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Mitsubishi Electronics MUZ-FD09NA, MUZ-FD09NA- U1, MUZ-FD12NA, MUZ-FD12NA- U1 service manual ,

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8ACTUATOR CONTROL

MUZ-FD09NA MUZ-FD12NA

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.

ON

OFF

ON

OFF

Outdoor fan

motor

Compressor

5 seconds 15 seconds

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.

8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

Sensor Purpose

Actuator

Compressor

LEV Outdoor

fan motor R.V. coil Indoor fan

motor

Discharge temperature thermistor Protection ○○

Indoor coil temperature thermistor

Cooling : Coil frost prevention

○

Heating : High pressure protection

○○

Defrost thermistor

Cooling : High pressure protection

○○

Heating :

Defrosting ○○○○○

Fin temperature thermistor Protection ○○

Outdoor heat exchanger temperature thermistor

High pressure protection ○○○

Ambient temperature thermistor

Low ambient temperature operation

○○○

ON

OFF

Compressor

Outdoor fan

motor

R.V.coil ON

OFF

ON

OFF

<COOL>

5 seconds

<HEAT>

5 seconds

Contents

Main SERVICE MANUAL Wireless type Models MUZ-FD09NA MUZ-FD09NA- MUZ-FD12NA MUZ-FD12NA- OUTDOOR UNIT HFC Page Page 3SPECIFICATION Test condition 3, 4 (2) OPERATION OPERATING RANGE (1) POWER SUPPLY OUTLINES AND DIMENSIONS 4 8 in. or more Unit: inch REQUIRED SPACE Page 6REFRIGERANT SYSTEM DIAGRAM MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE ADDITIONAL REFRIGERANT CHARGE (R410A : oz.) DATA7 MUZ-FD09NA MUZ-FD12NA 7-2. PERFORMANCE CURVE Indoor intake air DB temperature (F) Cooling Indoor intake air WB temperature (F) Indoor intake air WB temperature (F) MUZ-FD12NA 14 20 25 30 35 40 45 50 55 60 6570 14 20 25 30 35 40 45 50 55 60 6570 MUZ-FD12NA 7-4. STANDARD OPERATION DATA 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY Input correction factors MUZ-FD12NA 7-6. TEST RUN OPERATION (How to operate fixed-frequency operation) 8ACTUATOR CONTROL SERVICE FUNCTIONS 9 9-1. CHANGE IN DEFROST SETTING MUZ-FD09VA MUZ-FD12VA 9-2. PRE-HEAT CONTROL SETTING 10-2. FAILURE MODE RECALL FUNCTION 1. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure 2. Flow chart of the detailed outdoor unit failure mode recall function 3. Outdoor unit failure mode table NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.). 10-3. TROUBLESHOOTING CHECK TABLE Page 10-4. TROUBLE CRITERION OF MAIN PARTS 10-5. TROUBLESHOOTING FLOW B Check of open phase A How to check inverter/compressor C Check of compressor F Check of compressor start failure D Check of compressor winding E Check of compressor operation time G Check of outdoor thermistors H Check of R.V. coil Unit operates HEAT mode even if it is set to COOL mode. Unit operates COOL mode even if it is set to HEAT mode. I Check of outdoor fan motor J Check of power supply K Check of LEV (Expansion valve) L Check of inverter P.C. board M How to check miswiring and serial signal error N Electromagnetic noise enters into TV sets or radios 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board 11-1. MUZ-FD09NA MUZ-FD12NA 1. Removing the cabinet Photo 1 11 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> 2. Removing the inverter assembly, inverter P.C. board 3. Removing R.V. coil Photo 5 Photo 3 Photo 4 (Inverter assembly) 5. Removing outdoor fan motor 6. Removing the compressor and 4-way valve Photo 8 NOTE: Photo 6