Lennox CB29M User manual

09/05 504,719M
*2P0905* *P504719M*
Page 1
E2005 Lennox Industries Inc.
Dallas, Texas, USA
IMPORTANT
For downflow application, kit number 83M57
(LB−109844A) is required. Kit is not provided with
coil blower; order separately.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent-
ing of refrigerant (CFC’s and HCFC’s) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incar-
ceration may be levied for noncompliance.
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of
California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
INSTALLATION
INSTRUCTIONS
CB29M & CB30M
Elite®Series Units
MULTI−POSITION BLOWER COILS
504,719M
09/05
Supersedes 04/05
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Table of Contents
CB29M & CB30M Series Units 1. . . . . . . . . . . . . . . . . .
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping & Packing List 1. . . . . . . . . . . . . . . . . . . . . . . .
CB29M Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . .
CB30M Unit Dimensions 4. . . . . . . . . . . . . . . . . . . . . . .
Requirements 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Field Piping Connections 8. . . . . . . . . . . . . . . . . . . . . . .
Condensate Drain 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sealing the Unit 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Speed Adjustments 10. . . . . . . . . . . . . . . . . . . . .
Electrical 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Wiring Diagrams 17. . . . . . . . . . . . . . . . . . . . . . .
CB29M & CB30M Series Units
The Lennox CB29M and CB30M Elite®series blower coil
units are designed for installation with a matched remote
outdoor unit and optional field−installed electric heat. The
blower coil units are for indoor installation only.
The CB29M and CB30M units, designed for multi−position-
al installations, are completely assembled at the factory
and shipped ready for upflow or horizontal right−hand dis-
charge installation.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installing the unit
Check equipment for shipping damage; if found, immedi-
ately contact the last carrier.
Shipping and Packing List
Each CB29M and CB30M unit package contains:
1 − Assembled blower coil unit
Litho U.S.A.

Page 2
504719M 09/05
CB29M Upflow and Downflow Unit Dimensions − inches (mm)
OPTIONAL
ELECTRIC
HEAT
(FIELD−
INSTALLED)
AIR
FLOW
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR OPENING
RETURN AIRFILTER
LOW VOLTAGE
INLETS (TOP &
RIGHT SIDE)
RETURN AIR
Top View
Front View Side View
BLOWER
PIPING PLATE DETAIL
(For upflow and downflow positions)
A
BC
11-1/16
(281)
D
FE
LIQUID LINE
SUCTION LINE
CONDENSATE
DRAINS (2)
(HORIZONTAL)
COIL
3/4
(19)
3/4
(19)
5/8
(16)
5/8
(16)
1
(25)
5/8
(16)
1-3/4 (44)
2
(51)
1-1/8 (29) 4-3/8 (111)
2-3/4
(70)
5-3/8
(137)
3-1/2 (89)
OPTIONAL
ELECTRIC
HEAT
(FIELD−
INSTALLED)
AIR FLOW
LIQUID
LINE
SUCTION
LINE
RETURN
AIR
OPENING
SUPPLY
AIR
FILTER
SUPPLY AIR
Top View
Front ViewSide View
BLOWER
A
BC
11-1/16 (281)
F
D
E
COIL
5/8
(16)
5/8
(16)
5/8
(16)
5/8 (16)
5/8
(16)
LOW VOLTAGE
(RIGHT SIDE)
LINE VOLTAGE
(LEFT SIDE)
Downflow Position
(Kit number 83M57 (LB−909844A) required to convert
unit to downflow applications.)
1 (25)
Upflow Position
CONDENSATE
DRAINS (2)
(UPFLOW AND
DOWNFLOW)
FILTER
ACCESS
FILTER
ACCESS
LINE VOLTAGE
INLETS (TOP &
LEFT SIDE)
5/8
(16)
5/8 (16)
Model No. CB29M-21/26 & CB29M-31 CB29M-41 & CB29M-46 CB29M-51 & CB29M-65
Dimension inch mm inch mm inch mm
A45-1/4 1149 49-1/4 1251 52-1/2 1334
B16-1/4 413 21-1/4 540 21-1/4 540
C20-5/8 524 20-5/8 524 22-5/8 575
D14-3/4 375 19-3/4 502 19-3/4 502
E19 483 19 483 21 533
F15 351 20 508 20 508

Page 3
CB29M/CB30M SERIES
CB29M Horizontal Left− and Right−Hand Unit Dimensions − inches (mm)
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR
OPENING
FILTER
LOW VOLTAGE
INLETS (BOTTOM
& RIGHT SIDE)
Top View
Front View
BLOWER
B
C
D
LIQUID
LINE
SUCTION
LINE
CONDENSATE
DRAINS (2)
(UPFLOW AND
DOWNFLOW)
CONDENSATE
DRAINS (2)
(HORIZONTAL)
COIL
3/4
(19)
3/4
(19)
1-1/2
(38)
1-3/4
(44)
5-3/4
(46)
2
(51)
1-1/8
(29)
RETURN
AIR
OPENING
F
E
5/8
(16)
5/8
(16)
5/8
(16)
End View
AIR
FLOW
OPTIONAL ELECTRIC
HEAT (FIELD−INSTALLED)
11-1/16
(281)
LINE VOLTAGE
INLETS (TOP &
RIGHT SIDE)
5-3/8
(137)
4-3/8
(111)
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR
OPENING
FILTER
LOW VOLTAGE
INLETS (TOP &
LEFT SIDE)
End View
BLOWER
B
C
D
COIL
3/4
(19)
3/4
(19)
3/4
(19)
RETURN
AIR OPENING
F
E
5/8
(16)
5/8
(16)
5/8
(16)
End View
AIR
FLOW
OPTIONAL ELECTRIC
HEAT (FIELD INSTALLED)
LINE VOLTAGE INLETS
(BOTTOM & LEFT SIDE)
Horizontal Position (Right-Hand Air Discharge)
FILTER ACCESS
FILTER
ACCESS
5-3/4
(146)
1-1/2
(38)
1-3/4
(44)
CONDENSATE DRAINS (2)
(HORIZONTAL)
A
5/8
(16)
A
5/8
(16)
1
(25)
1
(25)
11-1/16
(281)
PIPING
PLATE
DETAIL
LIQUID
LINE
SUCTION
LINE
2
(51)
1-1/8
(29)
5-3/8
(137)
4-3/8
(111)
PIPING
PLATE
DETAIL
Horizontal Position (Left-Hand Air Discharge)
Top View
Front View
3/4
(19)
End View
For dimensions A"
through F", see
chart on Page 2.

Page 4
504719M 09/05
CB30M Upflow and Downflow Unit Dimensions − inches (mm)
OPTIONAL
ELECTRIC
HEAT
(FIELD−
INSTALLED)
AIR
FLOW
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR OPENING
RETURN AIRFILTER
LOW VOLTAGE
INLETS (TOP &
RIGHT SIDE)
RETURN AIR
Top View
Front View Side View
BLOWER
PIPING PLATE DETAIL
(For upflow and downflow positions)
A
BC
11-1/16
(281)
D
FE
LIQUID LINE
SUCTION LINE
CONDENSATE
DRAINS (2)
(HORIZONTAL)
COIL
3/4
(19)
3/4
(19)
5/8
(16)
5/8
(16)
1
(25)
5/8
(16)
1-3/4 (44)
2
(51)
1-1/8 (29) 4-3/8 (111)
2-3/4
(70)
5-3/8
(137)
3-1/2 (89)
OPTIONAL
ELECTRIC
HEAT
(FIELD−
INSTALLED)
AIR FLOW
LIQUID
LINE
SUCTION
LINE
RETURN
AIR
OPENING
SUPPLY
AIR
FILTER
SUPPLY AIR
Top View
Front ViewSide View
BLOWER
A
BC
11-1/16 (281)
F
D
E
COIL
5/8
(16)
5/8
(16)
5/8
(16)
5/8 (16)
5/8
(16)
LOW VOLTAGE
(RIGHT SIDE)
LINE VOLTAGE
(LEFT SIDE)
Downflow Position
(Kit number 83M57 (LB−909844A) required to convert
unit to downflow applications.)
1 (25)
Upflow Position
CONDENSATE
DRAINS (2)
(UPFLOW AND
DOWNFLOW)
FILTER
ACCESS
FILTER
ACCESS
H
G
H
G
LINE VOLTAGE
INLETS (TOP &
LEFT SIDE)
5/8
(16)
5/8 (16)
Model No. CB30M-21/26 CB30M-31 CB30M-41 CB30M-46 CB30M-51 & CB30M-65
Dimension inch mm inch mm inch mm inch mm inch mm
A45-1/4 1149 49-1/4 1251 51 1295 52-1/2 1334 58-1/2 1486
B16-1/4 413 21-1/4 540 21-1/4 540 21-1/4 540 21-1/4 540
C20-5/8 524 20-5/8 524 22-5/8 575 22-5/8 575 24-5/8 625
D14-3/4 375 19-3/4 502 19-3/4 502 19-3/4 502 19-3/4 502
E19 483 19 483 21 533 21 533 23 584
F15 351 20 508 20 508 20 508 20 508
G24-5/8 625 24-5/8 625 26-3/8 670 27-7/8 708 27-7/8 708
H20-5/8 524 24-5/8 625 24-5/8 625 24-5/8 625 30-5/8 778

Page 5
CB29M/CB30M SERIES
CB30M Horizontal Left− and Right−Hand Unit Dimensions − inches (mm)
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR
OPENING
FILTER
LOW VOLTAGE
INLETS (BOTTOM
& RIGHT SIDE)
Top View
Front View
BLOWER
H
B
C
D
LIQUID
LINE
SUCTION
LINE
CONDENSATE
DRAINS (2)
(UPFLOW AND
DOWNFLOW)
CONDENSATE
DRAINS (2)
(HORIZONTAL)
COIL
3/4
(19)
3/4
(19)
1-1/2
(38)
1-3/4
(44)
5-3/4
(46)
2
(51)
1-1/8
(29)
RETURN
AIR
OPENING
F
E
5/8
(16)
5/8
(16)
5/8
(16)
End View
AIR
FLOW
OPTIONAL ELECTRIC
HEAT (FIELD−INSTALLED)
11-1/16
(281)
LINE VOLTAGE
INLETS (TOP &
RIGHT SIDE)
5-3/8
(137)
4-3/8
(111)
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR
OPENING
FILTER
LOW VOLTAGE
INLETS (TOP &
LEFT SIDE)
End View
BLOWER
B
C
D
COIL
3/4
(19)
3/4
(19)
3/4
(19)
RETURN
AIR OPENING
F
E
5/8
(16)
5/8
(16)
5/8
(16)
End View
AIR
FLOW
OPTIONAL ELECTRIC
HEAT (FIELD INSTALLED)
LINE VOLTAGE INLETS
(BOTTOM & LEFT SIDE)
Horizontal Position (Right-Hand Air Discharge)
FILTER ACCESS
FILTER
ACCESS
5-3/4
(146)
1-1/2
(38)
1-3/4
(44)
CONDENSATE DRAINS (2)
(HORIZONTAL)
A5/8
(16)
G
H
A
5/8 (16)
G
1
(25)
1
(25)
11-1/16
(281)
PIPING
PLATE
DETAIL
LIQUID
LINE
SUCTION
LINE
2
(51)
1-1/8
(29)
5-3/8
(137)
4-3/8
(111)
PIPING
PLATE
DETAIL
Horizontal Position (Left-Hand Air Discharge)
Top View
Front View
3/4
(19)
End View
For dimensions A"
through H", see
chart on Page 4.
Requirements
Installation of Lennox blower coil units with or without op-
tional electric heat must conform with standards in the Na-
tional Fire Protection Association (NFPA) Standard for
Installation of Air Conditioning and Ventilation Systems
NFPA No. 90A," and Standard for Installation of Resi-
dence Type Warm Air Heating and Air Conditioning Sys-
tems NFPA No. 90B," manufacturer’s installation instruc-
tions and local municipal building codes.
This unit is certified for installation clearances to combus-
tible material as listed on the unit rating plate. Accessibility
and service clearances must take precedence over com-
bustible material clearances.
Installation
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser-
vice must be performed by a qualified installer or
service agency.
The CB29M and CB30M units are factory−configured for
upflow or horizontal right−hand discharge installation. For
downflow or horizontal left−hand discharge, some field
modification is required.

Page 6
504719M 09/05
IMPORTANT
Kit number 83M57 (LB−109844A) must be installed
for downflow application.
Disassembling CB30M Blower Coil Unit
These units are shipped from the factory fully assembled.
The CB30M blower coil unit’s sections may be separated
to facilitate movement at some installation sites. If re-
quired, disassemble the unit as follows:
1. Remove access panels from both blower and coil as-
semblies. This will lighten the cabinet for lifting.
2. 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.
3. To reassemble, align cabinet sections and reinstall
screws. Replace access panels.
Upflow Application
1. Remove access panels. Remove corrugated padding
from the space between the blower and coil assem-
blies.
2. To ensure proper operation, remove the horizontal
drain pan from units in upflow configurations (see fig-
ure 1).
3. Place unit in desired location. Make sure that unit is
level. Connect return and supply air plenums as re-
quired using sheet metal screws.
4. Install units that have no return air plenum on a mount-
ing stand at least 14" from the floor for proper air re-
turn. Lennox offers an optional upflow unit stand.
(45K31 for CB29M−21, −26, and −31; 45K32 for
CB29M−41 through −65.)
Figure 1
Upflow Configuration
Horizontal Drain Pan
(Remove for Opti-
mum Performance)
Upflow/
Downflow
Drain Pan
Horizontal Right−Hand Discharge Application
1. Remove access panels. Remove corrugated padding
from the space between the blower and coil assembly.
2. No further adjustment is necessary. Set unit so that it is
sloped 1/4 inch toward the drain pan end of the unit.
NOTE − For horizontal applications, an auxiliary drain
pan is recommended. Refer to local codes.
NOTE − For horizontal applications in high humidity
areas, seal around the exiting drain pipe, liquid line,
and suction line to prevent infiltration of humid air.
Figure 2
Right−Hand Discharge Configuration
No Adjustment
is Necessary
Horizontal Drip ShieldUpflow/
Downflow
Drain Pan
Horizontal
Drain Pan
3. If the unit is to be suspended, it must be supported
along the entire length of the cabinet (see figure 3). If
using a chain or strap, attach a piece of angle iron or
sheet metal to the unit (either above or below the unit),
so that the full length of the cabinet is supported. Use
securing screws which are no longer than 1/2 inch to
avoid damaging the coil or filter. Use sheet metal
screws to connect the return and supply air plenums.
Figure 3
Suspending Horizontal Unit
FRONT VIEW END VIEW
Angle Iron or
Sheet Metal
Electrical Inlet Clearance
4 in. (102 mm)
1/2 IN.
SCREWS
MAX.
CAUTION
When removing the coil, there is possible danger of
equipment damage and personal injury. Be careful
when removing the coil assembly from a unit
installed in right− or left−hand applications. The coil
may tip into the drain pan once it is clear of the cabi-
net. Support the coil when removing it.

Page 7
CB29M/CB30M SERIES
Horizontal Left−Hand Discharge Application
NOTE − For horizontal applications, an auxiliary drain pan
is recommended. Refer to local codes.
Remove the access panels and the corrugated padding
from the space between the blower and coil assembly be-
fore operation. Make the following modifications:
1. (See Detail A in figure 4.) Pull coil assembly from unit.
Pull off the horizontal drain pan.
2. Remove drain plugs from back drain holes on horizon-
tal drain pan and re−install them on front holes.
3. Rotate drain pan 180° front to back and install it on the
opposite side of coil.
ORIGINAL
PLUG
LOCATION
NEW PLUG
LOCATION
PLUGGED
END
OPEN END FOR
CONDENSATION
DRAIN
COIL
ASSEMBLY
Left-Hand Discharge Modifications
Figure 4
90_
BEND
CABINET
SUPPORT
Coil shown in upflow position for easy conversion
TOP CAP
SCREWS
TOP CAP ROTATED TO
CORRECT POSITION
BACK COIL
END SEAL
TOP
CAP
90_
BEND
ALIGN HOLES
WITH HOLES
IN COIL END
PLATE.
DRAIN PAN
Detail A
(DRAIN
PAN)
Detail B
(TOP CAP)
Detail C
4. (See Detail B and C in figure 4.) Remove screws from
top cap. Remove horizontal drip shield screw located
in the center of the back coil end seal.
5. Rotate horizontal drip shield 180° front to back.
6. Remove plastic plug from left hole on coil front end
seal and re−install plug in back hole. Re−install horizon-
tal 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 un-
used 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. See figure 4.
NOTE − Use extreme care when re−installing screws
into coil end plate engaging holes. Misaligned screws
may damage coil.
8. (See figure 5.) From the upflow position, flip cabinet
90° to the left and set into place. Replace coil assem-
bly. Secure coil in place by bending down tab on cabi-
net support rail.
Figure 5
Left−Hand Discharge Configuration
Horizontal
Drip Shield
Horizontal
Drain Pan
Securing Tab on
Cabinet Support Rail
NOTE − For horizontal applications in high humidity
areas, seal around the exiting drain pipe, liquid line
and suction line to prevent infiltration of humid air.
9. Knock out drain seal plate from access door. Secure
plate to cabinet front flange with screw provided.
10. Flip access door and replace it on the unit.
11. Set unit so that it is sloped 1/4 inch toward the drain
pan end of the unit. Connect return and supply air ple-
nums as required using sheet metal screws.
12. If the unit is to be suspended, it must be supported
along the entire length of the cabinet (see figure 3). If
using a chain or strap, attach a piece of angle iron or
sheet metal to the unit (either above or below the unit),
so that the full length of the cabinet is supported. Use
securing screws which are no longer than 1/2 inch to
avoid damaging the coil or filter. Use sheet metal
screws to connect the return and supply air plenums.

Page 8
504719M 09/05
Downflow Application
NOTE − If downflow application is required, separately or-
der kit number 83M57 and install per kit’s instructions.
Also, use metal or class I supply and return air plenums.
WARNING
If electric heat section with circuit breakers (ECB29)
are applied to downflow CB29M or CB30M unit, cir-
cuit breakers must be rotated 180_to the UP posi-
tion. See ECB29 installation instructions for more
details.
Figure 6
Combustible
Floor Additive
Base
Properly−Sized
Floor Opening
BLOWER
COIL UNIT
Combustible Flooring Additive Base
On combustible flooring, use an additive base (figure 6).
Cut an appropriately sized opening for combustible base
(see dimensions in figure 7). Set the additive base into
opening. Connect supply 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.
TOP VIEW
OPENING
SIDE VIEW
1-5/8 (41)
11-3/8
(289)
2 (51)
22-1/8 (562)
5/8 (16) 13-3/8 (340)
SUPPLY
AIR
OPENING
Figure 7
18−1/4 (464)
CB29M−21/26 & 31
CB30M−21/26
23−1/4 (591)
CB29M−41 to −65
CB30M−31 to 65
Downflow Combustible Base Dimensions
15 (381)
CB29M−21/26 & 31
CB30M−21/26
20 (508)
CB29M−41 to −65
CB30M−31 to 65
1-5/8 (41)
1-5/8 (41)
inches
(mm)
If the homeowner reports water dripping from supply air dif-
fusers, check the shields and tape. Make sure the tape is
completely attached to the edges of the drip shield, and
that the drip shield is wedged firmly in place.
Field Piping Connections
All CB29M/CB30M coils are equipped with a factory−
installed, internally mounted expansion valve. Use Lennox
L15 (sweat) series line sets as shown in Table 1 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.
Table 1
Refrigerant Line Sets
CB29M
CB29M
Unit
Liquid
Line No.
Vapor/
Suction Line
L10
Line Sets
L15
Line Sets
−21/26 3/8 in
(8 mm)
5/8 in
(16 mm)
L10−26
20 ft. − 50 ft.
(6 m − 15 m)
L15−26
20 ft. − 50 ft.
(6 m − 15 m)
−31 −41 3/8 in
(10 mm)
3/4 in.
(19 mm
L10−41
20 ft. − 50 ft.
(6 m − 15 m)
L15−41
20 ft. − 50 ft.
(6 m − 15 m)
−46 −51 3/8 in
(10 mm)
7/8 in.
(22 mm)
L10−65
30 ft. − 50 ft.
(9 m − 15 m)
L15−65
30 ft. − 50 ft.
(9 m − 15 m)
−65 3/8 in
(10 mm)
1−1/8 in.
(29 mm)
FIELD
FABRI-
CATED
FIELD
FABRI-
CATED
NOTE − CB29M/CB30M series evaporators use nitro-
gen 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.
1. Use a wet rag to protect TXV bulb (or remove it) when
brazing suction line.
2. Be aware of filter access panel when connecting lines.
Filter must be accessible.
3. Place heat shield (damp rag) against piping plate and
around the suction line connection. Heat shield must
be in place to guard against damage to the paint.
4. With heat shield in place, sweat in suction line elbow,
provided, and line set. After procedure is completed,
remove heat shield.
5. Place heat shield against piping plate and around the
liquid line connection. Sweat in the liquid line elbow
(provided) and the line set.
6. Refer to instructions provided with outdoor unit for leak
testing, evacuating and charging procedures.

Page 9
CB29M/CB30M SERIES
Condensate Drain
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 8 for typical condensate trap con-
figuration.
Figure 8
Minimum 1 inch (25 mm) pitch
per 10 feet (3048mm) of line
Pipe diameter difference
Trap must be deep enough to
offset maximum static difference
(generally, 2" [51mm] minimum).
Typical Condensate Drain Connection
Coil
drain
pan
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 9 for auxiliary and main drain locations.
Figure 9
Left−Hand
Discharge
Main drain on rightAuxiliary drain on left
Upflow or
Downflow
Right−Hand
Discharge
The following practices are recommended to ensure con-
densate removal (see figures 8 and 9):
1. Drain piping should not be smaller than the drain con-
nections at drain pan.
2. A trap must be installed in the main drain line.
3. 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.
4. Horizontal runs must be sloped 1 inch per 10 feet of
drain line to offset friction.
5. An open vent in drain line will sometimes be required due
to line length, friction and static pressure.
6. Drain construction and routing should facilitate future
cleaning and must not interfere with filter access.
7. Auxiliary drain should run to an area where homeown-
er will notice any drainage. Refer to local codes.
Filters
IMPORTANT
Filter access panel must be in place during unit op-
eration. Excessive warm air entering the unit may re-
sult in water blow−off problems.
Each unit includes a factory−installed filter. 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.
Reusable filters supplied with some units can be washed
with water and mild detergent. Some units are equipped
with standard throw−away type filters which should be re-
placed when dirty.
To remove filter, loosen the thumbscrews holding the filter
panel in place. Slide filter out of the guides on either side of
cabinet, insert new filter and replace panel. See Table 2 for
replacement filter sizes.
Table 2
Filter Dimensions
Unit Model No.
Filter Size
Inches (mm)
CB29M/CB30M−21/26, CB29M−31 15 x 20 (381 x 508)
CB29M−41, −46, CB30M−31 20 x 20 (508 x 508)
CB29M−51, −65, CB30M−41, −46 20 x 22 (508 x 559)
CB30M−51, −65 20 x 24 (508 x 610)
Sealing the Unit
It is very important to 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 Armaflex material or with
Permagum. Permagum may also be used to seal around
the main and auxiliary drains and around open areas of
electrical inlets.

Page 10
504719M 09/05
Blower Speed Adjustments
Minimum Blower Speeds (With Electric Heaters)
For the minimum allowable speed for the CB29M/CB30M
series units with electric heat, refer to the ECB29 installa-
tion instructions.
Air Volume Adjustment
Blower speed selection is accomplished by changing the
taps at the harness connector at the blower motor. See fig-
ure 10. Refer to unit wiring diagram in figure 11. Refer to
Tables 3 through 20 for blower performance data.
Blower Speed Tap Selection
Figure 10
harness
connector
Press the tab to release wire connector.
select connector location for new speed.
Insert wire until it clicks.
Table 3
CB29M-21/26 Blower Performance (208/230V)
External Static Air Volume and Motor Watts at Specific Blower Taps
External
Static
Pressure Low Medium High
in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts
.00 0 700 330 245 895 420 310 1030 485 375
.05 10 690 325 240 875 415 305 1010 475 370
.10 25 680 320 235 865 410 300 990 470 365
.15 35 665 315 230 850 400 290 970 460 355
.20 50 655 310 225 830 390 285 955 450 350
.25 60 640 300 220 810 385 280 925 440 345
.30 75 625 295 220 795 375 270 900 425 335
.40 100 595 280 210 750 355 255 850 400 320
.50 125 555 260 195 700 330 240 800 380 305
.60 150 510 240 185 640 300 225 725 340 290
.70 175 395 185 165 - - - - - - - - - - - - 620 295 265
.75 185 - - - - - - - - - - - - - - - - - - - - - - - - 570 270 255
NOTE − All air data is measured external to unit with air filter in place. Electric heaters have no appreciable air resistance.
Table 4
CB29M-31 Blower Performance (208/230V)
Air Volume and Motor Watts at Specific Blower Taps
External Static Pressure Low Medium High
in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts
.00 0 1015 480 385 1135 535 410 1230 580 450
.05 10 995 470 375 1120 530 400 1205 570 445
.10 25 980 465 365 1095 515 390 1190 560 440
.15 35 960 455 355 1075 505 380 1165 550 430
.20 50 945 445 345 1050 495 375 1140 540 425
.25 60 925 435 335 1025 485 365 1105 520 415
.30 75 900 425 325 1005 475 355 1080 510 405
.40 100 860 405 305 950 450 335 1025 485 390
.50 125 800 380 285 890 420 315 960 450 370
.60 150 740 350 265 810 385 290 875 415 350
.70 175 670 315 240 735 345 270 790 375 330
.75 185 610 290 225 675 320 255 725 340 315
NOTE − All air data is measured external to unit with air filter in place. Electric heaters have no appreciable air resistance.