7
Return Air Ducting
The dimensions of the return air duct or platform must be at a
minimum the same size as the return air opening on the air
handler, regardless of the air handler position.
When framing a return air platform, the opening size should be
as shown below. If the air handler is to be installed in a closet,
be sure to allow room for wiring and refrigerant lines.
Return Air Platform Height
If the air handler is to be used in the upflow position, the height
of the return air platform should be no smaller than the height
listed below for the specific model of air handler.
MODEL
A
B
C
D
E
F
IN
CM
IN
CM
IN
CM
IN
CM
IN
CM
IN
CM
Platform
Model
Height
Inches
Cm
AFPB24A1, AFPB24B1
12
30.5
AFPB36A1
14
35.6
AFPC48A1, AFPC48B1
16
40.6
AFPC60A1, AFPC60B1
18
45.7
Framed-in
Opening
B
A
C
D
E
Air
Handler
Bottom
Top View
F
AFPB24A1
AFPB24B1
AFPB36A1
AFPC48A1
AFPC48B1
AFPC60A1
AFPC60B1
14
37.3 14
1
/
4
36.2 2
5
2
5
4
10.1 4
10.1
14
37.3 14
1
/
4
36.2 2
5
2
5
4
10.1 4
10.1
14
37.3 14
1
/
4
36.2 2
5
2
5
4
10.1 4
10.1
16
3
/
8
41.6 22
1
/
4
56.5 3
7.6
3
7.6 1
3
/
4
4.4
2
5
16
3
/
8
41.6 22
1
/
4
56.5 3
7.6
3
7.6 1
3
/
4
4.4
2
5
16
3
/
8
41.6 22
1
/
4
56.5 3
7.6
3
7.6 1
3
/
4
4.4
2
5
16
3
/
8
41.6 22
1
/
4
56.5 3
7.6
3
7.6 1
3
/
4
4.4
2
5
11
8
WARNING
BEFORE PERFORMING ANY WORK ON THIS EQUIPMENT,
POWER SUPPLY MUST BE TURNED OFF AT THE
HOUSEHOLD SERVICE BOX TO AVOID THE POSSIBILITY
OF SHOCK, INJURY, DAMAGE TO EQUIPMENT OR DEATH.
LINE VOLTAGE CONNECTIONS
1. The power supply can be connected through the right side
or top of the air handler. Conduit knockouts are provided
for
1/2
”,
3/4
”, 1”, and 1
1/4
” conduit.
2. Refer to the Control System section for recommended low-
voltage wire gauges.
3. See Power Supply Table on page 9 for power supply
specifications.
4. Use only copper conductors for supply wiring.
5. The air handler must be permanently grounded.
The ground lug is located in the field wiring box.
Conduit knockouts
Right side of
air handler
Top of air
handler
11
9
11
10
Grounding lug
Field wiring box
(detail)
Conduit knockouts
Ductwork
This air handler shall not be installed without supply plenums
and proper ducting. Connect supply air duct over 1/2“ flanges on
supply air opening. Secure duct to flange and seal connection.
Use flexible connectors between ductwork and unit at discharge
connection. Ductwork passing through unconditioned space
must be insulated and covered with vapor barrier.
Conduit Knockout Locations
Grounding Lug Location
