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BASIC HEAT PUMP THEORY By: Lloyd A. Mullen By: Lloyd G. Williams Service Department, York Division, Borg-Warner Corporation This thermostat is adjustable and can be set to close at desired temperature. Thus, when ODT-1 is closed, TH-2 (mercury switch) will control relay 10R which operates first bank of electric heat. 12R is a time delay relay which operates second bank of heaters. ODT-2 is another adjustable outdoor thermostat which controls operation of 11R time delay relay and third bank of heaters. Contact 3R3 is in parallel with and by-passes ODR-1 on defrost cycle to allow at least one stage of electric heat during defrost cycle when indoor coil is evaporator. PERFORMANCE DATA BTU Output Because of higher outdoor temperatures the heat pump cycle is more economical to operate than auxiliary heaters, an effort should be made to set outdoor thermostats at lowest possible settings commensurate with comfort of conditioned space. Table 26T09C illustrates performance data of a typical three-ton unit. It is apparent that at 0°F outdoor temperature that heat pump will supply 12,250 BTU's. At 70°F it will supply 44,500 BTU's. Other data shows performance with one, two, or three heaters. Table 26T09C — Total Heating Capacity for Typical 3-Ton Unit AIR TEMP. ON OUTDOOR COIL-DEG.F. DEG.F. BTUH 50 BTUH 45 BTUH 40 BTUH 20 BTUH 0 BTUH Auxiliary Heat Requirement This data as plotted in Figure 26F09B with required heat load, shows when it is necessary to use electric heaters to supplement heat pump. Service Application Manual SAM Chapter 620-54 Section 18 AIR TEMP ON INDOOR COIL 70 70 44,500 36,000 34,000 29,400 19,000 12,250 70 " " 47,650 43,050 32,650 25,900 70 " " 61,300 56,700 46,3000 39,550 70 " " 74,950 70,350 59,950 53,200 20PDF Image | BASIC HEAT PUMP THEORY INTRO
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