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For PSC systems, the ½ hp motor is equipped with 5 speeds. The unit is set for mid-fire temp rise @
65ºF. See table for proper blower motor set up: OL6*A072D48
ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE
HTG Speed by Input
COOLING UNIT
Low fire Mid Fire High Fire
Recommended CLG Speed
24,000 ML MED MH Med Low
30,000 ML MED MH Med
36,000 ML MED MH Med High
42,000 ML MED MH High
48,000 ML MED MH High
Furnace Airflow (CFM) vs. External Static pressure (in. WC.)
Speed Tap\ Static
Pressure
0.2 0.3 0.4 0.5 0.6
Low 712 691 682 667 664
ML 902 899 896 883 874
MED 1113 1113 1109 1091 1073
MH 1270 1266 1250 1239 1215
High 1670 1637 1605 1566 1527
Motor Current Draw (Amps/Watts) vs. External Static pressure (in.
WC.)
Low 4.1/408 4.0/398 4.0/395 3.9/385 3.8/378
ML 5.3/540 5.3/535 5.2/527 5.1/512 4.9/500
MED 6.6/665 6.4/644 6.2/634 5.9/609 5.6/584
MH 7.6/772 7.2/739 6.9/713 6.6/682 6.4/663
High 9.6/951 84/830 9.0/887 8.8/869 8.4/835
High Fire Temperature Rise vs. External Static pressure (in. WC.)
Speed Tap\ Static
Pressure
0.2 0.3 0.4 0.5 0.6
Low 119 122 124 127 127
ML 94 94 94 96 97
MED 76 76 76 77 79
MH 66 67 68 68 70
High 51 52 53 54 55
Mid Fire Temperature Rise vs. External Static pressure (in. WC.)
Speed Tap\ Static
Pressure
0.2 0.3 0.4 0.5 0.6
Low 96 99 100 102 103
ML 75 76 76 77 78
MED 61 61 61 62 63
MH 54 54 54 55 56
High 41 42 42 43 45
Low Fire Temperature Rise vs. External Static pressure (in. WC.)
Speed Tap\ Static
Pressure
0.2 0.3 0.4 0.5 0.6
Low 79 81 83 84 85
ML 62 63 63 64 64
MED 51 51 51 52 53
MH 44 44 45 45 46
High 34 34 35 36 37
Figure 19A: Heating speed by input