LENNOX Air Handler (indoor Blower&evap) Manual L0805330

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

®
,1,_2008Lennox Industries Inc,
Dallas, Texas, USA

Dave Lennox Signature ®
Collection CB31MV Units

X_ WARNING

MULTI-POSITION
505,341M
04/08
Supersedes 07/07

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

CAUTION
CB31MV Up-flow/Down-flow

Unit Dimensions

CB31MV Horizontal LH/RH Unit Dimensions
General Information

IMPORTANT

_, IMPORTANT

....
......

...........................

4
4

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

....................
..................

Repairing or Replacing Cabinet Insulation .........
THESE

CHECK

MOTOR

SHIPPING

INSTRUCTIONS

FOR AND REMOVE

THE

Shipping and Packing List ......................

Making Electrical Connections

RETAIN

FOR FUTURE

FOLLOWING

ITEMS BEFORE

11
20

REFERENCE

OPERATING

UNIT.

BOLT

HOUSING

SUPPORT

PAD

B
HORIZONTAL DRAIN PAN (SEE UP-FLOW
APPLICATIONS
ON PAGE 4 AND
DOWN-FLOWAPPLICATIONS
ON PAGE 6 )

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

MOTOR

SHIPPING

BRACKET

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

CONFIGURATION
JUMPERS (IF NECESSARY)
(SEE
ADJUSTING
THE BDC3 BLOWER CONTROL BOARD
ON PAGE 11.

04/08

IIIlllllllllllllllllllll

Page 1

505,341M

IIIHIIIIIIIIIIIIIIIIIIIII

DIMENSION
CB31MV-041

inches (ram)

CB31MV-051,

-065 inches (ram)

51 (1295)

21-1/4 (540)

22-5/8 (502)

19-3/4 (575)

21 (533)

20 (508)

26-3/8 (670)

24-5/8 (625)

58-1/2 (1486)

21-1/4 (540)

24-5/8 (625)

19-3/4 (502)

23 (584)

20 (508)

27-7/8 (708)

30-5/8 (778)

SUPPLY AIR

3/4
(19)

OPENING

(18)
5/8
3/4
(1_

3/4

LINE VOLTAGE
INLETS
(TOP ANDLEFT
SIDE)

LOW VOLTAGE
INLETS
(TOP AND
RIGHT SIDE)

(215)
TOP VIEW

t8 8

PIPING
PLATE

-(18)

FILTER
ACCESS

FILTER

(SEE
DETAIL
BELOW
LEFT)

SUCTION
LINE

OPTIONAL
ELECTRIC
HEAT

,i-

(FIELD
INSTALLED)

/=
LIQUID
LINE

.................

PIPING
DETAILPLATE
(SEE

BELOW)
SUCT,ON
LINE

LIQUI
LIN ED..,....,.._€C

5/8

FILTER
RETURN

AIR
SUPPLY

5/8

(18)

(25)

(18)

FRONT

SIDE VIEW

VIEW

(16)

(16)
5/8

(16)
5/8
FRONT

VIEW

_SUPPLy

(RIGHT SIDE)
LOWVOLTAGE
LINE VOLTAGE
(LEFT

SIDE)

/
//
t

OPTIONAL
HEAT (FIELD

UP-FLOW

DETAIL

POSITION

OF PIPING

DOWN-FLOW

PLATE

Page 2
505341M

04/08

ELECTRIC
INSTALLED)

POSITION

A l.''_'_
tz°U

SIDE

VIEW

(1/
5/8)

DIMENSION
CB31MV-041

inches (ram)

CB31MV-051,

-065 inches (ram)

51 (1295)

21-1/4 (540)

22-5/8 (502)

19-3/4 (575)

21 (533)

20 (508)

26-3/8 (670)

24-5/8 (625)

58-1/2 (1486)

21-1/4 (540)

24-5/8 (625)

19-3/4 (502)

23 (584)

20 (508)

27-7/8 (708)

30-5/8 (778)

LIQUID
LINE

CONDENSATE
DRAINS (2)

FILTER

I!! i
I! i i

I!::!::::::::::::
J

\
\

LIQUID

LINE
DETAIL OF PIPING PLATE
5/8(16)

5/8(15)

SUCTION

/
OPTIONAL ELECTRIC
HEAT

LINE

TOP VIEW

(FIELD

LINE VOLTAGE INLETS
(TOP AND RIGHT SIDE)

INSTALLED)

11-1/16

3/4
(19)

1 (25)

3/4
(19)

FILTER
ACCESS

LOW VOLTAGE INLETS
(BOTTOM AND RIGHT SIDE)

5/8 (16)

END VIEW

FRONT VIEW

HORIZONTAL

POSITION

(RIGHT-HAND

END VIEW

AIR DISCHARGE)

FILTER

SUCTION
LINE
LIQUID /
LINE
OPTIONAL
(FIELD
3/4
(19)

ELECTRIC

HEAT

SUCTION

INSTALLED)

LINE jU

TOP VIEW

(19)

DETAIL OF PIPING PLATE

5/8(16)
5/8(16)

INLETS

(TOP AND LEFT SIDE)
t

LIQUID
LINE

11q/16
LOW VOLTAGE

3/4

I1_

FILTER
ACCESS

...........
1 (25)
AIR

CONDENSATE
DRAINS (2)

3/4
1-1/2
(19) -'_
LINE VOLTAGE INLETS
(BOTTOM AND LEFT SIDE)

END VIEW

1-3/4
(44)

(38)

5/8(16)

FRONT VIEW

HORIZONTAL

POSITION

(LEFT-HAND

END VIEW

AIR DISCHARGE)

Page 3
CB31MV

SERIES

A, WARNING

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

The CB31MV air handler units are designed for installation
with optional field-installed electric heat and a matched
remote outdoor unit, These units are for indoor installation
only, The units are designed for multi-positional
installations and are shipped (completely assembled) from
the factory for installation in up-flow or horizontal
right-hand air discharge applications,
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

CB31MV units are factory-configured for installation in
up-flow or horizontal right-hand air discharge applications.
The units must be field-modified for installation in either
down-flow
or horizontal
left-hand
air
discharge
applications,
DISASSEMBLE AND REASSEMBLE AIR HANDLER
UNIT
The CB31MV 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:
Step 1.

Remove access panels.

Step 2.

Remove both blower and coil assemblies. This
will lighten the cabinet for lifting,

Step 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:
Step 1.

Align cabinet sections together,

Step 2,

Reinstall screws,

Step 3,

Replace blower and coil assemblies.

Step 4. Replace access panel,
UP-FLOW AIR DISCHARGE APPLICATION

2--Drip shields (for down-flow application only)

Use the following procedures to configure the unit for
up-flow operations:
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
NFPA No. 90B - Standard for Installation of Residence
Type Warm Air Heating and Air Conditioning Systems

Step 1.

Remove access panels.

Step 2.

Remove corrugated padding from the space
between the blower and coil assemblies,

Step 3.

Discard drip shields which are shipped inside
corner post packaging. The shields are used in
down-flow applications only.

Step 4.

The horizontal drain pan must be removed when
the coil blower is installed in the up-flow position,
Removing horizontal drain pain will allow proper
airflow and increase efficiency.

Page 4
505341M

04/08

Step5. Placeunitindesiredlocation.Unitmustbelevel.
Connectreturnand supply air plenumsas
requiredusingsheetmetalscrews.
Step6. If the applicationwill not includea returnair
plenum,installtheunitona raisedstandatleast
14"fromthe floorto ensureproperair return.
Lennoxoffersanoptionalup-flowunitstandas
listedintable1.

UP-LOAD / DOWN-FLOW
DRAIN PAN

HORIZONTAL
PAN

HORIZONTAL

DRAIN

DOWN-FLOW

NO ADJUSTMENT

HORIZONTAL
Fq

I;
II
II

UP-FLOW/

1(MUST

DRAIN

PAN

BE REMOVED)

Remove the screws from the rail at the back of
unit and at the cabinet support rail.

Step 2.
Step 3.

Remove the down-flow rail then replace screws.
Seal around the exiting drain pipe, liquid line,
and suction line to prevent humid air from
infiltrating into the unit.

Table 1. Optional Unit Side Stand (Up-Flow Only)

1/2 IN. SCREWS

-41 through -65.

45K32

HORIZONTAL RIGHT-HAND
APPLICATION

MAXIMUM
ELECTRICAL

Kit Number
45K31

IS NECESSARY

Step 1.

Figure 1. Up-flow Configuration

-21,-26, and -31

RAIL

Figure 2. Right-hand Discharge Configuration
HORIZONTAL RIGHT-HAND DISCHARGE
APPLICATION IN HIGH HUMIDITY AREAS
For horizontal applications in high humidity areas remove
the down-flow rail closest to the drain pan.
To remove rail:

DRAIN PAN
DOWN-FLOW
oo_J
i

Model

DRIP SHIELD (-068
MODELS)

ANGLE IRON OR
SHEET METAL

CLEARANCE

INLET

4 IN. (102 MM)

AIR 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.
Step 1.

Figure 3. Suspending

Remove access panels and the horizontal drip
shield (-068 model) and the corrugated padding
between the blower and coil assembly. Discard
the corrugated padding and the down-flow drip
shields from the foam pads on top of the unit.

Step 2.

Install the horizontal shield on the front edge of
the horizontal drain pan as illustrated in figure 2.

Step 3.

No further adjustment is necessary. Set unit so
that it is sloped 1/4 inch towards the drain pan end
of the unit.

Step 4.

FRONT VIEW

END VIEW

Horizontal Unit

A IMPORTANT

HORIZONTAL LEFT-HAND AIR DISCHARGE
APPLICATION

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. Connect return and supply air plenums
as required using sheet metal screws.

SECURING
TAB ON
CABINET SUPPORT RAIL

DOWNFLOW
RAIL

7'_

HORIZONTAL
DRIP SHIELD

HORIZONTAL
DRAIN

PAN

Figure 4. Left-hand Air Discharge Configuration

Page 5
CB31MV

SERIES

NOTE - For horizontal applications, a secondary drain pan
is recommended. Refer to local codes.
Use the following procedures to configure the unit for
horizontal left-hand discharge operations:
Step 1,

Remove access panels. Remove corrugated
padding from space between the blower and coil
assemblies. Discard drip shields which are
shipped inside corner post packaging. The
shields are used in down-flow applications only,

Step 2,

Slide coil assembly from unit, Remove
horizontal drain pan,

Step 3,

Remove drain plugs from back drain holes on
horizontal drain pan, Reinstall plugs on front
holes,

Step 4,

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

Step 5,

Remove screws from top cap. Remove
horizontal drip shield screw located in the center
of the back coil end seal as illustrated in figure 5
on page 6,

Step 6.

Rotate horizontal drip shield 180 ° front to back.

Step 7,

Remove plastic plug from left hole on coil front
end seal and re-install plug in back hole,

Step 8,

Reinstall horizontal drip shield screw in front coil
end seal, Drip shield should drain downward into
horizontal drain pan inside coil,
DRIP
SHIELD

CABINET

TOP CAP ROTATED TO
CORRECT POSITION

\
\
\

TOP CAP SCREWS

DRAIN PAN
REINSTALLED
HERE

POSITION

NOTE - For horizontal applications in high humidity
areas, remove the down-flow rail closest to the drain pan.
To remove rail, remove screw from rail at back of unit and
at cabinet support rail. Remove down-flow rail then replace
screws. Also, seal around the exiting drain pipe, liquid and
suction tines to prevent infiltration of humid air.
Step 11, Knock out drain seal plate from access door.
Secure plate to cabinet front flange using the
provided screw,
Step 12. Flip access door and replace it on the unit,
Step 13, Set unit so that it is sloped 1/4 inch towards the
drain pan end of the unit as illustrated in figure
6. Connect return and supply air plenums as
required using sheet metal screws.
Step 14, If suspending the unit, it must be supported
along the entire length of the cabinet, tf 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 d 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,

THIS CORNER
SHOULD BE
1/4" HIGHER
THAN DRAIN
CORNER

DRAIN PLUGS -HERE
REMOVED

COIL SHOWN IN UPLOAD

Rotate top cap 180 ° front to back and align with
unused screw holes, Holes must align with front
and back coil end plates. Note that top cap has
a 45 ° bend on one side and 90 ° bend on the
other. The 90 ° bend must be on the same side
as the horizontal drain pan as illustrated in figure
figure 5,
NOTE - Use extreme care when reinstalling screws into
coil end plate engaging holes. Coil damage could result by
misatignment.
Step 10, From the up-flow position, flip cabinet 90° to the
left and set into place. Replace coil assembly.
Secure coil in place by bending down tab on
cabinet support rail as illustrated in figures 4 and
5,

DRAIN PAN
SHIPPING
LOCATION

t
-REINSTALLED

the

Step 9,

FROM HERE

FOR EASY CONVERSION

THIS CORNER
SHOULD BE
1/4" HIGHER
THAN DRAIN
CORNER

ALIGN HOLES
IN COIL END
PLATE,
TOP
CAP _

90 o
BEND

Figure 5. Field Modification (left-hand

WITH HOLES
BACK COIL
END SEAL

air discharge)

Figure 6. Sloping for Proper Drainage
DOWN-FLOW AIR DISCHARGE APPLICATIONS
Use the following procedures to configure the unit for
down-flow operations:

Page 6
505341M

04/08

CAUTION

FOR DOWN-FLOW
APPLICATIONS

COMBUSTIBLE
FLOOR
ADDITIVE BASE

The following
shields,

table

Table

lists the sizes

1. Down-flow

of the available

Drip

PROPERLY SIZED
FLOOR OPENING

drip

Shields

Unit
CB31MV-41

Part No.
LB-74272

Length
17.875

Width
4.6718

CB31MV-051,065

LB-89864

19.875

4.6718

Figure 8. Install Unit on Combustible

Step 1,

Remove the access panels. If necessary,
remove the corrugated padding from the space
between the blower and coil assemblies.
Remove the drip shields from the inside of the
cornerpost packaging,

Step 2,

Remove the coil assembly from the unit.

Step 3,

Remove the horizontal drain pan to ensure peak
operating efficiency and proper air flow in the
down-flow position as illustrated in figure 7.

Flooring

SIDE VIEW
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.

HORIZONTAL
PAN
(REMOVE DRAIN
FOR

DOWN-FLOW

ij_oOj APPLICATION)
APPLY THE LONGER PIECE OF FOAM TAPE BETWEEN
THIS PIECE OF TAPE IS 1" WIDE.

J
UP-FLOW/DOWN-FLOW
DRAIN PAN

Figure 9. Applying

COIL

THE PIECES

ON EACH END.

Foam Tape to Drip Shields

Figure 7. Down-flow Air Discharge Position
Step 4.

Rotate cabinet 180 ° from the upright position. It
may be necessary to remove the blower
assembly to lighten the cabinet for lifting.

Step 5,

Apply precut foam
illustrated in figure
seal between the
prevent water from

Step 6,

From the underside of the coil, install the
down-flow drip shield firmly in place as illustrated
in figure 10.

Step 7,

Replace the coil assembly and blower (if it was
removed), Replace the coil access panel.

Step 8,

Make sure the air handler unit is level. Connect
the return and supply air plenums as required
using sheet metal screws,

DRIP PAN
FDoRIAPMSHT/ELD
WITHOUT

tape to the drip shields as
9, The foam tape creates a
drip shield and the coil to
entering into the air stream,

COIL

DR,P
PAN
Figure 10. Down-flow Drip Shields
NOTE - For down-flow application, metal or class I supply
and return air plenums must be used.
For down-flow installation on combustible flooring,
additive base must be used as illustrated in figure 8.

Page 7
CB31MV

SERIES

Cut an opening appropriately sized for combustible base.
Base dimensions are illustrated in figure 11+
1-5/8 -Inches

(41)

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.

(mm)
1-5/8
(41)

I_.1L 11-3/8
(289)-IP'

2o (5o8)

23-1/4

AIR
PENING
IO

1-5/8
(41) --

5/8

UPPLY

(i 91)
.................................................................
TOP VIEW

(16) "1_ _'_

13-3/822-1/8
(340) (562)
_

AIR HANDLER

ILIIsioE

LIQUID

Base Dimensions

NOTE: CB31MV 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, puff a vacuum
on the line set and coil before releasing the unit charge
into the system.
NOTE: See outdoor unit instructions
nitrogen through line sets.

WARNÁNG

IMPORTANT

All CB31MV
air handlers are equipped
with a
factory-installed,
internally mounted check/expansion
valve, which is suitable for use in R410-A
applications. Use
Lennox L15 (sweat) series line sets as listed in table 2 on
page 9, or use field-fabricated refrigerant lines. L10 (flare)

on how to flow

Step 1.

Remove access panel.

Step 2+

Remove the refrigerant
refrigerant lines.

Step 3.

Use a wet rag to protect TXV sensing bulb (or
remove
it) when
brazing
suction
line
connections.

Step 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.

Step 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.

Step 6+

After the procedure is completed then remove
the wet rag.

Step 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.

Step 8+

Refer to instructions provided with outdoor unit
for leak testing, evacuating and charging
procedures.

Step 9.

Install access panel.

Page 8
04/08

LINE

Figure 12. Brazing Connections

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.

505341M

UNIT

SUC

51)

ViEW

Figure 11. Combustible

FORDOWN-FLOW
APPLICATIONS

line caps from

the

Table 2. Refrigerant Line Kits
CB31MV
Units

Vapor/
Suction

Liquid
Line

Line

3/8 in

3/4 in.

(10 ram)

(19 mm)

3/8 in

7/8 in.

(10 mm)

(22 mm)

-41

-51

•

Slope horizontal runs 1 inch per 10 feet of drain line to
offset friction.

Line Sets

•

L10-41
20 ff. - 50 ft.

L15-41
20ff.-50ff.

•

(6m-15m)

Leave an open vent in the drain line, as shown in figure
13 to overcome line length, friction and static pressure.
Construct drains in a manner which will facilitate future
cleaning. Drains must not interfere with filter access as
illustrated in figure 1 3 on page 9.

L10

L15

Line Sets

L10-65

L15-65

30 fl, - 50 ft.

30 ft, - 50 ft,

(9m-15m)

3/8 in

1-1/8 in.

Field

(10 mm)

(29 mm)

Fabricated

-65

•

Route auxiliary drain to an area where homeowner will
notice it draining. The auxiliary drain line does not
required venting or a trap. Refer to local codes.

A IMPORTANT
Connect main condensate drain and route downward to an
open drain or sump. Do not connect drain to a closed waste
system. Refer to figure 13 for typical condensate trap
configuration.
VENT MUST EXTEND ABOVE THE HEIGHT
DRAIN PAN BY 2 INCHES (51 MM).

OF THE COIL"
VENT

Filters may be duct-mounted or installed in cabinet. A filter
is factory-installed. Note that filter access door fits over
access panel. Air leakage will occur if access panel is
placed over filter door.
Filters should be inspected monthly and must be cleaned
or replaced when dirty to assure proper furnace operation.

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

STATIC DIFFERENCE
[51MM]).

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

(GENERAL

To replace filter:

TRAP (49P66)

DRAIN LINE SHOULD
10 FEET

SLOPE

A MINIMUM

1 INCH PER

(25 MM PER 3 M)

TO APPROVED

Step 1.

Loosen the thumbscrews holding the filter panel
in place.

Step 2.

Slide the filter out of the guides on either side of
cabinet.

Step 3.

Insert new filter.

Step 4.

Replace panel.

DRAIN

Figure 13. Condensate Drain Connection
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 down-flow units,
the auxiliary drain MUST be connected and routed to a
drain. See figure 14 on page 9 for main and auxiliary
drain locations.
LEFT-HAND
DISCHARGE

UP-FLOW OR
DOWN-FLOW

[
AUXILIARY

DRAIN

ON LEFT

RIGHT-HAND
DISCHARGE

CB31MV-41

20 x 22 (508

x 559)

CB31MV-51, -65

20 x 24 (508

x 610)

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.

]
MAIN DRAIN

ON RIGHT

Figure 14. Main and Auxiliary Drain Locations
The following practices
condensate removal:

See table 3 for replacement filter sizes.
Table 3. Filter Dimensions
Unit Model No.
Filter Size inches (mm)

are recommended

to ensure

•

Drain piping should not be smaller than the drain
connections at drain pan.

•

Install a trap 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.

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.

CB31MV 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

Page 9
CB31MV

SERIES

the BDC3 control board. The jumpers are labeled 1,2, 3,
and 4. Each of the numbers corresponds 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 the timing for the fan delay.

Table 4. Blower Speed Tap Selection
RECOMMENDED

SPEED TAP SELECTION

COOL
CB31MV
Air Handler

Condensing

Unit

HEAT

Heat Pump

Condensing Unit With
Electric Heat Only

Heat Pump With Electric Heat

-041

COOL PIN #3

HEAT PIN #4

-051

COOL PIN #2

HEAT PIN #1

-065

COOL PIN #3

HEAT PIN #1

Minimum setting for heat,

Figure 15 on page 10 provides an illustration of the BDC3
control board. Use tables 5 and 6 on page 12 to determine
the correct air volume for heat and cool speed taps.
ACCESSORY
OPTIONAL

RELAY CONTACTS
ACCESSORY

(DRIVES

RELAY)

The appropriate speed according to application and CFM
need is selected by moving jumper pins.

IMPORTANT

JP1 15 PIN PLUG
f

(BOARD

TO MOTOR)

O
j _

Table 4 lists the recommended factory Blower speed tap
selections for CB31MV series units. These settings are for
nominal tonnage match-ups with the CB31MV. When
matched with other sizes, it is recommended that the CFM
be adjusted to approximately 400 CFM per ton.
ADJUS

HEATING SPEED
SELECTOR
PINS

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 as illustrated in
figure 15.

COOLING
DELAY PINS
SELECTOR SPEED
PINS FAN
SELECTOR

OPERATIONAL
SELECTOR PINS (AFFECTS
BOTH HEATING AND COOLING MODES)

Figure 15. 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 15 for
identification.

After the CFM for each application has been determined,
the jumper settings must be adjusted to reflect those given
in tables 5 and 6. 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 JUMPERS

DIAGNOSTIC

LEDS

Step 1.

RUN LED indicates there is a demand for the
Blower motor to run,

Step 2.

CFM LED indicates the CFM 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 fiash,

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.

The ADJUST pins allow the motor to run at normal speed,
approximately 10% higher, or approximately 10% lower than
normal speed, Table 5 gives 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, chose the
remainder 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.

Page 10
505341M

04/08

COOLJUMPERS
TheCOOLjumperis usedtodeterminetheCFMduring
either1)coolingor2)heatpumpoperation
withouta callfor
electricheat.Thesejumperselectionsare activatedfor
coolingwhenY2 and DSterminalsin the CB31MVare
energized
andforheatingwhenY2 isenergized,
Applications
withouttheSignatureStat'"
humiditycontrol
willprovide
either70%oftheCOOLCFMduringfirst-stage
coolingfortwo-speed
outdoorunits.100%ofCOOLCFM
is providedforsystemswitha single-speed
outdoorunit,
Applicationswith the SignatureStat'"humiditycontrol
createdifferentCFMvolumes,For example,duringa
first-stagecoolingcall (two-speedoutdoorunit) with
demandfrom the SignatureStat'"thermostat,the air
volumeis40%oftheCOOLjumperselection.
Fora normal
COOL(Pin#2settingforCB31MV-41),
theCFMis 1125;
thereducedspeedis 450CFM(1125x 40%=450).This
arrangementprovidesfor additionaldehumidification
duringstandardfirststagecooling.Seetables7 and8 for
variousscenariosconcerninguseofthe SignatureStat'"
humiditycontrolandtheCB31MVseriesunit,
Forapplications
withHarmony
II(_zonecontrol,theBlower
CFMvolumeis determined
by the HarmonyII control
center.Theminimumair handlerspeedis predetermined
at650CFMfor-41seriesunitsand850CFMfor-51and
-65 series units. This speed is not adjustable,See
footnotes
intables5 and6,
Withthethermostat
setfor"Continuous
Fan"andwithouta
callforheatingor cooling,theCB31MV
willprovided50%
oftheCOOLCFMselected,
NOTE - For two-speed 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.
HEAT" JUMPERS
The HEAT jumper is used to determine CFM during
electric heat operation only, These jumper selections are
activated only when W1 is energized,
DELAY JUMPERS

B
C

NOTE - Blower OFF DELAY also applies during heat
pump operation
#3 Pins Jumpered -A

oFF___/
B

Once demand

is met, motor ramps down to stop.

#4 Pins Jumpered -A Motor runs at 50% for 30 seconds,
B

C
D

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._/

ramps down to stop.

Wiring 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 nameplate for
minimum circuit ampacity and maximum overcurrent
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,

Xk WARNING
I[,,_ [_o]_i_ii_l_o]_l_l[o]i[o]_,,_

[o]_Ik'14

This unit is provided with knockouts for conduit, Refer to
figure 16 for unit schematic wiring diagram. Refer to
figures 17, 19, 20 and 21 for typical field wiring.

Separate openings have been provided for 24V low
voltage and line voltage, Refer to the dimension illustration
of specific location,

is met, motor ramps down to stop.

WARNING

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

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,
A

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

Once demand is met, motor runs at 100% for 45
seconds, Then,
ramps down to stop.

Page 11
CB31MV

SERIES

Table

5. CB31MV-041

Air Handler

Performance

0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
BDC3 Jumper Speed Position
HEAT Speed
cfm

L/s

cfm

L/s

cfm

L/s

cfm

L/s

cfm

L/s

COOL Speed*
2
3
cfm
L/s
cfm
L/s

1230

580

1335

630

1445

680

1545

730

1090

515

1225

1120

530

1215

575

1315

620

1400

660

975

460

1010

475

1200

565

1185

560

1265

595

900

425

ADJUST
Jumper
Setting
+

NORM

First-stage (two-stage units only) cooling is approximately

4
cfm

L/s

580

1380

650

1545

730

1125

530

1275

600

1400

660

1000

470

1135

535

1265

595

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 380 cfm (180 L/s).
NOTE - The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.

Table

6. CB31MV-051,

-065 Air Handler

Performance

0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
BDC3 Jumper Speed Position
HEAT Speed
cfm

L/s

cfm

L/s

cfm

L/s

cfm

L/s

cfm

L/s

COOL Speed*
2
3
cfm
L/s
cfm
L/s

1850

875

1960

925

2090

985

2150

1015

1625

765

1820

860

2055

970

2145

1010

NORM

1705

805

1800

850

1900

895

2005

945

1425

670

1625

765

1805

850

2005

945

1560

735

1625

765

1720

810

1770

835

1205

570

1375

650

1555

735

1725

815

ADJUST
Jumper
Setting

First-stage (two-stage units only) cooling is approximately

4
cfm

L/s

70% of the COOL speed rating,

Continuous fan speed is approximately 50% of COOL speed rating.
Lennox Harmony II E 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 7. CB31MV SignatureStat'"

Operating
Sequence

system

I Thermostat
System
Condition
Step
Y1
O
NO CALL FOR DEHUMIDIFICATION
Normal
Operation

Demand

Demand
G

Relative

and Single Stage Outdoor Unit

Humidity

Status

Acceptable

24
VAC

System
Air

Resp°nse

HandlerCFM
Compressor

High

(COOL)

100%

Comments

Compressor and indoor air
handler follow thermostat demand

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

Acceptable

Call

On
PRECISION

Normal
Operation
Dehumidification

High

100%

call

Demand
VAC
High
60%/65%*
MODE (operates independent of a Y! thermostat demand)
24
Acceptable
VAC
High
100%
O
Demand

VAC

High

60%/65%*

High

60%/65%*

Dehumidification
call ONLY

24
VAC

Dehumidification

Demand

VAC

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

Dehumidification mode begins
when humidity is greater than
set point
SignatureSr[at " will try to
maintain room humidity setpoint by allowing the room
space to maintain a cooler
room thermostat setpoint**

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
Lennox SignatureStat _' used for these applications are 51 M26 - 1 heat / 1 cool or 51 M28 - 2 heat / 2 cool heat pump
* During dehumidification, cooling air handler speed is as follows: 65% of COOL cfm for -41units, 60% COOL cfm for -51 and -61 units
** In Precision mode, SignatureStat _ thermostat built BEFORE October 2003 will maintain room temperature up to 3°F (1.8°C) cooler than room
thermostat setting. Precision thermostat built AFTER October 2003 will maintain room temperature up to 2°F (1.2°C) cooler than the room thermostat setting.

Page 12
505341M

04/08

Table 8. CB31MV, SignatureStat"

Thermostat Demand
System
Condition

Step

and Two-Stage Outdoor Unit

Air Handler
CFM

Relative Humidity
W2

Status

Compressor

Acceptable

24 VAC

Low

Acceptable

24 VAC

High

(COOL)

Comments

NO CALL FOR DEHUMIDIFICATION
Normal
Operation - Y1

Normal
Operation - Y2

ROOM

THERMOSTAT

CALLS

On
FOR

FIRST

STAGE

70%

100%

Compressor and indoor air handler follow thermostat demand

COOLING

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

Dehumidificatio
n Call

Acceptable

24 VAC

Low

Demand

24 VAC

High

70%

60%/65%*

SignatureStat energizes Y2 and de-energizes D on a call
for dehumidification

PRECISION MODE "operates independent of a Y1 thermostat demand)
Normal
Operation
Dehumidificatio
n call

Dehumidificatio
n call ONLY

Acceptable

Demand

24 VAC

0 VAC

Low

70%

High

60%/65%*

High

60%/65%*

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

ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
BASIC MODE (only active on a Y1 thermostat demand)
Normal
Operation

Acceptable

24 VAC

High

Dehumidificatio
n Call

Demand

0 VAC

High

100%

60%/65%*

SignatureStat energizes Y2 and de-energizes D on a call
for dehumidification

PRECISION MODE 'operates independent of a Y! thermostat demand)
Normal
Operation

Acceptable

24 VAC

High

100%

Dehumidificatio
n call

Demand

0 VAC

High

60%/65%*

Dehumidificatio
n call ONLY

Demand

0 VAC

High

60%/65%*

Jumpers at indoor unit with a two stage outdoor unit
With Condensing unit - R to O
With Heat Pump - none
Lennox SignatureStat"

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

used for these applications are 51 M27 - 2 heat / 2 cool or 51 M28 - 2 heat / 2 cool heat pump.

During dehumidification,

In Precision mode, SignatureStat _' thermostat built BEFORE October 2003 will maintain the room temperature up to 3°F (1.8°C) cooler than room
thermostat setting. Precision thermostat built AFTER October 2003 will maintain the room temperature up to 2°F (1.2°C) cooler than the room thermostat setting.

cooling air handler speed is as follows: 65% of COOL cfm for -41 units, 60% COOL cfm for -51 and -61 units

Page13
CB31MV

SERIES

I
--

LINE
VOLTAGE
FIELD
WIRING
CLASS ]I
VOLTAGE
FIELD
WIRING

A
LLI

REFER
CHART

TO FACTORY
BELOW
FOR

BLOWER
GLOWER

FIELD

WIRING

WITHOUT

SPEED
TAP SELECTION
SPEED
INFORMATION

FOR

CIRCUIT

UNITS

FIELD WIRING FOR
UNITS WITH CIRCUIT

BREAKERS

CIRCUIT
A
Z_

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" & "WB"

/X
A_

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

REMOVE JUMPER BETWEEN
"DO"
AND "YI" WHEN
HUMIDITY
CONTROL
(SIGNATURESTA_
IS USED,

A
Lg&

JUMPER "YI"
TO "YB"
IS
FOR SINGLE
STAGE COOLING,
REMOVE JUMPER "YI _ TO _Y2"
FOR TWO STAGE COOLING.

A
LL&

CO8 USED ON
ONLY

EOUIPMENT IN GROUND
LOCATED
INDOORUNIT

LB
(P)

AND 65

CIRCUITLI _

A
A

EOUIPMENT
GROUND

CR3

A
A

L3 _

CIRCUIT

CB2
A_A

L3 "_

A_ CBI
L3"II""

EOOIPMENT
EOOIRMENT
GRGUNO
GROUND

CONDENSING
WHEN
HEAT

BREAKERS

CIRCUIT

GROUND

EQUIPMENT

J2
R

2AV

POWER

-Z
\
/

UNITS

DESCRIPTION
KEY
COMPONENT
AI5
iCONTROL=BLOWER
DRIVE
B3
AOTOR_BLOWER
CB8
iCIRCUIT
BREAKER-TRANS
Fi
iFUSE-TRANSFORMER
J2
iJACK-ELECT.
NEAT
J4G
iJACH-OUTPUT
J48
iJACK=MOTOR.VAR
SPD
J49
iJACK-MGTOR.VAR
SPR
K20.-IUiRELAY-BLOWER
PAR
iPLUG-OUTPUT

ISELECTRIC
NOT PRESENT
ON
HEATERS

THE NUM6ER OF CIRCUITS
VARY
ACCORDING
TO HEATER MODEL,
REFER
TO FAN COIL NAMEPLATE
FOR ACTUAL NUMBER EMPLOYED

CONNECT
POWER WIRES
HEATER
LABELED
LI,L2 FROM
ON
"P*
VOLTAGE
UNITS
ANO
LI,LG,L5
ON "Y" VOLTAGE
UNITS
TO TB2 TERMINAL
STRIP
IN INDOOR
UNIT,

-8

PAR
PA9
T_
TRI

iP_UG-MDTQR,VAR
5P#
iPIUG-MGTGR.VAR
RPR
iTRANSFDRWPR-CGNTRDJ
iTFRM STRIPED
ASS II

CIRCUIT
K20

I
z_

BLACK

L_>

ORANGE
RECOMMENENED

BLOWER
SPEED

SPEED
TAP
SELECTION
TAP SELECTION

"COOL"
CBBIMV
BLOWER
COIL

"HEAT"
*CONDENSING
UNIT
WITH ELECTRIC
HEAT
ONLY

HEAT
PUMP

-41

COOL
PIN _3

COOL
PIN #3

HEAT
PIN _A

-Sl

COOL
PIN
_2

COOL
PIN _G

HEAT
PIN #1

HEAT
PIN _I

_65

COOL
PIN 13

COOL
PIN #3

HEAT
PIN #I

Figure

BLACK
ORANGE

CONDEN5ING UNIT

*MINIMUM

HEAT PUMP WITH
ELECTRIC
HEAT

SETTING

16.

R PoD

I L4"5.4_00000o
FOR

04/08

o o _oo°

O000

HEAT

CB31MV

Blower

Coil Unit Typical Wiring

Page 14
505341M

G4V
COMMON

Diagram

R ° R

o ooo

R _°p

0 o j

L2 LI

208-250/60/I

K20 INDOOR
BLOWER RELAY
_LI

BLACK

'_'_LZ

ORANGE

REFER TO UNIT RATING
PLATE FOR MINIMUM
CIRCUIT AMPACITY
AND
MAXIMUM OVERCURRENT
PROTECTION
SIZE

CIRCUIT
FIELDSUPPLIED
WIRE NUTS

o
o
o
LU

TRANSFORMER

o
-J
0co

0
0

FUSE

o
o

u_oz
---JO

0
0
0

Al--7-_r-_

GROUND

DS+

0(_)Y _

I
L
,- -,

H
I
i--- I....

!rJ

EL_.

]]

YZ(_

l (i
I
I

ILL x--I----I-_
.-

s, A
THERMOSTAT

FF: rk!

______

"q-I-"

[

r_m ITERMINAL
A
s-l_
Fi1@_
°LI_TI_
iBLOCK /ZX

'
........

LINE VOLTAGE - FIELD-INSTALLED
CLASS 2 VOLTAGE - FIELD-INSTALLED

NEC/CEC

NOTE -ALL REMAINING WIRES FACTORY-INSTALLED
TO EXTERNAL LOAD 24VAC AT .5 AMP MAXIMUM
Z_

NEC/CEC CLASS 2, 3 VA

FACTORY INSTALLED JUMPERS. - "R" to "0" USED ONLY IN CONDENSING UNIT APPLICATIONS. REMOVE IN HEAT
PUMP APPLICATIONS. REMOVE 'DS" TO "YI" JUMPER WHEN HUMIDITY CONTROL THERMOSTAT (SIGNATURESTAT _'>IS USED. REMOVE "Y1" TO "Y2" JUMPER IN TWO-STAGE COOLING APPLICATIONS.

FACTORY INSTALLED JUMPER
NOTE - USE COPPER CONDUCTORS

ONLY

Figure

17. Cooling

Application

Page 15
CB31MV

SERIES

L2 LI

20B-2,f>O/60/I
HEAT

ELEMENT

K20 INDOOR
BLOWER RELAY

K32
HEAT

RELAY

---_---L,BLAOK
/_
CIRCUIT

REFER TO UNIT RATING
PLATE FOR MINIMUM
CIRCUIT AMPACITY
AND
MAXIMUM OVERCURRENT
PROTECTION SIZE

_---L_0RAN0_

FIELDSUPPLIED
WIRE NUTS

o
o
LU
_,.

o
0

o
(z:o

0
0

TRANSFORMER

o
0

LnOZ
--JO

o
o
o

o__A

GROUND

i]_

L.... F----F-

s,AA
THERMOSTAT

I
I
I
I
I

,- ....,

( i ; (L(
'
l_
I ! I__.U.T]
11
IL---I,--4
II
1--t
Ir

' l

I
I....

F---

!r# ....r'
B

;j-_2-_-+-,

"7--r""

i FzE
........

r_r_

ITERMINAL

LINE VOLTAGE - FIELD-INSTALLED
CLASS 2 VOLTAGE - FIELD-INSTALLED
NOTE -ALL REMAINING

NEC/CEC

WIRES FACTORY-INSTALLED

/'_

TO EXTERNAL

LOAD 24VAC AT .5 AMP MAXIMUM

/'_

NEC/CEC CLASS 2, 3 VA

FACTORY INSTALLED JUMPERS. - 'R" to "0" USED ONLY IN CONDENSING UNIT APPLICATIONS. REMOVE IN HEAT
PUMP APPLICATIONS. REMOVE "DS" TO "YI" JUMPER WHEN HUMIDITY CONTROL THERMOSTAT (SIGNATURESTAT°'° IS USED. REMOVE "YI" TO "Y2" JUMPER IN TWO-STAGE COOLING APPLICATIONS.

FACTORY INSTALLED JUMPER

//_

NOTE - USE COPPER CONDUCTORS
WHEN TWO-STAGE
JUMPER BETWEEN

ONLY

THERMOSTAT IS USED, CONNECT
TERMINALS "R" AND "W2"

THERMOSTAT HEAT ANTICIPATION

Figure

SECOND-STAGE

SETTING .4 AMP (ELECTRIC

18. Cooling

Application

Page 16
505341M

04/08

HEAT BULB TO TERMINAL 'W2," REMOVE

HEAT)

with Electric

Heat

208-230/60/I

HEAT ELEMENT

_I
K20 INDOOR
BLOWER RELAY

FIELD-SUPPLIED
WIRE NUTS

+ ??

K32
HEAT RELAY

O_)

(Orange)
CIRCUIT

0
0
0
0

d
cl::o
wn-I.gl 0

--_Jo
_: rn t_)

REFER TO UNIT RATING
PLATE FOR MINIMUM
CIRCUIT AMPACITY AND
MAXIMUM OVERCURRENT
PROTECTION SIZE

TRANSFORMER

0
0
0

FUSE

0
0
0
0
0
0

GROUND

,II

_e-:--n

° 7i
ii
,- -,

I
I

IL
i

.I1

I---I--L-I-.

--]----_

I
i
I
!

LINE VOLTA6E FIELD INSTALLED
CLASS 2 VOLTA6E FIELD INSTALLED
NEC/CEC
NOTE-ALL REMAINING WIRES FACTORY INSTALLED

, LI_

_in
11
H--_II I
I

s,AA
THERMOSTAT

I
I
I
I

[-"

It ___l__.

I. _

.¢---4-"
.....
I
I

FI--,,I1

@@E_@N%D
TERMZNAL

BLOCK

Z_TO
EXTERNAL LOAD 24VAC
AT .50AMP MAXIMUM

FACTORY INSTALLED JUMPER

z_NEC/CEC

NOTE-USE COPPERCONDUCTORSONLY

WHEN
TWOSECONDSTAGE
STAGE THERMOSTAT
IS USED,
CONI_CT
I_AT BULB
TO TERMINAL"W2," REMOVEJUMPER
BETWEEN TERMINALS"R" AND "W2"

THERMOSTAT
HEAT(ELECTRIC
ANTICIPATION
SETTIN6.4
AMP
HEAT)

CLASS 2 3VA

FACTORY
INSTALLED JUMPERS " - "R" to "0" used , only. in con.....
densmg unit apphcatlons, Remove in heat pump apphcatlons.
Remove "DS" to "YI" jumper when humidity control (SignatureStatt) is
used.
Remove "YI" to "Y2" jumper in two-stage cooling applications.

Figure

19. Cooling

Application

with Electric

Heat

Page 17
CB31MV

SERIES

Remove "R" to "0" factory-installed
in heat pump applications.

jumper

\
SI

THERMOSTAT

A
"'

-- -l.

fl'l

I fii]

I i

l i t _[!___[

II,I
III i I'---I

)
)/.......

"f,/

,>9®

1
7_-!F-m-

"q "-----I"

'-it-

I
I
I
I

I- _

r
I'
II
I1

'-I----I--

1
I

_.7-----

-- J----I.------,
L
1------

--i

7
t

i t--T--__--_

I! _--H---[

! i
"-_-'

CCB I - 1
TERMINAL

BLOCK

A
CLASS 2 VOLTAGE FIELD
INSTALLED NEC/CEC
NOTE-ALL
REMAINING WIRES FACTORY INSTALLED
L_

NEC/CEC

CLASS

2 3VA

FACTORY INSTALLED JUMPERS - 'R" to '0" used only in condensing
unit applications. Remove in heat pump applications.
Remove 'DS" to 'YI" jumper when CCB1 humidity control (A20) is used,

Remove 'YI" to 'Y2" jumper in two-stage cooling applications.
FACTORY INSTALLED JUMPER

HEAT PUMP CLASS 2
VOLTAGE TERMINALS
Figure

20. Heat Pump

Page 18
505341M

04/08

/_K

EM HT RELAY

___
_--

-iK22

Remove 'R"to'0" factoryinstalled
jumper inheat
pump applications.

r,_

('%) i

T$23
HERMOST.AT
OUTOOORz_
[I F USED)
--

I'" I r",,'i
iI I II
I

,I I

I ,'!'-I:_
......... ....
,._: __.._1--

11
1111,___
_L_-_.:-I__.
I II ............

i-I L_ -H- __T_. ............
III II I LL
....
L__D ............

Ii
L+--_,,Z--t---d

]

- ---k- /

J-

--,_

---['_-_

........

' I .__--__'t_--_--_-

--I
----i- .............
I--I --I ----jd_---T ----_l- .......

T-T-T---F,_---._J--------_------------ L-__-__T L- --i-_

..-[

I
I
I

I
I
I
I
L-F---I-------

I
I

....

,---J

I
I
I

"--J-q-_
I |

DDD_ _

_l-I]['R]r_

t--t--_ ',

THERMOSTAT
SETTING

',
TERMINAL

I,_

BLOCK

,I I I ccB-

HEAT.ANTICIPATION

.€ AMP (ELECTRIC

_
a:
C_ _

I
I

I
I
I
-

I
I
'
;

_
<_

rE !I_°

_:
_

J
_-

]

oo li

n" (j

HEAT}

FACTORY INSTALLED JUMPER

(._)

;

,,,_

_
"-'

_
LU
>"

_
__
_

L_EMERGENCY HEAT RELAY (USED ONLY IF
OUTDOOR THERMOSTAT IS USED) FIELD
PROVIDED AND INSTALLED NEAR INDOOR
UNIT 2#VAC 5VA MAX NEC CLASS 2
!_NEC/CEC

I
I
- "T-"

o_
_
DIB E']

z_WHEN
OUTDOOR
IS USED,
CONNECT
LEADS THERMOSTAT
TO TERMINALS
"R" AND "W"Z?
AND RBAOVE JUMPER BETWEEN "R" AND "W2"

i i i i _ i''

I
I
I
._7
..... I __._
, _ ._!,--,-I--, ,J , ,I
-.1-

,_ CLASS 2 VOLTAGE FIELD INSTALLED NEC/CEC
NOTE-ALL REMAINING WIRES FACTORY INSTALLED

I
I

THERMOSTAT

r,nL/'n
1.r.__-,-:--,,
IIII
.... -IT.__ __--'_..__

, ,",',,lli,
I I I i
I

S I
r_

; (_
w

_.
W

HEAT
PUMP CLASS
VOLTA6E
TERMINALS

CLASS 2 3VA

FACTORY INSTALLED JUMPERS, - "R" TO "0" USED ONLY IN CONDENSING UNIT
APPLICATIONS. REMOVE IN HEAT PUMP APPLICATIONS.
REMOVE "DS" TO "YI" JUMPER WHEN CCB1 HUMIDITY CONTROL (A20) IS USED.
REMOVE "YI" TO "Y2" JUMPER IN TWO-STAGE COOLING APPLICATIONS.

Figure 21. Heat Pump with Electric

Heat

Page19
CB31MV

SERIES

IMPORTANT

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 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.

Page 20
505341M

04/08

Figure 22. Repairing Insulation

WARNÁNG

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LENNOX Air Handler (indoor Blower&evap) Manual L0805330

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