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Table 29 — Belt Drive Plenum Fan Dimensions (in.)
39M UNIT SIZE
FAN
WHEEL
SUPPLY
RETURN
123
03W
153
06W,08W
06W,08W
163
08W
183Q
10W
12W,14W,
12W,14W,
223Q
17W
243Q
17W,21W
17W,21W
273Q
21W,25W
21W,25W
303Q
25W,30W
25W,30W
30W,36W,
30W,36W,
333Q
40W
36W,40W,
36W,40W,
363Q
50W
403Q
—
50W,61W
443Q
61W
50W,61W
493Q
—
40
72W
44
72W,85W
72W,85W
85W,96W,
85W,96W,
49
110W
110W
55
110W
110W
Table 30 — Direct Drive Plenum Fan Assembly with
NEMA Motor — Dimensions (in.)
FAN
39M UNIT SIZES
WHEEL
105
03W
122
03W
135
06W
150
06W,08W
165
06W,08W
182
08W,10W,12W
200
10W,12W,14W,16T
12W,14W,16T,17W,
222
18T
14W,16T,17W,18T,
245
21W,22T,25T
17W,21W,22T,25W,
270
25T,27T,30W,30T,
35T
21W,22T,25W,25T,
300
30T,36W,37T
25W,30W,30T,35T,
330
40W
30W,35T,36W,37T,
365
40W,50W,61W
36W,37T,40W,50W,
402
61W
LENGTH WIDTH HEIGHT
03W
41.0
23.4
42.5
36.0
08W
24.8
46.5
10W
26.3
53.3
29.6
58.3
17W
32.6
62.5
36.5
66.3
38.8
70.3
41.0
75.8
40W
48.9
91.4
50W
40W
48.9
91.4
50W
57.4
99.4
57.4
99.4
61W
57.4
99.4
72W
34.2
92.2
38.0
100.0
41.3
107.8
52.3
114.7
FAN SLED ASSEMBLY
LENGTH
WIDTH
HEIGHT
21.0
19.4
22.5
21.6
23.6
22.7
27.0
25.4
27.8
27.0
31.1
29.1
32.8
31.5
36.3
34.6
37.8
37.4
40.6
41.0
46.6
44.7
48.4
47.9
51.8
51.4
54.8
52.3
Table 31 — Direct Drive Plenum Fan Assemblies with
Fan
Supplier
Wheel
23.7
310
26.2
310
29.1
310
400
31.3
400
36.7
40
EBM
400
40.1
450
41.4
450
45.4
450
48.9
450
500
54.4
500
310
58.3
310
58.4
310
64.0
310
70.0
350
56.4
350
61.4
400
ZA
400
68.9
400
76.4
400
450
450
500
560
Fan Motors and Drives
18.2
When installing motors in the field, locate the electrical junction
20.2
box toward the center of the unit. This arrangement is required for
21.0
correct belt tension. Use the smallest mounting holes in the
22.9
mounting base that will accommodate the motor and provide min-
24.5
imum overhang.
26.8
Tighten the motor holddown bolts. Refer to Table 5 for fan scroll
29.5
inlet cone dimensions.
32.0
JUNCTION BOX CONDENSATE PREVENTION
When air handlers are installed outdoors in a high humidity envi-
34.9
ronment or indoors where the apparatus room is used as a fresh air
plenum, precautions must be taken to prevent condensation from
34.7
forming inside the junction box of the internally mounted motor.
Standard installation practice is to mount the motor starter or fused
40.9
disconnect box adjacent to the air handler and enclose the power
wiring to the motor in flexible conduit.
43.5
The sheet metal housing of the disconnect switch or motor starter
is not airtight (even when a box meeting NEMA [National Electri-
46.7
cal Manufacturers Association] IV standards is used). Thus, warm
53.6
moist air can migrate through the flexible conduit to the junction
box on the motor. With the motor located inside the unit, the motor
temperature is that of the cool supply air, so condensate can form
inside the junction box and, possibly, on the live terminal lugs.
To prevent the moist air from migrating through the conduit to the
motor, seal the power wires inside the flexible conduit at the motor
starter or fused disconnect (Fig. 53).
Use a nonconductive, non-hardening sealant. Permagum (manu-
factured by Schnee Morehead) or sealing compound, thumb grade
(manufactured by Calgon), are acceptable materials.
116
EC Motors, Dimensions (in.)
Motor
Assembly
kW
Height
1.50
19.70
3.05
19.70
2,95
19.70
6.10
19.70
6.40
19.70
3.65
19.70
3.80
19.70
3.85
24.80
4.45
24.80
5.05
24.80
5.45
24.80
5.70
24.80
6.40
24.80
2.20
18.50
1.90
18.50
1.35
18.50
3.80
17.72
2.50
19.69
1.90
19.69
4.10
21.65
3.40
21.65
5.40
21.65
5.80
21.65
3.60
24.80
5.60
24.80
5.40
26.38
5.20
28.74
Assembly
Assembly
Width
Length
19.70
13.78
19.70
14.06
19.70
14.06
19.70
16.83
19.70
16.83
19.70
16.37
19.70
16.37
24.80
17.88
24.80
17.88
24.80
22.46
24.80
22.46
24.80
23.66
24.80
23.66
18.50
11.61
18.50
11.61
18.50
11.61
17.72
12.99
19.69
12.44
19.69
12.44
21.65
14.49
21.65
14.49
21.65
14.49
21.65
13.58
24.80
15.63
24.80
15.63
26.38
17.76
28.74
19.02
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