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Heat Controller SERVICE MANUAL Packaged Terminal A/C
22
F. Protective Features
1. Frost Protection Mode (heat pump):
When the compressor is running under wired controller’s heating signal. If T outer tube ≤ 28°F (-2°C) is detected for 1 min-
ute successively, the compressor and outdoor fan will stop running. Then indoor fan will run normally according to the wired
controller’s signal. If the heating is required then the heat pump operation will stop the compressor and run the electric
heater solely. However, if T outer tube ≥ 40°F (5°C) is detected for 10 minutes, it will stop the frost protection mode.
2. High temperature protection for evaporator:
When the compressor is running under wired controller’s heating signal, if T inner tube ≤ 136°F (58°C) is detected for 1
minute successively, the compressor and outdoor fan will stop running and the indoor fan will run normally according to the
wired controller’s signal. If heating is required the heat pump operation will stop the compressor and run the electric heater
solely after 15 seconds.
3. Antifreezing protection for evaporator:
Whe the compressor is running under wired controller’s heating signal, if T inner tube ≤ 28°F (-2°C) is detected for 1 minute
successively, the compressor and outdoor fan will stop running and the indoor fan will run normally according to the wired
controller’s signal. (Before the protection, if there isn’t a signal for indoor fan, it will run at medium fan speed. After entering
the protection mode, it will run at the preset fan speed before protection) until T inner tube ≤ 40°F (5°C) is detected for 2
minutes, the the system will quit the antifreezing protection mode.
4. Higher temperature protection for outdoor condenser:
Under the wired controller’s signal, the compressor is running. If T outer tube ≤ 149°F (65°C) is detected for 1 minute suc-
cessively, the high temperature resistant protection mode will be enabled. The compressor will stop running, the indoor fan
will run normally according to the signal of wired controller and the outdoor fan will run constantly until T outer tube ≤131°F
(55°C) is detected for 2 minutes successively then the protection mode will stop.