Mitsubishi MSZ-GA35VA Service Manual

SERVICE TECHNICAL GUIDECONTENTS1. MSZ-FA MICROPROCESSOR CONTROL ··········42. MSZ-GA MICROPROCESSOR CONTROL ·······223. MFZ MICROPROCESSOR CONTROL ···

10The air conditioner starts heat-ing operation approx. 3 minutesafter the vane has moved to thehorizontal position.• Sometimes the areaaround your fe

11(SWING)12 34 52. Vertical vane(1) Vane motor driveThese models are equipped with a stepping motor for the vertical vane. The rotating direction, spe

121-9. AREA ( ) SETTING(1) Press OPERATE / STOP (ON/ OFF)button to start the air conditioner.(2) Press i-see button. (NOTE 1)(3) Press AREA butto

13(4) AREA setting is cancelled when the "cancel" is sellected by pressing AREA button, or when WIDE VANE button is pressed.· Be sure

14PLASMA/WASH lampBlinkingNot lightedLightedWASH reset switchWASHresetE.O.SWEach time this b utton is pressed, the oper ation mode of PLASMA is chang

151-12. TIMER OPERATION1. How to set the timer(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.(2) Check that the current time is s

16EMERGENCY OPERATION switchWASHresetE.O.SWOperation mode COOL HEATSet temperature24:24:Fan speed Medium MediumHorizontal vane Auto AutoVertical vane

171-14. INVERTER SYSTEM CONTROL1-14-1. Inverter main power supply circuitPOWER P.C. BOARDPowersupplyINVERTER P.C. BOARDR64A R64BCTTR821DB65X64L62 L63C

184. Intelligent power module IPM consists of the following components · IGBT (x6) : Converts DC waveform to three-phase AC waveform and outp

19w The operation frequency in COOL mode is restricted the upper limit frequency after 1 hour as shown below for dew prevention.It is rated frequency

1. MSZ-FA MICROPROCESSOR CONTROL ···················································4MSZ-FA·VAIndoor unit models Outdoor unit modelsMSZ-FA25VA MUZ-F

201-16. EXPANSION VALVE CONTROL (LEV CONTROL)(1) Outline of LEV controlThe LEV basic control is comprised of setting LEV opening degree to the standar

21In COOL operation, the two indoor coil thermistors (one main and one sub) sense temperature ununiformity (superheat) at the heat exchanger, and when

22MSZ-GA MICROPROCESSOR CONTROL2Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP(ON/OFF) button

232. Indoor fan speed controlIndoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat’s OFF-ON.In AU

2. Indoor fan speed controlIndoor fan operates at the set speed by FAN SPEED CONTROL button.When thermostat OFF (compressor OFF) fan speed becomes Ver

253. High pressure protectionIn HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera-t

262-4. AUTO CHANGE OVER ··· AUTO MODE OPERATIONOnce desired temperature is set, unit operation is switched automatically between COOL and HEAT operati

27HighMed.LowSuper HighSuper HightimeRotational frequency2-5. INDOOR FAN MOTOR CONTROL(1) Rotational frequency feedback controlThe indoor fan motor is

28(4) VANE AUTO ( ) modeIn VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimumroom-temperatur

29<SWING operation>In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”.According to the

3. MFZ MICROPROCESSOR CONTROL ·······················································50MFZ-KA·VAIndoor unit models MFZ-KA25VAMFZ-KA35VAMFZ-KA50VA3-1.

30EMERGENCY OPERATION switchE.O.SWOperation mode COOL HEATSet temperature24:24:Fan speed Medium MediumHorizontal vane Auto AutoThe operation mode is i

312-10. INVERTER SYSTEM CONTROL2-10-1. Inverter main power supply circuitPOWER P.C. BOARDPowersupplyINVERTER P.C. BOARDR64A R64BCTTR821DB65X64L62 L63C

324. Intelligent power module IPM consists of the following components · IGBT (x6) : Converts DC waveform to three-phase AC waveform and outp

33w The operation frequency in COOL mode is restricted the upper limit frequency after 1 hour as shown below for dew prevention.It is rated frequency

342-12. EXPANSION VALVE CONTROL (LEV CONTROL) MSZ-GA35(1) Outline of LEV controlThe LEV basic control is comprised of setting LEV opening degree t

35In COOL operation, the two indoor coil thermistors (one main and one sub) sense temperature ununiformity (superheat) at the heat exchanger, and when

36WIRELESS REMOTE CONTROLLERON/OFFTOOCOOLTOOWARMLONGSignal transmitting sectionOperation display sectionOPERATE /STOP(ON /OFF)buttonTEMPERATURE button

37The system for dry operation uses the same refrigerant circuit as the cooling circuit.The compressor and the indoor fan are controlled by the room t

382. Indoor fan speed control (1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.In Auto the fan speed is as follows.Set temperature

393. High pressure protectionIn HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera-t

4MSZ-FA MICROPROCESSOR CONTROL1Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP(ON/OFF) button O

402-16. AUTO CHANGE OVER ··· AUTO MODE OPERATIONOnce desired temperature is set, unit operation is switched automatically between COOL and HEAT operat

41(3) PositioningThe vane presses to the vane stopper once to confirm the standard position and then moves to the set angle.Confirming of standard pos

42SWING operationIn swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”.According to the temperat

43612 34 5SWING2. Vertical vane(1) Vane motor driveThese models are equipped with a stepping motor for the vertical vane. The rotating direction, spee

442. CancelTIMER setting can be cancelled with ON/OFF TIMER buttons.To cancel ON timer, press ON-TIMER button ( ).To cancel OFF timer, press O

452-21. EMERGENCY / TEST OPERATIONIn case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoorunit.

46 4. Power transistor module IPM consists of the following components. · Power Transistors (x6): Converts DC waveform to three-phase AC waveform

47w The operation frequency in COOL mode is restricted the upper limit frequency after 1 hour as shown below for dew prevention.It is rated frequency

482-24. EXPANSION VALVE CONTROL (LEV CONTROL)(1) Outline of LEV controlThe LEV basic control is comprised of setting LEV opening degree to the standar

MUZ-GA71VA49In COOL operation, the two indoor coil thermistors (one main and one sub) sense temperature ununiformity (superheat) at the heat exchanger

52. Indoor fan speed controlIndoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat’s OFF-ON.In AUT

503MFZ MICROPROCESSOR CONTROLOnce the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP(ON/OFF) button ON.

512. Indoor fan speed controlIndoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat’s OFF-ON.In AU

521.7 :2.0 :Set temperatureDifference between roomtemperature and set tem-perature during operation1. Thermostat controlThermostat is ON or OFF by dif

533. High pressure protectionIn HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera-t

54Time chart of defrosting in HEAT mode (reverse type)set positionset speedset positionset speedIndoor fan (upper)Compressor normalOutdoor fanR.V. coi

55HighMed.LowSuper HighSuper HightimeRotational frequency3-5. INDOOR FAN MOTOR CONTROL(1) Rotational frequency feedback controlThe indoor fan motor is

56(4) VANE AUTO ( ) modeIn VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimumroom-temperatur

57 Set the air outlet selection switch to . Set the air outlet selection switch to .Air blows out automatically from the upper and lower air out-lets

58(11) ECONO COOL ( ) operation (ECONOmical operation)When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher

59Usage of i-save operation:1.Using as a low-energy modei-save operation can be used as a low-energy mode by setting the temperature 2–3: warmer than

62. Indoor fan speed control (1) Indoor fan operates at the set speed by FAN SPEED CONTROL button.In Auto the fan speed is as follows.Set temperature

60PROGRAM TIMER(Example 1) The current time is 8:00 PM.The unit turns off at 11:00 PM, and on at 6:00 AM.• The OFF timer and ON timer can be used in c

61EMERGENCY OPERATION switchE.O.SWOperation mode COOL HEATSet temperature24:24:Fan speed Medium MediumHorizontal vane Auto Auto• The following indicat

62MXZ MICROPROCESSOR CONTROL44-1. INVERTER SYSTEM CONTROL4-1-1. MXZ-2A52VA4-1-1-1. Inverter main power supply circuitPOWER P.C. BOARDPowersupplyINVERT

634. Intelligent power module IPM consists of the following components · IGBT (x6) : Converts DC waveform to three-phase AC waveform and out

64 SYMBOLIPMCB1~3CT1~2CT61LPFCR64A, R64BX64 NAMEINTELLIGENT POWER MODULE SMOOTHING CAPACITORCURRENT TRANSFORMERCURRENT TRANSF

65 4. Power transistor module IPM consists of the following components. · Power Transistors (x6): Converts DC waveform to three-phase AC waveform

664-2. EXPANSION VALVE CONTROL (LEV CONTROL)Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit.When

67The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode.wIn COOL mode, the two indoor coil thermistor (one main and

68Capacity codeIndoor unit capacity(kw)32.242.573.5105.0126.0137.1Standard opening (pulse)01 02 03 04 05 06 07 08COOLLEV Opening(code)HEAT126140130146

691 Discharge temperature 2 Each correction • (Each gas pipe temperature thermistor - Minimum gas pipe temperature thermistor)w 1 • (Main indoor co

7Time chart of defrosting in HEAT mode (reverse type)set positionset speedset positionset speedIndoor fanCompressor normalOutdoor fanR.V. coil (21S4)O

70Correct the LEV opening according to the difference between target discharge temperature and discharge temperature.Discharge temperature (:)LEV open

714-3. OPERATIONAL FREQUENCY RANGENumber ofoperatingunit1234Capacitycode1, 2, 3, 45, 67, 89, 1011, 1213, 1415 or above2, 3, 4, 5, 6, 78, 9, 1011, 12,

72Number ofoperatingunit1234Capacitycode1, 2, 3, 45, 67, 89, 1011, 1213, 1415 or above2, 3, 4, 5, 6, 78, 9, 1011, 12, 1314, 15, 1617, 18, 19, 20, 2122

73Fan speed is switched according to the number of operating indoor unit and the compressor frequency.Note•When the indoor coil thermistor is 57: or m

New publication, effective Jan. 2006Specifications subject to change without notice.CCCopyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTDDistribute

81-4. AUTO CHANGE OVER ··· AUTO MODE OPERATIONOnce desired temperature is set, unit operation is switched automatically between COOL and HEAT operatio

9(4) VANE AUTO ( ) modeIn VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimumroom-temperature