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MXZ-B•NA - Mitsubishi Electric

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1. amp 1 MS MICROPROCESSOR CONTROL 4 Indoor unit models Outdoor unit models MS A09 12WA MU A09 12WA 1 1 COOL OPERATION EET 4 1 2 DRY OPERATION WRERRREORKORESNERSRRFERRESRVORMOREORRSFERRRERRWRRRORESSRSRERSRERKSRRRRKEORRORRSRRRRRERRRRRRORROSRORRSEBENRERRERERRRRRRR RESSRREEASENGRRRAR REES 4 1 3 AUTO VANE OPERATION WaWRSEMSRRSERERRERA ERFERRVENSESWRERVERCRRRERKRRESESSRRSRAWANSERCERESEERERFERERREENREREEREERRRRRSHREREERRRSREERRORECERRENARNEE 6 2 MSZ MSY MICROPROCESSOR CONTROL T ETT CRT CRETE EECA CCR CTT CERT CRECRTCLCTLCR LECCETETEDEEETLT CRT CRERC CERRO CE RINT 7 Indoor unit models Outdoor unit models MSZ A09 12 15 17 24NA MUZ A09 12 15 17 24NA MSY A15 17 24NA MUY A15 17 24NA MSZ FD09 12NA MUZ FD09 12NA MSZ FE09 12 18NA MUZ FE09 12 18NA MSZ D30 36NA MUZ D30 36NA MSY D30 36NA MUY D30 36NA MSZ GA24NA MUZ GA24NA MSY GA24NA MUY GA24NA MSZ GE06 09 12 15 18 24NA MUZ GE09 12 15 18 24NA MSY GE09 12 15 18 24NA MU Y GE09 12 15 18 24NA 2 1 COOL OPERATION 7 2 2 DRY OPERATION 8 2 3 OPERATION 8 2 4 AUTO CHANGE OVER uae AUTO MODE OPERATION 10 2 5 OUTDOOR FAN MOTOR CONTROL 11 2 6
2. COOL Hz HEAT Hz Min Max DRY ne Max Defrost 4 20 65 25 92 92 7 20 85 34 92 92 20 93 75 92 92 12 20 93 75 92 92 40 93 53 40 93 53 40 93 53 40 93 93 Capacity code 29 2 2 20 Number of operating unit Capacity code COOL Hz Min Max Defrost 3 4 20 65 92 7 20 85 92 9 10 20 93 92 12 20 93 92 2 2 20 Number of operating unit 2 7 30 93 30 93 30 93 30 93 Capacity code 30 93 DRY Hz Defrost 3 4 30 92 7 30 92 9 10 38 92 12 62 92 MXZ 3A30NA Number of operating unit 5 7 58 99 58 99 58 99 58 99 Capacity code 58 COOL Hz Min Max 99 Defrost 4 15 58 48 7 15 58 48 15 62 58 12 15 68 58 24 80 58 24 80 58 24 80 58 24 80 58 MXZ 3A30NA Number of operating unit XZ AA36NA Capacity code 52 90 COOL Hz Min Max DRY Hz HEAT Hz 58 Max Defrost 4 25 58 25 70 58 7 25 58 25 70 58 25 71 25 80 58 12 25 80 35 80 58 25 80 31 80 58 25 80 31 80
3. Med between 1 8 and 3 15 F a Low less than 1 8 F 1 C se QC 3 Coil frost prevention 8 5 Coil frost prevention is as same 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 2 3 HEAT OPERATION MSZ 1 Thermostat control Thermostat turns ON or OFF by difference between room temperature and set temperature Room temperature minus Room temperature minus MSZ FE18 MSZ GE24 Thermostat set temperature Initial set temperature During operation ON less than 1 8 F 1 C ped p 1 8 F 1 C or more 35 F 18 F 0 75 C 1 C Room temperature minus Room temperature minus Other models Thermostat set temperature Initial set temperature During operation less than 3 6 F 2 C T 1 6 1 3 6 F 2 C or more 3 15 F 3 6 F 1 75 C 2 C 2 Indoor fan speed control 1 Indoor fan operates at the set speed by FAN SPEED CONTROL button In Auto the fan speed is as follows Set temperature minus Set temperature minus room Fan speed room temperature In
4. 149 65 158 70 140 60 140 60 86 Maximum MXZ 2A20NA 158 70 MXZ 2B20NA MXZ 2B20NA 1 Target discharge temperature F C 158 70 140 60 140 60 Operation frequency of compressor Hz COOL HEAT Number of o perating unit 1 unit 2 units 1 unit 2 units Minimum 23 95 35 136 4 58 122 50 122 50 24 38 104 40 140 60 132 8 56 122 50 39 54 120 2 49 149 65 140 60 132 8 56 55 69 136 4 58 154 4 68 145 4 63 140 60 70 85 149 65 158 70 150 8 66 140 60 86 Maximum MXZ 3A30NA 158 70 158 70 Target discharge temperature F C 152 6 67 140 60 Operation frequency COOL HEAT of compressor Hz Number of o perating 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 68 172 4 78 161 6 72 51 59 154 4 68 154 4 68 163 4 73 154 4 68 172 4 78 168 8 76 60 68 158 70 158 70 167 75 154
5. 11 lt SWING operation gt 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 Also after 10 minutes when the difference of set temperature and room temperature is more than 3 6 F 2 C the swing operation is performed in table D H for more cooling The air conditioner repeats the swing operation in various cycle as follows Temperature of indoor Downward blow time Horizontal blow time coil thermistor F C second second 59 15 or less 2 23 59 15 to 63 17 5 20 63 17 to 64 18 8 17 64 18 to 68 20 11 14 68 20 to 70 21 14 70 21 to 72 22 17 72 22 to 75 24 20 more than 75 24 23 G Tm oio gt 2 7 INVERTER SYSTEM CONTROL 2 7 1 Inverter main power supply circuit MUZ A09 12 15 17 MUY A15 17 MUZ FD MUZ FE09 12 MSZ GE06 09 12 15 18 MUY GE09 12 15 18 i CURRENT DIODE TRANSFORMER MODULE1 POWER SUPPLY INTELLIGENT COMPRESSOR POWER MODULE SWITCHING e r POWER MODULE2 TRANSISTOR 4 Function of main parts NAME FUNCTION INTELLIGENT POWER MODULE It supplies 3 phase AC
6. 142 61 153 67 162 72 169 76 109 43 124 51 138 59 156 69 167 75 176 80 131 55 142 61 151 66 162 72 171 77 178 81 115 46 133 56 151 66 167 75 181 83 187 86 126 52 135 57 149 65 167 75 183 84 187 86 131 55 140 60 149 65 154 68 162 72 167 75 126 52 136 58 149 65 153 67 158 70 160 71 109 43 122 50 131 55 138 59 149 65 156 69 127 53 140 60 147 64 153 67 162 72 169 76 109 43 124 51 138 59 156 69 167 75 176 80 120 49 131 55 147 64 153 67 162 72 169 76 109 43 124 51 138 59 156 69 167 75 176 80 135 57 140 60 144 62 153 67 165 74 178 81 140 60 149 65 158 70 167 75 167 75 167 75 In COOL operation the indoor coil thermistors main and sub sense temperature ununiformity super heat at the heat exchanger and when temperature difference develops the indoor coil thermistors adjust LEV opening degree to get approximate 18 F 10 C lower temperature than the target temperature in the table above thus diminishing super heat MUZ A09 12 MUZ A15 17 MUY A15 17 MUZ A24 MUY A24 MUZ GA MUY GA MUZ FD MUZ FE09 12 MUZ FE18 MUZ GE24 MUY GE24 MUZ D MUY D MUZ GE09 MUY GE09 MUZ GE12 MUY GE12 MUZ GE15 MUY GE15 MUZ GE18 MUY GE18 19 amp 2 10 PRE HEAT CONTROL MUZ FD MUZ FE MUZ GE 1 Outline Compressor is energized to
7. 2 Maximum minimum frequency in each operation mode Operational frequency Hz Applied model COOL HEAT MUZ DRY Minimum Maximum Minimum Maximum Minimum Maximum MUZ A09 32 70 32 76 32 57 MUZ A12 32 73 32 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 15 15 MUZ FD09 10 52 10 10 41 MUZ FD12 10 62 10 10 41 MUZ FE09 10 52 10 10 41 MUZ FE12 10 62 10 10 41 MUZ FE18 26 26 26 MUZ D30 20 84 20 20 83 MUZ D36 20 91 20 20 83 MUY D30 20 79 20 79 MUY D36 20 92 20 79 MUZ GA24 MUY GA24 15 15 15 MUZ GE09 MUY GE09 28 93 30 28 48 MUZ GE12 MUY GE12 20 98 30 30 55 MUZ GE15 MUY GE15 15 90 15 15 54 MUZ GE18 MUY GE18 15 98 15 15 83 MUZ GE24 MUY GE24 26 26 26 x The operation frequency in COOL mode is restricted by the upper limit frequency after 1 hour or 0 5 1 hour as shown below for dew prevention It is rated frequency or less Maximum frequency Upper limit 1 hour frequency or Rated frequency or less 0 5 1 hour amp Time 17 2 9 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 l
8. F 135F 1 C 0 75 2 Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat s OFF ON In AUTO the fan speed is as follows Room temperature minus Room temperature minus Fan speed set temperature Initial set temperature During operation High 3 15 F 1 75 C or more lt lt Med between 1 8 and 3 15 F qd Low less than 1 8 F 1 C 3 C 1 8 F 3 15 F 1 1 75 3 Coil frost prevention Temperature control When the indoor coil thermistor RT12 reads 37 F 3 C or below the coil frost prevention mode starts immediately However the coil frost prevention does not work for 5 minutes since the compressor has started The indoor fan operates 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 c Room temperature is below 79 F 26 C When compressor stops the accumulated time is cancelled and when compressor restarts time counting starts from the beginning Time counting
9. In brushless DC motor permanent magnet is embedded in the rotor Therefore it does not require energy to excite the rotor like AC motor does However it is necessary to control the frequency of 3 phase AC current supplied to the stator accord ing to the polar direction of magnet embedded in the rotor so as to drive the motor efficiently Controlling 3 phase AC current frequency also means controlling the timing to switch the polarity of stator Therefore the polar direction of rotor needs to be detected 3 1 5 Control Method of Rotational speed Sine wave control 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 value of the current running into the motor is determined by each motor characteristic 22 3 2 EXPANSION VALVE CONTROL LEV CONTROL Linear expansion valve LEV is controlled by Thermostat ON commands given from each unit Indoor unit status LEV opening Stop of all indoor unit Opening before stop 500 pulses in 15 minutes When outdoor unit is operating some indoor units stop and some operate COOL 5 pulses full closed HEAT MXZ 2A 3A30NA 2B 1
10. end of one heap in one waveform cycle 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 2 7 4 Characteristics of sine wave control in case of brushless DC motor Although ordinary 3 phase induction motor requires energy to excite the magnetic field of rotor brushless DC motor does not need it So higher efficiency and torque are provided This control provides the most efficient waveform corresponding to the rotational speed of compressor 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 less energy 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 the response and efficiency of motor are enhanced in sine wave control finer adjustment can be provided DC Motor AC Motor Rotor Permanent magnet is embedded Excited by magnetic field of stator Rotor Position Signal Necessary Unnecessary brushless DC motor permanent magnet is embedded
11. 58 25 80 42 80 58 25 80 42 80 58 3 MXZ 3A 25 80 52 80 58 3 MXZ 4A 25 90 52 58 4 MXZ 4A 25 90 52 30 58 a0 MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA Number of operating unit COOL Hz HEAT Hz Min Max I Max Defrost 3 4 15 58 70 70 7 15 58 70 70 9 10 15 71 80 80 12 15 80 80 80 5 7 25 80 80 80 8 10 25 80 80 80 11 13 25 80 80 80 14 16 25 80 80 80 17 25 80 80 80 3 MXZ 3B 9 52 80 80 80 3 MXZ 4B 9 52 90 80 4 2 4 12 62 90 80 Capacity code 3 4 HEAT DEFROSTING CONTROL 1 Starting conditions of defrosting When the following conditions a c are satisfied the defrosting starts a The defrost thermistor reads 26 6 F 3 C or less b The cumulative operation time of the compressor has reached any of the set values defrost interval 40 150 min utes c More than 5 minutes have passed since the start up of the compressor x The defrost interval is decided by the previous defrosting time The next defrost interval extends or shortens 0 20 minutes compared with the previous defrost interval 2 Releasing conditions of defrosting Defrosting is released when any one of the following conditions is satisfied a The defrost thermistor continues to read 50 7 F 10 4 C b Defrosting time exceeds 10 minutes c Any other mode than HEAT mode is
12. OBT16 7 New publication effective Jan 2011 Specifications subject to change without notice
13. figure below LEV opening is controlled in proportion to the operation frequency NOTE Opening is adjusted at the standard opening according to the indoor unit conditions However inclination of standard opening in each point of opening does not change with the original curve Add opening provided in Difference in capacity 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 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 10 e 08 07 06 05 04 03 02 01 LEV Opening code 23 38 54 69 84 100 115 131 146 MXZ 2A 2B 14 23 32 41 50 59 68 77 86 MXZ 3A 4A Compressor operating frequency Hz MXZ 2A20NA Standard opening pulse LEV Opening code 3 4 5 6 7 8 COOL 136 146 156 160 170 180 HEAT 120 130 146 160 170 180 Difference in capacity Difference in operation number Code3 4 Code5 6 Code7 8 Code9 10 Code11 12 Code13 14 Codetdor above 3 6 9 12 15 25 35 3 6 9 52 55 65 75 MXZ 3A30NA Standard opening pulse LEV Opening code 3 4 5 6 7 8 COOL 134 13
14. operation in various cycle as follows Temperature of indoor Downward blow time Horizontal blow time coil thermistor F C second second 59 15 or less 2 23 59 15 to 63 17 5 20 63 17 to 64 18 8 17 64 18 to 68 20 11 14 68 20 to 70 21 14 70 21 to 72 22 17 72 22 to 75 24 20 more than 75 24 23 A B D E F G H 2 MSZ MSY MICROPROCESSOR CONTROL E 2 1 COOL OPERATION 1 Thermostat control Thermostat turns ON or OFF by the difference between room temperature and set temperature Room temperature minus Room temperature minus Thermostat set temperature Initial set temperature During operation ON 1 8 F 1 C or more OFF less than 1 8 F 1 C AE 8F 135F C 0 75 2 Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat s OFF ON In AUTO the fan speed is as follows Room temperature minus Room temperature minus Fan speed set temperature Initial set temperature During operation High 3 15 F 1 75 C or more Med between 1 8 and 3 15 F Low less than 1 8 F 1 C 3 C 1 8 F 3 15 F 1 1 75 3 Coil frost prevention The compressor operational fr
15. power to compressor SMOOTHING CAPACITOR T the DC voltage and supplies it to INTELLIGENT POWER MOD CURRENT TRANSFORMER It measures the current of the compressor motor DIODE MODULE 1 It converts the AC voltage to DC voltage It absorbs the rush current not to run into the main power supply circuit when RESISTOR the electricity turns ON RELAY It keeps the RESISTOR which restricts rush current short circuited while the compressor is operating DIODE MODULE 2 BOOSTER It improves power factor ccu ER ar It controls the bus bar voltage REACTOR 12 MUZ A24 MUY A24 MUZ D MUY D MUZ FE18 MUZ GA MUY GA MUZ GE24 MUY GE24 CURRENT TRANSFORMER REACTOR il CAPACITOR POWER RESISTOR SUPPLY RELAY POWER FACTOR INTELLIGENT COMPRESSOR CORRECTION POWER MODULE MODULE Function of main parts FUNCTION INTELLIGENT POWER MODULE It supplies 3 phase AC power to compressor SMOOTHING CAPACITOR It stabilizes the DC voltage and supplies it to INTELLIGENT POWER MODULE CURRENT TRANSFORMER It measures the current of the compressor motor REACTOR POWER FACTOR CORRECTION MODULE It absorbs the rush current not to run into the main power supply circuit when the RESISTOR electricity turns ON It rectifies AC controls its voltage and improves the power factor of power supply RELAY It keeps the RESISTOR which restri
16. set during defrosting 3 5 DISCHARGE TEMPERATURE PROTECTION CONTROL This protection controls the compressor ON OFF and operation frequency according to temperature of the discharge tempera ture thermistor 1 Compressor ON OFF When temperature 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 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 control decreases 12 Hz from the current frequency When temperature of the discharge temperature thermistor is expected to be higher than 231 8 F 111 C and less than 240 8 F 116 C the control decreases 6 Hz from the current frequency When temperature of the discharge temperature thermistor is expected to be higher than 219 2 F 104 C and less than 231 8 F 111 C the control is set at the current frequency 31 3 6 OUTDOOR CONTROL Fan speed is switched according to the number of operating indoor unit and the compressor frequency MXZ 2B20NA lt Relation between compressor frequency and fan speed gt Compressor frequency Hz Down Up MXZ 2B20NA 30 40 Fan speed Min Compressor frequency Max NOTE When the indoor coil
17. 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 it is rectified to DC by REACTOR and POWER FACTOR CORRECTION MODULE If the operating frequency becomes 25 Hz or more DC voltage rises to 370 V DC voltage to which has AC been rectified by process is stabilized by SMOOTHING 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 modulation controls impressed voltage and frequency with those pieces of information 3 Power factor improvement Booster coil reactor and POWER FACTOR CORRECTION MODULE rectify AC to DC and control its voltage In the motor drive system of sine wave control power factor can be improved by reducing harmonics POWER FACTOR CORRECTION MODULE and reactor stabilize the voltage of DC supplied to inverter circuit and make its waveform smooth 4 Intelligent power module INTELLIGENT POWER MODULE consists of the following components IGBT x6 Converts DC waveform to 3 phase AC waveform and outputs it Drive Circuit Drives transistors Prot
18. temperature of room temperature thermistor and indoor coil thermistor MSZ A24 MSZ GA When the compressor is not operating 1 if the temperature of room temperature thermistor is 59 F 15 C or less or temperature of indoor coil thermis tor is less than 64 F 18 C the fan stops if the temperature of room temperature thermistor is more than 59 F 15 C or temperature of indoor coil thermistor is more than 64 F 18 C the fan operates at Very Low When the compressor is operating 1 if the temperature of indoor coil thermistor is 64 F 18 C or more the fan operates at set speed if the temperature of indoor coil thermistor is less than 64 F 18 C and i if heating operation starts after defrosting the fan stops ii if the temperature of room temperature 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 any condition of a c and the condition of are satisfied at the same time warm air control works Fan speed is used in MANUAL b When cold air prevention has been released c When defrosting has been finished When the temperatur
19. thermistor is 134 6 F 57 or more on HEAT operation fan speed is fixed to Low speed Or the indoor coil thermistor is 113 F 45 C or less on HEAT operation fan speed is back to normal MXZ 2B20NA MXZ 3B MXZ 4B COOL Fan speed changes so that the condensing temperature stays within the target range Revolution per minutes rpm Fan speed MXZ 3B MXZ 2B20NA MXZ 4B Frequency Hz Target condensing temperature F C 24 87 8 31 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 41 100 100 150 150 200 200 250 250 300 300 350 350 400 400 450 450 500 500 550 550 600 600 650 650 700 700 750 750 Ooj O1 OO N HEAT Fan speed is switched according to the compressor frequency Compressor speed Hz Fan speed Fan speed MXZ 3B MXZ 2B20NA MXZ 4B Up 30 50 23 40 Min Compressor frequency Max 32 3 7 PRE HEAT CONTROL MXZ 2A20NA 1 7 MXZ 3A30NA 1 MXZ 4A36NA MXZ 2B20NA MXZ 2B20NA MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA 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 A Power ON OFF D
20. 4 68 172 4 78 168 8 76 69 77 167 75 163 4 73 176 80 154 4 68 172 4 78 168 8 76 78 86 167 75 167 75 179 6 82 154 4 68 172 4 78 168 8 76 87 Maximum 167 75 176 80 179 6 82 27 172 4 78 172 4 78 168 8 76 MXZ 3A30NA 7 MXZ 4A36NA MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA Target discharge temperature F C Operation frequenc COOL HEAT of composer Hz Number of operating unit 1 unit 2unis 3units 4 Units 4 units MXZ 4A 4B 1 unit 2 unit 3 units MXZ 4A 4B Minimum 14 95 35 131 55 134 6 57 140 60 125 6 52 143 6 62 122 50 122 50 15 23 107 6 42 131 55 134 6 57 140 60 136 4 58 150 8 66 131 55 122 50 24 32 120 2 49 136 4 58 145 4 63 140 60 149 65 165 2 74 140 60 122 50 33 41 136 4 58 140 60 149 65 143 6 62 154 4 68 172 4 78 152 6 67 122 50 42 50 149 65 149 65 158 70 149 65 154 4 68 172 4 78 161 6 72 131 55 51 59 154 4 68 154 4 68 163 4 73 158 70 154 4 68 172 4 78 168 8 76 140 60 60 68 158 70 158 70 167 75 158 70 154 4 68 172 4 78 168 8 76 140 60 69 77 167 75 163 4 73 176 80 161 6 72 154 4 68 172 4 78 168 8 76 140 60 78 86 167 75 167 75 179 6 82 161 6 72 154 4 68 172 4 78 168 8 76 140 60 87 Maximum 167 75 176 80 179 6 82 161 6 72 172 4 78 172 4 78 168 8 76 140 60 Correct the LEV opening according to the
21. 40 pulses slightly opened MXZ 3A30NA 1 JAA 3B 4B 100 59 pulses When the outdoor unit operates When the other indoor unit operates 5 pulses When outdoor unit stops When the other indoor unit stops or thermo OFF Maintain LEV opening before stop 500 pulses in 15 minutes Thermostat ON in COOL or DRY mode LEV opening for each indoor unit is determined by adding adjustment according to the number of operating unit and the capacity class to standard opening based on the operation frequency e g Opening 130 pulses in standard opening 1 Minimum 80 pulses Maximum 205 pulses Capacity code 4 at 1 unit operation Capacity code 1 at 3 units operation After starting operation adjustment according to intake super heat discharge tempera ture is included in standard opening x1 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 Thermostat OFF in HEAT mode When the outdoor unit operates When the other indoor unit operates 140 pulses When the outdoor unit stops When the other indoor unit stops or thermo OFF Main tain LEV opening before stop 500 pulses in 15 minutes Thermostat ON in HEAT mode LEV open
22. 8 140 142 182 228 HEAT 150 170 180 200 224 244 Difference in capacity Difference in operation number Code3 4 Code5 6 Code7 8 Code9 10 Code11 12 Code13 14 Codetdor above 3 3 6 9 12 15 25 35 30 3 6 9 52 55 65 75 0 25 MXZ 2A20N A 1 MXZ 2B20NA MXZ 2B20NA Exclusive LEV Standard opening pulse LEV Opening code 3 4 5 6 7 8 COOL 136 146 156 160 170 180 HEAT 258 266 274 280 286 292 Difference in capacity Difference in operation number Code5 6 Code7 8 Code9 10 Code11 12 Code13 14 Codet5or above 2 6 9 12 15 25 35 20 6 9 52 55 65 75 30 Receiver LEV Standard opening pulse LEV Opening code 3 4 5 6 7 8 COOL 160 170 180 190 200 200 HEAT 90 110 120 130 140 150 Difference in operation number 2 COOL 20 HEAT 30 Operation number MXZ 3A30NA Exclusive LEV MXZ 4A36NA MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA Standard opening pulse LEV Opening code 3 4 5 6 7 8 COOL 134 138 150 160 170 180 HEAT 258 266 274 280 286 292 Difference in capacity Difference in operation number Code3 4 Code5 6 Code7 8 Code9 10 Code11 12 Code13 14 C
23. AUTO VANE OPERATION WSRRRERSERSRRRRRRRESRRKUNRSRESRERRERREESKSRREERRRESRRRRERSEKSRERRREREREREERRRRKESRRRRERRRERRRRERCRIGERVRERGRRVRRCRFESERERERERU 11 2 T INVERTER SYSTEM CONTROL 12 2 8 OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT 17 2 9 EXPANSION VALVE CONTROL LEV CONTROL RRC CRT TREE COCR CROCCRET CRT CER CEC EC RC CC Cc t 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 P I EET CREPE TITLE CCEETERETET ED TEC CCE ETE TCE TCP CC PELE Ee CEE PLCC PETC LE MERERI NRYNRESE ES 21 2 2 EXPANSION VALVE CONTROL LEV CONTROL 23 3 3 OPERATIONAL FREQUENCY RANGE 29 3 4 DEFROSTING CONTROL RETE CROC LICR RCE CR ERC CPC CTR TCR ER T E A 31 3 5 DISCHARGE TEMPERATURE PROTECTION CONTROL VavesssscssqessanewabeusssusVasaloguueuaPeusssusssvsesuacessuquasavessueossucep SU 31 3 6 OUTDOOR FAN CONTROL CCT RT ERECT COTE 32 3 7 PRE HEAT CONTROL WEBER AERRRRURESEESNERWERRRERSRVEERCAESREFFRERRARRRVERVRARSARREESREKSRERERERESERVEREKRERSRVREERESERSEERCRKORRREAFERAUERURRSRRRENEKERE 33 3 8 COOL OPERATION seussssssuessessssesssecesssvasessesssesussscsusesuesssessu ssseasssususasu ssseassvesssu
24. Changes for the Better MITSUBISHI Revision H ELECTRIC e MXZ 3B24NA MXZ 3B30NA MXZ 4B36NA 1 have been added SPLIT TYPE AIR CONDITIONERS Please void OBT16 REVISED EDITION G No OBT16 REVISED EDITION H SERVICE TECHNICAL GUIDE Models MS AeWA MSZ A NA MUZ A NA SY A NA MUY A NA MSZ FD NA MUZ FD NA MSZ FE NA MUZ FE NA SZ DeNA MUZ DeNA MSY D NA MUY D NA MSZ GA NA MUZ GAeNA MSY GA NA MUY GA NA MSZ GE NA MUZ GE NA MSY GE NA MUY GE NA MFZ KA NA 2 m 2 MXZ BeNA CONTENTS CONFIDENTIAL FOR INTERNAL USE ONLY fa a Revision A e MXZ 3A30NA 7 has been added Revision B e MXZ 2A20NA 11 MXZ 4A36NA MSZ FD MSZ D and MSY D have been added Revision C e MXZ 2A20N 2 has been added Revision D e MSZ GA NA MSY GAsNA have been added Revision E e MSZ FE NA MSZ GE NA MSY GE NA and MXZ B NA have been added Revision F e MXZ 2B20NA T 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 e MXZ 3B24NA 13 MXZ 3B30NA 1 and MXZ 4B36NA have been added
25. FF compressor OFF fan speed becomes Very Low In AUTO the fan speed is as follows Room temperature minus Room temperature minus Fan speed set temperature Initial set temperature During operation High 3 15 F 1 75 C lt lt lt Med between 1 8 and 3 15 F Low less than 1 8 F 1 C MR ier 250 C 1 75 3 The operation of the compressor and indoor outdoor fan Compressor operates by room temperature control and time control Set temperature is controlled to fall 4 F 2 C from initial room temperature Indoor fan and outdoor fan operate in the 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 compressor repeats 4 minutes OFF and 1 minute ON Operation time chart Example Thermostat Indoor fan Outdoor fan Compressor ON lt lt gt lt 8 minutes 3 minutes 4 minutes 1 minute 4 Coil frost prevention Coil frost prevention is as same as COOL mode 2 1 3 The indoor fan maintains the actual speed of the mo
26. NTROL HEAT DEFROSTING CONTROL 3 4 Time chart of defrosting in HEAT mode reverse type sindoor ue o t iti on Horizontal vane set beeen set position Indoor fan upper set speed Very Low temperature of indoor coil thermistor gt 64 4 F set speed OFF 301 ds Indoor fan lower ON en OFF Damper 1 OPEN or CLOSE CLOSE OPEN or CLOSE 36 4 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 If the room temperature thermistor RT11 reads more than set temperature COOL mode is selected 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 COOL mode changes to HEAT mode when 15 minutes have passed with the room temperature 35 6 F below the set temperature HEAT mode changes to COOL mode when 15 minutes have passed with the room temperature 35 6 F above the set temperature In the other cases than the above conditions the present operation mode is continued NOTE41 Mode selection is performed when multi standby refer to NOTE2 is relea
27. TROL DRY OPERATION 3 9 1 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 Room temperature minus Room temperature minus Fan speed set temperature Initial set temperature During operation High 3 15 F 1 75 C or more between 1 8 3 15 1 5 TSF Low less than 1 8 F 1 C 2 5 1 8 F 3 15 F TC 1 75 C 3 Coil frost prevention Coil frost prevention is as same as COOL mode 4 1 3 The indoor fan maintains the actual speed of the moment 35 t 4 3 HEAT 4 OPERATION 1 Thermostat control Refer to MXZ MICROPROCESSOR CONTROL HEAT OPERATION 3 10 1 2 Indoor fan speed control 1 Indoor fan operates at the set speed by FAN SPEED CONTROL button In Auto the fan speed is as follows Set temperature minus Set temperature minus room Fan speed room temperature Initial temperature During operation 3 6 F 72 F Highiacssiceesidettenece 8 6 F2 C or more 2C o Med Between 0 45 and 3 6 F Low Less than 0 45 F 0 25 C 2 Cold air prevention control When the compressor is not operating If the temperatur
28. UZ FD Min Compressor frequency MUZ FE09 12 33 44 MUZ GA MUY GA MUZ GE12 15 18 MUY GE12 15 18 MUZ D MUY D MUZ GE09 MUY GE09 MUZ FE18 MUZ GE24 MUY GE24 2 6 AUTO VANE OPERATION 1 Horizontal vane 1 Cold air prevention in HEAT operation MUZ When any of the following conditions occur 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 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 in the indoor unit 2 ECONO COOL operation ECONOmical operation Excluding MSZ FD and MSZ FE09 12 When ECONO COOL button is pressed in COOL mode set temperature is automatically set 3 6 F 2 C higher than that in COOL mode Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger indoor coil thermistor 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 To cancel this operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL or VANE CONTROL button
29. When the fan motor locks up OPERATION INDICATOR lamp flashes ON and OFF to show the fan motor abnormality 37 4 6 AUTO VANE OPERATION Horizontal vane 1 Cold air prevention in HEAT operation When any of the following conditions occurs in HEAT operation the vane angle changes to Vertical position automati cally to prevent cold air blowing on users Compressor is not operating Defrosting is performed Indoor coil thermistor reads 75 2 F or below Indoor coil thermistor temperature is raising from 75 2 F or below but it does not exceed 102 2 F I Horizontal vane Indoor coil thermistor temperature Released Cold Air Prevention 75 2 F 1022F 2 Vertical Position 24 C 39 NOTE The horizontal vane automatically moves in certain intervals to determine its position and then it returns to the set position Indoor fan motor Lower in COOL OPERATION Difference between room temperature and set temperature during operation d NIE ERU CLOSE 35 6 F 44 6 F 2 C 7 C Difference between room temperature and set temperature during operation Damper Indoor fan motor Lower in HEAT OPERATION Damper Indoor coil thermistor Indoor coil thermistor temperature temperature OPEN cos T 95 F 104 35 C 40 C As for indoor fan motor upper refer to Indoor fan speed control 2 1 2 2 2 2 2 3 2 and NDOOR FAN MOTOR CONTROL 2 5 lt SWING operation gt In swing operati
30. also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 79 F 26 C However when two of the above conditions b and c are satisfied again time accumulation is resumed Operation chart Example ON Compressor Outdoor fan OFF Continuously at set speed Indoor fan ON Set t t d 1 2 DRY 6 95 35 initial room temperature in dry mode Set temperature is as shown on the right chart The system for operation uses the same refrigerant circuit as the L cooling circuit z EOF The compressor and the indoor fan are controlled by the room tem perature ons By such controls indoor flow amounts will be reduced in order to 3 lower humidity without much room temperature decrease 5 Re 3 se 15 soto Se ee EC 0 59 68 77 86 95 10 15 20 25 30 35 Initial room temperature F C E 1 Thermostat control Thermostat turns ON or OFF by the difference between room temperature and set temperature Room temperature minus Room temperature minus Thermostat set temperature Initial set temperature During operation ON Z 3 6 F 2 C or more OFF less than 3 6 F 2 C Bm um 3 6 F 135 F 2 C 0 75 2 Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button When thermostat O
31. cts rush current short circuited while the compressor is operating 2 7 2 Outline 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 board its external noise is eliminated in NOISE FILTER CIRCUIT Q After noise is eliminated from AC it is rectified to DC by DIODE MODULE 1 DC voltage to which AC has been rectified by process is stabilized by SMOOTHING CAPACITOR and supplied to IN TELLIGENT POWER MODULE DC voltage which has been stabilized in process is converted to 3 phase by INTELLIGENT POWER MODULE supplied to COMPRESSOR amp 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 modulation controls impressed voltage and frequency with those pieces of information 13 3 Purpose of PAM adoption PAM Pulse Amplitude Modulation has been adopted for the efficiency improvement and the adaptation to IEC harmonic cur rent emission standard Outline of simple partial switching method In conventional inverter mo
32. dels DIODE MODULE rectifies AC voltage to DC voltage SMOOTHING CAPACITOR makes its DC waveform smooth and INTELLIGENT POWER MODULE converts its DC voltage to imitated AC voltage again in order to drive the compressor motor However it has been difficult to meet IEC harmonic current emission standard by above circuit because harmonic gets generated in the input current waveform and power factor gets down The simple partial switching method with PAM which has been adopted this time places and utilizes BOOSTER CHOPPER CIRCUIT before rectifying AC voltage in the general passive method converter circuit As harmonic gets suppressed and the peak of waveform gets lower by adding BOOSTER CHOPPER CIRCUIT 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 addition output and efficiency is enhanced by combining with vector controlled inverter in order to boost the voltage of power supplied to INTELLIGENT POWER MODULE Input current waveform without PAM Input current waveform with PAM Due to the time of no electricity Owing to the increase of energized time Power factor gets worse Power factor gets better Har
33. difference between target discharge temperature and discharge temperature MXZ 2A MXZ 2B LEV opening correction pulse COOL HEAT More than Target discharge temperature 18 10 5 Target discharge temperature 18 10 to Target discharge temperature 9 5 4 Target discharge temperature 9 5 to Target discharge temperature 3 6 2 2 Target discharge temperature 3 6 2 to Target discharge temperature 3 6 2 0 Target discharge temperature 3 6 2 to Target discharge temperature 9 5 1 Target discharge temperature 9 5 to Target discharge temperature 18 10 3 Target discharge temperature 18 10 or less 4 Discharge temperature F C MXZ 3A MXZ 4A MXZ 3B MXZ 4B LEV opening correction pulse COOL HEAT More than Target discharge temperature 21 6 12 4 Target discharge temperature 21 6 12 to Target discharge temperature 9 5 2 Target discharge temperature 9 5 to Target discharge temperature 5 4 3 1 Target discharge temperature 5 4 3 to Target discharge temperature 5 4 3 Target discharge temperature 5 4 3 to Target discharge temperature 9 5 Target discharge temperature 9 5 to Target discharge temperature 21 6 12 Target discharge temperature 21 6 12 or less 2 Separate correction COOL DRY Correction by the separate super heat a Correct the LEV separately by temperature difference between each gas pipe temperature and the minimum gas pipe temperature of all Calculate each su
34. e protections work as well as in the normal COOL mode E 2 2 DRY dry mode Set temperature is as shown on the right chart 95 35 system for dry operation uses the same refrigerant circuit as the L cooling circuit 8600 The compressor and the indoor fan are controlled by the room tem 2 E perature Ss 77 25 By such controls indoor flow amounts will be reduced in order to 8 F lower humidity without much room temperature decrease esol g 6800 3 sos 1 Thermostat control ka l 88 d S Thermostat turns ON or OFF by the difference between room temperature Initial room temperature F C and set temperature Room temperature minus Room temperature minus Thermostat set temperature Initial set temperature During operation ON 3 6 F 2 C or more OFF less than 3 6 F 2 C 22 0 3 6 F 1 35 2 C 0 75 2 Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button When the thermostat turns OFF compressor OFF fan speed becomes Very Low In AUTO the fan speed is as follows Room temperature minus Room temperature minus Fan speed set temperature Initial set temperature During operation High 3 15 F 1 75 C or more
35. e of indoor coil thermistor is less than 104 F 40 C When warm air control works the fan speed changes as follows to blow out warm air gradually Gradation of fan speed in initial MSZ FE18 MSZ GE24 Time condition Indoor fan speed Less than 4 minutes Low 4 to 8 minutes Med More than 8 minutes High Other models Time condition Indoor fan speed Less than 2 minutes Low 2 to 4 minutes Med More than 4 minutes High or Super high The upper limit of the fan speed in MANUAL is the set speed When the temperature of indoor coil thermistor has been 104 F 40 C or more or when the set speed has been changed this control is released and the fan speed is the set speed 3 Overload starting When the room temperature thermistor reads 64 F 18 C or more the compressor runs with its maximum frequency regu lated for 10 minutes after the start up 4 Defrosting 1 Starting conditions of defrosting When the following conditions a c are satisfied the defrosting starts The defrost thermistor reads about 30 2 F 1 C or less b The cumulative operation time of the compressor has reached any of the set values defrost interval 40 150 min utes More than 5 minutes have passed since the start up of the compressor The defrost interval is decided by the previous defrosting time The next defrost interval extends or shortens 0 20
36. e of room temperature thermistor RT11 is less than 66 2 F the fan stops If the temperature of room temperature thermistor RT11 is 66 2 F or more and 1 if the temperature of indoor coil thermistor is less than 32 F the fan stops ii if the temperature of indoor coil thermistor is 32 F or more the fan operates at Very Low When the compressor is operating If the temperature of indoor coil thermistor is 104 F or more the fan operates at set speed If the temperature of indoor coil thermistor is less than 104 F and i if heating operation starts after defrosting the fan stops ii if the temperature of room temperature thermistor RT11 is 66 2 F or less the fan stops iii 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 operated with a multi type outdoor unit the fan operates intermittently at Very Low or stops in the thermostat OFF units while at least one unit is thermostat ON When 3 minutes have passed since the compressor started operation this control is released regardless of the temperature of RT11 and indoor coil thermistor 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 Defrosting Refer to MXZ MICROPROCESSOR CO
37. eads less than 69 8 F 20 C pre heat control is ON for 30 minutes When the defrost thermistor reads 69 8 F 21 C or more pre heat control is ON for 15 minutes NOTE When the unit is started with the remote controller pre heat control is turned OFF Compressor uses 50 W when pre heat control is turned ON 20 3 MXZ MICROPROCESSOR CONTROL 3 1 INVERTER SYSTEM CONTROL 3 1 1 Inverter main power supply circuit CURRENT REACTOR TRANSFORMER B o PU POWER SMOOTHING SUPPLY mm CAPACITOR Ky O O N W RELAY POWER FACTOR INTELLIGENT COMPRESSOR CORRECTION POWER MODULE MODULE Function of main parts NAME FUNCTION INTELLIGENT POWER MODULE It supplies 3 phase AC power to compressor SMOOTHING CAPACITOR It stabilizes the DC voltage and supplies it to INTELLIGENT POWER MODULE CURRENT TRANSFORMER It measures the current of the compressor motor REACTOR POWER FACTOR CORRECTION MODULE It rectifies AC controls its voltage and improves the power factor of power supply It absorbs the rush current not to run into the main power supply circuit when the power is turned ON It keeps the RESISTOR which restricts rush current short circuited while the compressor is operating RESISTOR RELAY 3 1 2 Outline of main power supply circuit 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 ru
38. ection circuit Protects transistors from over current Since the above components are all integrated in INTELLIGENT POWER MODULE INTELLIGENT POWER MODULE has a merit to make the control circuit simplified and miniaturized 5 Elimination of electrical noise NOISE FILTER CIRCUIT which is formed by CMC COILS NMC COILS and capacitors placed on the POWER P C board eliminates electrical noise of AC power that is supplied to main power supply circuit This circuit also prevents the electrical noise generated in the inverter circuit from leaking out CMC COILS Common mode choke coils NMC COILS Normal mode choke coils 15 2 7 3 Sine wave control In these air conditioners compressor equips brushless DC motor which does not have Hall element In short the motor is sensorless However it is necessary to locate the polar direction of rotor in order to drive brushless DC mo tor efficiently The general detection method of the polar direction for such a DC motor is to locate it from the voltage induced by unenergized stator Therefore it is necessary to have a certain period of time in which the stator is being unenergized for the rotor position detection when the voltage of supplied power is impressed So the motor has been driven by square wave control the conventional motor drive system which energizes the motor only when the range of electrical angle is within 120 because it is forced to be unenergized within 30 at start amp
39. efrost thermistor 69 8 F 21 C A 30 minutes 30 minutes 30 minutes 30 minutes 30 minutes Iminutes 30minutes minutes 30minutes lt gt lt gt lt gt lt gt lt gt 1 I I I I l l 1 I 30 minutes Pre heat ON OFF Breaker ON Stat Stop When the defrost operation operation thermistr reads 69 8 F 21 C or more 1 Pre heat control is turned ON for 15 or 30 minutes x after the breaker is turned ON 2 30 minutes after the unit is stopped pre heat control is turned ON for 15 or 30 minutesx and turned OFF for 30 minutes This is repeated as shown in the graph until the breaker is turned OFF X When the defrost thermistor reads less than 69 8 F 21 C pre heat control is ON for 30 minutes When the defrost thermistor reads 69 8 F 21 C or more pre heat control is ON for 15 minutes NOTE When the unit is started with the remote controller pre heat control is turned OFF Compressor uses 50 W when pre heat control is turned ON 3 8 COOL OPERATION 1 Thermostat control Thermostat turns ON or OFF by the difference between room temperature and set temperature Room temperature minus Room temperature minus Thermostat set temperature Initial set temperature During operation ON 1 8 F 1 C or more OFF less than 1 8 F 1 C CEE 1 8 F 1 35 1 C 0 75 2 Coil frost preventi
40. ent the condensing pressure from increasing excessively 34 4 MFZ MICROPROCESSOR CONTROL 4 1 COOL OPERATION 1 Thermostat control Refer to MXZ MICROPROCESSOR CONTROL COOL OPERATION 3 8 1 2 Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of the thermostat s ON In AUTO the fan speed is as follows Room temperature minus Room temperature minus Fan speed set temperature Initial set temperature During operation High 3 15 F 1 75 C or more 3 Med between 1 8 and 3 15 F Low less than 1 8 F 1 C 3 C 18 F 3 15 F 1 1 75 3 Coil frost prevention Refer to MXZ MICROPROCESSOR CONTROL COOL OPERATION 3 8 2 4 2 DRY OPERATION DAN L Settemperature and The system for dry operation uses the same refrigerant circuit as the oe initial room temperature in dry mode cooling circuit t The compressor and the indoor fan are controlled by the room tem t perature 86 By such controls indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease S 77L L E L L 2 68 o 59 F 50 L 1 i l II 1 12 50 59 68 77 86 95 F Initial room temperature 1 Thermostat control Refer to MXZ MICROPROCESSOR CON
41. equency is controlled to prevent the temperature of indoor heat exchanger from falling exces sively The compressor is turned OFF for 5 minutes when the temperature of indoor coil thermistor continues 37 F 3 C or less for 5 minutes or more The indoor fan maintains the actual speed of the moment 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 lt Operation gt 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 low outside temperature operation mode the out door fan rotation does not stop 2 Dew drop prevention When the ambient temperature thermistor reads 14 F 10 C or less the set temperature is different depending on the models as coil frost or dew drop from indoor unit may occur the compressor turns OFF with the outdoor fan OFF for prevention of them 3 Outdoor temperature detecting control To detect the exact outdoor temperature in this mode the compressor turns OFF but the outdoor fan stays ON for 3 minutes once 1 hour If the outdoor temperature rises over about 64 F 18 C the unit goes back to the normal COOL mode If the outside temperature stays below about 64 F 18 C the unit continues to run in the low outside tempera ture operation mod
42. improve the start up of compressor at a low outside temperature even when compressor is stopped 2 Pre heat control ON Compressor OFF ON Pre heat control OFF Outside temperature 68 F 20 C Pre heat control ON condition 30 minutes 1 hour 1 Compressor is not operating However pre heat control is still OFF for 30 minutes after compressor is stopped regardless of the outside temperature 2 Outside temperature is 68 F 20 C or below Outside temperature is monitored hourly and when outside temperature is 68 F 20 C or below pre heat control is turned ON When pre heat control is turned ON compressor is energized about 50 W 40 60 W Compressor and fan are not operated 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 Power ON OFF Compressor ON OFF Defrost thermistor 69 8 F 21 C 30 minutes lt Pre heat ON OFF Breaker ON Start When the defrost _ operation operation thermistor reads 2 Pre heat control ON condition 69 8 F 21 C or more 1 Pre heat control is turned ON for 15 or 30 minutes after the breaker is turned ON 2 30 min after the unit is stopped pre heat control is turned ON for 15 or 30 minutes and turned OFF for 30 minutes This is repeated as shown in the graph until the breaker is turned OFF X When the defrost thermistor r
43. in the rotor Therefore it does not require energy to excite the rotor like AC motor does However it is necessary to control the frequency of 3 phase AC current supplied to the stator accord ing to the polar direction of magnet embedded in the rotor so as to drive the motor efficiently Controlling 3 phase AC current frequency also means controlling the timing to switch the polarity of stator Therefore the polar direction of rotor needs to be detected 2 7 5 Control Method of Rotational speed Sine wave control 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 value of the current running into the motor is determined by each motor characteristic 16 2 8 OPERATIONAL FREQUENCY CONTROL OF OUTDOOR UNIT 1 Outline The operational frequency is as following First the target operational frequency is set based on the difference between the room temperature and the set tempera ture Second the target operational frequency is regulated by discharge temperature protection high pressure protection electric current protection and overload protection and also by the maximum minimum frequency
44. ing for each indoor unit is determined by adding adjustment according to the number of operating unit and the capacity class to standard opening based on the operation frequency e g Opening 120 pulses in standard opening 1 Minimum 70 pulses Maximum 165 pulses Capacity code 4 at 1 unit operation Capacity code 1 at 3 units operation After starting operation opening becomes the one that adjustment according to dis charge temperature was added to basic opening 1 1 LEV opening when the outdoor unit is operating Upper limit 500 pulses Lower limit 53 pulses MXZ 2A 3A30NA 2B 59 pulses MXZ 3A30NA 1 4A 3B 4B 23 t 40 MXZ 2A20NA 3A30NA The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode Discharge Temperature Protection High Pressure Protection Circulation Amount Control Capacity Distribution Evaporation Temperature Protection Exclusive LEV Receiver LEV Exclusive LEV O O Receiver LEV Outdoor heat exchanger Exclusive LEV Indoor heat exchanger Receiver Receiver LEV MXZ 3A30NA COOL mode the two indoor coil thermistors one main sub sense temperature ununiformity super heat at the heat exchanger and when temperature difference develops the indoor coil thermistors adjust LEV opening to dimini
45. itial temperature During operation F 7 2 F High 25225 3 6 F 2 C or more Med Between 0 45 and 3 6 F Low Less than 0 45 F 0 25 C 0 45 F 3 15 0 25 C 1 75 2 Cold air prevention control MSZ A09 12 15 17 MSZ FD MSZ FE MSZ D MSZ GE When the compressor is not operating 1 if the temperature of room temperature thermistor is less than 66 F 19 C the fan stops if the temperature of room temperature thermistor is 66 F 19 C or more and 1 if the temperature of indoor coil thermistor is less than 32 F 0 C the fan stops ii if the temperature of indoor coil thermistor is 32 F 0 or more the fan operates at Very Low When the compressor is operating 1 if the temperature of indoor coil thermistor is 104 F 40 C or more the fan operates at set speed if the temperature of indoor coil thermistor is less than 104 F 40 C and i if heating operation starts after defrosting the fan stops ii if the temperature of room temperature thermistor is 66 F 19 C or less the fan stops iii if the temperature of room temperature thermistor is more than 66 F 19 C the fan operates at Very Low NOTE When 4 minutes MSZ FE18 MSZ GE24 3 minutes Other models have passed since the compressor started operation this control is released regardless of the
46. ment However when coil frost prevention works while the compressor is not operating its speed becomes the set speed 1 3 AUTO VANE OPERATION 1 Horizontal vane ECONO COOL Zi operation ECONOmical operation When ECONO COOL button is pressed COOL mode set temperature is automatically set 3 6 F 2 C higher than that in COOL mode Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger indoor coil thermistor 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 To cancel this operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL or VANE CONTROL button 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 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 minutes when the difference of set temperature and room temperature is more than 3 6 F 2 C the swing operation is performed in table D H for more cooling The air conditioner repeats the swing
47. minutes compared with the previous defrost interval 9 2 Releasing conditions of defrosting Defrosting is released when any one of the following conditions is satisfied a The defrost thermistor continues to read Defrost finish temperature for 30 seconds Refer to CHANGE IN DEFROST SETTING of SERVICE FUNCTIONS in OUTDOOR UNIT SERVICE MANUAL b Defrosting time has exceeded 10 minutes c Any other mode than HEAT mode is set during defrosting Time chart of defrosting in HEAT mode reverse type lt Indoor unit gt horizontal I t positi M Horizontal vane ee 2 horizontal temperature of indoor coil thermistor lt 102 F Set position 39 C Indoor fan i 1 set speed Very Low temperature of indoor coil thermistor gt 64 R set speed OFF 18 C 30 1 seconds lt Outdoor unit gt Maximum frequency Compressor normal f 71 OFF OFF 40 30 40 30 Seconds seconds Seconds seconds i 5 i 5 seconds ON ON Outdoor fan NH OFF ON HEAT ON HEAT 5 OFF COOL eed ers Coo M 2 4 AUTO CHANGE OVER AUTO MODE OPERATION MSZ 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 conditio
48. monic gets increased Harmonic gets suppressed Input voltage 7 Input current Release of energy stored in L Peak gets down iii i Energized time is extended by optimization of L inductance No electricity runs into diode module because the voltage at both sides of smoothing capacitor is higher than input voltage Compulsory energizing by switching 14 4 Intelligent power module INTELLIGENT POWER MODULE consists of the following components IGBT x6 Converts DC waveform to 3 phase AC waveform and outputs it Drive Circuit Drives transistors Protection circuit Protects transistors from overcurrent Since the above components are all integrated in INTELLIGENT POWER MODULE INTELLIGENT POWER MODULE has a merit to make the control circuit simplify and miniaturize 5 Elimination of electrical noise NOISE FILTER CIRCUIT which is formed by CMC COILS and capacitors placed on the POWER P C board eliminates electrical noise of AC power that is supplied to main power supply circuit This circuit also prevents the electrical noise gen erated in the inverter circuit from leaking out CMC COILS Common mode choke coils MUZ A24 MUY A24 MUZ D MUY D MUZ FE18 MUZ GA MUY GA MUZ GE24 MUY GE24 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
49. nning 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 to DC by REACTOR and POWER FACTOR CORRECTION MODULE If the operating frequency becomes 25 Hz or more DC voltage rises to 370 V DC voltage to which has AC been rectified by process is stabilized by SMOOTHING CAPACITOR and supplied to IN TELLIGENT POWER MODULE DC Bus voltage which has been stabilized in process is converted to 3 phase AC by INTELLIGENT POWER MODULE and supplied to COMPRESSOR amp 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 modulation controls impressed voltage and frequency with those pieces of information 21 3 Power factor improvement Booster coil reactor and POWER FACTOR CORRECTION MODULE rectify AC to DC and control its voltage In the motor drive system of sine wave control power factor can be improved by reducing harmonics POWER FACTOR CORRECTION MODULE and reactor stabilize the voltage of DC supplied to inverter circuit and make its waveform smooth 4 Intelligent power module INTELLIGENT POWER MODULE consists of the following components IGBT x6 Converts DC waveform t
50. ns 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 selected 10 a 2 Mode change In case of the following conditions the operation mode is changed COOL mode changes to HEAT mode when 15 minutes have passed with the room temperature 2 4 F 1 2 C below the set temperature HEAT mode changes to COOL mode when 15 minutes have passed with the room temperature 2 4 F 1 2 C above the set temperature In the other cases than the above conditions the present operation mode is continued NOTE Mode selection is performed when multi standby refer to NOTE2 is released and the unit starts operation with ON timer NOTE2 When two or more indoor units are operating simultaneously the indoor unit which is operating in AUTO might not be able to change over the operating mode COOL HEAT and becomes the standby state 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 2 5 OUTDOOR FAN MOTOR CONTROL Fan speed is switched according to the compressor frequency Fan speed Relation between compressor frequency and fan speed High 75 Compressor frequency Hz Down Up MUZ A MUY A Low M
51. o 3 phase AC waveform and outputs it Drive Circuit Drives transistors Protection circuit Protects transistors from over current Since the above components are all integrated in INTELLIGENT POWER MODULE INTELLIGENT POWER MODULE has a merit to make the control circuit simplified and miniaturized 5 Elimination of electrical noise NOISE FILTER CIRCUIT which is formed by CMC COILS NMC COILS and capacitors placed on the P C board eliminates electrical noise of AC power that is supplied to main power supply circuit This circuit also prevents the electrical noise gener ated in the inverter circuit from leaking out CMC COILS Common mode choke coils NMC COILS Normal mode choke coils 3 1 3 Sine wave control In these air conditioners compressor equips brushless DC motor which does not have Hall element In short the motor is sensorless However it is necessary to locate the polar direction of rotor in order to drive brushless DC mo tor efficiently The general detection method of the polar direction for such a DC motor is to locate it from the voltage induced by unenergized stator Therefore it is necessary to have a certain period of time in which the stator is being unenergized for the rotor position detection when the voltage of supplied power is impressed So the motor has been driven by square wave control the conventional motor drive system which energizes the motor only when the range of electrical angle is within 120 beca
52. oad fluctuation the LEV control also works to correct LEV opening degree based on discharge tempera ture Shell temperature of the compressor developing the unit s performance Control range Minimum 33 pulses MUZ A09 12 15 17 MUY A15 17 59 pulses MUZ A24 MUY A24 MUZ GA MUY GA 54 pulses MUZ FD MUZ FE MUZ GE MUY GE 58 pulses MUZ D MUY D Maximum 500 pulses Actuating speed Open 40 pulses second Close 90 pulses second Opening degree adjustment Standard specification 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 Unit OFF LEV remains at maximum opening degree reaches maximum opening degree approximate in 15 minutes after compressor stops Remote controller ON During 1 to 15 minutes after compressor starts LEV is positioned First full closed at zero pulses and then positioned LEV is fixed to standard opening degree according to operational frequen cy of compressor More than about 15 minutes have passed since compressor start up General operation LEV opening degree is corrected to get target discharge temperature of compressor For lower discharge temperature than target temperature LEV is correct ed in closing direction For higher discharge temperature than target temperature LEV is cor rected in opening direction x It may take more than 30 minu
53. odet5or above 3 4 MXZ 4A 4B 6 9 12 15 25 35 30 30 6 9 52 55 65 75 8 12 Receiver LEV Standard opening pulse LEV Opening code 3 4 5 6 7 8 COOL 290 300 310 320 330 340 HEAT 160 170 180 200 224 244 Operation number COOL HEAT Capacity code 3 4 7 9 10 12 Indoor unit 06 09 12 15 17 24 26 sr lt Correction gt D Discharge temperature amp Each correction e Each gas pipe temperature thermistor Minimum gas pipe temperature thermistor 1 Main indoor coil thermistor Sub indoor coil thermistor x 1 Perform this when number of operation units is 2 units or more MXZ 2A20NA and MXZ 3A30NA only x 2 Correct the LEV opening by discharge temperature 1 LEV opening correction by discharge temperature The target discharge temperature is determined according to frequency zone and number of operation unit of the com pressor MXZ 2A20NA Target discharge temperature F C Operation frequency COOL HEAT of compressor Hz Number of operating unit 1 unit 2 units 1 unit 2 units Minimum 23 95 35 136 4 58 122 50 122 50 24 38 104 40 140 60 132 8 56 122 50 39 54 120 2 49 149 65 140 60 132 8 56 55 69 136 4 58 154 4 68 140 60 140 60 70 85
54. on The compressor operational frequency is controlled to prevent the indoor heat exchanger temperature from falling exces sively Compressor is turned OFF for 5 minutes when temperature of indoor coil thermistor continues 37 4 F 3 C or less for 5 minutes or more 33 a0 3 9 DRY OPERATION 1 Thermostat control Thermostat turns ON or OFF by the difference between room temperature and set temperature Thermostat set temperature Initial ON e 3 6 F 2 C or more OFF less than 3 6 F 2 C 2 Coil frost prevention Room temperature minus Coil frost prevention is as same as COOL mode 3 8 2 3 10 HEAT OPERATION 1 Thermostat control Room temperature minus set temperature During operation Thermostat turns ON or OFF by the difference between room temperature and set temperature MXZ 2A 3A 4A Thermostat 2 High pressure protection Room temperature minus set temperature Initial less than 3 6 2 3 6 F 2 C or more Room temperature minus set temperature Initial less than 3 6 F 2 C xen 3 6 F 2 C or more Room temperature minus set temperature During operation Room temperature minus set temperature During operation In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger The compressor opera tional frequency is controlled to prev
55. on of ECONO COOL operation mode the initial airflow 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 minutes when the difference of set temperature and room temperature is more than 35 6 F the swing operation is performed in table D H for more cooling The air conditioner repeats the swing operation in various cycle as follows nes eranen coil thermistor F B sws 8 2 swa 8 v p ewe m F em w s 38 39 218 et s MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2006 MITSUBISHI ELECTRIC CO LTD Distributed in Jan 2011 Distributed in Sep 2010 Distributed in Mar 2010 Distributed in Sep 2009 Distributed in Mar 2009 Distributed in Jul 2008 Distributed in Feb 2008 Distributed in May 2007 Distributed in Apr 2006 Made in Japan o No No No No No No No No OBT16 REVISED EDITION H OBT16 REVISED EDITION G 6 OBT16 REVISED EDITION F 6 OBT16 REVISED EDITION E 5 OBT16 REVISED EDITION D 4 OBT16 REVISED EDITION C 6 OBT16 REVISED EDITION B 6 OBT16 REVISED EDITION A 7
56. per heat of the unit from the expression below Super heat Each gas pipe temperature Minimum gas pipe temperature Q Separate correction is performed according to each super heat in the table below Discharge temperature F C MXZ 2A20NA MXZ 3A30NA ops LEV opening opo LEV opening Superheat F C correction pulse Sup rheat Foo correction pulse More than 16 2 9 3 More than 16 2 9 12 10 8 6 to 16 2 9 2 10 8 6 to 16 2 9 5 4 3 to 10 8 6 1 5 4 3 to 10 8 6 5 4 3 or less 0 5 4 3 or less 28 a0 b Correct the LEV separately by temperature difference ART between main sub indoor coil thermistor LEV opening correction pulse ART F C 10 8 6 ART 7 2 4 5 ART lt 10 8 6 ART lt 7 2 4 In addition decrease the target discharge temperature corresponding ART Temperature to be I decreased F C 10 8 6 ART 18 10 7 2 4 ART 10 8 6 9 5 ART 7 2 4 9 5 3 3 OPERATIONAL FREQUENCY RANGE MXZ 2A20NA Number of operating unit COOL Hz HEAT Hz Min Max Defrost 4 20 65 92 92 7 20 85 92 92 20 12 20 30 30 30 20 Capacity code MXZ 2A20NA Number of operating unit Capacity code 4 7 12 MXZ 2A20NA 2 Number of operating unit
57. sed and the unit starts operation with ON timer NOTE2 When two or more indoor units are operating simultaneously the indoor unit which is operating in AUTO i1 might not be able to change over the operating mode COOL HEAT and becomes the standby state 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 4 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 feed back 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 With this control when the fan speed is switched the rotational frequency changes smoothly Rotational frequency Super High Super High time 2 Fan motor lock up protection When the rotational frequency feedback signal has not output for 12 seconds or when the microprocessor cannot detect the signal for 12 seconds energizing to the fan motor is stopped Then the microprocessor retries detection 3 times every 30 seconds If the microprocessor still cannot detect the signal the fan motor is regarded locked up
58. sh the super heat This action is called Evaporation Temperature Protection The opening pulse of the Receiver LEV is fixed to the standard No 3 in cooling operation and so is that of each Exclusive LEV in heating operation However the 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 lt MXZ 2A20NA gt Number of LEV opening pulse operating indoor units 2 units 1 unit Standard No 2 units 150 120 120 320 140 140 360 160 160 410 220 220 500 280 lt MXZ 3A30NA gt Number of LEV opening pulse 280 operating indoor units COOL HEAT 2 units 3 units 1 unit Standard No 2 units 3 units 250 250 250 250 250 320 320 300 300 300 360 370 450 380 380 410 420 460 400 390 460 470 470 24 450 440 Determination of LEV standard opening in each indoor unit standard opening is on the straight line which connects an each standard point the section where divided into seven according to the operation frequency of compressor as shown in the
59. suesssosse osuesusvuueusuessueussscsussesesVveossue sssee 33 3 9 DRY OPERATION PESPPHECECCLTEECTECOLETECEEITEROLECETERPECCLLTECLECHLEPRT ECHTE TCOEECEEHREEERLTT EC ET ETT TTEEERLLEPOTT EE ETECECO EUR TERLTEEEETCLEEEOLT CCLEDCEERETT ERES 34 3 10 HEAT OPERATION 34 4 MICROPROCESSOR CONTROL TNRSERRERSRRRREARERRENERERERRAERARARERRREREENREREENCRNESSFGRAREERRNMMEEKCRBEEFERNERRERARREARRESRNNUNNERENAREER AS 35 Indoor unit models MFZ KA09NA MFZ KA12NA MFZ KA18NA 4 1 COOL OPERATION 35 4 2 DRY OPERATION VGRRRRRRRRSKRRRRWERWRERSRRORRSREGRERERCERESRRRUEESKEESERWRERRERERWSNROREGFRFRREREARRRUESOREQIRGEREREKRRESERRKERRRRRKSRWOEESNRERREKRRWRNOEEG 35 4 3 HEAT OPERATION 36 4 4 AUTO CHANGE OVER ST AUTO MODE OPERATION 37 4 5 INDOOR FAN MOTOR CONTROL WSRMUNESEERREEFAEFEVWRFURESEKENREEREENRRRRESRENENRKRFRENZRERRANSEEEERARNREENERREREEENMENRNEEFREAREREREFRRERE 37 4 6 AUTO VANE OPERATION TC TERT COCCI 38 1 MICROPROCESSOR CONTROL E 1 1 COOL OPERATION 1 Thermostat control Thermostat turns ON or OFF by the difference between room temperature and set temperature Room temperature minus Room temperature minus Thermostat set temperature Initial set temperature During operation ON 1 8 F 1 C or more OFF less than 1 8 F 1 C a 1 8
60. tes to reach target temperature depend ing on operating conditions Thermostat OFF Thermostat ON LEV is adjusted to exclusive opening degree for thermostat OFF LEV is controlled in the same way as that after the compressor has started up Defrosting in HEAT mode 2 Time chart Air conditioner ON LEV is adjusted to open 500 pulses Air conditioner OFF thermostat off Positioning Opening degree is corrected according to discharge Standard temperature Commanded opening Refer to 3 to open amp degree 1 2 gt an 1 1 About 15 minutes Time O gt MW e 62 0 V ck C o f co i 1 Lo i ss i e ON OFF Time 18 a0 3 Control data 23 38 53 69 84 99 Hz MUZ FE18 MUZ GE24 MUY GE24 30 50 70 90 110 130 Hz Other models Operational frequency of the compressor Target discharge temperature Reference value of target discharge temperature COOL HEAT MUZ F C Applied model A B D E F 122 50 127 53 140 60 151 66 158 70 158 70 113 45 126 52 138 59 154 68 169 76 169 76 129 54 136 58 147 64 158 70 158 70 158 70 120 49 136 58 151 66 165 74 180 82 185 85 140 60 140 60 140 60 145 63 147 64 153 67 140 60 145 63 149 65 153 67 158 70 158 70 120 49 131 55
61. use it is forced to be unenergized within 30 at start and end of one heap in one waveform cycle 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 3 1 4 Characteristics of sine wave control in case of brushless DC motor e Although ordinary 3 phase induction motor requires energy to excite the magnetic field of rotor brushless DC motor does not need it So higher efficiency and torque are provided e This control provides the most efficient waveform corresponding to the rotational speed of compressor 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 less energy 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 e Since the response and efficiency of motor are enhanced in sine wave control finer adjustment can be provided DC Motor AC Motor Rotor Permanent magnet is embedded Excited by magnetic field of stator Rotor Position Signal Necessary Unnecessary

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