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Mitsubishi Electric MSC-CA20VB Service Technical Manual

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SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
FLOOR AND CEILING TYPE AIR CONDITIONERS
FLOOR TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE TECHNICAL GUIDE
Wireless type Models
MSC-CA•VB -
MSC-CB•VB -
MSC-GA•VB -
Multi system type Models
Wireless type Models
MS-GA•VB -
E
MSH-CA•VB -
MSH-CB•VB -
MSH-GA•VB -
MSZ-CA•VB -
MSZ-FA•VA -
E
MSZ-GA•VA -
MSZ-CB•VA -
MSZ-HA•VA -
MSZ-GB•VA -
Inverter-controlled multi system type Models
Wireless type Models
MCF-GA • VB -
MCFH-GA • VB -
MFZ-KA • VA -
E
E
E
E
E
E
E
E
E
E
E
E
E
E
Revision D:
• MXZ-5A100VA -
Please void OBT06 REVISED EDITION-C.
· MU-GA•VB -
E
· MUH-GA•VB -
· MUX-A•VB -
E
· MU-GA•VB -
E
· MUH-GA•VB -
· MUZ-CA•VB -
· MUZ-FA•VA -
E
· MUZ-FA•VAH -
· MUZ-GA•VA -
· MUZ-GA•VAH -
· MUZ-HA•VA -
· MUZ-GB•VA -
· MXZ-A•VA -
E
· MUCF-GA•VB -
· MUCFH-GA•VB -
CONTENTS
1. MSC MICROPROCESSOR CONTROL················6
2. MS MICROPROCESSOR CONTROL ················15
3. MSH MICROPROCESSOR CONTROL··············26
4. MSZ-CA MICROPROCESSOR CONTROL········39
5. MSZ-FA MICROPROCESSOR CONTROL ········54
6. MSZ-GA, MSZ-CB
MICROPROCESSOR CONTROL ············72
7. MCF MICROPROCESSOR CONTROL············100
8. MCFH MICROPROCESSOR CONTROL ·········106
9. MFZ MICROPROCESSOR CONTROL ············115
10. MSZ-HA MICROPROCESSOR CONTROL·····127
11. MSZ-GB MICROPROCESSOR CONTROL·····137
12. MXZ MICROPROCESSOR CONTROL ···········150
has been added.
E
No. OBT06
REVISED EDITION-D
E
E
E
E
E
E
E
E
E
E

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Summary of Contents for Mitsubishi Electric MSC-CA20VB

  • Page 1 Revision D: • MXZ-5A100VA - has been added. SPLIT-TYPE, AIR CONDITIONERS Please void OBT06 REVISED EDITION-C. SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS FLOOR AND CEILING TYPE AIR CONDITIONERS FLOOR TYPE, HEAT PUMP AIR CONDITIONERS No. OBT06 REVISED EDITION-D SERVICE TECHNICAL GUIDE Wireless type Models MSC-CA•VB - ·...

  • Page 2: Table Of Contents

    Revision A: • MFZ-KA•VA - has been added. 1. MSC MICROPROCESSOR CONTROL·························································6 Indoor unit models Outdoor unit models MSC-CA20VB MSC-CB20VB MSC-GA20VB MU-GA20VB MUH-GA20VB MUX-2A28VB MSC-CA25VB MSC-CB25VB MSC-GA25VB MU-GA25VB MUH-GA25VB MUX-2A59VB MSC-CA35VB MSC-CB35VB MSC-GA35VB MU-GA35VB MUH-GA35VB MUX-3A60VB MUX-2A70VB MUX-3A63VB MUX-4A73VB 1-1. COOL OPERATION················································································6 1-2.
  • Page 3 4. MSZ-CA MICROPROCESSOR CONTROL ·················································39 Indoor unit models Outdoor unit models MSZ-CA25VB MUZ-CA25VB MSZ-CA35VB MUZ-CA35VB 4-1. “I FEEL CONTROL” OPERATION ·····················································39 4-2. AUTO CHANGE OVER ··· AUTO MODE OPERATION······················44 4-3. COOL OPERATION·············································································45 4-4. DRY OPERATION ···············································································45 4-5. HEAT OPERATION ·············································································45 4-6.
  • Page 4 Indoor unit models Outdoor unit models MSZ-GA50VA MUZ-GA50VA MSZ-GA60VA MUZ-GA60VA MSZ-GA71VA MUZ-GA71VA 6-13. COOL OPERATION ············································································86 6-14. DRY OPERATION ···············································································87 6-15. HEAT OPERATION ·············································································88 6-16. AUTO CHANGE OVER ··· AUTO MODE OPERATION ·····················90 6-17. INDOOR FAN MOTOR CONTROL·····················································90 6-18. OUTDOOR FAN MOTOR CONTROL·················································91 6-19.
  • Page 5 10. MSZ-HA MICROPROCESSOR CONTROL ·············································127 Indoor unit models Outdoor unit models MSZ-HA25VA MUZ-HA25VA MSZ-HA35VA MUZ-HA35VA 10-1. COOL OPERATION·········································································128 10-2. DRY OPERATION ···········································································128 10-3. HEAT OPERATION ·········································································129 10-4. INDOOR FAN MOTOR CONTROL ·················································130 10-5. AUTO VANE OPERATION ······························································131 10-6. TIMER OPERATION········································································133 10-7.

  • Page 6: Msc Microprocessor Control

    MSC MICROPROCESSOR CONTROL MSC-CA20VB MSC-CB20VB MSC-GA20VB MU-GA20VB MUH-GA20VB MUX-2A28VB MUX-3A63VB MSC-CA25VB MSC-CB25VB MSC-GA20VB MU-GA25VB MUH-GA25VB MUX-2A59VB MUX-2A70VB MSC-CA35VB MSC-CB35VB MSC-GA35VB MU-GA35VB MUH-GA35VB MUX-3A60VB MUX-4A73VB Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP (ON/OFF) but- ton ON.

  • Page 7: Dry Operation

    3. Coil frost prevention Temperature control When the indoor coil thermistor RT12 reads 4°C or below(MSC-CA20/CA25/CB20/CB25/GA20/GA25VB) / 0°C or below(MSC-CA35/CB35/GA35VB) for 5 minutes, the coil frost prevention mode starts. The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if RT12 still reads below 4°C (MSC-CA20/CA25/CB20/CB25/GA20/GA25VB) / 0°C (MSC-CA35/CB35/GA35VB), this mode is prolonged until RT12 reads over 4°C (MSC-CA20/CA25/CB20/CB25/GA20/GA25VB) / 0°C (MSC- CA35/CB35/GA35VB).

  • Page 8: Fan Operation

    Operation time chart Example Thermostat Indoor fan Outdoor fan Compressor 8 minutes 3 minutes 4 minutes 1 minute 4. Coil frost prevention The operation is as same as coil frost prevention during COOL operation.(Refer to 1-1.3.) However when coil frost prevention works while the indoor fan is OFF, its speed becomes set speed. <...

  • Page 9: 1-5."I Feel Control" Operation

    (3) Warm air control When the following any conditions of 1 (a. ~ c.) and the condition of 2 are satisfied at the same time, warm air control works. 1 a.) When outdoor unit starts operating in HEAT mode. b.) When cold air prevention has been released. c.) When defrosting has been finished 2 When the temperature of indoor coil thermistor RT12 is less than 37°C.
  • Page 10 (4) The initial set temperature is decided by the initial room temperature. Initial room temperature Mode Initial set temperature MU & MUX type MUH type 26: or more 26: or more COOL mode of "I FEEL CONTROL" Initial room temperature 25: or more, 25: or more, less than 26:...

  • Page 11: Indoor Fan Motor Control

    1-6. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High,Med.,Low), the microprocessor controls SR141 and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.

  • Page 12: Timer Operation

    < > (7) Cold air prevention in HEAT operation MUH-GA20/GA25/GA35VB When any of the following conditions occurs in HEAT operation, the horizontal vane angle changes to Angle 1 automat- ically to prevent cold air blowing on users. Compressor is not operating. Defrosting is performed.

  • Page 13: Emergency / Test Operation

    (4) Press HR. and MIN. button to set the timer. Time setting is 10-minute units. HR. and MIN. button will work when “ ” or “ ” mark is flashing. These marks disappear in 1 minute. After setting ON timer, check that OPERATION INDICATOR lamp of the indoor unit lights. NOTE1 : Be sure to place the remote controller at the position where its signal can reach the air conditioner even during TIMER operation, or the set time may deviate within the range of about 10 minutes.

  • Page 14: Outdoor Unit Actuator Control

    1-10. OUTDOOR UNIT ACTUATOR CONTROL MUX-2A28VB MUX-2A59VB MUX-2A70VB INDOOR UNIT INDOOR UNIT ACTUATOR ACTUATOR – COMPRE- COMPRE- – SSOR SSOR – – ANY UNIT ON ANY UNIT ON OUTDOOR OUTDOOR MF61 FAN MOTOR FAN MOTOR ON (CLOSE) MUX-4A73VB (BALANCE) INDOOR UNIT SOLENOID ACTUATOR OFF (OPEN)

  • Page 15: Ms Microprocessor Control

    MS MICROPROCESSOR CONTROL MS-GA50VB MU-GA50VB MS-GA60VB MU-GA60VB MS-GA80VB MU-GA80VB WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/ STOP (ON/ OFF) button ON/OFF WARM COOL TEMPERATURE buttons CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button (Horizontal vane button) STOP I FEEL COOL OFF-TIMER button...
  • Page 16 • Once the mode is fixed, the mode does not change by room temperature afterwards. • Under the ON-TIMER ( ) operation, mode is determined as follows. When the system is stopped on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature.
  • Page 17 2-1-1. COOL mode of “I FEEL CONTROL” 1. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. Difference between room In AUTO the fan speed is as follows. temperature and set temperature during operation Initial temperature difference Fan Speed Room temperature minus set temperature : 1.7 °C or more···································High...

  • Page 18: Cool Operation

    2-1-2. DRY mode of “I FEEL CONTROL” The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease. 1.

  • Page 19: Dry Operation

    2-3. DRY ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room tempera- ture and determines the set temperature. Set temperature is as shown on the right chart.
  • Page 20 (3) Positioning The vane presses the vane stopper once to confirm the standard position and then moves to the set angle. Confirming of standard position is performed in case of follows. (a) When the power supply turns ON. (b) When the operation starts or finishes (including timer operation). (c) When the test run starts.
  • Page 21 (8) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(Tp (w 1) SWING operation makes you feel cooler than set temperature.

  • Page 22: Timer Operation

    2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE button. SWING (3) Positioning The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.

  • Page 23: Emergency / Test Operation

    PROGRAM TIMER • OFF timer and ON timer can be used in combination. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM. (Example 2) The current time is 11:00 AM. The unit turns off at 11:00 PM, and on at 6:00 AM.

  • Page 24: Expansion Valve Control (Lev Control)

    2-9. EXPANSION VALVE CONTROL (LEV CONTROL) <MU-GA80VB> LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse 30 ~ 90 pulse / second Drive speed Opening set The setting is always in opening direction.

  • Page 25: Function Of Soft Start Relay

    2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub) RT13 in the indoor unit is 2: or more for a fixed time at cool or dry operation, the target discharge temperature is changed.

  • Page 26: Msh Microprocessor Control

    MSH MICROPROCESSOR CONTROL MSH-CA50VB MSH-GA50VB MUH-GA50VB MSH-CB50VB MSH-GA60VB MUH-GA60VB MSH-GA80VB MUH-GA80VB WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE /STOP (ON /OFF) button ON/OFF WARM COOL TEMPERATURE buttons CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button STOP (Horizontal vane button) I FEEL COOL...
  • Page 27 • Once the mode is fixed, the mode does not change by room temperature afterwards. • Under ON-TIMER ( ) operation, mode is determined as follows. When the system is stopped on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature.
  • Page 28 3-1-1. COOL mode of “I FEEL CONTROL” 1. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. Difference between room In AUTO the fan speed is as follows. temperature and set temperature Initial temperature difference Fan Speed during operation Room temperature minus set temperature : 1.7 : or more····································High...
  • Page 29 3-1-2. DRY mode of “I FEEL CONTROL” The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease. 1.
  • Page 30 (2) Cold air prevention control The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 22°C. The fan operates Low when the temperature of indoor coil thermistor RT12 is below 18°C. But the fan stops when the indoor fan operates at Very Low and the room temperature is 15°C or less.
  • Page 31 <MUH-GA80VB> During heating operation, the outdoor fan and the compressor are controlled by the temperature of indoor coil thermistor RT12 for excess rise protection of compressor discharge pressure. • Outdoor fan When the temperature of indoor coil thermistor RT12 goes to 55: or more, the outdoor fan is turned OFF. When the temperature of indoor coil thermistor RT12 becomes to 52: or less, the outdoor fan is turned ON.

  • Page 32: Cool Operation

    3-2. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons. (TOO WARM or TOO COOL button) to select the desired temperature.

  • Page 33: Auto Vane Operation

    3-6. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing the VANE button.
  • Page 34 (9) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(Tp (w 1) SWING operation makes you feel cooler than set temperature.

  • Page 35: Timer Operation

    2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing the WIDE VANE button. SWING (3) Positioning The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.

  • Page 36: Emergency / Test Operation

    2. Cancel TIMER setting can be cancelled with the ON/OFF TIMER buttons. To cancel ON timer, press “ON-TIMER” button. To cancel OFF timer, press “OFF-TIMER” button. TIMER is cancelled and the display of set time disappears. PROGRAM TIMER • OFF timer and ON timer can be used in combination. •...

  • Page 37: Expansion Valve Control (Lev Control)

    3-9. EXPANSION VALVE CONTROL (LEV CONTROL) <MUH-GA80VB> LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse 30 ~ 90 pulse / second Drive speed Opening set The setting is always in opening direction.

  • Page 38: Function Of Soft Start Relay

    2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub) RT13 in the indoor unit is 2: or more for a fixed time at cool or dry operation, the target discharge temperature is changed.

  • Page 39: Msz-Ca Microprocessor Control

    MSZ-CA MICROPROCESSOR CONTROL MSZ-CA25VB MUZ-CA25VB MSZ-CA35VB MUZ-CA35VB WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE /STOP (ON /OFF) button ON/OFF WARM COOL TEMPERATURE buttons Indication of remote controller model is on back ˚C CLOCK AM PM ON/OFF WARM COOL FAN SPEED CONTROL button VANE CONTROL button...
  • Page 40 • Once the mode is fixed, the mode does not change by room temperature afterwards. • Under ON-TIMER ( ) operation, mode is determined as follows. When the system is stopped on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature.
  • Page 41 4-1-1. COOL mode of “I FEEL CONTROL” Difference between room temperature and set temper- 1. Thermostat control ature during operation. Thermostat is ON or OFF by difference between room temperature and set temperature Initial temperature difference Thermostat Set temperature Room temperature minus set temperature : 0.3 : or more················································ON Room temperature minus set temperature : less than -0.3 :············································OFF -0.3 2.
  • Page 42 4-1-2. DRY mode of “I FEEL CONTROL” The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease. Difference between room temperature and set tem- 1.
  • Page 43 (3) Warm air control When the following conditions of a) ~ b) are satisfied, warm air control works. a) when cold air prevention has been released after the compressor started operation b) when defrosting has been finished When warm air control works, the fan speed changes from Low as follows to blow out warm air gradually. When every 2 minutes have passed (1) if the temperature of RT12 is 22°C or more, the indoor fan speed is up by 1 step.

  • Page 44: Auto Change Over

    Time chart of defrosting in HEAT mode (reverse type) <indoor unit> horizontal set position set position Horizontal vane Indoor fan Very Low (temperature of indoor coil thermistor > 18:) set speed set speed seconds <outdoor unit> Maximum frequency Compressor normal seconds seconds seconds...

  • Page 45: Cool Operation

    4-3. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C 1.

  • Page 46: Indoor Fan Motor Control

    4-6. INDOOR FAN MOTOR CONTROL 1. Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feed- back the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High, Med.,Low) the microprocessor controls SR141 and adjusts fan motor electric current to make the current rotational fre- quency close to the target rotational frequency.

  • Page 47: Timer Operation

    (7) SWING MODE ( By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. The remote controller displays “ ” . SWING mode is cancelled when VANE CONTROL button is pressed once again. (8) Cold air prevention in HEAT operation. When any of the following conditions occurs in HEAT operation, the vane angle changes to Angle 1 automatically to pre- vent cold air blowing on users.

  • Page 48: Emergency / Test Operation

    NOTE1 : Be sure to place the remote controller at the position where its signal can reach the air conditioner even during TIMER operation, or the set time may deviate within the range of about 10 minutes. NOTE2 : Reset the timer in the following cases, or the set time may deviate and other malfunctions may occur. A power failure occurs.

  • Page 49: Inverter System Control

    4-10. INVERTER SYSTEM CONTROL 4-10-1. Inverter main power supply circuit POWER P.C. BOARD INVERTER P.C. BOARD DB61 Power R64A R64B C62A supply CT761 C62B C61B CT781 TR821 DB65 Booster chopper circucuit Function of main parts SYMBOL NAME FUNCTION It supplies three-phase AC power to compressor. INTELLIGENT POWER MODULE It stabilizes the DC voltage.
  • Page 50 3. Purpose of PAM adoption PAM : Pulse Amplitude Modulation PAM has been adopted for the efficiency improvement and the adaptation to IEC harmonic current emission standard. Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor.

  • Page 51: Operation Frequency Control Of Outdoor Unit

    4-10-4. Characteristics of sine wave control in case of brushless DC motor Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. This control provides the most efficient waveform corresponding to the rotation times of compressor motor. The rotation can be set to higher compared to the conventional motor drive system.

  • Page 52: Expansion Valve Control (Lev Control)

    4-12. EXPANSION VALVE CONTROL (LEV CONTROL) (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance.
  • Page 53 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON Positioning Opening degree is corrected according to discharge Standard Commanded temperature. opening to open degree about 15 minutes Time OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT :) Applied model MUZ-CA25VB...

  • Page 54: Msz-Fa Microprocessor Control

    MSZ-FA MICROPROCESSOR CONTROL MSZ-FA25VA MUZ-FA25VA MUZ-FA25VAH MSZ-FA35VA MUZ-FA35VA MUZ-FA35VAH WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of remote controller model (This diagram shows an overall view.) (This diagram shows an overall view.) WIDE VANE button (Vertical vane button) FAN SPEED CONTROL button...

  • Page 55: Cool Operation

    5-1. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. POWER lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper-...

  • Page 56: Dry Operation

    5-2. DRY ( ) OPERATION Set temperature and initial room temperature in dry mode (1) Press OPERATE/STOP(ON/OFF) button. POWER lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature.
  • Page 57 3. High pressure protection In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera- tional frequency is controlled to prevent the condensing pressure from increasing excessively. 4. Overload starting When the room temperature thermistor RT11 reads 18°C or more, the compressor runs with its maximum frequency regulat- ed for 10 minutes after the start-up.

  • Page 58: Auto Change Over

    Time chart of defrosting in HEAT mode (reverse type) <indoor unit> horizontal set position set position Horizontal vane Indoor fan Very Low (temperature of indoor coil thermistor > 18:) set speed set speed seconds <outdoor unit> Maximum frequency Compressor normal seconds seconds seconds...

  • Page 59: Indoor Fan Motor Control

    5-5. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (Super High, High, Med., Low), the microprocessor adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
  • Page 60 (4) VANE AUTO ( ) mode The microprocessor automatically determines the vane angle and operation to make the optimum room temperature dis- tribution. COOL and DRY operation HEAT operation Vane angle is fixed to Horizontal position. Vane angle is fixed to Angle 4. Horizontal position (5) STOP (operation OFF) and ON-TIMER standby...

  • Page 61: I-See Control Operation

    (10) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12). SWING operation makes you feel cooler than set temperature.

  • Page 62: Area Setting

    i-see Sensor i-see Sensor, which is installed on the right side of the air outlet of the indoor unit, is moved with the stepping motor and it detects the floor/ wall temperature. Enlarged view of i-see Sensor i-see Sensor is installed here. i-see Sensor ·...
  • Page 63 (4) AREA setting is cancelled when the "cancel" is sellected by pressing AREA button, or when WIDE VANE button is pressed. Indoor unit installation location and air-conditioning area Installed at left Installed at center Installed at right LEFT RIGHT LEFT RIGHT LEFT RIGHT...

  • Page 64: Plasma Duo Operation

    5-10. PLASMA DUO ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. PLASMA/WASH lamp (2) Press PLASMA button to set PLASMA DUO operation. Each time this b utton is pressed, the oper ation mode of PLASMA is changed in sequence: Lighted Cancel (The sign of PLASMA oper ation disappears .)

  • Page 65: Auto Front Panel

    5-11. AUTO FRONT PANEL When the unit starts operating, the front panel opens automatically to draw in air. When the unit stops operating, the front panel closes automatically. Open Closed Operation and operating range of the auto front panel The front panel fully opens 10 mm or more upper than the level line of the top end of the nozzle assembly. It takes about 13 seconds to open the front panel completely.

  • Page 66: Emergency / Test Operation

    PROGRAM TIMER • The OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first. • “ ” and “ ” display shows the order of the OFF timer and the ON timer operation. (Example 1) The current time is 8:00 PM.

  • Page 67: Inverter System Control

    5-14. INVERTER SYSTEM CONTROL 5-14-1. Inverter main power supply circuit POWER P.C. BOARD INVERTER P.C. BOARD DB61 Power R64A R64B C63A CT761 supply C63B C63C CT781 TR821 DB65 Booster chopper circucuit Function of main parts SYMBOL NAME FUNCTION It supplies three-phase AC power to compressor. INTELLIGENT POWER MODULE It stabilizes the DC voltage.
  • Page 68 3. Purpose of PAM adoption PAM : Pulse Amplitude Modulation PAM has been adopted for the efficiency improvement and the adaptation to IEC harmonic current emission standard. Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor.

  • Page 69: Operational Frequency Control Of Outdoor Unit

    5-14-3. Characteristics of sine wave control in case of brushless DC motor Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. This control provides the most efficient waveform corresponding to the rotation times of compressor motor. The rotation can be set to higher compared to the conventional motor drive system.

  • Page 70: Expansion Valve Control (Lev Control)

    5-16. EXPANSION VALVE CONTROL (LEV CONTROL) (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance.
  • Page 71 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON Positioning Opening degree is corrected according to discharge Standard Commanded temperature. opening to open degree about 5 minutes <COOL, DRY> Time about 15 minutes <HEAT> OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT :) MUZ-FA25VA...

  • Page 72: Msz-Ga, Msz-Cb Microprocessor Control

    MSZ-GA • MSZ-CB MICROPROCESSOR CONTROL MSZ-GA22VA MSZ-CB22VA MSZ-GA25VA MSZ-CB25VA MUZ-GA25VA MUZ-GA25VAH MSZ-GA35VA MSZ-CB35VA MUZ-GA35VA MUZ-GA35VAH WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of remote controller model is on back (This diagram shows an overall view.) FAN SPEED CONTROL button OFF-TIMER button OPERATION SELECT button...

  • Page 73: Cool Operation

    6-1. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper-...

  • Page 74: Dry Operation

    Set temperature and 6-2. DRY ( ) OPERATION initial room temperature in dry mode (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature.
  • Page 75 3. High pressure protection In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera- tional frequency is controlled to prevent the condensing pressure from increasing excessively. 4. Overload starting When the room temperature thermistor RT11 reads 18°C or more, the compressor runs with its maximum frequency regulat- ed for 10 minutes after the start-up.

  • Page 76: Auto Change Over

    Time chart of defrosting in HEAT mode (reverse type) <indoor unit> horizontal set position set position Horizontal vane Indoor fan Very Low (temperature of indoor coil thermistor > 18:) set speed set speed seconds <outdoor unit> Maximum frequency Compressor normal seconds seconds seconds...

  • Page 77: Indoor Fan Motor Control

    6-5. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (Super High, High, Med., Low), the microprocessor adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
  • Page 78 (4) VANE AUTO ( ) mode The microprocessor automatically determines the vane angle and operation to make the optimum room temperature dis- tribution. HEAT operation COOL and DRY operation Vane angle is fixed to Horizontal position. Vane angle is fixed to Angle 4. Horizontal position (5) STOP (operation OFF) and ON-TIMER standby...

  • Page 79: Timer Operation

    (10) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12). SWING operation makes you feel cooler than set temperature.

  • Page 80: Emergency/Test Operation

    PROGRAM TIMER • OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM.

  • Page 81: Inverter System Control

    6-10. INVERTER SYSTEM CONTROL 6-10-1. Inverter main power supply circuit POWER P.C. BOARD INVERTER P.C. BOARD DB61 Power R64A R64B C63A CT761 supply C63B C63C CT781 TR821 DB65 Booster chopper circucuit Function of main parts SYMBOL NAME FUNCTION It supplies three-phase AC power to compressor. INTELLIGENT POWER MODULE It stabilizes the DC voltage.
  • Page 82 3. Purpose of PAM adoption PAM : Pulse Amplitude Modulation PAM has been adopted for the efficiency improvement and the adaptation to IEC harmonic current emission standard. Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor.

  • Page 83: Operational Frequency Control Of Outdoor Unit

    6-10-3. Characteristics of sine wave control in case of brushless DC motor Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. This control provides the most efficient waveform corresponding to the rotation times of compressor motor. The rotation can be set to higher compared to the conventional motor drive system.

  • Page 84: Expansion Valve Control (Lev Control)

    6-12. EXPANSION VALVE CONTROL (LEV CONTROL) MUZ-GA35 (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance.
  • Page 85 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON Positioning Opening degree is corrected according to discharge Standard Commanded temperature. opening to open degree about 5 minutes <COOL, DRY> Time about 15 minutes <HEAT> OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT :) Applied model...

  • Page 86: Msz-Ga50Va Muz-Ga50Va

    MSZ-GA50VA MUZ-GA50VA MSZ-GA60VA MUZ-GA60VA MSZ-GA71VA MUZ-GA71VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button ON/OFF WARM COOL TEMPERATURE buttons Indication of remote controller model is on back. WIDE VANE button (Vertical vane button) FAN SPEED CONTROL button OFF-TIMER button OPERATION SELECT button ON-TIMER button...

  • Page 87: Dry Operation

    2. Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button Difference between room regardless of the thermostat’s OFF-ON. temperature and set tempera- In AUTO the fan speed is as follows. ture during operation Initial temperature difference Fan speed Room temperature minus set temperature : 1.7 : or more ········································High...

  • Page 88: Heat Operation

    Difference between room temperature and set tem- 1. Thermostat control perature during operation Thermostat is ON or OFF by difference between room temperature and set temperature. Initial temperature difference Thermostat Set temperature Room temperature minus set temperature : -1.0 : or more··············································ON Room temperature minus set temperature : less than -1.0 :············································OFF -1.0 -0.7...
  • Page 89 3. High pressure protection In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera- tional frequency is controlled to prevent the condensing pressure from increasing excessively. 4. Overload starting When the room temperature thermistor RT11 reads 18°C or more, the compressor runs with its maximum frequency regulat- ed for 10 minutes after the start-up.

  • Page 90: Auto Change Over

    6-16. AUTO CHANGE OVER ··· AUTO MODE OPERATION Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation. 1. Mode selection (1) Initial mode At first indoor unit operates only indoor fan with outdoor unit OFF for 3 minutes to detect present room temperature. Following the conditions below, operation mode is selected.

  • Page 91: Outdoor Fan Motor Control

    6-18. OUTDOOR FAN MOTOR CONTROL Fan speed is switched according to the compressor frequency. Fan speed Down High Min. Compressor frequency Max. <Relation between compressor frequency and fan speed> Compressor frequency Mode Fan speed MUZ-GA50/GA60 MUZ-GA71 44Hz 54Hz COOL Down 33Hz 39Hz 44Hz...
  • Page 92 (7) SWING MODE ( By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. The remote controller displays “ ” . SWING mode is cancelled when VANE CONTROL button is pressed once again. (8) Cold air prevention in HEAT operation When any of the following conditions occurs in HEAT operation, the vane angle changes to Horizontal position automati- cally to prevent cold air blowing on users.
  • Page 93 (10) LONG MODE ( By pressing LONG button indoor fan speed becomes faster than setting fan speed on the remote controller, and the hor- izontal vane moves to the position for LONG mode. The remote controller displays “ ”. LONG mode is cancelled when LONG button is pressed once again or VANE button is pressed or ECONO COOL button is pressed in COOL mode.

  • Page 94: Timer Operation

    6-20. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button.

  • Page 95: Emergency/Test Operation

    6-21. EMERGENCY / TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote con- troller run down.
  • Page 96 6-22-2. Outline of main power supply circuit 1. At the start of operation Main power supply circuit is formed when X64 (Relay) is turned ON at compressor startup. To prevent rush current from running into the circuit when power supply is turned ON, R64A and R64B (Current-limiting resistor) are placed in sub circuit.

  • Page 97: Operational Frequency Control Of Outdoor Unit

    6-22-4. Characteristics of sine wave control in case of brushless DC motor Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. This control provides the most efficient waveform corresponding to the rotation times of compressor motor. The rotation can be set to higher compared to the conventional motor drive system.

  • Page 98: Expansion Valve Control (Lev Control)

    6-24. EXPANSION VALVE CONTROL (LEV CONTROL) (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance.
  • Page 99 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON Positioning Opening degree is corrected according to discharge Standard Commanded temperature. opening to open degree about 5 minutes <COOL, DRY> Time about 15 minutes <HEAT> OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT :) Applied model...

  • Page 100: Mcf Microprocessor Control

    MCF MICROPROCESSOR CONTROL MCF-GA35VB MUCF-GA35VB MCF-GA50VB MUCF-GA50VB MCF-GA60VB MUCF-GA60VB Once the operation mode is set, the same operation mode WIRELESS REMOTE CONTROLLER can be repeated by simply turning OPERATE/STOP (ON/OFF) Signal transmitting section button ON. Indoor unit receives the signal with a beep tone. When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart Operation display section...
  • Page 101 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 26°C or more 24°C COOL mode of “I FEEL CONTROL” Initial room temperature 25°C to 26°C minus 2°C Initial room temperature DRY mode of 13°C to 25°C minus 2°C...
  • Page 102 Time control When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes. The indoor fan operates at set speed. a. Compressor has been continuously operating. b. Indoor fan speed is Low or Med. c.

  • Page 103: Cool Operation

    7-2. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons. (TOO WARM or TOO COOL button) The setting range is 16 ~ 31°C.
  • Page 104 (4) VANE AUTO ( ) mode The microprocessor automatically determines the vane angle and operation to make the optimum room temperature distri- bution. COOL and DRY operation FAN operation Vane angle is fixed to Angle 1. Vane angle is fixed to Angle 4. (5) STOP and ON-TIMER standby When the following cases occur, the vane returns to the closed position.

  • Page 105: Timer Operation

    7-6. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP(ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button.

  • Page 106: Mcfh Microprocessor Control

    MCFH MICROPROCESSOR CONTROL MCFH-GA35VB MUCFH-GA35VB MCFH-GA50VB MUCFH-GA50VB MCFH-GA60VB MUCFH-GA60VB Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP WIRELESS REMOTE CONTROLLER (ON/OFF) button ON. Indoor unit receives the signal with a beep tone. Signal transmitting section When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not...
  • Page 107 (4) The initial set temperature is decided by the initial room temperature. Initial room temperature Initial set temperature Model 26: or more COOL mode of "I FEEL CONTROL" Initial room temperature 25: to 26: minus 2: Initial room temperature DRY mode of 23: to 25: "I FEEL CONTROL"...
  • Page 108 When compressor stops, the accumulated time is cancelled and when compressor restarts, time counting starts from the beginning. Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 26°C. However, when two of the above conditions (b. and c.) are satisfied again, time accumulation is resumed. Operation chart Example Compressor...
  • Page 109 2. Indoor fan speed control Difference between room (1) In AUTO the fan speed is as follows. temperature and set temperature Initial temperature difference Fan speed during operation Set temperature minus room temperature: 2 °C or more ····································High Set temperature minus room temperature: Between 1 and 2 °C ························Med. Set temperature minus room temperature: less than 1 °C ··································Low 1.7: (2) Cold air prevention control...

  • Page 110: Cool Operation

    4. Defrosting Defrosting of outdoor heat exchanger is controlled by DEICER P.C. board, with detection by the defrost thermistor RT61. (1) Starting conditions of defrost When all conditions of a) ~ c) are satisfied, the defrosting operation starts. a) The compressor cumulative operation time exceeds 40 minutes without the defrosting operation working. b) The defrost thermistor RT61 reads - 3°C or less.

  • Page 111: Dry Operation

    Set temperature and initial room temperature in DRY mode 8-3. DRY ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature.
  • Page 112 (5) STOP (operation OFF) and ON-TIMER standby When the following cases occur, the vane returns to the closed position. (a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF). (b) When the operation is stopped by the emergency operation. (c) When ON-TIMER is on standby. (6) Dew prevention During COOL or DRY operation at Angle 4 or 5 when the compressor cumulative operation time exceeds 1 hour, the angle of horizontal vane automatically changes to Angle 1 for dew prevention.

  • Page 113: Timer Operation

    8-6. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP(ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button.

  • Page 114: Emergency / Test Operation

    8-7. EMERGENCY / TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote con- troller run down.

  • Page 115: Mfz Microprocessor Control

    MFZ MICROPROCESSOR CONTROL MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of Open the front lid. remote controller model is on back verall view.) (This diagram shows an overall view.) .) i save button FAN SPEED CONTROL button OFF-TIMER button...

  • Page 116: Cool Operation

    9-1. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. POWER lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper-...

  • Page 117: Dry Operation

    9-2. DRY ( ) OPERATION Set temperature and initial room temperature in dry mode (1) Press OPERATE/STOP(ON/OFF) button. POWER lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature.
  • Page 118 (2) Cold air prevention control 1 When the compressor is not operating, (1) if the temperature of room temperature thermistor RT11 is less than 19°C, the fan stops. (2) if the temperature of room temperature thermistor RT11 is 19°C or more and (1) if the temperature of indoor coil thermistor is less than 0°C, the fan stops.

  • Page 119: Auto Change Over

    Time chart of defrosting in HEAT mode (reverse type) <indoor unit> vertical set position set position Horizontal vane Indoor fan (upper) Very Low (temperature of indoor coil thermistor > 18:) set speed set speed seconds Indoor fan (lower) Damper OPEN or CLOSE OPEN or CLOSE CLOSE Maximum frequency...

  • Page 120: Indoor Fan Motor Control

    9-5. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (Super High, High, Med., Low), the microprocessor adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
  • Page 121 (4) VANE AUTO ( ) mode The microprocessor automatically determines the vane angle and operation to make the optimum room temperature dis- tribution. COOL and DRY operation HEAT operation Vane angle is fixed to Angle 1. When air comes out from upper air outlet, vane angle is fixed to Angle 5.
  • Page 122 (9) Damper operation NOTE 1 : Be sure to turn off the air conditioner before changing the switch setting. With this function, air comes out simultaneously from the upper and lower air outlets so that the room can be cooled or heated effectively. This function is set using the switch behind the front grille of the indoor unit.
  • Page 123 (10) EMBEDDING THE INDOOR UNIT IN A WALL • When installing a grating, use a grating with narrow upper and lower horizontal bars so that the airflow from the upper and lower air outlets does not contact the bars. If the horizontal bars will block the lower air outlet, use a stand, etc., to adjust the height of the indoor unit.

  • Page 124: I-Save Operation

    <SWING operation> In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to “Horizontal”. According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided. Then when the downward blow has been finished, next horizontal blow time is decided. For initial 10 minutes the swing operation is performed in table G~H for quick cooling.

  • Page 125: Timer Operation

    9-9. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button.

  • Page 126: Emergency / Test Operation

    9-10. EMERGENCY / TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down.

  • Page 127: Msz-Ha Microprocessor Control

    MSZ-HA MICROPROCESSOR CONTROL MSZ-HA25VA MUZ-HA25VA MSZ-HA35VA MUZ-HA35VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section ON/OFF (operate/stop) button Temperature buttons Fan speed control button ECONO COOL button Vane control button Operation select button Timer mode select button Time set buttons RESET button Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP (ON/OFF) button ON.

  • Page 128: Cool Operation

    10-1. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper-...

  • Page 129: Heat Operation

    10-3. HEAT ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select HEAT mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 16 ~ 31°C.

  • Page 130: Indoor Fan Motor Control

    Time chart of defrosting in HEAT mode (reverse type) <indoor unit> horizontal set position set position Horizontal vane Indoor fan Very Low (temperature of indoor coil thermistor > 18:) set speed set speed seconds <outdoor unit> Maximum frequency Compressor normal seconds seconds seconds...

  • Page 131: Auto Vane Operation

    10-5. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
  • Page 132 (9) To change the air flow direction not to blow directly onto your body. To change the air HEAT When to use this function? COOL/DRY flow direction Pressing and holding Use this function if you don’t The air conditioner starts the The air conditioner starts heat- want the air from the indoor cooling or drying operation...

  • Page 133: Timer Operation

    10-6. TIMER OPERATION (ON/OFF TIMER) 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. SELECT (2) Select the timer mode by pressing the button during operation. Each time this button is pressed, the timer mode is changed in sequence: (OFF TIMER) (ON TIMER) TIMER RELEASE...

  • Page 134: Inverter System Control

    10-8. INVERTER SYSTEM CONTROL 10-8-1. Inverter main power supply circuit POWER P.C. BOARD INVERTER P.C. BOARD DB61 Power R64A R64B C63B CT761 supply C63C CT781 TR821 DB65 Booster chopper circucuit Function of main parts SYMBOL NAME FUNCTION It supplies three-phase AC power to compressor. INTELLIGENT POWER MODULE It stabilizes the DC voltage.
  • Page 135 3. Purpose of PAM adoption PAM : Pulse Amplitude Modulation PAM has been adopted for the efficiency improvement and the adaptation to IEC harmonic current emission standard. Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor.

  • Page 136: Operational Frequency Control Of Outdoor Unit

    10-8-3. Characteristics of sine wave control in case of brushless DC motor Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. This control provides the most efficient waveform corresponding to the rotation times of compressor motor. The rotation can be set to higher compared to the conventional motor drive system.

  • Page 137: Msz-Gb Microprocessor Control

    MSZ-GB MICROPROCESSOR CONTROL MSZ-GB50VA MUZ-GB50VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of remote controller model is on back (This diagram shows an overall view.) FAN SPEED CONTROL button OFF-TIMER button OPERATION SELECT button ON-TIMER button ECONO COOL button TIME SET buttons...

  • Page 138: Cool Operation

    11-1. COOL ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper-...

  • Page 139: Dry Operation

    Set temperature and 11-2. DRY ( ) OPERATION initial room temperature in dry mode (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature.
  • Page 140 3. High pressure protection In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor opera- tional frequency is controlled to prevent the condensing pressure from increasing excessively. 4. Overload starting When the room temperature thermistor RT11 reads 18°C or more, the compressor runs with its maximum frequency regulat- ed for 10 minutes after the start-up.

  • Page 141: Auto Change Over

    11-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation. 1. Mode selection (1) Initial mode At first indoor unit operates only indoor fan with outdoor unit OFF for 3 minutes to detect present room temperature. Following the conditions below, operation mode is selected.

  • Page 142: Outdoor Fan Motor Control

    11-6. OUTDOOR FAN MOTOR CONTROL Fan speed is switched according to the compressor frequency. Fan speed Down High Min. Compressor frequency Max. <Relation between compressor frequency and fan speed> Mode Fan speed Compressor frequency(Hz) COOL Down HEAT Down 11-7. AUTO VANE OPERATION 1.
  • Page 143 (8) Cold air prevention in HEAT operation. When any of the following conditions occurs in HEAT operation, the vane angle changes to Horizontal position automati- cally to prevent cold air blowing on users. Compressor is not operating. Defrosting is performed. Indoor coil thermistor RT12 reads 24: or below.

  • Page 144: Timer Operation

    11-8. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button.

  • Page 145: Emergency/Test Operation

    11-9. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down.
  • Page 146 11-10-2. Outline of main power supply circuit 1. At the start of operation Main power supply circuit is formed when X64 (Relay) is turned ON at compressor startup. To prevent rush current from running into the circuit when power supply is turned ON, R64A and R64B (Current-limiting resistor) are placed in sub circuit.

  • Page 147: Operational Frequency Control Of Outdoor Unit

    11-10-4. Characteristics of sine wave control in case of brushless DC motor Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. This control provides the most efficient waveform corresponding to the rotation times of compressor motor. The rotation can be set to higher compared to the conventional motor drive system.

  • Page 148: Expansion Valve Control (Lev Control)

    11-12. EXPANSION VALVE CONTROL (LEV CONTROL) (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each opera- tional frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air conditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temper- ature (Shell temperature) of the compressor, developing the unit’s performance.
  • Page 149 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON Positioning Opening degree is corrected according to discharge Standard Commanded temperature. opening to open degree about 5 minutes <COOL, DRY> Time about 15 minutes <HEAT> OFF Time (3) Control data (a) Reference value of target discharge temperature (COOL/HEAT :) Applied model...

  • Page 150: Mxz Microprocessor Control

    MXZ MICROPROCESSOR CONTROL MXZ-2A30VA MXZ-2A52VA MXZ-4A71VA MXZ-5A100 MXZ-2A40VA MXZ-3A54VA MXZ-4A80VA 12-1. INVERTER SYSTEM CONTROL 12-1-1. Inverter main power supply circuit MXZ-2A30/40/52VA POWER P.C. BOARD INVERTER P.C. BOARD CT61 DB61 Power C63A CT761 supply C63B C63C R64A R64B CT781 TR821 DB65 Booster chopper circucuit Function of main parts SYMBOL...
  • Page 151 12-1-2. Outline of main power supply circuit MXZ-2A30/40/52VA 1. At the start of operation Main power supply circuit is formed when X64 (Relay) is turned ON at compressor startup. To prevent rush current from running into the circuit when power supply is turned ON, R64A and R64B (Current-limitting resistor) are placed in sub circuit.
  • Page 152 MXZ-3A54VA MXZ-4A71/80VA/5A100 1. At the start of operation Main power supply circuit is formed when X64 (Relay) is turned ON at compressor startup. To prevent rush current from running into the circuit when power supply is turned ON, R64A and R64B (Current-limiting resistor) are placed in sub circuit.

  • Page 153: Expansion Valve Control (Lev Control)

    DC Motor AC Motor Rotor Permanent magnet is embedded. Excited by magnetic field of stator Rotor Position Signal Necessary Unnecessary w In brushless DC motor, permanent magnet is embedded in the rotor. Therefore, it doesn't require energy to excite the rotor like AC motor does.
  • Page 154 MXZ-3A/4A71/4A80VA The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode. wEvaporation Circulation Discharge High Capacity Pressure Temperature Amount Temperature Distribution Protection Protection Control Protection Exclusive LEV COOL Receiver LEV Exclusive LEV HEAT Receiver LEV Indoor heat Exclusive exchanger...
  • Page 155 • Add opening provided in Difference in Capacity in the table below to the standard opening from 1 to 8, when capacity of the indoor unit is excluding code 1. • Add opening provided in Difference in Operation number in the table below to determined LEV opening for each indoor unit, when 2, 3, 4 or 5 indoor units are operated at the same time.
  • Page 156 MXZ-4A80VA MXZ-5A100VA Exclusive LEV Standard opening (pulse) LEV Opening(code) COOL HEAT Difference in capacity Difference in operation number Code3,4 Code5,6 Code7,8 Code9,10 Code11,12 Code13,14 Code15or above COOL HEAT Receiver LEV Standard opening (pulse) LEV Opening(code) COOL HEAT Difference in operation number operation number COOL HEAT...
  • Page 157 MXZ-3A54VA MXZ-4A71VA Target discharge temperature (:) COOL HEAT Operation frequency 1 unit 2 units 3 units of compressor (Hz) 4 units 1 unit 2 units 3 units 4 units (MXZ-4A71VA) (MXZ-4A71VA) Minimum ~ 23 24 ~ 38 39 ~ 54 55 ~ 69 70 ~ 85 86 ~ 100...
  • Page 158 Correct the LEV opening according to the difference between target discharge temperature and discharge temperature. MXZ-2A30VA MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA LEV opening correction (pulse) Discharge temperature (:) COOL HEAT More than Target discharge temperature+10 Target discharge temperature+10 to Target discharge temperature+5 Target discharge temperature+5 to Target discharge temperature+2 Target discharge temperature+2 to Target discharge temperature-2 Target discharge temperature-2...

  • Page 159: Operational Frequency Range

    12-3. OPERATIONAL FREQUENCY RANGE MXZ-2A30VA Number of Capacity COOL (Hz) HEAT (Hz) operaing code Min. Max. (Hz) Min. Max. Defrost unit 3, 4 MXZ-2A40VA Number of Capacity COOL (Hz) HEAT (Hz) operating code Min. Max. (Hz) Min. Max. Defrost unit 3, 4 ~ 11 MXZ-2A40VA...

  • Page 160: Heat Defrosting Control

    MXZ-4A80VA Number of Capacity COOL (Hz) HEAT (Hz) operating code Min. Max. (Hz) Min. Max. Defrost unit 3, 4 8 ~ 10 11 ~ 13 14 ~ 16 17 ~ 12 ~ MXZ-4A80VA MXZ-5A100VA COOL (Hz) HEAT (Hz) Number of Capacity operating Max.

  • Page 161: Discharge Temperature Protection Control

    12-5. DISCHARGE TEMPERATURE PROTECTION CONTROL This protection controls the compressor ON/OFF and operation frequency according to temperature of the discharge temperature thermistor. (1) Compressor ON/OFF When temperature of the discharge temperature thermistor exceeds 116:, the control stops the compressor. When temperature of the discharge temperature thermistor is 80: (2A/3A/4A71/4A80VA )/ 100°C (4A80VA /5A) or less, the controls starts the compressor.

  • Page 162: Pre-Heat Control

    12-8. PRE-HEAT CONTROL MXZ-2A MXZ-4A80VA MXZ-5A The compressor is energized even while it is not operating. This is to generate heat at the winding to improve the compressor's start-up condition. Power Compressor Outside temperature 30min. 30min. 30min. 30min. 30min. 30min. 15min.

  • Page 163: Dry Operation

    12-10. DRY OPERATION 1. Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature. Room temperature minus Room temperature minus set temperature (Initial) set temperature (During operation) Thermostat -1 : or more less than -1 : -0.7 2.
  • Page 164 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Mar. 2007. No. OBT06 REVISED EDITION-D 7 Distributed in Oct. 2006. No. OBT06 REVISED EDITION-C 7 Distributed in Mar. 2006. No. OBT06 REVISED EDITION-B 7 Distributed in Aug.

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