507270-03B
Page 2 of 58
Issue 1904
Unit Dimensions
1
NOTE
-
C*20 and D*20 (5 Ton) size units installed in upflow
applications that require air volumes of 1800 cfm (850 L/s) or greater
must have one of the following:
1. Single side return air with transition, to accommodate 20 x 25 x 1
in. (508 x 635 x 25 mm) cleanable air filter. (Required to maintain
proper air velocity.)
2. Single side return air with optional “RAB”
R
eturn
A
ir
B
ase.
3. Bottom return air.
4. Return air from both sides.
5. Bottom and one side return air.
See Blower Performance tables for additional information.
2
Optional External Side Return Air Filter kit is not for use with optional
Return Air Base.
* Consider sizing requirements for optional IAQ equipment before
cutting side return opening.
FRONT VIEW
SIDE VIEW
Capacity
A
B
C
D
in.
mm
in.
mm
in.
mm
in.
mm
045-08
070-12
17-1/2
446
16-3/8
416
16
406
1-5/8
194
090-12
090-16
110-20
21
533
19-7/8
505
19-1/2
495
9-3/8
238
135-20
24-1/2
622
23-3/8
594
23
584
11-1/8
238
Summary of Contents for BG921UH
Page 3: ...507270 03B Page 3 of 58 Issue 1904 Parts Arrangement Figure 1 ...
Page 24: ...507270 03B Page 24 of 58 Issue 1904 Figure 25 Figure 26 ...
Page 38: ...507270 03B Page 38 of 58 Issue 1904 Figure 58 Trap Drain Assembly Using 1 2 PVC or 3 4 PVC ...
Page 44: ...507270 03B Page 44 of 58 Issue 1904 Figure 67 Typical Wiring Diagram ...