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Only for training and service purposes
Part 2 Functions & Controls
5.8 Overheating Protection (Power Module)
5.8.1 9,12kBtu/h Model
• If the temperature of the heat sink thermistor reaches over Toff, the Compressor stop instantly.
• The compressor operating frequency is limited according to the heat sink thermistor. (refer to below FIG.)
• The LED on PCB board will blink 4 times, when the thermistor is open or short, also when the temperature is over T
off.
T off °C
T2 °C
Heat Sink Temp.
T1 °C
T on °C
COMP
Freq.
Free OFF FreeFc-1 Fc-1Fc-2 Fc-2
∆T = (T off - T on)/3
T1 = T on + ∆T
T2 = T on + 2
*
∆T
T on : 85°C(185°F) (Model by Model)
T off : 95°C(203°F) (Model by Model)