFM is 1150, CFM LED  
will flash 11 full times plus one fast or half flash.  
At times the light may appear to flicker or glow. This takes  
place when the control is communicating with the motor  
between cycles. This is normal operation.  
Figure 13  
The appropriate speed according to application and CFM  
need is selected by moving jumper pins.  
BDC3 Variable Blower Control Board  
BDC3 Variable Speed Control Board  
CBWMV units are equipped with a variable speed motor  
that is capable of maintaining a specified CFM throughout  
the external static range. A particular CFM can be obtained  
by positioning jumpers (COOL, HEAT, and ADJUST) on  
the BDC3 control board. The COOL and HEAT jumpers  
are labeled 1, 2, 3, and 4. Each of the numbers corre-  
sponds with an air volume (CFM) setting. The ADJUST  
jumper is labeled TEST, −, +, and NORM. The + and − pin  
settings are used to add or subtract a percentage of the  
CFM selected. The TEST jumper is used to operate the  
motor in the test mode. The DELAY jumper controls ramp-  
ing profiles.  
JP1  
15 PIN PLUG  
(BOARD TO  
MOTOR)  
ACCESSORY  
RELAY CON-  
TACTS  
(DRIVES OP-  
TIONAL  
ACCESSORY  
RELAY)  
OPERATIONAL  
SELECTOR  
PINS  
(AFFECTS  
BOTH  
HEATING AND  
COOLING  
MODES)  
Figure 14 shows the BDC3 control board. Use tables 5  
through 9 to determine the correct air volume for heat and  
cool speed taps.  
Diagnostic LEDs located on the BDC3 control board are  
provided to aid in identifying the unit’s mode of operation.  
Certain scenarios will arise depending on the jumper posi-  
tions. Read through the jumper settings sections before  
adjusting blower speed. Refer to figure14 for identification.  
HEATING SPEED COOLING SPEED  
SELECTOR PINS  
FAN DELAY  
SELECTOR PINS SELECTOR PINS  
DIAGNOSTIC  
LEDS  
Figure 14  
Page 12  
505047 09/06  
 
 
®
For applications with the Harmony Zoning System, the  
Jumper Settings  
blower CFM volume is determined by the Harmony control  
center. The minimum blower speed is predetermined at  
400 CFM for −CBWMV−24B−040 and 36B−070 series units  
and 600 CFM for CBWMV−36C−090, 60C−100, and  
60C−120 series units. This speed is not adjustable.  
IMPORTANT  
Before changing jumper setting, make sure the mo-  
tor has completely stopped. Any jumper setting  
change will not take place while the motor is run-  
ning.  
With the thermostat set for ꢁContinuous Fan" and without a  
call for heating or cooling, the CBWMV will provide 38% of  
the COOL CFM selected.  
Table 4 shows the factory blower speed tap settings for  
CBWMV series units. These settings are for nominal ton-  
nage match−ups with the CBWMV. When matched with  
other sizes, it is recommended that the CFM be adjusted  
approximately to 400 CFM per ton.  
HEAT Pins ꢀ The HEAT jumper is used to determine  
CFM heating. These jumper selections are activated only  
when W1 is energized. (There is a fixed 45 seconds ON  
and 30 seconds OFF delay on a W call.)  
DELAY Pins ꢀ The DELAY jumper is used to set the spe-  
cific motor fan operation during cooling mode. Depending  
on the application, one of four options may be chosen by  
moving the jumper to the appropriate set of pins.  
Table 4  
Factory Blower Speed Tap Settings  
CBWMV  
Blower  
Coil  
Speed Tap Selection  
#1 Pins Jumpered ꢀ  
Cool Pin  
Heat Pin  
Adjust  
Delay  
A
Motor runs at 100% until demand is satisfied.  
−24B−040  
−36B−070  
−36C−090  
−60C−100  
−60C−120  
1
3
3
4
4
2
4
4
4
4
NORM  
NORM  
NORM  
NORM  
NORM  
4
4
4
4
4
OFF  
OFF  
B
Once demand is met, motor ramps down to stop.  
To change jumper positions, gently pull the jumper off the  
pins and place it on the desired set of pins. The following  
section outlines the different jumper selections available  
and conditions associated with each one. Refer to figure  
14.  
#2 Pins Jumpered ꢀ  
A
Motor runs at 100% until demand is satisfied.  
OFF  
OFF  
After the CFM for each application has been determined,  
the jumper settings must be adjusted to reflect those given  
in tables 5 through 9. From the tables, determine which row  
of CFM volumes most closely matches the desired CFM.  
Once a specific row has been chosen (+, NORMAL, or −),  
CFM volumes from other rows cannot be used. Below are  
descriptions of the jumper selections.  
B
C
Once demand is met, motor runs at 100% for 45  
seconds. Then,  
ramps down to stop.  
NOTE − Blower OFF DELAY also applies during heat  
pump operation  
#3 Pins Jumpered ꢀ  
A
B
Motor runs at 82% for approximately 7−1/2 min-  
utes. If demand has not been satisfied after 7−1/2  
minutes,  
ADJUST Pins ꢀ The ADJUST pins allow the motor to run  
at normal speed, approximately 10% higher, or approxi-  
mately 10% lower than normal speed. Tables 5 through 9  
gives three rows (+, NORMAL, and −) with their respective  
CFM volumes. Notice that the normal adjustment setting  
for heat speed position #3 is 1070 CFM. The + adjustment  
setting for that position is 1180 CFM and for the − adjust-  
ment setting is 940 CFM. After the adjustment setting has  
been determined, chose the remainder speed jumper set-  
tings from those offered in the table in that row.  
motor runs at 100% until demand is satisfied.  
OFF  
OFF  
C
Once demand is met, motor ramps down to stop.  
#4 Pins Jumpered ꢀ  
A
B
Motor runs at 50% for 30 seconds.  
The TEST pin is available to bypass the BDC3 control and  
run the motor at approximately 70% to test that the motor is  
operational. This is beneficial primarily in troubleshooting.  
G must be energized for motor to run.  
Motor then runs at 82% for approximately 7−1/2  
minutes. If demand has not been satisfied after  
7−1/2 minutes.  
C
D
Motor runs at 100% until demand is satisfied.  
Once demand is met, motor runs at 50% for 30  
seconds. Then,  
COOL Pins ꢀ The COOL jumper is used to determine the  
CFM during either 1) cooling or 2) heat pump operation  
without a W1 call for electric heat. These jumper selections  
are activated for cooling when Y1 and/or Y2 and DS termi-  
nals in the CBWMV unit are energized and for heating  
when Y1 and/or Y2 is energized.  
OFF  
OFF  
E
ramps down to stop.  
Page 13  
CBWMV SERIES  
 
 
Table 5  
CBWMV−24B−040 Blower Performance  
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range ; Factory Settings: Heating Speed − 2, Cooling  
Speed − 1, Speed Adjust − NORM; Applications with single sided inlets will reduce CFM by approximately 4%.  
BDC3 Jumper Speed Positions  
ꢁADJUST"  
Jumper  
Setting  
1st Stage ꢁCOOL" Speed  
1
2
3
4
cfm  
610  
560  
510  
L/s  
290  
265  
240  
cfm  
770  
700  
630  
L/s  
365  
330  
295  
cfm  
930  
830  
750  
L/s  
440  
390  
355  
cfm  
1010  
910  
L/s  
475  
430  
380  
+
NORM  
810  
ꢁHEAT" Speed  
2nd Stage ꢁCOOL" Speed  
ꢁADJUST"  
Jumper  
Setting  
1
2
3
4
1
2
3
4
cfm  
820  
750  
970  
L/s  
385  
355  
315  
cfm  
990  
900  
810  
L/s  
465  
425  
380  
cfm  
1180  
1070  
940  
L/s  
555  
505  
445  
cfm  
1340  
1230  
1080  
L/s  
630  
580  
510  
cfm  
880  
800  
720  
L/s  
415  
375  
340  
cfm  
1120  
1000  
900  
L/s  
530  
470  
425  
cfm  
1340  
1200  
1080  
L/s  
630  
565  
510  
cfm  
1440  
1300  
1170  
L/s  
680  
615  
550  
+
NORM  
The effect of static pressure and filter resistance is included in air volumes shown.  
1st stage COOL is approximately 70% of the same 2nd stage COOL speed position.  
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.  
Lennox Harmony zone control applications − Minimum blower speed is 400 cfm. Max cfm is the same as 2nd stage cool position.  
Table 6  
CBWMV−36B−070 Blower Performance  
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range ; Factory Settings: Heating Speed − 4, Cooling  
Speed − 3, Speed Adjust − NORM; Applications with single sided inlets will reduce CFM by approximately 4%.  
BDC3 Jumper Speed Positions  
ꢁADJUST"  
Jumper  
Setting  
1st Stage ꢁCOOL" Speed  
1
2
3
4
cfm  
590  
545  
490  
L/s  
280  
255  
230  
cfm  
745  
680  
600  
L/s  
350  
320  
280  
cfm  
895  
805  
725  
L/s  
420  
380  
340  
cfm  
975  
890  
780  
L/s  
460  
420  
370  
+
NORM  
ꢁHEAT" Speed  
2nd Stage ꢁCOOL" Speed  
ꢁADJUST"  
Jumper  
Setting  
1
2
3
4
1
2
3
4
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
+
NORM  
790  
730  
640  
370  
345  
300  
980  
870  
770  
465  
410  
360  
1140  
1040  
920  
540  
490  
435  
1310  
1190  
1070  
620  
560  
505  
850  
775  
700  
400  
365  
330  
1090  
990  
515  
465  
410  
1300  
1190  
1065  
620  
560  
500  
1430  
1280  
1150  
675  
605  
540  
870  
The effect of static pressure and filter resistance is included in air volumes shown.  
1st stage COOL is approximately 70% of the same 2nd stage COOL speed position.  
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.  
Lennox Harmony zone control applications − Minimum blower speed is 400 cfm. Max cfm is the same as 2nd stage cool position.  
Page 14  
505047 09/06  
 
 
Table 7  
CBWMV−36C−090 Blower Performance  
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range ; Factory Settings: Heating Speed − 4, Cooling  
Speed − 3, Speed Adjust − NORM; Applications with single sided inlets will reduce CFM by approximately 5%.  
BDC3 Jumper Speed Positions  
ꢁADJUST"  
Jumper  
Setting  
1st Stage ꢁCOOL" Speed  
1
2
3
4
cfm  
620  
570  
520  
L/s  
290  
270  
245  
cfm  
770  
700  
630  
L/s  
365  
330  
295  
cfm  
930  
830  
760  
L/s  
440  
390  
360  
cfm  
1010  
910  
L/s  
475  
430  
380  
+
NORM  
810  
ꢁHEAT" Speed  
2nd Stage ꢁCOOL" Speed  
ꢁADJUST"  
Jumper  
Setting  
1
2
3
4
1
2
3
4
cfm  
820  
760  
675  
L/s  
385  
360  
320  
cfm  
1000  
900  
L/s  
470  
425  
380  
cfm  
1180  
1070  
950  
L/s  
555  
505  
450  
cfm  
1340  
1220  
1100  
L/s  
630  
575  
520  
cfm  
890  
800  
720  
L/s  
420  
380  
340  
cfm  
1130  
1020  
900  
L/s  
535  
480  
425  
cfm  
1340  
1220  
1100  
L/s  
630  
575  
520  
cfm  
1450  
1310  
1180  
L/s  
685  
620  
555  
+
NORM  
810  
The effect of static pressure and filter resistance is included in air volumes shown.  
1st stage COOL is approximately 70% of the same 2nd stage COOL speed position.  
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.  
Lennox Harmony zone control applications − Minimum blower speed is 400 cfm. Max cfm is the same as 2nd stage cool position.  
Table 8  
CBWMV−60C−100 Blower Performance  
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range ; Factory Settings: Heating Speed − 4, Cooling  
Speed − 3, Speed Adjust − NORM; Applications with single sided inlets will reduce CFM by approximately 5%.  
BDC3 Jumper Speed Positions  
ꢁADJUST"  
Jumper  
Setting  
1st Stage ꢁCOOL" Speed  
1
2
3
4
cfm  
1110  
1000  
930  
L/s  
525  
470  
440  
cfm  
1250  
1130  
1040  
L/s  
590  
535  
490  
cfm  
1380  
1250  
1130  
L/s  
650  
590  
535  
cfm  
1530  
1380  
1260  
L/s  
720  
650  
595  
+
NORM  
ꢁHEAT" Speed  
2nd Stage ꢁCOOL" Speed  
ꢁADJUST"  
Jumper  
Setting  
1
2
3
4
1
2
3
4
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
cfm  
L/s  
+
NORM  
1500  
1370  
1250  
710  
645  
590  
1700  
1540  
1380  
800  
725  
650  
1880  
1720  
1540  
885  
810  
725  
2100  
1920  
1720  
990  
905  
810  
1540  
1400  
1270  
725  
660  
600  
1760  
1600  
1420  
830  
755  
670  
1970  
1800  
1600  
930  
850  
755  
2200  
1980  
1780  
1040  
935  
840  
The effect of static pressure and filter resistance is included in air volumes shown.  
1st stage COOL is approximately 70% of the same 2nd stage COOL speed position.  
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.  
Lennox Harmony zone control applications − Minimum blower speed is 600 cfm. Max cfm is the same as 2nd stage cool position.  
Page 15  
CBWMV SERIES  
 
Table 9  
CBWMV−60C−120 Blower Performance  
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range ; Factory Settings: Heating Speed − 4, Cooling  
Speed − 4, Speed Adjust − NORM; Applications with single sided inlets will reduce CFM by approximately 5%.  
BDC3 Jumper Speed Positions  
ꢁADJUST"  
Jumper  
Setting  
1st Stage ꢁCOOL" Speed  
1
2
3
4
cfm  
1100  
990  
L/s  
520  
465  
440  
cfm  
1250  
1130  
1020  
L/s  
590  
535  
480  
cfm  
1400  
1260  
1130  
L/s  
660  
595  
535  
cfm  
1560  
1400  
1260  
L/s  
735  
660  
595  
+
NORM  
930  
ꢁHEAT" Speed  
2nd Stage ꢁCOOL" Speed  
ꢁADJUST"  
Jumper  
Setting  
1
2
3
4
1
2
3
4
cfm  
1510  
1380  
1240  
L/s  
715  
650  
585  
cfm  
1720  
1560  
1380  
L/s  
810  
135  
650  
cfm  
1900  
1740  
1540  
L/s  
895  
820  
725  
cfm  
2120  
1920  
1720  
L/s  
1000  
905  
cfm  
1570  
1410  
1260  
L/s  
740  
665  
595  
cfm  
1800  
1620  
1440  
L/s  
850  
765  
680  
cfm  
2000  
1820  
1620  
L/s  
945  
860  
765  
cfm  
2200  
2020  
1810  
L/s  
1040  
955  
+
NORM  
810  
855  
The effect of static pressure and filter resistance is included in air volumes shown.  
1st stage COOL is approximately 70% of the same 2nd stage COOL speed position.  
Continuous Fan Only speed is approximately 38% of the same 2nd stage COOL speed position.  
Lennox Harmony zone control applications − Minimum blower speed is 600 cfm. Max cfm is the same as 2nd stage cool position.  
Initial Air Purging  
Air Bleed Valve Location  
After all plumbing connections have been made, leak  
tested and flushed, the water heating device is ready to be  
filled with water and purged of air. Air bleeder valves are  
provided as a convenience for installations that are not  
equipped with purge manifolds.  
1. Make sure electrical power and gas supply to system  
are OFF.  
2. Remove CBWMV coil section access panel.  
3. Remove cap from highest air bleed valve and depress  
valve stem until water is released. This may be done with  
a refrigerant style hose. See figure 15.  
VALVE  
SHOWN  
WITH CAP ON  
4. Replace cap on valve and access panel.  
5. Apply electrical power and gas supply to the system.  
6. Follow the System Start−Up section to operate the sys-  
tem. Complete purging of air after unit has gone  
through initial start−up.  
Figure 15  
Page 16  
505047 09/06  
 
 
2. Motors are pre−lubricated for extended life; no further  
lubrication is required.  
System Adjustments  
Freezestat  
Verify that the freezestat functions.  
Timed−ON and Timed−OFF Delays  
The 45−second timed−ON delay and the 30−second timed−  
OFF delay for heating (time that the blower operates after  
the heat demand has been satisfied) is not adjustable.  
Service Filters  
Filters must be cleaned or replaced when dirty to assure  
proper unit operation.  
Blower Speeds  
Select the blower speed by moving the pins on the variable  
Winterizing CBWMV Water Coil  
Refer to the speed selection chart on unit wiring diagram.  
If unit is installed in an unconditioned space, the piping be-  
tween the CBWMV unit and the water heating device  
should be insulated. If power is removed from the unit, wa-  
ter must be drained from the system to prevent freezing.  
NOTE − To check for proper CFM, take the reading exter-  
nal to the unit. The coil must be dry when you take the  
reading.  
Repair Parts List  
Annual Service  
The following repair parts are available. When ordering  
parts, include the complete unit model number listed on the  
unit rating plate of each piece of equipment.  
WARNING  
Electric shock hazard. Can cause inju-  
ry or death. Before attempting to per-  
form any service or maintenance, turn  
the electrical power to unit OFF at dis-  
connect switch(es). Unit may have  
multiple power supplies.  
Cabinet Parts  
S
Blower Access Panel  
S
Coil Access Panel  
Hot Water Coil Parts  
S
Coil Replacement Kit  
Blower Part  
At the beginning of each heating season, system should be  
checked as follows by a qualified service technician:  
S
S
S
Blower Wheel  
Blower Motor  
Electrical  
1. Check all wiring for loose connections.  
Blower Housing  
Electrical Parts  
2. Check for correct voltage at CBWMV unit (unit operat-  
ing).  
S
S
S
S
BDC3 Board  
Transformer  
3. Check to see that blower is operating.  
Circuit Breaker, 24VAC  
3PDT Relay  
Blower  
1. Check and clean blower wheel.  
Page 17  
CBWMV SERIES  
 
 
WARNING  
WARNING TO SERVICE PERSONS! Electric shock hazard. When electrical power to the internal  
control box components must be available for troubleshooting, a common practice is to  
construct a ꢁby−pass" of the door interlock switch. When such a by−pass is in place, a potential  
shock hazard is present which can cause injury or death. Make sure any door interlock switch  
by−pass has been removed after troubleshooting is complete and BEFORE attempting any re-  
pairs to the control box components!  
Troubleshooting: Continuous Fan Sequence of Operation  
CONDITIONS:  
Power On  
Normal Operation LED: Steady Flash  
NO  
Thermostat (S1) Calls for Continuous Fan, G−Only  
YES  
Check for 24 Volts Between ’G’ and C at A15 Terminal Strip  
Check for 24 Volts Between Pins 3 and 15 on J49  
Blower Operates at the Continuous Fan Speed  
Selected by COOL Jumper and ADJUST Jumper  
Positions on the BDC3 Control (A52)  
NO  
YES  
RUN Light on BDC3 Control (A52) illuminates to Indi-  
cate a Continuous Fan Call  
YES  
CFM Light on A52 Indicates Blower CFM Selection  
with 100CFM / Blink  
YES  
Thermostat (S1) Continuous Fan Demand Satisfied  
YES  
Blower Off  
Page 18  
505047 09/06  
 
 
WARNING  
WARNING TO SERVICE PERSONS! Electric shock hazard. When electrical power to the internal  
control box components must be available for troubleshooting, a common practice is to  
construct a ꢁby−pass" of the door interlock switch. When such a by−pass is in place, a potential  
shock hazard is present which can cause injury or death. Make sure any door interlock switch  
by−pass has been removed after troubleshooting is complete and BEFORE attempting any re-  
pairs to the control box components!  
Troubleshooting: Cooling Sequence of Operation  
CONDITIONS:  
Power On  
Normal Operation LED: Steady Flash  
Thermostat (S1) Provides 24 Volt Cooling Call to In-  
NO  
Check for 24 Volts Between Y and C at A15 Terminal Strip  
door Blower (B3)  
YES  
Blower (B3) Operates at the 2nd Stage  
NO  
Check for 24 Volts  
Between Pins 14 and  
3 on J49  
NO  
Cooling Speed Determined by COOL,  
DELAY and ADJUST Jumper Positions on  
the BDC3 Control (A52)  
2 Stage Condensing Unit?  
YES  
YES  
Blower (B3) Operates at the 1st Stage Cooling Speed  
Determined by COOL, DELAY and ADJUST Jumper  
Positions on the BDC3 Control (A52)  
CFM Light on A52 Indicates Blower CFM  
Selection with 100CFM / Blink  
NO  
YES  
CFM Light on A52 Indicates Blower CFM Selection with  
100CFM / Blink  
Thermostat (S1) Demand Satisfied  
YES  
YES  
Blower Shuts Off According to the DELAY  
Jumper Position on the BDC3 Control  
(A52)  
Check for 24 Volts Between Y  
and C on A15 Terminal Strip  
Check for 24 Volts Between  
Pins 6 and 3 on J49  
YES  
Demand for Cooling Satisfied  
NO  
NO  
Check for 24 Volts Between Y2 on  
TB1 and C on A15 Terminal Strip  
Thermostat (S1) Calls for  
2nd Stage Cooling  
First Stage Demand for Cooling Satisfied?  
YES  
YES  
NO  
Blower Operates at the 2nd  
Stage Cooling Speed Deter-  
mined by COOL, DELAY and  
ADJUST Jumper Positions  
on the BDC3 Control (A52)  
Check for 24 Volts Between Pins 14  
and 3 on J49  
Blower Shuts Off According to the DELAY Jumper  
Position on the BDC3 Control (A52)  
YES  
Demand for Cooling Satisfied  
YES  
CFM Light on A52 Indi-  
cates Blower CFM Selec-  
tion with 100CFM / Blink  
YES  
2nd Stage Thermostat  
(S1) Demand Satisfied  
YES  
Blower Returns to 1st  
Stage Cooling Speed  
Page 19  
CBWMV SERIES  
 
 
WARNING  
WARNING TO SERVICE PERSONS! Electric shock hazard. When electrical power to the internal  
control box components must be available for troubleshooting, a common practice is to  
construct a ꢁby−pass" of the door interlock switch. When such a by−pass is in place, a potential  
shock hazard is present which can cause injury or death. Make sure any door interlock switch  
by−pass has been removed after troubleshooting is complete and BEFORE attempting any re-  
pairs to the control box components!  
Troubleshooting: Heating Sequence of Operation  
CONDITIONS:  
Power On  
Normal Operation LED: Steady Flash  
NO  
Thermostat (S1) Calls for Heat  
Check for 24 Volts Between  
W and C at A52 Terminal Strip  
YES  
Fixed blower−ON delay (45−second) complete  
Blower Operates at the Heating Speed Selected by  
NO  
HEAT Jumper and ADJUST Jumper Positions on  
the BDC3 Control (A52)  
Check for 24 Volts Between Pins 3 and 2 on J49  
YES  
CFM Light on A52 Indicates Blower  
Speed Selection with 100CFM / Blink  
YES  
Thermostat (S1) Demand Satisfied  
YES  
30 Second Blower Off Delay (Fixed) Complete  
YES  
Demand for Heat Satisfied  
Page 20  
505047 09/06  
 
 

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