Mitsubishi Electric MS-A WA Service Technical Manual Download Page 2

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Revision A:

•

MXZ-3A30NA-

has been added.

Revision B:

•

MXZ-2A20NA-

MXZ-4A36NA, MSZ-FD, MSZ-D and MSY-D have been added.

Revision C:

•

MXZ-2A20NA-

has been added.

Revision D:

•

MSZ-GA•NA and MSY-GA•NA have been added.

Revision E:

•

MSZ-FE•NA, MSZ-GE•NA, MSY-GE•NA and MXZ-B•NA have been added.

Revision F:

•

MXZ-2B20NA-

, MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA and MFZ-KA09/12/18NA have been added.

Revision G:

•

MSZ-FE18NA, MSZ-GE24NA and MSY-GE24NA have been added.

Revision H:

•

MXZ-3B24NA -

, MXZ-3B30NA -

and MXZ-4B36NA -

have been added.

Summary of Contents for MS-A WA

Page 1: ... EDITION H Please void OBT16 REVISED EDITION G Revision H MXZ 3B24NA 1 MXZ 3B30NA 1 and MXZ 4B36NA 1 have been added Models MS A WA MU A WA MSZ A NA MUZ A NA U MSY A NA MUY A NA MSZ FD NA MUZ FD NA U MSZ FE NA MUZ FE NA MSZ D NA MUZ D NA U MSY D NA MUY D NA MSZ GA NA MUZ GA NA U MSY GA NA MUY GA NA MSZ GE NA MUZ GE NA MSY GE NA MUY GE NA MFZ KA NA MXZ A NA 1 2 MXZ B NA 1 CONFIDENTIAL FOR INTERNAL ...

Page 2: ...ded Revision D MSZ GA NA and MSY GA NA have been added Revision E MSZ FE NA MSZ GE NA MSY GE NA and MXZ B NA have been added Revision F MXZ 2B20NA 1 MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA and MFZ KA09 12 18NA have been added Revision G MSZ FE18NA MSZ GE24NA and MSY GE24NA have been added Revision H MXZ 3B24NA 1 MXZ 3B30NA 1 and MXZ 4B36NA 1 have been added ...

Page 3: ...FAN MOTOR CONTROL 11 2 6 AUTO VANE OPERATION 11 2 7 INVERTER SYSTEM CONTROL 12 2 8 OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT 17 2 9 EXPANSION VALVE CONTROL LEV CONTROL 18 2 10 PRE HEAT CONTROL 20 3 MXZ MICROPROCESSOR CONTROL 21 Outdoor unit models MXZ 2A20NA MXZ 3A30NA MXZ 4A36NA MXZ 2B20NA MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA 3 1 INVERTER SYSTEM CONTROL 21 3 2 EXPANSION VALVE CONTROL LEV CONTROL ...

Page 4: ...at the set speed and the compressor stops for 5 minutes After that if the indoor coil thermistor still reads below 37 F 3 C this mode is prolonged until the indoor coil thermistor reads over 37 F 3 C Time control When the 3 conditions as follows have been satisfied for 1 hour and 45 minutes compressor stops for 3 minutes a Compressor has been continuously operating b Indoor fan speed is Low or Med...

Page 5: ...e same cycle as the compressor When the room temperature is 73 F 23 C or over When The Thermostat is ON the compressor repeats 8 minutes ON and 3 minutes OFF When The thermostat is OFF the compressor repeats 4 minutes OFF and 1 minute ON When the room temperature is under 73 F 23 C When The Thermostat is ON the compressor repeats 2 minutes ON and 3 minutes OFF When The thermostat is OFF the compre...

Page 6: ...operation of ECONO COOL operation mode the initial air flow direction is adjusted to Horizontal According to the temperature of indoor coil thermistor 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 Also after 10 ...

Page 7: ... the actual speed of the moment 4 Low outside temperature operation If the outside temperature falls to 64 F 18 C or less during operation in COOL mode the unit will switch to the low outside temperature operation mode Operation 1 Outdoor fan control The outdoor fan rotational speed slows down to maintain sufficient cooling capacity NOTE Even when the unit is in the thermostat off status under the...

Page 8: ...is as same as COOL mode 2 1 3 The indoor fan maintains the actual speed of the moment However when coil frost prevention works while the compressor is not operating its speed becomes the set speed 4 Low outside temperature operation Low outside temperature operation is as same as COOL mode 2 1 4 ON 3 6 F 2 C or more OFF less than 3 6 F 2 C 3 6 F 1 35 F 2 C 0 75 C Room temperature minus set tempera...

Page 9: ...erature thermistor is 59 F 15 C or less the fan stops if the temperature of room temperature thermistor is more than 59 F 15 C the fan operates at Very Low NOTE When 3 minutes have passed since the compressor started operation this control is released regardless of the temperature of room temperature thermistor and indoor coil thermistor 3 Warm air control MSZ FD MSZ FE MSZ GE When the following a...

Page 10: ...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 If the room temperature thermistor reads more than set temperature COOL mode is selected If the room temperature thermistor reads set temperature or less HEAT mode is se...

Page 11: ...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 temperature does not exceed 102 F 39 C within about 3 minutes after compressor starts NOTE When 2 or more indoor units are operated with multi outdoor unit even if any indoor unit turns thermostat OFF this control does not work...

Page 12: ...THING CAPACITOR CURRENT TRANSFORMER COMPRESSOR DIODE MODULE1 DIODE MODULE2 REACTOR P W V U N INTELLIGENT POWER MODULE U W MS 3 V BOOSTER CHOPPER CIRCUIT Temperature of indoor coil thermistor F C Downward blow time second Horizontal blow time second A 59 15 or less 2 23 B 59 15 to 63 17 5 20 C 63 17 to 64 18 8 17 D 64 18 to 68 20 11 14 E 68 20 to 70 21 14 11 F 70 21 to 72 22 17 8 G 72 22 to 75 24 2...

Page 13: ...tline of main power supply circuit MUZ A09 12 15 17 MUY A15 17 MUZ FD MUZ FE09 12 MUZ GE09 12 15 18 MUY GE09 12 15 18 1 At the start of operation Main power supply circuit is formed when RELAY is turned ON at COMPRESSOR startup To prevent rush current from running into the circuit when power supply is turned ON RESISTOR is placed in sub circuit 2 At normal operation When AC runs into POWER P C boa...

Page 14: ...T as mentioned above and by synchronizing the timing of switching with the zero cross point of waveform the input current waveform can be improved and the requirement of IEC harmonic current emission standard can be satisfied Since the switching synchronized with the zero cross point this simple partial switching method has the feature of lower en ergy loss compared to active filter method In addi...

Page 15: ...THING CAPACITOR and supplied to IN TELLIGENT POWER MODULE The DC Bus voltage which has been stabilized in process is converted to 3 phase AC by INTELLIGENT POWER MODULE and supplied to COMPRESSOR CURRENT TRANSFORMER which is placed in the power supply circuit to COMPRESSOR is used to measure the value of phase current and locate the polar direction of rotor with algorithm PWM Pulse width modulatio...

Page 16: ...rol makes the current transformers conduct real time detection of the value of the current running into the mo tor locates the rotor position from the detected value and decides if voltage should be impressed and if frequency should be changed Compared to the conventional control and rotor position detection method sine wave control can provide finer adjustment of the voltage of supplied power The...

Page 17: ...2 71 32 57 MUZ A15 MUY A15 10 82 15 93 10 68 MUZ A17 MUY A17 10 87 15 93 10 68 MUZ A24 MUY A24 15 110 15 108 15 102 MUZ FD09 10 52 10 100 10 41 MUZ FD12 10 62 10 100 10 41 MUZ FE09 10 52 10 100 10 41 MUZ FE12 10 62 10 100 10 41 MUZ FE18 26 120 26 124 26 120 MUZ D30 20 84 20 87 20 83 MUZ D36 20 91 20 94 20 83 MUY D30 20 79 20 79 MUY D36 20 92 20 79 MUZ GA24 MUY GA24 15 101 15 108 15 101 MUZ GE09 MU...

Page 18: ...second Opening degree adjustment LEV opening degree is always adjusted in opening direction When reduc ing the opening degree LEV is once over closed and then adjusted to the proper degree by opening General operation Unit OFF LEV remains at maximum opening degree reaches maximum opening degree approximate in 15 minutes after compressor stops Remote controller ON LEV is positioned First full close...

Page 19: ...142 61 151 66 162 72 171 77 178 81 HEAT 115 46 133 56 151 66 167 75 181 83 187 86 MUZ D MUY D COOL 126 52 135 57 149 65 167 75 183 84 187 86 HEAT 131 55 140 60 149 65 154 68 162 72 167 75 MUZ GE09 MUY GE09 COOL 126 52 136 58 149 65 153 67 158 70 160 71 HEAT 109 43 122 50 131 55 138 59 149 65 156 69 MUZ GE12 MUY GE12 COOL 127 53 140 60 147 64 153 67 162 72 169 76 HEAT 109 43 124 51 138 59 156 69 16...

Page 20: ... minutes 15 minutes 15 minutes 30minutes 30minutes When the defrost thermistor reads 69 8 F 21 C or more MUZ D MUY D 1 Outline 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 2 10 PRE HEAT CONTROL MUZ FD MUZ FE MUZ GE 1 Outline Compressor is energized to improve the start up of compressor at a low out...

Page 21: ...t 1 At the start of operation Main power supply circuit is formed when RELAY is turned ON at COMPRESSOR startup To prevent rush current from running into the circuit when power supply is turned ON RESISTOR is placed in sub circuit 2 At normal operation When AC runs into noise filter P C board its external noise is eliminated in NOISE FILTER CIRCUIT After noise is eliminated from AC it is rectified...

Page 22: ...his 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 3 1 4 Characteristics of sine wave control in case of brushless DC motor Although ordinary 3 phase induc...

Page 23: ...ding to intake super heat discharge tempera ture is included in standard opening 1 NOTE LEV opening in each frequency at DRY operation and COOL operation is the same However velocity and compressor operation frequency controls are differ ent See 3 3 OPERATIONAL FREQUENCY RANGE As far as the indoor unit velocity control goes refer to DRY operation in MICRO PROCESSOR CONTROL in indoor unit Thermosta...

Page 24: ...tandard 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 MXZ 2A20NA 3A30NA The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode Circulation Amount Control Capacity Distribution Discharge Temperature Protection High Pressure Protection Evaporation Tempe...

Page 25: ...xcluding code 1 Add opening provided in Difference in operation number in the table below to determined LEV opening for each indoor unit when 2 or 3 indoor units are operated at the same time NOTE Even when the adjusted standard opening exceeds the driving range from 59 to 500 pulse actual driving out put opening is in a range from 59 to 500 pulses MXZ 2A20NA Standard opening pulse LEV Opening cod...

Page 26: ... 224 244 274 280 Operation number Difference in operation number 2 3 4 MXZ 4A 4B COOL 28 56 84 HEAT 45 60 60 Capacity code 3 4 7 9 10 12 Indoor unit 06 09 12 15 17 24 MXZ 2A20NA 1 2 MXZ 2B20NA MXZ 2B20NA 1 Exclusive LEV Standard opening pulse LEV Opening code 1 2 3 4 5 6 7 8 9 10 COOL 120 130 136 146 156 160 170 180 190 200 HEAT 248 248 258 266 274 280 286 292 300 306 Difference in capacity Differ...

Page 27: ...ion frequency of compressor Hz Target discharge temperature F C COOL HEAT Number of operating unit 1 unit 2 units 3 units 1 unit 2 unit 3 units Minimum 14 95 35 131 55 134 6 57 125 6 52 143 6 62 122 50 15 23 104 40 131 55 134 6 57 136 4 58 150 8 66 131 55 24 32 120 2 49 136 4 58 145 4 63 149 65 165 2 74 140 60 33 41 136 4 58 140 60 149 65 154 4 68 172 4 78 152 6 67 42 50 149 65 149 65 158 70 154 4...

Page 28: ...9 5 to Target discharge temperature 5 4 3 1 1 Target discharge temperature 5 4 3 to Target discharge temperature 5 4 3 0 0 Target discharge temperature 5 4 3 to Target discharge temperature 9 5 1 1 Target discharge temperature 9 5 to Target discharge temperature 21 6 12 3 2 Target discharge temperature 21 6 12 or less 8 8 MXZ 2A20NA Superheat F C LEV opening correction pulse More than 16 2 9 3 10 ...

Page 29: ...0 75 48 100 100 12 20 100 75 48 100 100 2 8 10 30 105 52 58 112 100 11 13 30 105 52 58 112 100 14 16 30 105 52 58 112 100 17 20 105 100 58 112 100 MXZ 2A20NA 1 Number of operating unit Capacity code COOL Hz DRY Hz HEAT Hz Min Max Min Max Defrost 1 4 20 65 35 48 92 92 7 20 85 34 48 92 92 9 10 20 93 75 48 92 92 12 20 93 75 48 92 92 2 8 10 30 93 52 58 110 101 11 13 30 93 52 58 110 101 14 16 30 93 52 ...

Page 30: ...5 68 44 22 90 58 2 8 10 24 80 31 35 70 58 11 13 24 80 31 35 90 58 14 16 24 80 31 35 94 58 17 24 80 59 35 94 58 3 12 52 90 65 39 94 58 MXZ 2B20NA Number of operating unit Capacity code COOL Hz DRY Hz HEAT Hz Min Max Min Max Defrost 1 3 4 20 65 25 30 92 92 7 20 85 34 30 92 92 9 10 20 93 75 30 92 92 12 20 93 75 30 92 92 2 2 7 30 93 53 58 112 100 8 10 30 93 53 58 112 100 11 13 30 93 53 58 112 100 14 1...

Page 31: ...perature of the discharge temperature thermistor exceeds 240 8 F 116 C the control stops the compressor When temperature of the discharge temperature thermistor is 176 F 80 C 2A 3A30NA 2B 212 F 100 C 3A30NA 1 4A 3B 4B or less the controls starts the compressor 2 Compressor operation frequency When temperature of the discharge temperature thermistor is expected to be higher than 240 8 F 116 C the c...

Page 32: ...95 0 35 25 34 91 4 33 98 6 37 35 44 95 0 35 102 2 39 45 54 98 6 37 105 8 41 55 64 98 6 37 105 8 41 65 98 6 37 105 8 41 MXZ 2B20NA 1 MXZ 3B MXZ 4B 3 6 OUTDOOR FAN CONTROL Fan speed is switched according to the number of operating indoor unit and the compressor frequency Up Down Fan speed High Low Compressor frequency Min Max NOTE When the indoor coil thermistor is 134 6 F 57 C or more on HEAT opera...

Page 33: ...reaker ON 69 8 F 21 C Stop operation Start operation Defrost thermistor 30 minutes 30 minutes 30 minutes 30 minutes 30 minutes 30 minutes 15 minutes 15 minutes 30minutes 30minutes When the defrost thermistor reads 69 8 F 21 C or more 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 3 8 COOL OPERATION 2...

Page 34: ...stat control Thermostat turns ON or OFF by the difference between room temperature and set temperature ON 3 6 F 2 C or more OFF less than 3 6 F 2 C 3 6 F 1 35 F 2 C 0 75 C Room temperature minus set temperature During operation Room temperature minus set temperature Initial Thermostat ON less than 3 6 F 2 C OFF 3 6 F 2 C or more 3 15 F 1 75 C 3 6 F 2 C Thermostat Room temperature minus set tempera...

Page 35: ...ure Initial room temperature Set temperature and initial room temperature in dry mode F 2 Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button When thermostat OFF compressor OFF fan speed becomes Very Low In AUTO the fan speed is as follows 3 Coil frost prevention Coil frost prevention is as same as COOL mode 4 1 3 The indoor fan maintains the actual speed of t...

Page 36: ...or more the fan operates at set speed If the temperature of indoor coil thermistor is less than 104 F and if heating operation starts after defrosting the fan stops if the temperature of room temperature thermistor RT11 is 66 2 F or less the fan stops if the temperature of room temperature thermistor RT11 is more than 66 2 F the fan operates at Very Low NOTE When 2 or more indoor units are operate...

Page 37: ...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 If the room temperature thermistor RT11 reads more than set temperature COOL mode is selected If the room temperature thermistor RT11 r...

Page 38: ...ween room temperature and set temperature during operation Damper OPEN CLOSE 95 F 35 C 104 F 40 C Indoor coil thermistor temperature Damper OPEN CLOSE Difference between room temperature and set temperature during operation Indoor coil thermistor temperature SWING operation In swing operation of ECONO COOL operation mode the initial airflow direction is adjusted to Horizontal According to the temp...

Page 39: ...39 ...

Page 40: ...ISED EDITION H Distributed in Sep 2010 No OBT16 REVISED EDITION G 6 Distributed in Mar 2010 No OBT16 REVISED EDITION F 6 Distributed in Sep 2009 No OBT16 REVISED EDITION E 5 Distributed in Mar 2009 No OBT16 REVISED EDITION D 4 Distributed in Jul 2008 No OBT16 REVISED EDITION C 6 Distributed in Feb 2008 No OBT16 REVISED EDITION B 6 Distributed in May 2007 No OBT16 REVISED EDITION A 7 Distributed in...

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