Actuator Control - Mitsubishi Electric MUZ-FD25VABH - E1 Service Manual

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9

ACTUATOR CONTROL

MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH
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.
Compressor
R.V.coil
Outdoor fan
motor
9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
MUZ-FD25/35
Sensor
Discharge temperature thermistor
Indoor coil temperature thermistor
Defrost thermistor
Fin temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature thermistor
5 seconds
ON
OFF
ON
OFF
<COOL>
5 seconds
ON
OFF
ON
OFF
ON
OFF
Purpose
Protection
Cooling : Coil frost prevention
Heating : High pressure protection
Cooling : High pressure protection
Heating : Defrosting
Protection
Cooling : Low ambient temperature operation
Heating : Defrosting (Heater)
Low outside temperature operation
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15 seconds
<HEAT>
5 seconds
Actuator
Outdoor
Compressor LEV
fan motor
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Indoor fan Defrost
R.V.coil
motor heater
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