Actuator Control; Outdoor Fan Motor Control; R.v. Coil Control; Relation Between Main Sensor And Actuator - Mitsubishi Electric MUZ-FH09NA Service Manual

8

ACTUATOR CONTROL

MUZ-FH09NA MUZ-FH09NAH MUZ-FH12NA MUZ-FH12NAH MUZ-FH15NA MUZ-FH15NAH

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

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

8-3. 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
*. MUZ-FH•NAH only.
OBH584A
5 seconds
ON
OFF
ON
OFF
<COOL>
5 seconds
ON
OFF
ON
OFF
ON
OFF
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
Outdoor fan
Compressor LEV
motor
○ ○
○
○ ○
○ ○
○
○ ○
○ ○
○ ○
21
Actuator
Indoor fan
R.V.coil
motor
○ ○ ○
○
○
○
○
Defrost
heater *
○