7.5
Operation of Compressor
7.5.1 The compressor operating in cooling mode.
T1≥Ts compressor is on
T1≤Ts-4°F compressor is off
7.5.2 The compressor operating at heating mode.
There are two heating modes: (1) heat pump and (2) electric heater. The electrical heater or
compressor will activate by sensing difference between set point and ambient temperature.
7.5.2.1 The electric heater operation.
• If T1<2°F less than Ts and the fan motor is operating, 3 seconds later the heater will turn on and
operate at low speed. After 30 seconds, it will change to the set speed. If the DAT temperature
is higher than the protection temperature when the heater is operating, the fan motor will turn off
automatically.
• If T1≥2°F more than Ts and the heater is off, and the fan motor will continue working at set
speed. If the DAT temperature is lower than the protection temperature and the fan motor has
been operating for more than 15 seconds, then the fan motor will turn off. If the T2 protection is
triggered, the fan motor will not turn on.
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