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