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Mitsubishi MFZ-KA-VA Service Technical Manual Download Page 30

30

EMERGENCY OPERATION switch

E.O.

SW

Operation mode

COOL

HEAT

Set temperature

24

:

24

:

Fan speed

Medium

Medium

Horizontal vane

Auto

Auto

The operation mode is indicated by the Operation
Indicator lamp on the indoor unit as following

Operation indicator lamp

Press again <Heat>

Press once <Cool>

Press once again <Stop>

Not lighted

Lighted

2-9. 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. The unit will start and OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The Indoor fan speed runs at
High speed and the system is in continuous operation (The thermostat in ON).
After 30 minutes of test run operation the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of
24°C. The fan speed shifts to Med..
The coil frost prevention works even in emergency operation, and defrosting too.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO (

) mode.

Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any
signal from the remote controller. In case of latter normal operation will start.

NOTE : Do not press EMERGENCY OPERATION switch during normal operation.

PROGRAM TIMER

(Example 1) The current time is 8:00 PM.

The unit turns off at 11:00 PM, and on at 6:00 AM.

• 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 2) The current time is 11:00 AM.

The unit turns on at 5:00 PM, and off at 9:00 PM.

NOTE :  If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active, the timer setting is

cancelled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer
cancelled when power is restored.

OBT14A--1qxp  06.1.12 1:07 PM  Page 30

Downloaded from AC-Manual.com Manuals

Summary of Contents for MFZ-KA-VA

Page 1: ...E HEAT PUMP AIR CONDITIONERS FLOOR TYPE HEAT PUMP AIR CONDITIONERS MSZ FA VA MUZ FA VA MSZ GA VA MUZ GA VA MFZ KA VA A A A A A No OBT14 REVISED EDITION A Wireless type Models MXZ A VA A Inverter controlled multi system type Models Revision A MSZ GA80VA has been added MUZ GA VA has been added MXZ A VA has been added A A Please void OBT14 Downloaded from AC Manual com Manuals ...

Page 2: ...GE OVER AUTO MODE OPERATION 26 2 5 INDOOR FAN MOTOR CONTROL 27 2 6 OUTDOOR FAN MOTOR CONTROL 27 2 7 AUTO VANE OPERATION 27 2 8 TIMER OPERATION 29 2 9 EMERGENCY TEST OPERATION 30 2 10 INVERTER SYSTEM CONTROL 31 2 11 OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT 33 2 12 EXPANSION VALVE CONTROL LEV CONTROL 34 MSZ GA VA Indoor unit models Outdoor unit models MSZ GA50VA MUZ GA50VA MXZ A VA Refer to 4 M...

Page 3: ... 60 3 10 EMERGENCY TEST OPERATION 61 4 MXZ MICROPROCESSOR CONTROL 62 MXZ A VA Outdoor unit models MXZ 2A52VA MXZ 3A54VA MXZ 4A71VA MXZ 4A80VA 4 1 INVERTER SYSTEM CONTROL 62 4 2 EXPANSION VALVE CONTROL LEV CONTROL 66 4 3 OPERATIONAL FREQUENCY RANGE 71 4 4 HEAT DEFROSTING CONTROL 72 4 5 DISCHARGE TEMPERATURE PROTECTION CONTROL 72 4 6 REFRIGERANT RECOVERY CONTROL ON HEATING 72 4 7 OUTDOOR FAN CONTROL...

Page 4: ...utton CLOCK SET button TIME SET buttons FORWARD button BACKWARD button VANE CONTROL button Horizontal vane button OFF TIMER button i see button This diagram shows an overall view PLASMA button AREA button RESET button WIDE VANE button Vertical vane button Signal transmitting section Operation display section Temperature buttons OPERATE STOP ON OFF button FAN SPEED CONTROL button OPERATION SELECT b...

Page 5: ...temperature less than 1 0 OFF Set temperature Difference between room temperature and set temper ature during operation 4 Low outside temperature operation If the outside temperature falls to 18 C or less during operation in COOL mode the unit enters the low outside temperature operation mode Operation 1 If the unit enters the low outside temperature operation mode the outside fan rotation speed g...

Page 6: ...ton When thermostat OFF compressor OFF fan speed becomes Very Low 3 Coil frost prevention Coil frost prevention is as same as COOL mode 1 1 3 The indoor fan maintains the actual speed of the moment 4 Low outside temperature operation Low outside temperature operation is as same as COOL mode 1 1 4 1 0 0 7 1 Thermostat control Thermostat is ON or OFF by difference between room temperature and set te...

Page 7: ...peration time of the compressor has reached any of the set valuesw 30 35 40 45 55 65 75 85 95 105 115 125 150 minutes c More than 5 minutes have passed since the start up of the compressor w Set value of compressor operation time hereinafter referred to as defrost interval This is decided by the temperature of defrost thermistor and ambient temperature thermistor the previous defrosting time For e...

Page 8: ... the horizontal vane position depend on the selected operation mode when the operation mode changes over they change to the exclusive ones High Med Low Super High Super High time Rotational frequency 1 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 rotati...

Page 9: ...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 Indoor coil thermistor RT12 temperature is raising from 24 C or below but it does not exceed 39 For about 3 minutes after compressor starts 7 SWING MODE By selecting SWING mode with VANE CONTROL button the ho...

Page 10: ...et position and the air conditioner starts the cooling or drying operation in approx 3minutes 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 horizonta...

Page 11: ... air conditioner will not overcool or overheat which means you can save on electricity i see control operation is activated when i see button is pressed with a thin stick in manual COOL or manual HEAT mode NOTE i see control operation is activated when the remote controller is first used following replacement of the batteries or resetting of the remote controller i see control operation is cancell...

Page 12: ...is set to AUTO in heating operation the indoor unit automatically delivers warm air to the area where the floor wall temperature is the lowest in the room If AREA setting is set to AUTO in cooling operation the indoor unit automatically delivers cool air to the area where the floor wall temperature is the highest in the room Ex In heating operation Moving of horizontal air flow direction Indoor un...

Page 13: ...led at left Installed at right Indoor unit display AREA Remote controller display or or NOTE If the AREA setting is activated AUTO i see Sensor moves in a range of 150 degrees detecting floor wall temperature of 3 area left right center Therefore the detected temperatures may be different from the temperatures measured on commercial thermometers depending on the condition or temperature distributi...

Page 14: ...ectricity PLASMA WASH lamp Not lighted Lighted Description of PLASMA DUO operation function Both PLASMA DEODORIZING and PLASMA AIR PURIFYING operation work function PLASMA DEODORIZING operation cleans the air inside the room by adsorbing and decomposing the particles of odor releasing substances and gases such as formaldehyde function PLASMA AIR PURIFYING operation cleans the air inside the room b...

Page 15: ...tton is pressed OFF timer mode alternates between ON and OFF 2 Set the time of the timer using TIME SET buttons and Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD button is pressed the set time decreases by 10 minutes 2 Cancel TIMER setting can be cancelled with ON OFF TIMER buttons To cancel ON timer press ON TIMER button To cancel OFF timer press OFF ...

Page 16: ... MODE with a set temperature of 24 C The fan speed shifts to Med The coil frost prevention works even in emergency operation and defrosting too In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In case of latter norma...

Page 17: ...uit Function of main parts It improves power factor It rectifies AC and controls its voltage 1 14 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 limitting resistor are placed in sub circu...

Page 18: ...filter method In addition output and efficiency is enhanced by combining with vector controlled inverter in order to boost the voltage of power supplied to IPM Input current waveform without PAM Input current waveform with PAM Due to the time of no electricity Power factor gets worse Harmonic gets increased Input voltage Release of energy stored in L Energized time is extended by optimization of L...

Page 19: ...pressor motor The rotation can be set to higher compared to the conventional motor drive system So the time in which air conditioner can be operated with energy saved is longer than conventional models This can save annual electric consumption Compared to square wave control the torque pulsation is reduced at rotation so that the motor operates more quietly Since response and efficiency of motor a...

Page 20: ...ximate in 15 minutes after com pressor stops Remote controller ON LEV is positioned first full closed at zero pulse and then positioned COOL DRY MODE During 1 to 5 minutes after compressor starts HEAT MODE During 1 to 15 minutes after compressor starts LEV is fixed to standard opening degree according to opera tional frequency of compressor More than COOL DRY 5 HEAT 15 minutes have passed since co...

Page 21: ...perature Positioning Air conditioner ON Air conditioner OFF thermostat off LEV opening degree about 5 minutes COOL DRY about 15 minutes HEAT 3 Control data 06 05 04 03 02 01 LEV opening degree A target discharge temperature B C D E F 30 50 70 Operational frequency of the compressor 90 110 130 Hz A 47 41 B 53 48 C 58 55 D 63 60 E 67 65 F 67 65 a Reference value of target discharge temperature COOL ...

Page 22: ...OP ON OFF button FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button Indication of remote controller model is on back MSZ GA22VA MSZ GA25VA MUZ GA25VA MSZ GA35VA MUZ GA35VA Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state Approximate 2 or more Difference between target temperature and room temperature Approximate 2 o...

Page 23: ... gets slow down 2 Even when the unit is in the thermostat off status under the low outside temperature operation mode the outside fan rotation does not stop 3 In this mode to detect the exact outside temperature the compressor turns OFF with the outdoor fan ON for 3 minutes once 1 hour if the outside temperature rises over 18 C the unit goes back to the normal COOL mode and if the outside temperat...

Page 24: ...rature minus room temperature less than 0 2 Low 0 2 1 7 2 4 Initial temperature difference Fan speed Difference between room temperature and set tem perature during operation 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...

Page 25: ...ressor w Set value of compressor operation time hereinafter referred to as defrost interval This is decided by the temperature of defrost thermistor and ambient temperature thermistor the previous defrosting time For example the first defrost interval is 40 minutes long and the second is 45 minutes long The third and sub sequent intervals are set to be longer and less frequent depending on defrost...

Page 26: ...rature In the other cases than the above conditions the present operation mode is continued NOTE1 Mode selection is performed when multi standby refer to NOTE2 is released and the unit starts operation with ON timer NOTE2 If two or more indoor units are operating in multi system there might be a case that the indoor unit which is operating in AUTO cannot change over the other operating mode COOL H...

Page 27: ...nal the fan motor is regarded locked up When the fan motor lock up POWER lamp flashes on and off to show the fan motor abnormality 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 operation starts or finishes including timer operation b When the test run s...

Page 28: ...emote controller displays SWING mode is cancelled when VANE CONTROL button is pressed once again The air conditioner starts heat ing operation approx 3 minutes after the vane has moved to the horizontal position Sometimes the area around your feet may not warm To warn the area around the feet set the horizontal vane to AUTO or the downward blowing position When VANE CONTROL button is pressed again...

Page 29: ...L mode the air conditioner can keep comfort As a result energy can be saved ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or change to other operation mode 2 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 wi...

Page 30: ...set temperature of 24 C The fan speed shifts to Med The coil frost prevention works even in emergency operation and defrosting too In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In case of latter normal operation w...

Page 31: ...uit Function of main parts It improves power factor It rectifies AC and controls its voltage 2 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 limitting resistor are placed in sub circu...

Page 32: ...filter method In addition output and efficiency is enhanced by combining with vector controlled inverter in order to boost the voltage of power supplied to IPM Input current waveform without PAM Input current waveform with PAM Due to the time of no electricity Power factor gets worse Harmonic gets increased Input voltage Release of energy stored in L Energized time is extended by optimization of L...

Page 33: ...pressor motor The rotation can be set to higher compared to the conventional motor drive system So the time in which air conditioner can be operated with energy saved is longer than conventional models This can save annual electric consumption Compared to square wave control the torque pulsation is reduced at rotation so that the motor operates more quietly Since response and efficiency of motor a...

Page 34: ...approximate in 15 minutes after com pressor stops Remote controller ON LEV is positioned first full closed at zero pulse and then positioned COOL DRY MODE During 1 to 5 minutes after compressor starts HEAT MODE During 1 to 15 minutes after compressor starts LEV is fixed to standard opening degree according to opera tional frequency of compressor More than COOL DRY 5 HEAT 15 minutes have passed sin...

Page 35: ...pening degree is corrected according to discharge temperature Positioning Air conditioner ON Air conditioner OFF thermostat off LEV opening degree about 5 minutes COOL DRY about 15 minutes HEAT 3 Control data 06 05 04 03 02 01 LEV opening degree A target discharge temperature B C D E F 30 50 70 Operational frequency of the compressor 90 110 130 Hz a Reference value of target discharge temperature ...

Page 36: ...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 for 3 minutes 1 0 0 7 1 Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature Initial temperature difference Thermostat Room temperature minus set temperature 1 0 or more...

Page 37: ...Raise 6Hz Fixed Lower 3Hz Lower 6Hz Compressor is turned OFF for 5 minutes when temperature of indoor coil thermistor continues 3 C or less for 5 minutes or more The indoor fan maintains the actual speed of the moment 3 Coil frost prevention Temperature control When indoor coil thermistor detects following temperature for 90 seconds operational frequency of compressor is controlled according to th...

Page 38: ...e Difference between room temperature and set tem perature during operation 1 Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature Initial temperature difference Thermostat Room temperature minus set temperature less than 2 0 ON Room temperature minus set temperature 2 0 or more OFF 2 15 HEAT OPERATION 1 Press OPERATE STOP ON OFF button OPERATION IN...

Page 39: ...efrosting time For example the first defrost interval is 40 minutes long and the second is 45 minutes long The third and sub sequent intervals are set to be longer and less frequent depending on defrosting time The third and subsequent defrost intervals follow any of the three patterns 5 or 10 to 20 minutes longer the same or 5 or 10 to 20 minutes shorter compared with the previous defrost interva...

Page 40: ... which is operating in AUTO cannot change over the other operating mode COOL HEAT and becomes a state of standby 3 Indoor fan control Vane control As the indoor fan speed and the horizontal vane position depend on the selected operation mode when the operation mode changes over they change to the exclusive ones High Med Low High Rotational frequency time 2 17 INDOOR FAN MOTOR CONTROL 1 Rotational ...

Page 41: ... angle and mode changes as follows by pressing VANE CONTROL button 2 18 OUTDOOR FAN MOTOR CONTROL Fan speed is switched according to the compressor frequency COOL Fan speed Up Down Up Down Mode HEAT Indoor unit operation MUZ GA50 60 MUZ GA71 80 Relation between compressor frequency and fan speed 54Hz 39Hz 54Hz 39Hz 44Hz 33Hz 52Hz 42Hz Up Down Fan speed High Low Compressor frequency Min Max 1 In CO...

Page 42: ...hanger RT12 SWING operation makes you feel cooler than set temperature So even though the set temperature is higher than that in COOL mode the air conditioner can keep comfort As a result energy can be saved ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or change to other operation mode Indoor coil thermistor RT12 temperature NOTE1...

Page 43: ... Angle 4 repeatedly 5 WIDE MODE By selecting WIDE mode with WIDE VANE button indoor fan speed becomes faster than setting fan speed on the remote controller W The remote controller displays NOTE The position of vane angle 3 angle 4 and angle 5 are different in COOL operation and HEAT operation W Indoor fan speed becomes faster than setting fan speed on the remote controller even when or is selecte...

Page 44: ...en power is restored 2 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 3 Press ON TIMER button to set O...

Page 45: ...ote controller In case of latter normal operation will start NOTE Do not press EMERGENCY OPERATION switch during normal operation EMERGENCY OPERATION switch Lighted Not lighted Press once Cool Press again Heat Press once again Stop OPERATION INDICATOR lamp The following indication applies regardless of the shape of lamp 2 22 INVERTER SYSTEM CONTROL 2 22 1 Inverter main power supply circuit SYMBOL ...

Page 46: ... DC supplied to inverter circuit and make its waveform smooth 2 22 3 Sine wave control In these air conditioners compressor equips brushless DC motor which doesn t have Hall element In short the motor is sensorless However it s necessary to locate the polar direction of rotor in order to drive brushless DC motor efficiently The general detection method of the polar direction for such a DC motor is...

Page 47: ...r than conventional models This can save annual electric consumption Compared to square wave control the torque pulsation is reduced at rotation so that the motor operates more quietly Since response and efficiency are enhanced in sine wave control finer adjustment can be provided w In brushless DC motor permanent magnet is embedded in the rotor Therefore it doesn t require energy to excite the ro...

Page 48: ...ximate in 15 minutes after com pressor stops Remote controller ON LEV is positioned first full closed at zero pulse and then positioned COOL DRY MODE During 1 to 5 minutes after compressor starts HEAT MODE During 1 to 15 minutes after compressor starts LEV is fixed to standard opening degree according to opera tional frequency of compressor More than COOL DRY 5 HEAT 15 minutes have passed since co...

Page 49: ... about 5 minutes COOL DRY about 15 minutes HEAT 3 Control data 06 05 04 03 02 01 LEV opening degree A target discharge temperature B C D E F 30 50 70 Operational frequency of the compressor 90 110 Hz A 60 60 B 60 63 C 60 65 D 63 67 E 66 70 F 67 70 a Reference value of target discharge temperature COOL HEAT 01 150 130 02 166 150 03 186 176 04 206 196 05 230 210 06 260 226 b Reference value of LEV s...

Page 50: ...utes WIRELESS REMOTE CONTROLLER This diagram shows an overall view ra verall view Open the front lid ON TIMER button CLOCK SET button TIME SET buttons FORWARD button BACKWARD button OFF TIMER button i save button RESET button VANE CONTROL button Signal transmitting section Operation display section Temperature buttons OPERATE STOP ON OFF button FAN SPEED CONTROL button OPERATION SELECT button ECON...

Page 51: ...mperature falls to 18 C or less during operation in COOL mode the unit enters the low outside temperature operation mode Operation 1 If the unit enters the low outside temperature operation mode the outside fan rotation speed gets slow down 2 Even when the unit is in the thermostat off status under the low outside temperature operation mode the outside fan rotation does not stop 3 In this mode to ...

Page 52: ...pressor OFF fan speed becomes Very Low 3 Coil frost prevention Coil frost prevention is as same as COOL mode 3 1 3 The indoor fan maintains the actual speed of the moment 4 Low outside temperature operation Low outside temperature operation is as same as COOL mode 3 1 4 1 0 0 7 1 Thermostat control Thermostat is ON or OFF by difference between room temperature and set temperature Initial temperatu...

Page 53: ...efrosting is released when any of the following conditions is satisfied a The defrost thermistor continues to read 5 C or more SUZ KA25 10 C or more SUZ KA35 15 C or more SUZ KA50 for 30 seconds b Defrosting time has exceeded 10 minutes c Any other mode than HEAT mode is set during defrosting 2 Indoor fan speed control 1 Indoor fan operates at the set speed by FAN SPEED CONTROL button In Auto the ...

Page 54: ...d 1 If the room temperature thermistor RT11 reads more than set temperature COOL mode is selected 2 If the room temperature thermistor RT11 reads set temperature or less HEAT mode is selected 2 Mode change In case of the following conditions the operation mode is changed 1 COOL mode changes to HEAT mode when 15 minutes have passed with the room temperature 2 degrees below the set temperature 2 HEA...

Page 55: ... lock up POWER lamp flashes on and off to show the fan motor abnormality Fan speed is switched according to the compressor frequency 3 6 OUTDOOR FAN MOTOR CONTROL COOL Fan speed Up Down Up Down Mode HEAT Compressor frequency SUZ KA25 SUZ KA35 SUZ KA50 Relation between compressor frequency and fan speed 43Hz 33Hz 43Hz 33Hz 54Hz 41Hz 54Hz 41Hz Up Down Fan speed High Low Compressor frequency Min Max ...

Page 56: ...izontal Position 39 24 Released Cold Air Prevention 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 Indoor coil thermistor RT12 temperature is raising...

Page 57: ...n 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 This function is available in cooling and heating operation 1 How to set to blow out air from the upper and lower air outlets 2 How to set to blow out air from the upper air outlet only NOTE 1 Be su...

Page 58: ...r of nippers etc as shown below Cut the JRFBL wires Control board JRFBL JR24 Cut the wires on both ends Cut 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 If the upper o...

Page 59: ...ded For initial 10 minutes the swing operation is performed in table G H for quick cooling Also after 10 minutes when the difference of set temperature and room temperature is more than 2 the swing oper ation is performed in table D H for more cooling The air conditioner repeats the swing operation in various cycle as follows Temperature of indoor coil thermistor RT12 more than 24 C 5 2 Downward b...

Page 60: ...t time Initially AM0 00 blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK SET button ON timer setting 1 Press ON TIMER button to set ON timer Each time the button is pressed ON timer mode alternates between ON and OFF 2 Set the time of the timer using TIME SET buttons and Each time FORWARD button is pressed the set time increases by 10 minutes each tim...

Page 61: ... lamp will light The first 30 minutes of operation is the test run operation This operation is for servicing The Indoor fan speed runs at High speed and the system is in continuous operation The thermostat in ON After 30 minutes of test run operation the system shifts to EMERGENCY COOL HEAT MODE with a set temperature of 24 C The fan speed shifts to Med The coil frost prevention works even in emer...

Page 62: ...ts voltage 4 1 1 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 limitting resistor are placed in sub circuit 2 At normal operation 1 When AC runs into POWER P C board its external noise i...

Page 63: ...uctance is small No electricity runs into diode module because the voltage at both sides of smoothing capacitor is higher than input voltage Input current Input current waveform with PAM Owing to the increase of energized time Power factor gets better Harmonic gets suppressed Sine wave control In these air conditioners compressor equips brushless DC motor which doesn t have Hall element In short t...

Page 64: ...ection of the value of the current running into the motor locates the rotor position from the detected value and decides if voltage should be impressed and if frequency should be chan ged Compared to the conventional control and rotor position detection method sine wave control can provide finer adjustment of the voltage of supplied power The value of the current running into the motor is determin...

Page 65: ...le 180_ when the voltage is impressed However torque pulsation occurs at rotation in this method when the current carrying phases are switched over to other phases in sequence Therefore sine wave control system is adopted for these air conditioners because it can make the phase to phase current waveform smoother sine wave in order to drive the motor more efficiently and smoothly 4 1 2 4 Characteri...

Page 66: ... unit status COOL 5 pulse full closed HEAT MXZ 2A 59 pulse slightly opened MXZ 3A 4A 140 pulse slightly opened Thermostat ON in COOL or DRY mode Opening before stop 500 pulse in 15 minutes When the outdoor unit operates When the other indoor unit operates 5 pulse When outdoor unit stops When the other indoor unit stops or thermo off Maintain LEV opening before stop 500 pulse in 15 minutes When the...

Page 67: ...opening pulse will be changed to the standard No 4 or No 5 when the discharge temperature protection or high pressure protection is working In addition to that it will also be changed to standard No 2 or No 1 when the opening pulse of the each Exclusive LEV becomes 100 pulse or less in cooling operation or so does that of Receiver LEV in heating operation 1 2 3 4 5 200 300 400 450 500 Standard No ...

Page 68: ...equency Hz 4Hz 01 02 03 04 05 06 07 08 09 10 LEV Opening code Standard opening pulse 01 02 03 04 05 06 07 08 COOL LEV Opening code HEAT 120 100 130 110 136 120 146 130 156 146 160 160 170 170 180 180 09 190 190 10 200 200 Code5 6 Code3 4 Difference in capacity Difference in operation number COOL HEAT 3 3 6 6 Code7 8 9 9 Code9 10 12 52 Code11 12 15 55 25 65 35 75 Code13 14 Code15or above 2 20 0 3 3...

Page 69: ... 60 60 60 60 60 4 units 50 55 60 60 60 60 60 Number of operating unit Number of operating unit COOL HEAT Target discharge temperature MXZ 3A54VA MXZ 4A71VA Operation frequency of compressor Hz Minimum 23 24 38 39 54 55 69 70 85 86 100 101 Maximum 1 unit 56 69 59 60 61 62 63 2 units 60 61 64 67 67 69 70 1 unit 57 63 69 75 80 86 90 2 units 51 58 64 71 77 83 90 Number of operating unit Number of oper...

Page 70: ... 10 Target discharge temperature 10 or less COOL 5 4 2 0 1 3 4 HEAT 8 3 1 0 1 2 3 MXZ 2A52VA Discharge temperature LEV opening correction pulse More than Target discharge temperature 12 Target discharge temperature 12 to Target discharge temperature 5 Target discharge temperature 5 to Target discharge temperature 3 Target discharge temperature 3 to Target discharge temperature 3 Target discharge t...

Page 71: ...30 58 58 58 58 58 66 66 88 88 Max 63 63 63 100 100 100 100 100 100 100 112 112 112 112 112 112 HEAT Hz Defrost 63 63 63 100 100 100 100 100 100 100 100 100 100 100 100 100 MXZ 3A54VA MXZ 4A71VA Number of operating unit 1 2 Capacity code 1 2 3 4 5 6 7 2 3 4 5 6 7 8 9 10 11 12 13 14 Min 20 20 20 20 20 20 30 COOL Hz Max 65 65 65 100 100 100 100 DRY Hz 25 25 30 75 75 75 75 Min 30 30 30 30 30 30 30 Max...

Page 72: ...de 1 When temperature of defrosting thermistor is 3 or less 2 When specified non defrosting time is counted in the control p c board is satisfied Total time of compressor operating Going to defrosting mode at both condition of 1 and 2 2 Defrosting operation 1 Compressor stops for 50 seconds Indoor fan is off Defrosting lamp lights 2 4 way valve reverses flow Compressor operates by the frequency in...

Page 73: ...fan speed is fixed to Low speed Or the indoor coil thermistor is 45 or less on HEAT operation fan speed is back to normal 4 7 OUTDOOR FAN CONTROL COOL Fan speed Up Down Up Down Mode HEAT Compressor frequency Relation between compressor frequency and fan speed 40Hz 30Hz 40Hz 30Hz Up Down Fan speed High Low Compressor frequency Min Max Downloaded from AC Manual com Manuals ...

Page 74: ... notice C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jan 2006 No OBT14 REVISED EDITION A 7 Distributed in Aug 2005 No OBT14 8 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN Downloaded from AC Manual com Manuals ...

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