271001-UIM-A-0407
6
Unitary Products Group
RESIDENTIAL AND MODULAR HOME UPFLOW
RETURN PLENUM CONNECTION
Return air may enter the furnace through the side(s) or bottom depend-
ing on the type of application. Return air may not be connected into the
rear panel of the unit. In order to achieve the airflow indicated, it is rec-
ommended those applications over 1800 CFM (57 m³/min) use return
air from two sides, one side and the bottom or bottom only. For single
return application, see data and notes on blower performance data
tables in this manual.
BOTTOM RETURN AND ATTIC INSTALLATIONS
Bottom return applications normally pull return air through a base plat-
form or return air plenum. Be sure the return platform structure or return
air plenum is suitable to support the weight of the furnace.
The furnace base is equipped with a rectangular blockoff panel that can
be removed by performing the following steps:
1.
Lay the furnace on its back.
2.
Remove the screws from the toe plate.
3.
Remove the toe plate.
4.
Pull the base plate out of the furnace base.
5.
Reinstall the toe plate and secure with the screws that were
removed.
Attic installations must meet all minimum clearances to combustibles
and have floor support with required service accessibility.
IMPORTANT:
If an external mounted filter rack is being used see the
instructions provided with that accessory for proper hole cut size.
HORIZONTAL MODELS
IMPORTANT:
This furnace may be installed in a horizontal position on
either side as shown above.
It must not be installed on its back.
FIGURE 1:
Dimensions
A
40
FRONT
B
3/4
26-3/4
1-1/2
1-1/4
C
20
5/8
5/8
B
24-3/4
BOTTOM IMAGE
RETURN END
TOP IMAGE
SUPPLY END
D
4” DIA. VENT
CONNECTIONS
LEFT SIDE
RIGHT SIDE
20
30-1/8
(VENT CONNECTIONS)
POWER WIRING
7/8” HOLE
ACCESS
WIRING
7/8” K.O.
1-1/8
2-1/4
14
23-1/2
GAS INLET
1-1/4 x 2-1/2
4” Diameter
1-1/4
GAS INLET
1-1/4 x 2-1/2
T’STAT
WIRING
7/8” K.O.
TABLE 4:
Cabinet and Duct Dimensions
BTUH Input
CFM (m
3
/min)
Cabinet
Size
Cabinet Dimension
MBH
kW
A
A (cm)
B
B (cm)
C
C (cm)
D
D (cm)
57/42
17.6/12.3
1200 (33.98)
A
14 1/2
36.8
13 1/4
33.6
11 1/2
25.7
10 1/8
25.7
80/59
23.4/17.3
1200 (33.98)
A
14 1/2
36.8
13 1/4
33.6
11 1/2
25.7
10 1/8
25.7
80/59
23.4/17.3
1600 (45.31)
B
17 1/2
44.4
16 1/4
41.3
14 1/2
36.8
11 5/8
29.5
80/59
23.4/17.3
1600 (45.31)
C
21
53.3
19 3/4
50.2
18
45.7
13 3/8
34
100/65
29.3/19.1
1600 (45.31)
B
17 1/2
44.4
16 1/4
41.3
14 1/2
36.8
11 5/8
29.5
100/65
29.3/19.1
1600 (45.31)
C
21
53.3
19 3/4
50.2
18
45.7
13 3/8
34
100/65
29.3/19.1
2000 (56.63)
C
21
53.3
19 3/4
50.2
18
45.7
13 3/8
34
120/78
35.2/22.9
2000 (56.63)
C
21
53.3
19 3/4
50.2
18
45.7
13 3/8
34
