Std Compressor Overload Protection; Cooling Fan Control For Radiation Fin Temperature Of Function Unit; Heater Control For Function Unit Switch Box - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
7.5

STD Compressor Overload Protection

★
7.6 Cooling Fan Control for Radiation Fin Temperature of
Function Unit
When the inverter fin temperature of function unit rises, it is cooled with the fan (M1F) as
follows.
Fan OFF
7.7

Heater Control for Function Unit Switch Box

The heater (E2HC) places to the function unit switch box to prevent freezing by low outdoor
temperature, and it is controlled as follows by the outdoor temperature.
The operation range of function unit "ON" (Outdoor temp. < -20°C)
The range of compressor stop
Function
This control is used to prevent abnormal heating due to overcurrent to the compressor
resulting from failures of STD compressor such as locking.
STD compressor ON
Demand to operate.
STD compressor OFF for 30 min.
When occurring 3 times within 90 min.,
the malfunction code "
52C1 = ON
&
Inverter Fin Temp. thermistor > 50°C
52C1 = OFF
OR
Inverter Fin Temp. thermistor < 30°C
CT detection current value>14.95A
E6
" is output.
"OFF" (Outdoor temp. > -17°C)
"ON" (Outdoor temp. < -17°C)
"OFF" (Outdoor temp. > -14°C)
Protection Control
Fan ON
104