SIDE RETURN AIR APPLICATIONS
The CB30U unit is shipped from the factory ready for
bottom return air application. You can order an optional
side return air filter kit as listed in table 2.
Table 2. Optional Side Return Air Filter Kit
Model Kit Number
-21 and-26 65K23
All other models 65K24
Use the following procedures to configure the unit for side
return air operations:
Step 1,
Step 2,
Step 3.
Remove the coil access panel,
Remove the coil assembly from the cabinet,
Cut the side or sides of the cabinet used for
return air according to the dimensions given in
figure 1 and table 1. For -41, 46, -51 and -65
units, it is recommended that return air come into
the unit from both sides. Therefore, both sides of
the cabinet should be cut for these units,
Step 4.
Step 5.
Set the unit so that it is level. Seal the bottom
opening of the cabinet,
Connect the return and supply air plenums as
required.
B
CUT BOTH SIDES OF CABINET FOR -41/46, -51 AND -65 UNITS.
Figure 1. CB3OU Side Return Air Dimensions
Table 3. Side Return Air Dimensions
CB3OU CB30U CB30U CB30U-51
Model # -21/26 -31 -41/46 CB30U-65
inch (mm) inch (mm) inch (mm) inch (mm)
18-1/4
A 14-1/4 (362) 18-1/4 (464) (464) 18-1/4 (464)
B 1-1/8 (29) 1-1/8 (29) 2-1/8 (54) 3-1/8 (79)
All CB30U coils are equipped with a factory-installed,
internally mounted expansion valve. Use Lennox L15
(sweat) series line sets as shown in table 2 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.
_WARNING
SUCTION LINE
LIQUID LINE
I AIR HANDLER UNIT
Figure 2. Brazing Connections
Ak IMPORTANT
Table 4. Refrigerant Line Sets
VAPOR/
CB30MV LIQUID SUCTION L10 L15
UNIT LINE LINE SETS LINE SETS
LINE
L10-26 L15-26
3/8 in 5/8 in.
-21/26 (10 mm) (16 mm) 20 ft, - 50 ft, 20 ft. - 50 ft.
(6m- 15m) (6m-15m)
L10-41 L15-41
3/8 in 3/4 in,
-31 -41/16 (10 mm) (19 mm) 20 ft, - 50 ft. 20 ft. - 50 ft.
(6 m - 15 m) (6 m- 15 m)
L10-65 L15-65
3/8 in 7/8 in.
-51 30 if, - 50 ft, 30 ft. - 50 ft.
(10 mm) (22 mm) (9 m - 15 m) (9 m- 15 m)
3/8 in 1-1/8 in, FIELD FIELD
-65 (10 ram) (29 ram) FABRICATED FABRICATED
Page 4
505340M 07/07
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