Actuator Control - Mitsubishi Electric MUZ-SF25VE-E1 Service Manual

9

ACTUATOR CONTROL

MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH
MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH
9-1. OUTDOOR FAN MOTOR CONTROL
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
Compressor
Outdoor fan
motor
9-2. R.V. COIL CONTROL
Heating . . . . . . . . . . . . . . . . . ON
Cooling . . . . . . . . . . . . . . . . . OFF
Dry . . . . . . . . . . . . . . . . . . . . OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor
Fin temperature thermistor
Ambient temperature
thermistor
Outdoor heat exchanger tem-
perature thermistor
OBH629
5 seconds
ON
OFF
ON
OFF
<COOL>
ON
Compressor
OFF
ON
R.V.coil
OFF
ON
Outdoor fan
OFF
motor
Purpose
Protection
Cooling: Coil frost prevention
Heating: High pressure protec-
tion
Heating: Defrosting
Protection
Cooling: Low ambient tempera-
ture operation
Heating: Defrosting (Heater)
Cooling: Low ambient tempera-
ture operation
Cooling: High pressure protec-
tion
15 seconds
<HEAT>
5 seconds
Compressor LEV
○ ○
○
○ ○
○ ○
○
○ ○
○ ○
○ ○
27
5 seconds
Actuator
Outdoor fan Indoor fan
R.V.coil
motor motor
○ ○
○
○
○
○
Defrost
heater
○
○