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For PSC systems, the ½ hp motor is equipped with 4 speeds. The unit is set for mid-fire temp rise @
65ºF. See table for proper blower motor set up:
OH6FA072D48
ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE
COOLING UNIT
HTG Speed by Input
Low Mid High
Fire Fire Fire
Recommended CLG Speed
24,000
Low
ML
MH
Low
30,000
Low
ML
MH
Med Low
36,000
Low
ML
MH
Med High
42,000
Low
ML
MH
Med High
48,000
Low
ML
MH
High
Figure 19A: Heating speed by input
Speed Tap\ Static
Pressure
Furnace Airflow (CFM) vs. External Static pressure (in. WC.)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Low
930
915
912
910
822
774
730
ML
1155
1152
1130
1126
1085
1042
920
MH
1442
1432
1418
1382
1334
1293
1230
High
1802
1762
1705
1635
1569
1493
1428
Furnace Motor Current Draw (Amps) vs. External Static pressure (in. WC.)
Low
3.3
3.1
3.0
2.9
2.6
2.5
2.4
ML
4.2
4.0
3.9
3.7
3.6
3.3
3.0
MH
5.4
5.2
5.0
4.7
4.4
4.2
4.0
High
6.6
6.4
6.0
5.7
5.5
5.2
5.0
Speed Tap\ Static
Pressure
High Fire Temperature Rise vs. External Static pressure (in. WC.)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Low
90
91
91
92
101
108
114
ML
72
72
74
74
77
80
91
MH
58
58
59
60
62
64
68
High
46
47
49
51
53
56
58
Speed Tap\ Static
Pressure
Mid Fire Temperature Rise vs. External Static pressure (in. WC.)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Low
72
73
73
73
81
86
91
ML
58
58
59
59
61
64
72
MH
46
47
47
48
50
52
54
High
37
38
39
41
42
45
47
Speed Tap\ Static
Pressure
Low Fire Temperature Rise vs. External Static pressure (in. WC.)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Low
60
61
61
61
68
72
76
ML
48
48
49
49
51
53
60
MH
39
39
39
40
42
43
45
High
31
32
33
34
35
37
39