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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INSTALLATION
INSTRUCTIONS

®
,B_2008 Lennox

Industries

Inc,

Texas,

USA

Dallas,

Dave Lennox Signature ®
Collection CBX32MV Units

WARNING

MULTI-POSITION
505,343M
05/08
Supersedes 04/08

A CAUTION

AIR HANDLER
TeCh
n i cal
blications
Litho U.S.A.

CBX32MV Upflow/Downflow Unit Dimensions
CBX32MV Horizontal LH/RH Unit Dimensions
General Information ...........................

....
....

Shipping and Packing List ......................
Requirements .................................
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 Cabinet Insulation ....................

A IMPORTANT

RETAIN

THESE

CHECK

INSTRUCTIONS

FOR AND REMOVE

FOR FUTURE

THE FOLLOWING

ITEMS BEFORE

2
3
3
3
3
4
8
8
9
9
9
10
14
16

REFERENCE

OPERATING

UNIT.

BLOWER MOTOR
SHIPPING BOLT
BLOWER

HOUSING

SUPPORT

PAD

B
HORIZONTAL
DRAIN PAN (SEE
UPFL OW APPLICATIONS
ON
PAGE 4 AND DOWNFLOW
APPLICATIONS

ON PAGE 6 )

E
TOP CAP SHIPPING BRACKET (REPLACE
SCREWS IN TOP CAP AFTER REMOVAL)

BLOWER

MOTOR SHIPPING
BRACKET

D
REFRIGERANT
LINE CAPS [SEE
BRAZING CONNECTION ON PAGE 8]

CONFIGURATION
JUMPERS (IF NECESSARY)
(SEE
ADJUSTING
THE BDC3 BLOWER CONTROL BOARD
ON PAGE 10.

05/08

IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

11111;;_i_i!iiiiiii!;i
_

Page 1

505,343M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

PIPING PLATE DETAIL
(FOR UPFLOW AND DOWNFLOW
POSITIONS)

3/4 (19)

6/6(16)

SUPPLY AIR
OPENING

4-s/6(111)

i!_i,i_ili
iiliiiiiiiii_ii_ii_'_!i
iiii
_iiiii
!i!iiiii
iiiiiiiiiiiiii_iiii_iii!_i
-SUCT,ON
L,NE
'ii

. CONDENSATEDRA,NS

6/6(16)

(2)(HORIZONTAL)

'OO O

SAT

DOWNFLOW)

LOW VOLTAGE
INLETS (TOP AND
RIGHT SIDE)

LINE VOLTAGE
INLETS (TOP
AND LEFT SIDE)
TOP VIEW

1 (25)

I_--_18_1,2(89_
FILTER ACCESS

5/8(16)

SUCTION
LINE

G
ELECTRIC
i/

(

HEAT

OPTIONAL

LINE
OPTIONAL
ELECTRIC HEAT
FIELDqNSTALLED)

SUCTION
LINE

(RIGHT SIDE)
LINE VOLTAGE
LOW VOLTAGE
(LEFT SIDE)

LIQUID
LINE

-,,.ILC:_"_b TERAccESSRET0:N--'_'I
L
5/6 (16)

5/6 (16)
FRONT VIEW

CBX32MV

1 (25)

SIDE VIEW

11-1/16

5/6 (16)

SIDE VIEW

UPFLOW POSITION

DOWNFLOW

Model Dimensions
-018/024

5/8 (16)

(Upflow,
-024/030

Downflow,

Left- and Right-Hand
-036

POSITION

Horizontal

-048 and -060

applications)
-068

Dim.
in. (ram)

in. (ram)

45-1/4 (1149)

49-1/4 (1251)

51 (1295)

58-1/2 (1486)

64 (1626)

16-1/4 (413)

21-1/4 (540)

20-5/8 (524)

22-5/8 (575)

24-5/8 (625)

26-5/8 (676)

14-3/4 (375)

19-3/4 (502)

19 (483)

21 (533)

23 (584)

25 (635)

15 (381)

20 (508)

24-5/8 (625)

26-3/8 (670)

27-7/8 (708)

31-3/8 (797)

20-5/8 (524)

24-5/8 (625)

30-5/8 (778)

32-5/8 (829)

Page 2
505343

05/08

PFL

5-3/8

FILTER
LIQUID

Horizontal Position
(Right-Hand
Air
Discharge)

CONDENSATE
DRAINS (2)
(UPFLOW AND
DOWNFLOW

CONDENSATE
DRAINS
(HORIZONTAL)

FOR DIMENSIONS "A" THROUGH
"H", SEE CHART ON PAGE 2.

LIQUID
LINE
PIPING PLATE
DETAIL

OPTIONAL

SUCTION
LINE

TOP VIEW

ELECTRIC

HEAT (FIELDqNSTALLED)

1-1/2
(38)

5/8(15)

/4 (19)

LINE VOLTAGE
INLETS
AND RIGHT
SIDE)

G -_5_/8(16)

5/8(15)

........

3/4 (19)

B
LOW VOLTAGE
INLETS
AND RIGHT
SIDE)
5/8 (16)

_--_ 3/4 (19)

END VIEW

END VIEW
FILTER ACCESS

FRONT VIEW

Horizontal Position
(Left-Hand Air
Discharge)

4-3/8
(111)

1-1/8
(29)

OPTIONAL ELECTRIC
HEAT (FIELD INSTALLED)

FILTER

LOW VOLTAGE

SUCTION
LINE

TOP VIEW

PIPING PLATE
DETAIL

INLETS (TOP AND

3/4 (19)
11-1/16

LEFT SIDE)

5/8 (16)

SUCTION

LIQUID
LINE

LINE,

LIQUID
LINE

P'I
_'_
_1

5/8(15)

3/4 (19) =

FILTER ACCESS

5/8(15)

1 (25)
1-1/2 (38)

3/4 (19) L
LINE VOLTAGE
(BOTTOM

INLETS

AND LEFT SIDE)

END VIEW

CONDENSATE

5/8(15)

DRAINS

(HORIZONTAL)

END VIEW

FRONT VIEW

The Dave Lennox Signature TM Collection 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

UPFLOW APPLICATION
Use the following procedures to configure the unit for
upfiow operations:

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

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,

WARNING

II
II

UPFLOW/
DRAIN PAN
DOWNFLOW

To disassemble:
1, Remove access panels,
2, Remove both blower and coil assemblies.
lighten the cabinet for lifting.

This will

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,

05/08

Table 1. Optional Unit Side Stand (Upflow Only)
Models

Kit Numbers

-018/024

45K31

-024/030,-036,
-068

-048, -060 and

HORIZONTAL RIGHT-HAND
APPLICATION

45K32

DISCHARGE

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
505343

Figure 1. Upflow Configuration

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:

HORIZONTAL
DRAIN PAN
II..,-,-'(MUS T BE REMOVED)

UP-LOAD / DOWNFLOW
DRAIN PAN

HORIZONTAL DRIP SHIELD
MODELS)

HORIZONTAL LEFT-HAND DISCHARGE
APPLICATION
Use the following procedures to configure the unit for
horizontal left-hand discharge operations:

(-068

NOTE - For horizontal applications, a secondary drain pan
is recommended. Refer to local codes.

HORIZONTAL
PAN

DRAIN

DOWNFLOW

NO ADJUSTMENTIS

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.)

RAIL

NECESSARY

1. Pull the coil assembly from unit. Pull off the horizontal
drain pan.

Figure 2. Right-Hand Discharge Configuration

2. Remove the drain plugs from back drain holes on
horizontal drain pan and reinstall them on front holes.

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.

A IMPORTANT

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.

3. Rotate drain pan 180° front-to-back and install it on the
opposite side of the coil.

To remove rail:
1. Remove the screws from the rail at the back of unit and
at the cabinet support rail.

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.

2. Remove the downfiow rail then replace screws.

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.

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
ELECTRICAL

ANGLE IRON OR
.SHEET METAL

CLEARANCE

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.

INLET

4 IN. (102 MM)

FRONT VIEW
Figure

3. Suspending

END VIEW

Horizontal

A IMPORTANT

Unit

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,

CABINET

DRIP
SHIELD \
_
\

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.

TOP CAP SCREWS

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.

• 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.

DRAIN PAN
SHIPPING
LOCATION

t
DRAIN PLUGS
REMOVED

COIL SHOWN IN UPLOAD

1. Remove the coil assembly from the unit,

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:

HERE

POSITION

5. From the underside of the coil, install the downflow drip
shield firmly in place as illustrated in figure 8,
FROM HERE

Table 2. Downflow

IN COIL END
PLATE.
TOP
CAP _

Drip Shields

(Tape Required)

FOR EASY CONVERSION
ALIGN HOLES

WITH HOLES
BACK COIL
END SEAL

90 °
BEND

APPLICATION

Use the following procedures to configure the unit for
downflow operations:

TOP CAP ROTATED TO
CORRECT POSITION

DRAIN PAN
REINSTALLED
HERE

REINSTALLED

DOWNFLOW

Units

Part
Numbers

Length

Width

-018/024

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

Figure 4. Field Modification for Left-Hand Discharge
HORIZONTAL

(REMOVE

DRAIN PAN
FROM UNIT)

DRIP SHIELD (_068 MODEL)

UP-LOAD

/ "_"

DOWNFLOW

Y'- ool I
DOWNFLOW

RAIL

DRAIN PAN

FRONT EDGE OF HORIZONTAL
DRAIN PAN

Figure 5. Left-Hand Discharge Configuration

Figure 6. Downflow Discharge Position

Page 6
505343

05/08

HANDER

DRIP SHIELD

COMBUSTIBLE
FLOOR
ADDITIVE
BASE

2" WIDE FOAM TAPE
SIDE
VIEW

1" WIDE FOAM TAPE (LONGER

Figure 9. Combustible

PIECE)
,

Figure

7. Applying

Foam

Tape to Drip Shield
g,

COIL

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,

DRIP PAN
1-5/8 (41)

Figure 8. Downflow

TOP VIEW

Drip Shields
1-5/8 (41) 4

6. Replace the coil assembly and blower if you have
removed it. Replace the coil access panel,

@18/@24 08-1/4 (464)
@24/@30 and up 23-1/4 (591)

7, Set the unit so that it is level. Using sheet metal
screws, connect the return and supply air plenums as
required,

CAUTION

1-5/6(41)

_m._(610)

SUPPLY

AIR OPENING

-068 ON L_,ii.._

INCHES

(MM)

I -22-1/6
(662)
OTHER
MODELSI
I

13-3/8(340)

6 6(16
D"It

NOTE - For downflow application, metal or class I supply
and return air plenums must be used.

Figure 10. Downflow Combustible

Base Dimensions

Page 7
CBX32MV

SERIES

NOTE: Be aware of filter access panel when connecting
lines, Filter must be accessible,

WARNÁNG

NOTE: See outdoor unit instructions
nitrogen through line sets.

on how to flow

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,

A IMPORTANT

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.

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

AIR HANDLER

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
Models

Liquid
Line

Vapor/
Suction
Line

L10 Line
Sets

L15 Line
Sets

-018/024

3/8 (10)

5/8 (16)

L10-26
20 - 50 ft.

L15-26
20 - 50 ft,

(6- 15m)

-024/030
and -036

3/8 (10)

3/4 (19)

L10-41
20 - 50 ft,
(6- 15m)

L15-41
20 - 50 ft,
(6- 15m)

-048

3/8 (10)

7/8 (22)

L10-65
30 - 50 ft,
(9- 15m)

L15-65
30 - 50 ft.
(9- 15m)

-060 and
-068

3/8 (10)

1-1/8 (29)

Field
Fabricated

UNIT

LINE

LIQUID

LINE

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.

Before connecting drain line(s), check
verify that drain opening is fully open
debris. Also check to make sure that no
into the drain pan during installation that
drain opening,

Page 8
505343

05/08

drain hole(s) to
and free of any
debris has fallen
may plug up the

Connect
maincondensate
drainandroutedownward
toan
opendrainorsump.Donotconnect
draintoa closedwaste
system.See figure 12 for typical condensatetrap
configuration.
VENT MUST EXTEND

ABOVE

DRAIN PAN BY 2 INCHES

THE HEIGHT

OF THE COIL"

(51 MM).

VENT

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.

DRAIN PAN
TRAP MUST BE DEEP ENOUGH TO OFFSET
MAXIMUM
2 INCHES

STATIC DIFFERENCE
[51MM]).

(GENERAL
TRAP (49P66)

DRAIN LINE SHOULD
10 FEET

SLOPE

A IMPORTANT

A MINIMUM

Filters should be inspected monthly and must be cleaned
or replaced when dirty to assure proper furnace operation.

1 INCH PER

(25 MM PER 3 M)

TO APPROVED

Figure 12. Typical Condensate

DRAIN

Units are equipped with standard throw-away type filters
which should be replaced when dirty.

Drain

To replace filter:
1. Loosen the thumbscrews
place.

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.

holding the filter panel in

2. Slide the filter out of the guides on either side of
cabinet.
3. Insert new filter.
4. Replace panel.

LEFT-HAND
DISCHARGE

UPFLOW OR
DOWNFLOW

RIGHT-HAND
DISCHARGE

See table 4 for replacement filter sizes.
Table 4. Filter Dimensions
Unit Model No.

oo ]
AUXILIARY

DRAIN

ON LEFT

MAIN DRAIN

ON RIGHT

Figure 13. Auxiliary and Main Drain Locations
The following practices
condensate removal:
•

are recommended

to ensure

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.

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.
©

O
JP1 15PIN
PLUG (BOARD
TO MOTOR)

JPL
o

Table 5. Recommended
o

CBX32MV
Air Handler

LENNOX

(DRIVES OPTIONAL
ACCESSORY
RELAY)

HEATING AND
COOLINGMODES)

_lV
,

+
_
TEST ,_Jl

ADJUST
O

3
2

HEATING SPEED
/
SELECTOR
PINS
COOLING SPEED
SELECTOR PINS

Note 2.

Note 3.

Note 4.

4318/024, -024/030 and
-036

COOL
PIN #3

COO L
PIN #3

HEAT
PIN #4

H EAT
PIN #4

-048

COOL
PIN #2

HEAT
PIN #1

-060

COOL
PIN #3

HEAT
PIN #1

-068

COOL
PIN #3

HEAT
PiN #4

HEAT
PIN #4

1. Condensing Unit
2. Heat Pump
3. Condensing Unit with electric heat only

/DIAGNOSTIC
FAN DELAY
LEDS
SELECTOR PINS

4. Heat Pump with electric heat
* Minimum setting for heat

Board

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.

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

To change jumper positions, gently pull the jumper off the
pins and insert it onto the desired set d pins. 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.

Page 10
505343

05/08

Heating*

Note 1.

COOL

Figure 14. BDC3 Variable Speed Control
Selections

Diagnostic

Cooling

NOTES -

HEAT
!HE,_

Blower Speed Taps

Speed Tap Selection

ACCESSORY
RELAY CONTACT_

OPERATIONAL
SELECTOR PINS
(AFFECTS BOTH

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.

Applications without the Lennox SignatureStat'"
thermostatwill provide70%of the COOLCFMduring
first-stagecoolingfor two-stageoutdoorunits.100%of
COOLspeedis providedforsystemswitha single-stage
outdoorunits.
Applications
with the LennoxSignatureStat
thermostat
but no demandfor de-humidification
will operateas
follows:duringa first-stage
coolingcall(two-stage
outdoor
unit),theairvolumeis70%oftheCOOLjumperselection.
Fora normalCOOL(Pin#2 settingfor CBX32MV-036),
theCFMis 1125;thereducedspeedis 788CFM(1125x
70%= 788).This arrangement
providesfor additional
dehumidification
duringstandardfirst-stagecooling.See
tables11and12forvariousscenariosconcerning
useof
the SignatureStat
thermostatandthe CBX32MVseries
unit.
Table 6. CBX32MV-018/024

For applications
with HarmonyII(_)zonecontrol,the air
handlerCFMvolumeis determined
by the HarmonyII
control center. The minimum Blower speed is
predetermined
at300CFMfor-024/030
units,650CFMfor
-036seriesunits,and850CFMfor -048,-060and-068
seriesunits.Thisspeedis notadjustable.
Seefootnotes
in
tables8 and9 onpage12.
Withthethermostat
setfor Continuous 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.

Air Handler Performance (0 through 0.80 in. w.g. [0 -- 200 Pa]
External Static Pressure Range)
BDC3 Jumper Speed Position

ADJUST
Jumper
Se_ing
+

NORM

1
cfm
715
670
580

L/s
337
316
273

cfm
855
770
700

HEAT Speed
2
3
L/s
cfm
L/s
403
1000
472
363
900
424
330
800
377

4
cfm
1130
1035
930

L/s
533
488
438

cfm
465
425
385

L/s
219
200
181

cfm
690
820
560

COOL Speed*
2
3
L/s
cfm
L/s
325
900
424
292
825
389
264
735
346

4
cfm
1050
950
850

L/s
495
448
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.

Table 7. CBX32MV-024/030

Air Handler Performance (0 through
External Static Pressure Range)

0.80 in. w.g. [0 -- 200 Pa]

BDC3 Jumper Speed Positions
ADJUST
Jumper
Setting
+

NORM

1
cfm
800
725
655

Us
380
340
310

cfm
935
850
765

HEAT Speed
2
3
Us
cfm
Us
440
1070
505
400
975
460
360
880
415

4
cfm
1210
1100
990

Us
570
520
470

cfm
660
600
540

Us
310
285
255

cfm
880
800
720

COOL Speed*
2
3
Us
cfm
Us
415
1100
520
380
1000
470
340
900
425

4
cfm
1320
1200
1080

Us
625
565
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)
ADJUST
Jumper
Setting
+
NORM
-*First-stage

1
cfm
1230
1120
1010

L/s
580
530
475

BDC3 Jumper Speed Positions
HEAT Speed
COOL Speed*
2
3
4
1
2
3
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
cfm
L/s
1335 630 1445 680 1545 730 1090 515 1225 580 1380 650
1215 575 1315 620 1400 660
975
460 1125 530 1275 600
1200 565 1185 560 1265 595
900
425 1000 470 1135 535

(two-stage units only) cooling is approximately

Continuous fan speed is approximately

4
cfm
1545
1400
1265

L/s
730
660
595

CBX32MV

SERIES

70% of the COOL speed rating.

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

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

cfm

L/s

HEAT Speed
2
3
cfm
L/s
cfm
L/s

1850
1705
1560

875
805
735

1960
1800
1625

NORM

925
850
765

2090
1900
1720

985
895
810

cfm

L/s

cfm

L/s

COOL
2
cfm
L/s

2150
2005
1770

1015
945
835

1625
1425
1205

765
670
570

1820
1625
1375

860
765
650

Speed*
3

cfm

L/s

cfm

L/s

2055
1805
1555

970
850
735

2145
2005
1725

1010
945
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.

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
ADJUST
Jumper
Setting

1
cfm
1875
1760
1550

NORM
*First-stage

L/s
885
830
730

cfm
1975
1825
1650

HEAT Speed
2
3
L/s
cfm
L/s
930
2090
985
860
1920
905
775
1725
815

(two-stage units only) cooling is approximately

4
cfm
2150
2030
1800

1
L/s
1015
955
850

cfm
1640
1465
1250

L/s
775
690
590

cfm
1840
1625
1390

COOL Speed*
2
3
L/s
cfm
L/s
870
2075
980
765
1800
850
655
1560
735

4
cfm
2150
2000
1720

L/s
1010
945
810

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
System
Condition

Thermostat Demand
Step

I
Y1 Y210
I

I
IG

Relative Humidity

Compressor

Air
Handler
CFM

Status

Acceptable

24 VAC

High

100%

Comments

(COOL)

NO CALL FOR DEHUMIDIFICATION
Normal
Operation

Compressor and indoor
air handler follow thermostat demand

BASIC MODE (only active on a Y1 thermostat demand)
Normal
Operation

Acceptable

24 VAC

High

100%

Dehumidification
Call

Demand

0 VAC

High

60%/65
70%*

SignatureStat " energizes Y1 and de-energlzes D on a call for dehumidification

PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal
Operation

Acceptable

24VAC

High

100%

Dehumidification
call

Demand

0VAC

High

60%/65%
70%*

Dehumidification
call ONLY

Demand

0VAC

High

60%/65%
70%*

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

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 setting in precision mode.

Page 12
505343

05/08

Table 12. CBX32MV SignatureStat'"
Operating Sequence

Thermostat and Two-Stage Outdoor Unit Operating Sequence

System Demand
Thermostat Demand

System

•

Air
Handler

Relative Humidity

Condition
Step Y1 Y2 O
NO CALL FOR DEHUMIDIFICATION
Normal Operation Y1

Normal Operation Y2

System

W1 IW2

Com-

CFM

Status

pressor

(COOL)

Acceptable

24 VAC

Low

70%

Acceptable

24VAC

High

100%

Comments

Compressor and indoor
air handler follow thermostat demand

Room Thermostat Calls for First-Stage Cooling
BASIC MODE (only active on a Y1 thermostat demand)
NormaIOperation

Dehumidification
Call

Acceptable

24VAC

Low

70%

Demand

24VAC

High

60%/65%
70%*

Low

70%

High

60%/65%
70%*

PRECISION MODE (operates independent
NormaIOperation

Dehumidification
call

Dehumidification
call ONLY

Room
BASIC

MODE

(only active

of a Y1 thermostat demand)

Acceptable

24VAC

Demand

Thermostat

Signatures[at energizes
Y2 and de-energizes D
on a call for dehumidification

0VAC

Demand

Calls for First-

on a Y1 thermostat

0VAC

High

and Second-Stage

60%/65%
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**

Cooling

demand)

NormaIOperation

Acceptable

24VAC

High

100%

Dehumidification
Call

Demand

0VAC

High

60%/65%
70%*

High

100%

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**

PRECISION MODE (operates independent
Normal Operation

of a Y1 thermostat demand)
Acceptable

24VAC

Dehumidification
call

Demand

0VAC

High

60%/65%
70%*

Dehumidification
call ONLY

Demand

0VAC

High

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
* During

dehumidification,

cooling

air handler

speed is as follows:

** In precision mode, SignatureStat'
thermostats
October 2003 will maintain the room temperature

Signatures[at energizes
Y2 and de-energizes D
on a call for dehumidification

70 oYoof COOL cfm for 018/024,

024/030,

mode

65 oYofor 036, 60 oYofor 048 and 060 units.

built BEFORE October 2003 will maintain the room temperature up to 3°F (1.8°C)
up to 2°F (f.2°C) cooler than the room thermostat setting in precision mode.

HEAT JUMPER

Dehumidification

cooler than room thermostat

setting.

Thermostats

built AFTER

#1 Pins Jumpered -A Motor runs at 100% until demand is satisfied.

The HEAT jumper is used to determine CFM during
electric heat operation only. These jumper selections are
activated only when W1 is energized.

B
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.

Once demand

is met, motor ramps down to stop.

#2 Pins Jumpered -A Motor runs at 100% until demand is satisfied.
A

Page13
CBX32MV

SERIES

Once demand is met, motor runs at 100% for 45
seconds. Then,

ramps down to stop.

NOTE - Air HandlerOFF
heat pump operation

DELAY also applies during

#3 Pins Jumpered -A

WARNING

Motor runs at 82% for approximately
7-1/2
minutes. If demand has not been satisfied after
7-1/2 minutes,
motor runs at 100% until demand is satisfied,
B/

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.

Once demand is met, motor ram )s down to stop,

#4 Pins Jumpered -A
B

C
D

Motor runs at 50% for 30 seconds,
Motor then runs at 82% for approximately 7-1/2
minutes. If demand has not been satisfied after
7-1/2 minutes,
Motor runs at 100% until demand is satisfied,
Once demand is met, motor runs at 50% for 30
seconds, Then,
B

A_j
E

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.

ramps down to stop,

SIGNATURESTAT
OUTDOORf'_
SENSOR

[]
[]
AN

THERMOSTAT

_"_"_'_'_'_'___J_l

[]

.......

OUTDOORf_

M 27 O R 81 M27

I
I
I
I
I
I
!
I
I
I

I
I
I
I

'
I
I
I
I
I
I
I

D=:L

i
,

1
I

....

OUTDOOR
SENSOR_
IF USED,
REQUIRES
SEPARATE
CABLE
FROM T'STAT
TWISTED
PAIR,
22AWG
MINIMUM, 300 FT MAX,
(LNX. CAT, #84X49)

[]

/
I

'I
I

(with

FIELD
Y1
R _'-

ONE

100604M3

WIRING

STAGE

Cooling

Page 14
505343

05/08

1 100604M4
AC

Figure 15. Field Wiring:

--i--4--- _J
I I
I I
j I
I
J

-I

FACTORY
WIRZNG

I
I
I
I
I
I

L-....
I
J
v-

i__j

]

I
I
I
I
I
I
J

I
I
I
J

[]
[]

.......

SENSOR

TWO

Application

STAGE

Electric

Heat)

FIELD
WIRING
FOR
UNITS
WITHOUT CIRCUIT
BREAKERS

FIELD WIRING FOR
UNITS WITH CIRCUIT BREAKERS
CIRCUIT

2z_Tr_B

/,XL3_

OROUNO

/_k

CONNECT POWER WIRES FRSM HEATER LABELED LI,L2
"P" VOLTAGE UNITS AND LI.L2,L3 ON "Y" VOLTAGE
UNITS TO TS2 TERMINAL STRIP IN INDOOR UNIT
EOUIPUENT

GROUND

LOCATED

IN INDOOR

CIRCUIT

A cBzA

L2
z_L3_II""_

/_ _'/k

L'_
Z_L3111.1

_--

--Z_L3_II'B

EQUIPMENT

//k

€

_,,co3/k

_ Z_FL- _

CIRCUIT

i
--

OROUNO GRSUNO OR RS

II-LZ EQUIPMENT
ON

I_-E EQUIPMENT

THE NUMBER OF CIRCUITS VARY ACCORDING
TO HEATER MODEL. REFER TO FAN COIL
NAMEPLATE
FOR ACTUAL NUMBER EMPLOYED

UNIT

IS NOT

PRESENT

I_-I_ EQUIPMENT

(P) ELECTRIC

HEATERS

POWER

2€V

r
_
\
/

TOI

\-6
/
KEY
AI5
B3
CO8
FI
J2
J46
J48
J49
K20.-E.2
P46
P48
P49
TI
TBI

DESCRIPTION
COMPONENT
CONTROL-BLOWER
DRIVE
MOTOR-BLOWER
CIRCUIT
BREAKER
FUSE-TRANSFORMER
JACK-ELECT.
HEAT
JACK-OUTPUT
JACK-MOTOR.VAR
SPD
JACK-MOTOR.VAR
SPD
RELAY-BLOWER
PLUG-OUTPUT
PLUG-MOTOR.VAR
SPO
PLUG-MOTOR.VAR
SPD
TRAN£FORMER-CONTRnl
TERM
STRIP-CLASS
II

BLOWER
I

-A_X

HEAT

COOL/HEAT
REFER
CHART

Y2
0

TO FACTORY
BELOW
FOR

BLOWER
SLOWER

SPEED
SPEED

TAP SELECTION
INFORMATION

ONLY.
REFER
TO UNIT
CIRCUIT
AMPACITY
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"

Ll
Z

USE COPPER
CONDUCTORS
NAMEPLATE
FOR MINIMUM
AND MAXIMUM
OVERCURRENT

EOUIP
GROUND

I Z_

ECON
G

HEAT

REV VALVE

-3

CIRCUIT
K20

-A-UX

COOL/HEAT

_J48

JUMPER "R"
TO "0"
UNIT.
REMOVE "R"
PUMP
IS USED.

> >__LACK
A

-2

L2=
L£-k

IS USED WITH
TO "0"
JUMPER

REMOVE
JUMPER
BETWEEN
"OS"
AND
HUMIDITY
CONTROL
{CCO,-AZO)IS
JUMPER
REMOVE

"Y,"
TO "Y2"
JUMPER "YI"

IS FOR
TO "Y2"

I
W
n-

CONDENSING
WHEN HEAT
"YI"
USED.

WHEN

SINGLE
STAGE COOLING.,
FOR TWO STAGE COOLING.

24V
COMMON

-.a----INDICATES OPTIONAL
COMPONENTS
_LINE
VOLTAGE FIELD WIRING
-- --CLASS
II VOLTAGE FIELD WIRING
RECOMMENDED

SLACK
ORANGE

BLOWER
SPEED
"COOL"

CBX52MV
BLOViER CONOEN£COIL
ING UNIT

SPEED
TAP SELECTION
TAP SELECTION
"HEAT"

NEAT
PUMP

-018/
024

COOL
PIN t3

COOL
PIN _3

-024/
0_,0
-056

COOL
PIN ,3
COOL
PIN _3

COOL
PIN =5
COOL
PIN _3

-048

COOL
PIN ,2

-060

-068
,MINIMUM

COOL
PIN .3
COOL
PIN _3
SETTING

.CONDENS]NG UNIT
WITH
ELECTRIC
HEAT ONLY

"HEAT
PUMP WITH
ELECTRIC
HEAT

HEAT
PIN ,€
HEAT
PIN .4

HEAT
PIN ,4
HEAT
PIN 14

HEAT
PIN we

HEAT
PIN 1€

COOL
PIN ,2

HEAT
PIN 'I

HEAT
PIN "I

COOL
PIN o3

HEAT
PIN tl

HEAT
PIN _1

COOL
PIN #3

HEAT
PIN _4

FOR

HEAT

Figure 16. CBX32MV Air Handler Unit Typical Wiring

Diagram

Page 15
CBX32MV

SERIES

SIGNATURESTAT '"
THERMOSTAT
51M28 OR 81M28

OUTDOOR

SENSOR

I\ I

f'5"1=- -- J

L.?_J
- -_

.L .--I-

....

-..
r'_

oa
OUTDOOR
SENSOR,
IF USED,
REQUIRES
SEPARATE
CABLE
FROM T'STAT
TWISTED
PAIR,
22AWG MINIMUM, 300 FT MAX,
(LNX, CAT, #84X49>

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FACTORY
WIRING
FIELD

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WIRING

(with Electric

Heat)

100604M1

ONE

STAGE

,IMPORTANT

TWO

STAGE

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.

WARNING

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
Page 16
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05/08

Figure 18. Repairing Insulation

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LENNOX Air Handler (indoor Blower&evap) Manual L0805356

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