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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 EXTERN
A
L 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