LENNOX Air Handler (indoor Blower&evap) Manual L0805356

User Manual: LENNOX LENNOX Air Handler (indoor blower&evap) Manual LENNOX Air Handler (indoor blower&evap) Owner's Manual, LENNOX Air Handler (indoor blower&evap) installation guides

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Page Count: 16

®
,B_2008 Lennox Industries Inc,
Dallas, Texas, USA
WARNING
A CAUTION
INSTALLATION
INSTRUCTIONS
Dave Lennox Signature ®
Collection CBX32MV Units
MULTI-POSITION AIR HANDLER
505,343M
05/08
Supersedes 04/08
TeCh nical
blications
Litho U.S.A.
AIMPORTANT
CBX32MV Upflow/Downflow Unit Dimensions .... 2
CBX32MV Horizontal LH/RH Unit Dimensions .... 3
General Information ........................... 3
Shipping and Packing List ...................... 3
Requirements ................................. 3
Installing the Unit .............................. 4
Brazing Connections ........................... 8
Installing the Condensate Drain ................. 8
Inspecting and Replacing Filters ................. 9
Sealing the Unit ............................... 9
Adjusting the BDC3 Blower Control Board ........ 9
Adjusting the Blower Speed .................... 10
Making Electrical Connections .................. 14
Repairing Cabinet Insulation .................... 16
RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
CHECK FOR AND REMOVE THE FOLLOWING ITEMS BEFORE OPERATING UNIT.
BLOWER MOTOR
SHIPPING BOLT
TOP CAP SHIPPING BRACKET (REPLACE
SCREWS IN TOP CAP AFTER REMOVAL)
C
BLOWER HOUSING SUPPORT PAD
B
BLOWER MOTOR SHIPPING
BRACKET
D
HORIZONTAL DRAIN PAN (SEE
UPFL OW APPLICATIONS ON
PAGE 4 AND DOWNFLOW
APPLICATIONS ON PAGE 6 )
E
REFRIGERANT LINE CAPS [SEE
BRAZING CONNECTION ON PAGE 8]
F
CONFIGURATION JUMPERS (IF NECESSARY) (SEE
ADJUSTING THE BDC3 BLOWER CONTROL BOARD
ON PAGE 10.
G
11111;;_i_i!iiiiiii!;i_
05/08
IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Page 1 505,343M
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII]111111111111
3/4 (19)
SUPPLY AIR
OPENING _
LINE VOLTAGE
INLETS (TOP
AND LEFT SIDE)
LOW VOLTAGE
INLETS (TOP AND
RIGHT SIDE)
TOP VIEW 5/8(16)
t
G
i/ OPTIONAL
ELECTRIC HEAT
(
/,
PIPING PLATE DETAIL
(FOR UPFLOW AND DOWNFLOW POSITIONS)
4-s/6(111)
i!_i,i_iliiiliiiiiiiii_ii_ii_'_!iiiii_iiiii!i!iiiiiiiiiiiiiiiiiii_iiii_iii!_i-SUCT,ONL,NE
'ii .CONDENSATEDRA,NS
(2)(HORIZONTAL)
'OO O SAT PFLOWA oORA' S
DOWNFLOW)
_i I I _
_ I_--_18_1,2(89_
SUCTION
LINE \
LINE
OPTIONAL
ELECTRIC HEAT
FIELDqNSTALLED) \
SUCTION
LINE
LOW VOLTAGE
(RIGHT SIDE)
LIQUID LINE VOLTAGE
LINE (LEFT SIDE)
-,,.ILC:_"_b TERAccESSRET0:N--'_'IL 11-1/16
5/6 (16) 5/6 (16) 1 (25) SIDE VIEW 5/6 (16)
FRONT VIEW UPFLOW POSITION
6/6(16)
6/6(16)
1 (25)
SIDE VIEW 5/8 (16)
FILTER ACCESS
DOWNFLOW POSITION
CBX32MV Model Dimensions (Upflow, Downflow, Left- and Right-Hand Horizontal applications)
-018/024 -024/030 -036 -048 and -060 -068
Dim. in. (ram) in. (ram) in. (ram) in. (ram) in. (ram)
A 45-1/4 (1149) 49-1/4 (1251) 51 (1295) 58-1/2 (1486) 64 (1626)
B 16-1/4 (413) 21-1/4 (540) 21-1/4 (540) 21-1/4 (540) 21-1/4 (540)
C 20-5/8 (524) 20-5/8 (524) 22-5/8 (575) 24-5/8 (625) 26-5/8 (676)
D 14-3/4 (375) 19-3/4 (502) 19-3/4 (502) 19-3/4 (502) 19-3/4 (502)
E 19 (483) 19 (483) 21 (533) 23 (584) 25 (635)
F15 (381) 20 (508) 20 (508) 20 (508) 20 (508)
G 24-5/8 (625) 24-5/8 (625) 26-3/8 (670) 27-7/8 (708) 31-3/8 (797)
H 20-5/8 (524) 24-5/8 (625) 24-5/8 (625) 30-5/8 (778) 32-5/8 (829)
505343 05/08
Page 2
CONDENSATE
DRAINS (2)
(UPFLOW AND
DOWNFLOW
5-3/8
LIQUID
CONDENSATE
DRAINS
(HORIZONTAL)
PIPING PLATE
DETAIL 1-1/2
(38)
5/8(15)
5/8(15)
FILTER
gU
/\
LIQUID SUCTION
LINE LINE TOP VIEW
5/8 (16) END VIEW
Horizontal Position
(Left-Hand Air
Discharge)
FILTER ACCESS FRONT VIEW
3/4 (19)
3/4 (19) =
11-1/16
OPTIONAL ELECTRIC
HEAT (FIELDqNSTALLED)
G -_5_/8(16)
OPTIONAL ELECTRIC FILTER SUCTION LIQUID
HEAT (FIELD INSTALLED) LINE LINE
LOW VOLTAGE TOP VIEW
INLETS (TOP AND
LEFT SIDE) 5/8 (16) A P'I
G _'_ H
_1 _
LINE VOLTAGE
INLETS
AND RIGHT
SIDE)
B
LOW VOLTAGE
INLETS
AND RIGHT
SIDE)
Horizontal Position
(Right-Hand Air
Discharge)
FOR DIMENSIONS "A" THROUGH
"H", SEE CHART ON PAGE 2.
/4 (19)
........ f 3/4 (19)
D
/
_--_ 3/4 (19)
END VIEW
4-3/8
(111)
1-1/8
(29)
SUCTION LINE,
PIPING PLATE LIQUID
DETAIL LINE
5/8(15)
D
3/4 (19) L
LINE VOLTAGE INLETS
(BOTTOM AND LEFT SIDE)
END VIEW
CONDENSATE DRAINS
(HORIZONTAL)
FRONT VIEW
FILTER ACCESS
1-1/2 (38)
1 (25)
END VIEW
5/8(15)
5/8(15)
The Dave Lennox Signature TMCollection CBX32MV air
handler units are designed for installation with optional
field-installed electric heat and a matched remote outdoor
unit that is charged with HFC-410A refrigerant. These
units, designed for indoor installation in multiple positions,
are completely assembled for upfiow and horizontal
right-hand discharge before being shipped from the
factory.
These instructions are intended as a general guide and do
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation. Check
equipment for shipping damage; if found, immediately
report damage to the last carrier.
Package 1 of 1 contains the following:
1 -- Assembled air handler unit
2 -- Downfiow shields (if required for downfiow
configuration only)
1 -- Drip shield (for -068 only)
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
heat), MUST conform with the following National Fire
Protection Association (NFPA) standards:
• NFPA No. 90A - Standard for Installation of Air
Conditioning and Ventilation Systems
Page 3
CBX32MV SERIES
• NFPA No. 90B - Standard for Installation of Residence
Type Warm Air Heating and Air Conditioning Systems
This unit is approved for installation clearance to
combustible material as stated on the unit rating plate,
Accessibility and service clearances must take
precedence over combustible material clearances.
WARNING I
WARNING I
CBX32MV units are factory-configured for upload and
horizontal right-hand discharge installation. For downflow
or horizontal left-hand discharge, certain field
modifications are required.
DISASSEMBLE AND REASSEMBLE AIR HANDLER
UNIT
The CBX32MV air handler unit consists of two sections
which are shipped assembled from the factory. If
necessary, the unit may be disassembled to facilitate
setting the unit, Follow the steps below:
To disassemble:
1, Remove access panels,
2, Remove both blower and coil assemblies. This will
lighten the cabinet for lifting.
3. Remove one screw from the left and right posts inside
the unit, Remove one screw from each side on the
back of the unit, Unit sections will now separate,
To reassemble:
1, Align cabinet sections together,
2, Reinstall screws,
3. Replace blower and coil assemblies,
4. Replace access panel,
505343 05/08
UPFLOW APPLICATION
Use the following procedures to configure the unit for
upfiow operations:
Note -(-068 model Only) Remove access panels and the
horizontal drip shield along with the corrugated padding
between the blower and coil assembly before operation.
Discard drip shields from the foam pads on top of the unit.
Shields are used for downflow applications only.
1. The horizontal drain pan must be removed when the
coil blower is installed in the upflow position. Removing
horizontal drain pain will allow proper airflow and
increase efficiency.
2, After removing horizontal drain pan, place the unit in
desired location. Set unit so that it is level. Connect
return and supply air plenums as required using sheet
metal screws as illustrated in figure 1.
3. Install units that have no return air plenum on a stand
that is at least 14" from the floor to allow for proper air
return, Lennox offers an optional upfiow unit stand as
listed in table 1 on page 4,
HORIZONTAL DRAIN PAN
Fq II..,-,-'(MUS T BE REMOVED)
II
UPFLOW/ II
DOWNFLOW _J
DRAIN PAN _ oo
Figure 1. Upflow Configuration
Table 1. Optional Unit Side Stand (Upflow Only)
Models Kit Numbers
-018/024 45K31
-024/030,-036, -048, -060 and
-068 45K32
HORIZONTAL RIGHT-HAND DISCHARGE
APPLICATION
Use the following procedures to configure the unit for
horizontal right-hand discharge operations:
NOTE -For horizontal applications, a secondary drain pan
is recommended. Refer to local codes.
Note -(-068 Model Only) Before operating the unit,
remove access panels and the horizontal drip shield and
the corrugated padding between the blower and coil
assembly. Discard the corrugated padding and the
downflow drip shields from the foam pads on top of the unit.
Note -(-068 Model Only) Install the horizontal shield on
the front edge of the horizontal drain pan as illustrated in
figure 2.
1, No further adjustment is necessary. Set unit so that it is
sloped 1/4 inch towards the drain pan end of the unit,
Page 4
UP-LOAD /DOWNFLOW
DRAIN PAN
HORIZONTAL DRAIN
PAN
HORIZONTAL DRIP SHIELD (-068
MODELS)
DOWNFLOW RAIL
NO ADJUSTMENTIS NECESSARY
Figure 2. Right-Hand Discharge Configuration
2. If the unit is suspended, the entire length of the cabinet
must be supported. If you use a chain or strap, use a
piece of angle iron or sheet metal attached to the unit
(either above or below) to support the length of the
cabinet. Use securing screws no longer than 1/2 inch
to avoid damaging the coil or filter as illustrated in
figure 3. Use sheet metal screws to connect the return
and supply air plenums as required.
HORIZONTAL RIGHT-HAND DISCHARGE
APPLICATION IN HIGH HUMIDITY AREAS
For horizontal applications in high humidity areas remove
the downflow rail closest to the drain pan.
To remove rail:
1. Remove the screws from the rail at the back of unit and
at the cabinet support rail.
2. Remove the downfiow rail then replace screws.
3. Seal around the exiting drain pipe, liquid line, and
suction line to prevent humid air from infiltrating into
the unit.
1/2 IN. SCREWS MAXIMUM
ANGLE IRON OR
.SHEET METAL
it
ELECTRICAL INLET
CLEARANCE 4 IN. (102 MM)
END VIEWFRONT VIEW
Figure 3. Suspending Horizontal Unit
AIMPORTANT
HORIZONTAL LEFT-HAND DISCHARGE
APPLICATION
Use the following procedures to configure the unit for
horizontal left-hand discharge operations:
NOTE -For horizontal applications, a secondary drain pan
is recommended. Refer to local codes.
Note -(-068 Model Only) Remove access panels and
horizontal drip shield from the corrugated padding
between the blower and coil assembly. Discard the
corrugated padding and the downflow drip shields from the
foam pads on top of the unit. (The shields are used for
downflow applications only.)
1. Pull the coil assembly from unit. Pull off the horizontal
drain pan.
2. Remove the drain plugs from back drain holes on
horizontal drain pan and reinstall them on front holes.
AIMPORTANT
3. Rotate drain pan 180° front-to-back and install it on the
opposite side of the coil.
4. Remove screws from top cap. Remove horizontal drip
shield screw located in the center of the back coil end
seal as illustrated in figure 4.
5. Rotate horizontal drip shield 180° front to back.
6. Remove plastic plug from left hole on coil front end
seal and reinstall plug in back hole. Reinstall horizontal
drip shield screw in front coil end seal. Drip shield
should drain downward into horizontal drain pan inside
coil.
7. Rotate top cap 180° front-to-back and align with
unused screw holes. Holes must align with front and
back coil end plates. The top cap has a 45 ° bend on
one side and a 90° bend on the other. The 90° bend
must be on the same side as the horizontal drain pan
as illustrated in figure 4.
NOTE -Be very careful when you reinstall the screws into
coil end plate engaging holes. Misaligned screws may
damage the coil.
8. From the upload position, flip cabinet 90° to the left and
set into place. Replace coil assembly. Secure coil in
place by bending down the tab on the cabinet support
rail as illustrated in figures 4.
9. (-068 Model Only) Install the horizontal shield on the
front edge of the horizontal drain pan as shown in
figure 5.
NOTE -For horizontal applications in high humidity areas,
remove the downflow rail closest to the drain pan. To
remove rail, remove screw from rail at back of unit and at
cabinet support rail. Remove downflow rail then replace
screws. Also, seal around the exiting drain pipe, liquid and
suction lines to prevent infiltration of humid air.
Page 5
CBX32MV SERIES
10, Knock out drain seal plate from access door. Secure
plate to cabinet front flange with screw provided,
11, Flip access door and replace it on the unit.
12. Set unit so that it is sloped 1/4 inch toward the drain
pan end of the unit. Connect return and supply air
plenums as required using sheet metal screws.
13, If suspending the unit, it must be supported along the
entire length of the cabinet. If using chain or strap, use
a piece of angle iron or sheet metal attached to the unit
(either above or below) so that the full length of the
cabinet is supported, Use securing screws no longer
than 1/2 inch to avoid damage to coil or filter as
illustrated in figure 3 on page 5. Connect return and
supply air plenums as required using sheet metal
screws,
DRIP TOP CAP ROTATED TO
SHIELD CORRECT POSITION
\
CABINET _ TOP CAP SCREWS
\
/
DRAIN PAN DRAIN PAN
REINSTALLED SHIPPING
HERE LOCATION
t
DRAIN PLUGS
REINSTALLED HERE REMOVED FROM HERE
COIL SHOWN IN UPLOAD POSITION FOR EASY CONVERSION
ALIGN HOLES
_ WITH HOLES
IN COIL END
PLATE.
TOP
CAP _
90 °BACK COIL
BEND END SEAL
Figure 4. Field Modification for Left-Hand Discharge
HORIZONTAL DRIP SHIELD (_068 MODEL)
Y'- ool I
FRONT EDGE OF HORIZONTAL
DOWNFLOW RAIL DRAIN PAN
Figure 5. Left-Hand Discharge Configuration
DOWNFLOW APPLICATION
Use the following procedures to configure the unit for
downflow operations:
Table 2 outlines the sizes of the various drip shields.
Note -(-068 Model Only) Remove the access panels. If
necessary, remove the horizontal drip shield and
corrugated padding between the blower and coil assembly
before operating the unit. Remove the downflow drip
shields from the foam pads of top of the unit.
1. Remove the coil assembly from the unit,
2, For best efficiency and air flow, remove the horizontal
drain pan from the units in downflow positions as
illustrated in figure 6 on page 6.
3, Rotate cabinet 180° from the upright position. See
figure 6. You may need to first remove the blower
assembly to lighten the cabinet for lifting.
4, Foam tape that is provided creates a seal between the
drip shield and the coil so that water does not leak into
the air stream. The foam tape pieces are precut. Apply
the tape to the drip shields as illustrated in figure 7 and
specified as follows:
•Apply two pieces of foam tape provided down both
ends of each shield. The tape should measure
4-3/4" X 2" (120 X 25 mm). Ensure that the tape
covers both sides of the shield equally,
• Apply the longer piece of 1-inch wide foam tape
between the end pieces of tape.
5. From the underside of the coil, install the downflow drip
shield firmly in place as illustrated in figure 8,
Table 2. Downflow Drip Shields (Tape Required)
Units Part Length Width
Numbers
-018/024 Not Required Not Required Not Required
-024/030 LB-74274 15.875 4.6718
-036 LB-74272 17.875 4.6718
-048, -060, and -068 LB-89864 19.875 4.6718
HORIZONTAL DRAIN PAN
(REMOVE FROM UNIT)
UP-LOAD /"_" -
DOWNFLOW
DRAIN PAN
d
Figure 6. Downflow Discharge Position
505343 05/08
Page 6
SIDE
VIEW
/
2" WIDE FOAM TAPE
DRIP SHIELD
1" WIDE FOAM TAPE (LONGER PIECE)
Figure 7. Applying Foam Tape to Drip Shield
COIL
DRIP PAN
Figure 8. Downflow Drip Shields
6. Replace the coil assembly and blower if you have
removed it. Replace the coil access panel,
7, Set the unit so that it is level. Using sheet metal
screws, connect the return and supply air plenums as
required,
CAUTION
NOTE -For downflow application, metal or class I supply
and return air plenums must be used.
HANDER
COMBUSTIBLE FLOOR
ADDITIVE BASE
,
g,
Figure 9. Combustible Flooring Additive Base
For downflow installation on combustible flooring, an
additive base must be used as illustrated in figure 9 on
page 7.
Cut an opening appropriately sized for combustible
base. Base dimensions are illustrated in figure 10,
After opening has been cut, set the additive base into
opening. Connect outlet air plenum to the additive
base. Set the unit on the additive base so flanges of
the unit drop into the base opening and seal against
the insulation strips. The unit is now locked in place.
Install return air plenum and secure with sheet metal
screws,
1-5/8 (41) TOP VIEW
1-5/8 (41) 4
@18/@24 08-1/4 (464)
@24/@30 and up 23-1/4 (591)
1-5/6(41) SUPPLY AIR OPENING
_m._(610) -068 ON L_,ii.._ INCHES (MM)
I -22-1/6(662)OTHERMODELS-I
I 13-3/8(340) /
6 6(16 D"It
I
Figure 10. Downflow Combustible Base Dimensions
Page 7
CBX32MV SERIES
WARNÁNG
AIMPORTANT
All CBX32MV air handlers are equipped with a
factory-installed, internally mounted check/expansion
valve, which is suitable for use in HFC-410A applications,
Use Lennox L15 (sweat) series line sets as listed in table 3
on page 8, or use field-fabricated refrigerant lines. L10
(flare) line sets may be used by cutting off flare nut, Refer to
the piping section of the Lennox Unit Information Service
Manual for proper size, type and application of
field-fabricated lines.
1!
SUCTION LINE
LIQUID LINE
AIR HANDLER UNIT
Figure 11. Brazing Connections
NOTE: CBX32MV series evaporators use nitrogen or
dry air as a holding charge. If there is no pressure when
the rubber plugs are removed, check the coil or line set
for leaks before installing. After installation, pull a
vacuum on the line set and coil before releasing the unit
charge into the system.
NOTE: Be aware of filter access panel when connecting
lines, Filter must be accessible,
NOTE: See outdoor unit instructions on how to flow
nitrogen through line sets.
1. Remove access panel,
2. Remove the refrigerant line caps from the refrigerant
lines,
3. Use a wet rag to protect TXV sensing bulb (or remove
it) when brazing suction line connections,
4. Place a wet rag against piping plate and around the
suction line connection. The wet rag must be in place
to guard against damage to the paint,
5. With the wet rag in place, position field provided elbow
fitting to air handler's suction line and line set, Start
nitrogen flow before brazing,
6. After the procedure is completed then remove the wet
rag.
7. Place wet rag against piping plate and around the
liquid line connection. Position liquid line elbow to air
handler's suction line and to line set. Start nitrogen flow
and begin brazing both connections and after
procedure is completed then remove both wet rags.
8. Refer to instructions provided with outdoor unit for leak
testing, evacuating and charging procedures.
9. Install access panel.
Table 3. CBX32MV Refrigerant Line Sets
Liquid Vapor/ L10 Line L15 Line
Models Line Suction Sets Sets
Line
-018/024 3/8 (10) 5/8 (16) L10-26 L15-26
20 - 50 ft. 20 - 50 ft,
(6- 15m) (6- 15m)
-024/030 3/8 (10) 3/4 (19) L10-41 L15-41
and -036 20 - 50 ft, 20 - 50 ft,
(6- 15m) (6- 15m)
-048 3/8 (10) 7/8 (22) L10-65 L15-65
30 -50 ft, 30 - 50 ft.
(9- 15m) (9- 15m)
-060 and 3/8 (10) 1-1/8 (29) Field Field
-068 Fabricated Fabricated
Before connecting drain line(s), check drain hole(s) to
verify that drain opening is fully open and free of any
debris. Also check to make sure that no debris has fallen
into the drain pan during installation that may plug up the
drain opening,
505343 05/08
Page 8
Connectmaincondensatedrainandroutedownwardtoan
opendrainorsump.Donotconnectdraintoaclosedwaste
system.See figure 12 for typical condensatetrap
configuration.
VENT MUST EXTEND ABOVE THE HEIGHT OF THE COIL"
DRAIN PAN BY 2 INCHES (51 MM). VENT
DRAIN PAN
TRAP MUST BE DEEP ENOUGH TO OFFSET
MAXIMUM STATIC DIFFERENCE (GENERAL
2 INCHES [51MM]).
TRAP (49P66)
DRAIN LINE SHOULD SLOPE A MINIMUM 1 INCH PER
10 FEET (25 MM PER 3 M) TO APPROVED DRAIN
Figure 12. Typical Condensate Drain
It is recommended that the auxiliary drain be connected to
a drain line for all units. If auxiliary drain is not connected, it
must be plugged with provided cap. For downflow units,
the auxiliary drain MUST be connected and routed to a
drain. See figure 13 for auxiliary and main drain locations.
LEFT-HAND UPFLOW OR RIGHT-HAND
DISCHARGE DOWNFLOW DISCHARGE
AUXILIARY DRAIN ON LEFT
oo ]
MAIN DRAIN ON RIGHT
Figure 13. Auxiliary and Main Drain Locations
The following practices are recommended to ensure
condensate removal:
• Drain piping should not be smaller than the drain
connections at drain pan.
• A trap must be installed in the main drain line.
• The trap must be deep enough to offset the difference
in static pressure between drain pan and atmosphere.
Generally, two inches is satisfactory for medium static
applications.
• Horizontal runs must be sloped 1-inch per 10 feet of
drain line to offset friction.
• An open vent in the drain line, as illustrated in figure 12,
should be used to overcome line length, friction and
static pressure.
• Drains should be constructed in a manner to facilitate
future cleaning and not interfere with filter access as
illustrated in figure 12 on page 9.
• Auxiliary drain should run to an area where
homeowner will notice it draining. The auxiliary drain
line does not required venting or a trap. Refer to local
codes.
AIMPORTANT
Filters may be duct-mounted or installed in the cabinet. A
filter is installed at the factory. Note that filter access door
fits over access panel. Air will leak if the access panel is
placed over the filter door.
Filters should be inspected monthly and must be cleaned
or replaced when dirty to assure proper furnace operation.
Units are equipped with standard throw-away type filters
which should be replaced when dirty.
To replace filter:
1. Loosen the thumbscrews holding the filter panel in
place.
2. Slide the filter out of the guides on either side of
cabinet.
3. Insert new filter.
4. Replace panel.
See table 4 for replacement filter sizes.
Table 4. Filter Dimensions
Unit Model No. Filter Size Inches (mm)
-018/024 15 X 20 (381 X 508)
-024/030 20 x 20 (508 x 508)
-036 20 x 22 (508 x 559)
-048 and -060 20 x 24 (508 x 610)
-068 20 x 25 (508 x 635)
Seal the unit so that warm air is not allowed into the
cabinet. Warm air introduces moisture, which results in
water blow-off problems. This is especially important when
the unit is installed in an unconditioned area.
Make sure the liquid line and suction line entry points are
sealed with either the provided flexible elastomeric thermal
insulation, or field provided material (e.g. Armaflex,
Permagum or equivalent). Any of the previously mention
materials may be used to seal around the main and
auxiliary drains, and around open areas of electrical inlets.
CBX32MV 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 jumpers are labeled 1,2, 3, and 4. This indicates the
selected air volume (CFM). 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 the timing pattern in
which the fan delay occurs.
Page 9
CBX32MV SERIES
Figure 14 illustrates the BDC3 control board. Use either
table 8 on page 11, or table 9 on page 12 to determine the
correct air volume for heat and cool speed taps.
JP1 15PIN
PLUG (BOARD
TO MOTOR)
ACCESSORY
RELAY CONTACT_
(DRIVES OPTIONAL
ACCESSORY
RELAY)
O JPL
ooooo
LENNOX
©
OPERATIONAL _lV + 3 3
SELECTOR PINS _2
(AFFECTS BOTH , _J TEST ,_Jl
HEATING AND ADJUST HEAT COOL
COOLINGMODES) O !HE,_ /
HEATING SPEED /
SELECTOR PINS /DIAGNOSTIC
COOLING SPEED FAN DELAY LEDS
SELECTOR PINS SELECTOR PINS
Figure 14. BDC3 Variable Speed Control Board
Selections
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
positions. Read through the jumper settings sections
before adjusting blower speed. Refer to figure 14 on page
10 for identification.
Diagnostic LEDs
1. RUN LED indicates there is a demand for the blower
motor to run.
2. CFM LED indicates the cubic feet per minute at which
the unit is operating. 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 is
normal and occurs when the control is communicating with
the motor between cycles.
The appropriate speed, according to application and CFM
need, is selected by moving jumper pins.
JUMPER SETTINGS
A, IMPORTANT
Table 5 lists the recommended factory blower speed tap
selections for CBX32MV series units. These settings are
for nominal tonnage match-ups with the CBX32MV. When
matched with other sizes, it is recommended that the CFM
be adjusted to approximately 400 CFM per ton.
Table 5. Recommended Blower Speed Taps
Speed Tap Selection
CBX32MV
Air Handler Note 2. Note 4.
4318/024, -024/030 and COO L H EAT
-036 PIN #3 PIN #4
COOL HEAT
-048 PIN #2 PIN #1
COOL HEAT
-060 PIN #3 PIN #1
COOL HEAT
-068 PIN #3 PIN #4
Cooling Heating*
Note 1. Note 3.
COOL HEAT
PIN #3 PIN #4
COOL HEAT
PIN #2 PIN #1
COOL HEAT
PIN #3 PIN #1
COOL HEAT
PIN #3 PiN #4
NOTES -
1. Condensing Unit
2. Heat Pump
3. Condensing Unit with electric heat only
4. Heat Pump with electric heat
*Minimum setting for heat
To change jumper positions, gently pull the jumper off the
pins and insert it onto the desired set dpins. The following
section outlines the different jumper selections available
and conditions associated with each one as illustrated in
figure 14 on page 10.
After the CFM for each application has been determined,
the jumper settings must be adjusted to reflect those given
in either table 8 on page 11, or table 9 on page 12. 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.
ADJUST JUMPER
The ADJUST pins allow the motor to run at normal speed,
approximately 10% higher, or approximately 10% lower than
normal speed. Table 8 on page 11 lists three rows (+,
NORMAL, and -) with their respective CFM volumes. Notice
that the normal adjustment setting for heat speed position #3
is 1315 CFM The + adjustment setting for that position is
1445 CFM and for the - adjustment setting is 1185 CFM
After the adjustment setting has been determined, choose
the remaining speed jumper settings from those offered in
the table in that row.
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.
COOL JUMPER
The COOL jumper is used to determine the CFM during
either cooling or heat pump operation without a call for
electric heat. These jumper selections are activated for
cooling when Y2 and DS terminals in the CBX32MV are
energized and for heating when Y2 is energized.
505343 05/08
Page 10
Applicationswithout the Lennox SignatureStat'"
thermostatwill provide70%of the COOLCFMduring
first-stagecoolingfor two-stageoutdoorunits.100%of
COOLspeedisprovidedforsystemswithasingle-stage
outdoorunits.
Applicationswith the LennoxSignatureStatthermostat
but no demandfor de-humidificationwill operateas
follows:duringafirst-stagecoolingcall(two-stageoutdoor
unit),theairvolumeis70%oftheCOOLjumperselection.
Fora normalCOOL(Pin#2settingfor CBX32MV-036),
theCFMis 1125;thereducedspeedis788CFM(1125x
70%= 788).Thisarrangementprovidesfor additional
dehumidificationduringstandardfirst-stagecooling.See
tables11and12forvariousscenariosconcerninguseof
theSignatureStatthermostatandtheCBX32MVseries
unit.
For applicationswith HarmonyII(_)zonecontrol,the air
handlerCFMvolumeis determinedby the HarmonyII
control center. The minimum Blower speed is
predeterminedat300CFMfor-024/030units,650CFMfor
-036seriesunits,and850CFMfor -048,-060and-068
seriesunits.Thisspeedisnotadjustable.Seefootnotesin
tables8and9onpage12.
WiththethermostatsetforContinuous Fan and without a
call for heating or cooling, the CBX32MV will provided 50%
of the COOL CFM selected.
NOTE -For two-stage heat pumps, air handler will operate
at 70% of the COOL selection until supplemental electric
heat is demanded. At that time, the air handler will operate
at the HEAT speed selected. This arrangement provides
for warmer supply air during second-stage heating.
ADJUST
Jumper
Se_ing
+
NORM
Table 6. CBX32MV-018/024 Air Handler Performance (0 through 0.80 in. w.g. [0 -- 200 Pa]
External Static Pressure Range)
BDC3 Jumper Speed Position
HEAT Speed
1 2 3 4
cfm L/s cfm L/s cfm L/s cfm
715 337 855 403 1000 472 1130
670 316 770 363 900 424 1035
580 273 700 330 800 377 930
L/s cfm
533 465
488 425
438 385
COOL Speed*
234
L/s cfm L/s cfm L/s cfm L/s
219 690 325 900 424 1050 495
200 820 292 825 389 950 448
181 560 264 735 346 850 401
*First-stage (two-stage units only) cooling is approximately 70% of the COOL speed rating.
Continuous fan speed is approximately 50% of COOL speed rating.
Lennox Harmony IICR)Zone Control Applications - Minimum air handler speed is approximately 300 cfm (145 L/s).
NOTE - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
ADJUST
Jumper
Setting
+
NORM
Table 7. CBX32MV-024/030 Air Handler Performance (0 through 0.80 in. w.g. [0 -- 200 Pa]
External Static Pressure Range)
BDC3 Jumper Speed Positions
HEAT Speed
1 2 3 4
cfm Us cfm Us cfm Us cfm
800 380 935 440 1070 505 1210
725 340 850 400 975 460 1100
655 310 765 360 880 415 990
Us cfm
570 660
520 600
470 540
COOL Speed*
234
Us cfm Us cfm Us cfm Us
310 880 415 1100 520 1320 625
285 800 380 1000 470 1200 565
255 720 340 900 425 1080 510
*First-stage (two-stage units only) cooling is approximately 70% of the COOL speed rating.
Continuous fan speed is approximately 50% of COOL speed rating.
Lennox Harmony II_.R_Zone Control Applications - Minimum air handler speed is approximately 300 cfm (145 L/s).
NOTE - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
Table 8. CBX32MV-036 Air Handler Performance (0 through 0.80 in. w.g. [0 -- 200 Pa]
External Static Pressure Range)
BDC3 Jumper Speed Positions
ADJUST HEAT Speed COOL Speed*
Jumper 1 2 3 4 1 2 3 4
Setting cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
+ 1230 580 1335 630 1445 680 1545 730 1090 515 1225 580 1380 650 1545 730
NORM 1120 530 1215 575 1315 620 1400 660 975 460 1125 530 1275 600 1400 660
-- 1010 475 1200 565 1185 560 1265 595 900 425 1000 470 1135 535 1265 595
*First-stage (two-stage units only) cooling is approximately 70% of the COOL speed rating.
Continuous fan speed is approximately 50% of COOL speed rating.
Lennox Harmony lie) Zone Control Applications - Minimum air handler speed is approximately 380 cfm (145 L/s).
NOTE - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
Page 11
CBX32MV SERIES
Table 9. CBX32MV-048 and -060 Air Handler Performance (0 through 0.80 in. w.g. [0 -- 200 Pa]
External Static Pressure Range)
BDC3 Jumper Speed Positions
ADJUST
Jumper
Setting
+
NORM
HEAT Speed
1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s
1850 875 1960 925 2090 985 2150 1015
1705 805 1800 850 1900 895 2005 945
1560 735 1625 765 1720 810 1770 835
COOL Speed*
1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s
1625 765 1820 860 2055 970 2145 1010
1425 670 1625 765 1805 850 2005 945
1205 570 1375 650 1555 735 1725 815
*First-stage (two-stage units only) cooling is approximately 70% of the COOL speed rating.
Continuous fan speed is approximately 50% of COOL speed rating.
Lennox Harmony II¢_ Zone Control Applications - Minimum air handler speed is approximately 400 cfm (190 Lls).
NOTE - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
ADJUST
Jumper
Setting
+
NORM
Table 10. CBX32MV-068 Air Handler Performance (0 through 0.80 in. w.g. [0 -- 200 Pa]
External Static Pressure Range)
BDC3 Jumper Speed Positions
HEAT Speed
1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s
1875 885 1975 930 2090 985 2150 1015
1760 830 1825 860 1920 905 2030 955
1550 730 1650 775 1725 815 1800 850
COOL Speed*
1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s
1640 775 1840 870 2075 980 2150 1010
1465 690 1625 765 1800 850 2000 945
1250 590 1390 655 1560 735 1720 810
*First-stage (two-stage units only) cooling is approximately 70% of the COOL speed rating.
Continuous fan speed is approximately 50% of COOL speed rating.
Lennox Harmony II "_:Zone Control Applications - Minimum air handler speed is approximately 500 cfm (235 L/s).
NOTE - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
Table 11. Typical CBX32MV Single-Stage Outdoor Unit Operating Sequence
Operating Sequence
Thermostat Demand
System
Condition Step I I
Y1 Y210 IG Wl W2
I I
NO CALL FOR DEHUMIDIFICATION
Relative Humidity
Status D
Com-
pressor
Air
Handler
CFM
(COOL)
Comments
Normal
Operation 1 On On On Acceptable 24 VAC High
Compressor and indoor
100% air handler follow thermo-
stat demand
BASIC MODE (only active on a Y1 thermostat demand)
Normal
Operation 1 On On On Acceptable 24 VAC
Dehumidification
Call 2 On On On Demand 0 VAC
High
High
100% SignatureStat " ener-
gizes Y1 and de-ener-
60%/65 glzes D on a call for de-
70%* humidification
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal
Operation
Dehumidification
call
Dehumidification
call ONLY
1 On On On Acceptable 24VAC
2 On On On Demand 0VAC
1 On On On Demand 0VAC
Jumpers at indoor unit with a single stage outdoor unit
With Condensing unit - Y1 to Y2 and R to O
With Heat Pump - Y1 to Y2
High
High
High
100%
60%/65%
70%*
60%/65%
70%*
Dehumidification mode
begins when humidity is
greater than set point
SignatureStat will try to
maintain room humidity
setpoint by allowing the
room space to maintain a
cooler room thermostat
setpoint**
* During dehumidification, cooling air handler speed is as follows: 70% of COOL cfm for 018/024, 024/030, 65% for 036, 60% for048 and 060 units.
** In precision mode, SignatureStat _ thermostats built BEFORE October 2003 will maintain the room temperature up to 3°F (1.8°C) cooler than room
thermostat setting. Thermostats built AFTER October 2003 will maintain the room temperature up to 2°F (1.2°C) cooler than the room thermostat set-
ting in precision mode.
505343 05/08
Page 12
Table 12. CBX32MV SignatureStat'" Thermostat and Two-Stage Outdoor Unit Operating Sequence
Operating Sequence ' System Demand • System
Air
Thermostat Demand Relative Humidity Handler
System ICom- CFM
Condition Step Y1 Y2 O G W1 IW2 Status D pressor (COOL) Comments
NO CALL FOR DEHUMIDIFICATION
Normal Operation -
Y1 1 On On On Acceptable 24 VAC Low 70%
Normal Operation -
Y2 2 On On On On Acceptable 24VAC High 100%
Compressor and indoor
air handler follow thermo-
stat demand
Room Thermostat Calls for First-Stage Cooling
BASIC MODE (only active on a Y1 thermostat demand)
NormaIOperation 1 On On On Acceptable 24VAC Low
Dehumidification 2 On On On On Demand 24VAC High
Call
70%
60%/65%
70%*
Signatures[at energizes
Y2 and de-energizes D
on a call for dehumidifi-
cation
PRECISION MODE (operates independent of a Y1 thermostat demand)
NormaIOperation 1 On On On Acceptable 24VAC Low
Dehumidification
call 2 On On On On Demand 0VAC High
Dehumidification
call ONLY 1 On On On On Demand 0VAC High
70%
60%/65%
70%*
60%/65%
70%*
Room Thermostat Calls for First- and Second-Stage Cooling
BASIC MODE (only active on a Y1 thermostat demand)
NormaIOperation 1 On On On On Acceptable 24VAC High 100%
Dehumidification 60%/65%
Call 2 On On On On Demand 0VAC High 70%*
Dehumidification mode
begins when humidity is
greater than set point
Signatures[at will try to
maintain room humidity
setpoint by allowing the
room space to maintain a
cooler room thermostat
setpoint**
Signatures[at energizes
Y2 and de-energizes D
on a call for dehumidifi-
cation
Normal Operation
Dehumidification
call
PRECISION MODE (operates independent of a Y1 thermostat demand)
1 On On On On Acceptable 24VAC
2 On On On On Demand 0VAC
Dehumidification
call ONLY 1 On On On On Demand 0VAC
High
High
High
100%
60%/65%
70%*
60%/65%
70%*
Jumpers at indoor unit with a two-stage outdoor unit
With Condensing unit - Y2 and R to O
With Heat Pump - none
Dehumidification mode
begins when humidity is
greater than set point
SignatureS[at will try to
maintain room humidity
setpoint by allowing the
room space to maintain a
cooler room thermostat
setpoint**
o o o
*During dehumidification, cooling air handler speed is as follows: 70 Yoof COOL cfm for 018/024, 024/030, 65 Yofor 036, 60 Yofor 048 and 060 units.
** In precision mode, SignatureStat' thermostats built BEFORE October 2003 will maintain the room temperature up to 3°F (1.8°C) cooler than room thermostat setting. Thermostats built AFTER
October 2003 will maintain the room temperature up to 2°F (f.2°C) cooler than the room thermostat setting in precision mode.
HEAT JUMPER #1 Pins Jumpered --
The HEAT jumper is used to determine CFM during
electric heat operation only. These jumper selections are
activated only when W1 is energized.
DELAY JUMPER
The DELAY jumper is used to set the specific 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.
A Motor runs at 100% until demand is satisfied.
A B
B Once demand is met, motor ramps down to stop.
#2 Pins Jumpered --
AMotor runs at 100% until demand is satisfied.
A B C
Page13
CBX32MV SERIES
B Once demand is met, motor runs at 100% for 45
seconds. Then,
C ramps down to stop.
NOTE -Air HandlerOFF DELAY also applies during
heat pump operation
#3 Pins Jumpered --
A Motor runs at 82% for approximately 7-1/2
minutes. If demand has not been satisfied after
7-1/2 minutes,
B motor runs at 100% until demand is satisfied,
WARNING
C
A B/ C
Once demand is met, motor ram )s down to stop,
#4 Pins Jumpered --
A Motor runs at 50% for 30 seconds,
B Motor then runs at 82% for approximately 7-1/2
minutes. If demand has not been satisfied after
7-1/2 minutes,
C Motor runs at 100% until demand is satisfied,
D Once demand is met, motor runs at 50% for 30
seconds, Then,
BCD
A_j !
E ramps down to stop,
Wiring must conform to the current National Electric Code
ANSl/NFPA No. 70, or Canadian Electric Code Part I, CSA
Standard C22.1, and local building codes. Refer to
following wiring diagrams. See unit nameplate for
minimum circuit ampacity and maximum over-current
protection size.
Select the proper supply circuit conductors in
accordance 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.
This unit is provided with holes for conduit. Use provided
caps to seal holes not used. Refer to figure 16 for unit
schematicwiring diagram. Refertofigures 15 through 17
on page 16 for typical field wiring.
Separate openings have been provided for 24V low
voltage and line voltage. Refer to the dimension illustration
of specific location.
SIGNATURESTAT
OUTDOORf'_ ....... THERMOSTAT OUTDOORf_ .......
SENSOR _"_"_'_'_'_'___J_l M 27 O R 81 M27 SENSOR
I I I I I I t I ] I I
I
I I
[] J i
I
[] J
[]
AN
1 i
....
I
Y1 _'- --RJ
c 100604M3
I
I
I
I
I
I
!
I
I
I
J
III
III
III
III
' I
I
I i__j
I
I
I
I
I
I
OUTDOOR SENSOR_ IF USED,
REQUIRES SEPARATE CABLE
FROM T'STAT TWISTED PAIR,
22AWG MINIMUM, 300 FT MAX,
(LNX. CAT, #84X49)
FACTORY
WIRZNG
FIELD
WIRING
[]
[]
>
eo
x
D=:L 4
I
0 _ / -I
I I
[] 1 '
I
I
Y2 1
I
I
I
J
I
I
I
I
I
I
J
L-.... --i--4---
I
J I I
v- I I
Ij I
i I
, J
1
I
J
I
I
I
I
I
I
_J
(with Electric Heat)
100604M4
AC - ONE STAGE AC - TWO STAGE
Figure 15. Field Wiring: Cooling Application
505343 05/08
Page 14
FIELD WIRING FOR UNITS
WITHOUT CIRCUIT BREAKERS
CIRCUIT 2z_Tr_B _ Z_FL- _
/,XL3_
EQUIPMENT
OROUNO
//k CONNECT POWER WIRES FRSM HEATER LABELED LI,L2 ON
"P" VOLTAGE UNITS AND LI.L2,L3 ON "Y" VOLTAGE
UNITS TO TS2 TERMINAL STRIP IN INDOOR UNIT
/_k EOUIPUENT GROUND LOCATED IN INDOOR UNIT
\ -2
/
\-6
/
DESCRIPTION
KEY COMPONENT
AI5 CONTROL-BLOWER DRIVE
B3 MOTOR-BLOWER
CO8 CIRCUIT BREAKER
FI FUSE-TRANSFORMER
J2 JACK-ELECT. HEAT
J46 JACK-OUTPUT
J48 JACK-MOTOR.VAR SPD
J49 JACK-MOTOR.VAR SPD
K20.-E.2 RELAY-BLOWER
P46 PLUG-OUTPUT
P48 PLUG-MOTOR.VAR SPO
P49 PLUG-MOTOR.VAR SPD
TI TRAN£FORMER-CONTRnl
TBI TERM STRIP-CLASS II
_J48
-3
EOUIP
GROUND
CIRCUIT I Z_ (_
K20
Ll
Z> >__LACK
- L2=
FIELD WIRING FOR
UNITS WITH CIRCUIT BREAKERS
CIRCUIT €CIRCUIT 3 CIRCUIT 2
_,,co3/k A cBzA /_ _'/k
L, -- -
L2 L2 _-- L'_ i
z_L3_II""_ --Z_L3_II'B iZ_L3111.1 --
II-LZ EQUIPMENT I_-E EQUIPMENT I_-I_ EQUIPMENT
OROUNO GRSUNO OR RS
Z_ L3 IS NOT PRESENT ON (P) ELECTRIC HEATERS
A_ THE NUMBER OF CIRCUITS VARY ACCORDING
TO HEATER MODEL. REFER TO FAN COIL
NAMEPLATE FOR ACTUAL NUMBER EMPLOYED
-.a----INDICATES OPTIONAL COMPONENTS
_LINE VOLTAGE FIELD WIRING
-- --CLASS II VOLTAGE FIELD WIRING
r
_ TOI
SLACK
ORANGE
RECOMMENDED BLOWER SPEED TAP SELECTION
SPEED TAP
"COOL"
CBX52MV
BLOViER CONOEN£- NEAT
COIL ING UNIT PUMP
-018/ COOL COOL
024 PIN t3 PIN _3
-024/ COOL COOL
0_,0 PIN ,3 PIN =5
COOL COOL
-056 PIN _3 PIN _3
COOL COOL
-048 PIN ,2 PIN ,2
-060 COOL COOL
PIN .3 PIN o3
COOL COOL
-068 PIN _3 PIN #3
,MINIMUM SETTING FOR HEAT
SELECTION
"HEAT"
.CONDENS- "HEAT
]NG UNIT PUMP WITH
WITH ELECTRIC
ELECTRIC HEAT
HEAT ONLY
HEAT HEAT
PIN ,€ PIN ,4
HEAT HEAT
PIN .4 PIN 14
HEAT HEAT
PIN we PIN 1€
HEAT HEAT
PIN 'I PIN "I
HEAT HEAT
PIN tl PIN _1
HEAT HEAT
PIN _4 PIN _4
2€V POWER R
A
4k _ os
ECON
BLOWER -G
-A-UX HEAT I Wl
-A_X HEAT 2 W2
I
W
n-
COOL/HEAT 2 Y2
REV VALVE 0
COOL/HEAT I YI
REFER TO FACTORY BLOWER SPEED TAP SELECTION
CHART BELOW FOR SLOWER SPEED INFORMATION
USE COPPER CONDUCTORS ONLY. REFER TO UNIT
NAMEPLATE FOR MINIMUM CIRCUIT AMPACITY
AND MAXIMUM OVERCURRENT PROTECTION SIZE
NOTE-FOR NON-HEAT PUMP APPLICATION ONLY--
WHEN TWO STAGE THERMOSTAT IS USED,CONNECT
SECOND STAGE HEAT BULB TO TERMINAL "W2" AND
REMOVE JUMPER BETWEEN TERMINALS "R" &*W2"
JUMPER "R" TO "0" IS USED WITH CONDENSING
UNIT. REMOVE "R" TO "0" JUMPER WHEN HEAT
PUMP IS USED.
A REMOVE JUMPER BETWEEN "OS" AND "YI" WHEN
HUMIDITY CONTROL {CCO,-AZO)IS USED.
JUMPER "Y," TO "Y2" IS FOR SINGLE STAGE COOLING.,
L£-k REMOVE JUMPER "YI" TO "Y2" FOR TWO STAGE COOLING. I
24V
COMMON
Figure 16. CBX32MV Air Handler Unit Typical Wiring Diagram
Page 15
CBX32MV SERIES
SIGNATURESTAT '"
THERMOSTAT
51M28 OR 81M28
OUTDOOR SENSOR, IF USED,
REQUIRES SEPARATE CABLE
FROM T'STAT TWISTED PAIR,
22AWG MINIMUM, 300 FT MAX,
(LNX, CAT, #84X49>
FACTORY
WIRING
FIELD
WIRING
HP - ONE STAGE
OUTDOOR
SENSOR
I I I I\ I _ I t
f'5"1=- -- J I I H .L .--I- J
L.?_J- -_ I I
I
> _ .... _---J I
m -.. I J
r'_ _'-.. J ]
oa m "1_1 I
°F-_ hEiil
Jl I
IIII
uza'x iI11
,ilL
YI ii I
R_- jIt
8_E--J I
HP -
(with Electric Heat)
100604M1
TWO STAGE
,IMPORTANT
WARNING
Figure 17. Field Wiring: Heat Pump
temperature/humidity difference between the inside and
outside of the cabinet can cause condensation on the
inside or outside of the cabinet which leads to sheet metal
corrosion and subsequently, component failure.
REPAIRING DAMAGED INSULATION
Areas of condensation on the cabinet surface are an
indication that the insulation is in need of repair.
If the insulation in need of repair is otherwise in good
condition, the insulation should be cut in an X pattern,
peeled open, glued with an appropriate all-purpose glue
and placed back against the cabinet surface, being careful
to not overly compress the insulation so the insulation can
retain its original thickness. If such repair is not possible,
replace the insulation. If using foil-faced insulation, any
cut, tear, or separations in the insulation surface must be
taped with a similar foil-faced tape.
Matt or foil-faced insulation is installed in indoor equipment
to provide a barrier between outside air conditions
(surrounding ambient temperature and humidity) and the
varying conditions inside the unit. If the insulation barrier is
damaged (wet, ripped, torn or separated from the cabinet
walls), the surrounding ambient air will affect the inside
surface temperature of the cabinet. The Figure 18. Repairing Insulation
505343 05/08
Page 16

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