Actuator Control; Outdoor Fan Motor Control - Mitsubishi Electric MUZ-GL12NA Service Manual

8

ACTUATOR CONTROL

MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA

8-1. 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
8-2. R.V. COIL CONTROL (MUZ)
Heating . . . . . . . . . . . . . . . . . ON
Cooling . . . . . . . . . . . . . . . . . OFF
Dry . . . . . . . . . . . . . . . . . . . . OFF
NOTE: The 4-way valve reverses for 5 seconds right before startup of the compressor.
Compressor
R.V.coil
Outdoor fan
motor
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor (MUZ)
Fin temperature thermistor
Ambient temperature
thermistor
Outdoor heat exchanger tem-
perature thermistor
*. MUZ-GL•NAH only.
OBH733J
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
Heating: Defrosting
Protection
Cooling: Low ambient temperature operation
Heating: Defrosting (Heater)
Cooling: Low ambient temperature operation
Cooling: High pressure protection
15 seconds
<HEAT>
5 seconds
LEV Outdoor fan
Compressor
○ ○
○
○ ○
○ ○
○
○ ○
○ ○
○ ○
39
Actuator
R.V.coil Indoor fan
motor motor
○ ○ ○
○
○
○
○
Defrost
heater *
○