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BASIC HEAT PUMP THEORY By: Lloyd A. Mullen By: Lloyd G. Williams Service Department, York Division, Borg-Warner Corporation Figure 26F09B Note that in this illustration heat loaded is 50,000 BTU's at 0°F and 0 BTU's at 70°F. The heat pump will handle the load down to 32°F. Here one or two banks of heaters must be energized. At 9°F a third heater is needed. On an actual installation heaters would be energized at somewhat higher temperatures than indicated in Figure 26F09B to allow for losses not calculated and other variables. Discussing this typical three-ton unit, let's look a little deeper into the operation of the unit. Service Curves Some manufacturers have service curves available for heat pumps similar to Figure 26F10 on this chart suction pressure is across bottom and discharge pressure on left side. Air on outdoor coil in dry bulb temperature and air on indoor coil, wet bulb temperature make up the rest of the data. Service Application Manual SAM Chapter 620-54 Section 18 21PDF Image | BASIC HEAT PUMP THEORY INTRO
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