Page 35
Corp. 1244-L9
IV. SYSTEM OPERATION AND SERVICE
SYSTEM OPERATIONAL MODES
Air conditioner systems have four modes of operation. Heat pumps have five operational modes. These modes are:
* Auto
* Cooling
* Dehumidification
* Fan
* Heat (HP model only)
AUTO MODE
Auto Mode - Non-adjustable indoor temperature set points are 68F°and 77°F (20°C and 25°C)
NOTE — Reversing valve is de-energized in cooling mode and energized in heating mode.
AUTO MODE
FIGURE 49
Protective Functions
Delays that normally protect the compressor are disabled during defrost cycles:
1. Minimum three (3) minute compressor time delay between operating cycles.
2. Minimum six (6) minute compressor run time between operating cycles.
Auto — Cool
If room ambient temperature is equal to or greater than 77°F (25°C), the unit cycles cooling ON. When the room ambient
temperature is equal to or less than 77°F (25°C) minus 3.6°F (2°C), the compressor will cycle OFF, the outdoor fan will cycle
OFF 60 seconds later. The indoor fan will run continuously at a preset speed until system has a heating demand or Auto Mode
is switched OFF.
Auto — Heat
If room temperature is equal to or less than 64°F (18°C) plus 3.6°F (2 C), the heating will cycle ON when room temperature is
equal to or greater than 64°F (18°C) plus 9.0°F (5°C), the compressor will cycle OFF. The outdoor fan will cycle OFF 60
seconds later. The indoor fan will cycle OFF after 60 seconds on low speed.
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