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BASIC HEAT PUMP THEORY By: Lloyd A. Mullen By: Lloyd G. Williams Service Department, York Division, Borg-Warner Corporation Timer runs for one hour and then closes "TM" contacts. 3R relay is in series with"TM" contacts and is energized when "TM" is closed. 3R2 contacts are also in series with 3R coil and in parallel with "TM" contacts, thus 3R2 contacts hold 3R coil energized one "TM" contacts are closed. After twenty-seconds,"TM" contacts open, but 3R coil is held energized by 3R2. 3R1, normally closed, in series with "RC" valve coil, stops outdoor fan and de-energizes "RC" valve. This allows the unit to operate as a cooling unit, with outdoor or condenser fan stopped. Head pressure and resultant temperature will rise rapidly and melt frost from coil. Defrost Termination Figure 26F09 illustrates wiring details of control to terminate defrost cycle, the defrost termination switch, which can be temperature or pressure operated, senses liquid line temperature or pressure and at a pre- determined point opens circuit to 3R. When 3R1 reverts to its normally closed position, outdoor fan starts and "RC" valve is energized into heat position. Unit is now on heating cycle. Service Application Manual SAM Chapter 620-54 Section 18 17PDF Image | BASIC HEAT PUMP THEORY INTRO
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