OBT14A--1qxp 06.1.12 1:07 PM Page 1 Revision A: ● MSZ-GA80VA has been added. ● MUZ-GA•VA - A has been added. ● MXZ-A•VA - A has been added. SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS FLOOR TYPE, HEAT PUMP AIR CONDITIONERS Please void OBT14. No. OBT14 REVISED EDITION-A SERVICE TECHNICAL GUIDE Wireless type Models MSZ-FA•VA - · MUZ-FA•VA MSZ-GA•VA - · MUZ-GA•VA MFZ-KA•VA A A A A A Inverter-controlled multi system type Models · MXZ-A•VA - A CONTENTS 1. 2. 3. 4.
OBT14A--1qxp 06.1.12 1:07 PM Page 2 Revision A: • MSZ-GA80VA has been added. • MUZ-GA•VA - A has been added. • MXZ-A•VA - A has been added. 1. MSZ-FA MICROPROCESSOR CONTROL ···················································4 MSZ-FA·VA Indoor unit models Outdoor unit models MSZ-FA25VA MUZ-FA25VA MSZ-FA35VA MUZ-FA35VA ( As for outdoor unit MXZ-8A140VA, refer to service manual OC316. 1-1. COOL OPERATION ··············································································5 1-2.
OBT14A--1qxp 06.1.12 1:07 PM Page 3 3. MFZ MICROPROCESSOR CONTROL ·······················································50 MFZ-KA·VA Indoor unit models As for outdoor units SUZ-KA25VA.TH, SUZ-KA35VA.TH and SUZ-KA50VA.TH, refer to service manual OC323. 3-1. COOL OPERATION·············································································51 3-2. DRY OPERATION ···············································································52 3-3.
OBT14A--1qxp 1 06.1.12 1:07 PM Page 4 MSZ-FA MICROPROCESSOR CONTROL MSZ-FA25VA MUZ-FA25VA MSZ-FA35VA MUZ-FA35VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of remote controller model (This diagram shows an overall view.) (This diagram shows an overall view.
OBT14A--1qxp 06.1.12 1:07 PM 1-1. COOL ( Page 5 ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. POWER lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper1. Thermostat control ature during operation.
06.1.12 1:07 PM 1-2. DRY ( Page 6 Set temperature and : initial room temperature in dry mode 35 ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. POWER lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature. Set temperature is as shown on the right chart.
OBT14A--1qxp 06.1.12 1:07 PM Page 7 3. High pressure protection In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor operational frequency is controlled to prevent the condensing pressure from increasing excessively. 4. Overload starting When the room temperature thermistor RT11 reads 18°C or more, the compressor runs with its maximum frequency regulated for 10 minutes after the start-up. 5.
OBT14A--1qxp 06.1.12 1:07 PM Page 8 1-4. 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. 1 If the room temperature thermistor RT11 reads more than set temperature, COOL mode is selected.
OBT14A--1qxp 06.1.12 1:07 PM Page 9 1-7. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximate 12V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
OBT14A--1qxp 06.1.12 1:07 PM Page 10 (9) To change the air flow direction not to blow directly onto your body. To change the air flow direction Pressing and holding VANE CONTROL button for 2 seconds or more causes the horizontal vane to reverse and move to horizontal position. When to use this function? COOL/DRY HEAT Use this function if you don’t want the air from the indoor unit to blow directly onto your body. • Depending on the shape of the room,the air may blow directly onto your body.
OBT14A--1qxp 06.1.12 1:07 PM Page 11 2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximate 12V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.
OBT14A--1qxp 06.1.12 1:07 PM 1-9. AREA ( Page 12 ) SETTING (1) Press OPERATE / STOP (ON/ OFF)button to start the air conditioner. (2) Press i-see button. (NOTE 1) (3) Press AREA button. Each time the button is pressed, the area is changed in sequence: (AUTO) (LEFT) (RIGHT) Cancel i-see Sensor moves intermittenly, measuring the floor and wall temperature. NOTE1: AREA setting is only available during i-see control operation.
OBT14A--1qxp 06.1.12 1:07 PM Page 13 (4) AREA setting is cancelled when the "cancel" is sellected by pressing AREA button, or when WIDE VANE button is pressed. Indoor unit installation location and air-conditioning area Installed at left LEFT · Installed at center RIGHT LEFT Installed at right RIGHT LEFT RIGHT Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit.
OBT14A--1qxp 06.1.12 1:07 PM 1-10. PLASMA DUO ( Page 14 ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Press PLASMA button to set PLASMA DUO operation. Each time this button is pressed, the operation mode of PLASMA is changed in sequence: Cancel (The sign of PLASMA operation disappears .) PLASMA/WASH lamp Lighted Not lighted PLASMA/WASH lamp turns on in the display section of the indoor unit and PLASMA DEODORIZING and/or PLASMA AIR PURIFYING unit is energyzed.
OBT14A--1qxp 06.1.12 1:07 PM Page 15 1-11. AUTO FRONT PANEL When the unit starts operating, the front panel opens automatically to draw in air. When the unit stops operating, the front panel closes automatically. Open Closed Operation and operating range of the auto front panel The front panel fully opens 10 mm or more upper than the level line of the top end of the nozzle assembly. It takes about 13 seconds to open the front panel completely. 10 mm or more Z-Z Side view 1-12. TIMER OPERATION 1.
OBT14A--1qxp 06.1.12 1:07 PM Page 16 PROGRAM TIMER • The OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first. • “ ” and “ ” display shows the order of the OFF timer and the ON timer operation. (Example 1) The current time is 8:00 PM. (Example 2) The current time is 11:00 AM. The unit turns off at 11:00 PM, and on at 6:00 AM. The unit turns on at 5:00 PM, and off at 9:00 PM.
OBT14A--1qxp 06.1.12 1:07 PM Page 17 1-14. INVERTER SYSTEM CONTROL 1-14-1. Inverter main power supply circuit POWER P.C. BOARD L62 INVERTER P.C. BOARD L61 L63 Power supply DB61 U P + C63A C63B V C63C N W R64A R64B X64 CT CT761 IPM CT781 U W MC V TR821 DB65 Booster chopper circucuit Function of main parts NAME SYMBOL IPM INTELLIGENT POWER MODULE FUNCTION It supplies three-phase AC power to compressor. C63A/C63B/C63C SMOOTHING CAPACITOR It stabilizes the DC voltage.
OBT14A--1qxp 06.1.12 1:07 PM Page 18 3. Purpose of PAM adoption PAM : Pulse Amplitude Modulation PAM has been adopted for the efficiency improvement and the adaptation to IEC harmonic current emission standard. Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor.
OBT14A--1qxp 06.1.12 1:07 PM Page 19 1-14-3. Characteristics of sine wave control in case of brushless DC motor ● Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. ● This control provides the most efficient waveform corresponding to the rotation times of compressor motor. ● The rotation can be set to higher compared to the conventional motor drive system.
OBT14A--1qxp 06.1.12 1:07 PM Page 20 1-16. EXPANSION VALVE CONTROL (LEV CONTROL) standard specification (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each operational frequency of the compressor.
OBT14A--1qxp 06.1.12 1:07 PM Page 21 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON LEV opening degree Positioning Opening degree is corrected according to discharge temperature.
OBT14A--1qxp 2 06.1.12 1:07 PM Page 22 MSZ-GA MICROPROCESSOR CONTROL MSZ-GA22VA MSZ-GA25VA MUZ-GA25VA MSZ-GA35VA MUZ-GA35VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of remote controller model is on back (This diagram shows an overall view.
OBT14A--1qxp 06.1.12 1:07 PM 2-1. COOL ( Page 23 ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper1. Thermostat control ature during operation.
06.1.12 1:07 PM 2-2. DRY ( Page 24 Set temperature and : initial room temperature in dry mode 35 ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature. Set temperature is as shown on the right chart.
OBT14A--1qxp 06.1.12 1:07 PM Page 25 3. High pressure protection In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor operational frequency is controlled to prevent the condensing pressure from increasing excessively. 4. Overload starting When the room temperature thermistor RT11 reads 18°C or more, the compressor runs with its maximum frequency regulated for 10 minutes after the start-up. 5.
OBT14A--1qxp 06.1.12 1:07 PM Page 26 Time chart of defrosting in HEAT mode (reverse type) horizontal Horizontal vane set position Indoor fan set speed set position Very Low (temperature of indoor coil thermistor > 18:) OFF set speed 30 seconds Maximum frequency Compressor normal OFF 40 30 seconds seconds OFF 40 seconds 5 seconds 30 seconds ON 5 seconds ON Outdoor fan OFF R.V. coil (21S4) ON (HEAT) ON (HEAT) OFF (COOL) 2-4.
OBT14A--1qxp 06.1.12 1:07 PM Page 27 2-5. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (Super High, High, Med., Low), the microprocessor adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
OBT14A--1qxp 06.1.12 1:07 PM Page 28 (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum room-temperature distribution. (1) In COOL and DRY operation Vane angle is fixed to Horizontal position. Horizontal position Vane angle is fixed to Angle 4. (2) In HEAT operation (5) STOP (operation OFF) and ON-TIMER standby When the following cases occur, the horizontal vane returns to the closed position.
OBT14A--1qxp 06.1.12 1:07 PM Page 29 (10) ECONO COOL ( ) operation (ECONOmical operation) When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12). SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that in COOL mode, the air conditioner can keep comfort.
OBT14A--1qxp 06.1.12 1:07 PM Page 30 PROGRAM TIMER • OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first. • “ ” and “ ” display shows the order of OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM. (Example 2) The current time is 11:00 AM. The unit turns off at 11:00 PM, and on at 6:00 AM. The unit turns on at 5:00 PM, and off at 9:00 PM.
OBT14A--2qxp 06.1.12 1:08 PM Page 31 2-10. INVERTER SYSTEM CONTROL 2-10-1. Inverter main power supply circuit POWER P.C. BOARD L62 INVERTER P.C. BOARD L61 L63 Power supply DB61 U P + C63A C63B V C63C N W R64A R64B X64 CT CT761 IPM CT781 U W MC V TR821 DB65 Booster chopper circucuit Function of main parts NAME SYMBOL IPM INTELLIGENT POWER MODULE FUNCTION It supplies three-phase AC power to compressor. C63A/C63B/C63C SMOOTHING CAPACITOR It stabilizes the DC voltage.
OBT14A--2qxp 06.1.12 1:08 PM Page 32 3. Purpose of PAM adoption PAM : Pulse Amplitude Modulation PAM has been adopted for the efficiency improvement and the adaptation to IEC harmonic current emission standard. Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor.
OBT14A--2qxp 06.1.12 1:08 PM Page 33 2-10-3. Characteristics of sine wave control in case of brushless DC motor ● Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. ● This control provides the most efficient waveform corresponding to the rotation times of compressor motor. ● The rotation can be set to higher compared to the conventional motor drive system.
OBT14A--2qxp 06.1.12 1:08 PM Page 34 2-12. EXPANSION VALVE CONTROL (LEV CONTROL) MSZ-GA35 standard specification (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each operational frequency of the compressor.
OBT14A--2qxp 06.1.12 1:08 PM Page 35 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON LEV opening degree Positioning Opening degree is corrected according to discharge temperature.
OBT14A--2qxp 06.1.12 1:08 PM Page 36 MSZ-GA50VA MSZ-GA60VA MUZ-GA50VA MUZ-GA60VA MSZ-GA71VA MSZ-GA80VA MUZ-GA71VA MUZ-GA80VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button TOO ON/OFF WARM TOO COOL TEMPERATURE buttons Indication of remote controller model is on back.
OBT14A--2qxp 06.1.12 1:08 PM Page 37 2. Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button Difference between room regardless of the thermostat’s OFF-ON. temperature and set temperaIn AUTO the fan speed is as follows. Initial temperature difference Fan speed ture during operation ( T) Room temperature minus set temperature : 1.7 : or more ········································High Room temperature minus set temperature : Between 1 and 1.
OBT14A--2qxp 06.1.12 1:08 PM Page 38 Difference between room temperature and set tem1. Thermostat control perature during operation Thermostat is ON or OFF by difference between room temperature and set temperature. Initial temperature difference Thermostat Set temperature Room temperature minus set temperature : -1.0 : or more··············································ON Room temperature minus set temperature : less than -1.0 :············································OFF -1.0 : -0.7 : 2.
OBT14A--2qxp 06.1.12 1:08 PM Page 39 3. High pressure protection In HEAT operation the indoor coil thermistor detects the temperature of the indoor heat exchanger. The compressor operational frequency is controlled to prevent the condensing pressure from increasing excessively. 4. Overload starting When the room temperature thermistor RT11 reads 18°C or more, the compressor runs with its maximum frequency regulated for 10 minutes after the start-up. 5.
OBT14A--2qxp 06.1.12 1:08 PM Page 40 2-16. AUTO CHANGE OVER ··· AUTO MODE OPERATION Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation. 1. Mode selection (1) Initial mode At first indoor unit operates only indoor fan with outdoor unit OFF for 3 minutes to detect present room temperature. Following the conditions below, operation mode is selected. 1 If the room temperature thermistor RT11 reads more than set temperature, COOL mode is selected.
OBT14A--2qxp 06.1.12 1:08 PM Page 41 2-18. OUTDOOR FAN MOTOR CONTROL Fan speed is switched according to the compressor frequency. Fan speed Down Up High Low Min. Compressor frequency Max. Mode Fan speed COOL HEAT Indoor unit operation MUZ-GA50/60 MUZ-GA71/80 Up 44Hz 54Hz Down 33Hz 39Hz Up 52Hz 54Hz Down 42Hz 39Hz 2-19. AUTO VANE OPERATION 1.
OBT14A--2qxp 06.1.12 1:08 PM Page 42 (7) SWING MODE ( ) By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. The remote controller displays “ ”. SWING mode is cancelled when VANE CONTROL button is pressed once again. (8) Cold air prevention in HEAT operation. When any of the following conditions occurs in HEAT operation, the vane angle changes to Horizontal position automatically to prevent cold air blowing on users. ① Compressor is not operating.
OBT14A--2qxp 06.1.12 1:08 PM Page 43 (10) LONG MODE ( ) By pressing LONG button indoor fan speed becomes faster than setting fan speed on the remote controller, and the horizontal vane moves to the position for LONG mode. The remote controller displays “ ”. LONG mode is cancelled when LONG button is pressed once again or VANE button is pressed or ECONO COOL button is pressed in COOL mode. • In the following example, the vertical vane is set to (front.).
OBT14A--2qxp 06.1.12 1:09 PM Page 44 2-20. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button. START (3) Press ON-TIMER button( ) to set ON timer.
OBT14A--2qxp 06.1.12 1:09 PM Page 45 2-21. EMERGENCY / TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote controller run down. The unit will start and OPERATION INDICATOR lamp will light. The first 30 minutes of operation is the test run operation. This operation is for servicing.
OBT14A--2qxp 06.1.12 1:09 PM Page 46 2-22-2. Outline of main power supply circuit 1. At the start of operation Main power supply circuit is formed when X64 (Relay) is turned ON at compressor startup. To prevent rush current from running into the circuit when power supply is turned ON, R64A and R64B (Current-limiting resistor) are placed in sub circuit. 2. At normal operation 1 When AC runs into noise filter P.C. board, its external noise is eliminated in the noise filter circuit.
OBT14A--2qxp 06.1.12 1:09 PM Page 47 2-22-4. Characteristics of sine wave control in case of brushless DC motor ● Although ordinary three-phase induction motor requires energy to excite the magnetic field of rotor, brushless DC motor doesn't need it. So, higher efficiency and torque are provided. ● This control provides the most efficient waveform corresponding to the rotation times of compressor motor. ● The rotation can be set to higher compared to the conventional motor drive system.
OBT14A--2qxp 06.1.12 1:09 PM Page 48 2-24. EXPANSION VALVE CONTROL (LEV CONTROL) standard specification (1) Outline of LEV control The LEV basic control is comprised of setting LEV opening degree to the standard opening degrees set for each operational frequency of the compressor.
OBT14A--2qxp 06.1.12 1:09 PM Page 49 (2) Time chart Air conditioner OFF (thermostat off) Air conditioner ON LEV opening degree Positioning Opening degree is corrected according to discharge temperature.
OBT14A--2qxp 3 06.1.12 1:09 PM Page 50 MFZ MICROPROCESSOR CONTROL MFZ-KA25VA MFZ-KA35VA MFZ-KA50VA WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Indication of remote controller model is on back Open the front lid. ra shows an overall verall view.) .) (This diagram view.
OBT14A--2qxp 06.1.12 1:09 PM 3-1. COOL ( Page 51 ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature. The setting range is 16 ~ 31°C Difference between room temperature and set temper1. Thermostat control ature during operation.
06.1.12 1:09 PM 3-2. DRY ( Page 52 ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set temperature. Set temperature is as shown on the right chart. The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature.
OBT14A--2qxp 06.1.12 1:09 PM Page 53 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. Fan speed Initial temperature difference Set temperature minus room temperature: 2 : or more ·················································· High Set temperature minus room temperature: Between 0.2 and 2 : ································· Med. Set temperature minus room temperature: less than 0.
OBT14A--2qxp 06.1.12 1:09 PM Page 54 Time chart of defrosting in HEAT mode (reverse type) vertical Horizontal vane set position Indoor fan (upper) Indoor fan (lower) set speed set position Very Low (temperature of indoor coil thermistor > 18:) OFF set speed 30 seconds ON ON OFF Damper OPEN or CLOSE OPEN or CLOSE CLOSE Maximum frequency Compressor normal OFF 40 30 seconds seconds Outdoor fan OFF 40 seconds 5 seconds 30 seconds ON 5 seconds ON OFF R.V.
OBT14A--2qxp 06.1.12 1:09 PM Page 55 3-5. INDOOR FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (Super High, High, Med., Low), the microprocessor adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
OBT14A--2qxp 06.1.12 1:09 PM Page 56 (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum room-temperature distribution. (1) In COOL and DRY operation 1 1 2 Vane angle is fixed to Angle 1. (2) In HEAT operation 3 4 5 4 When air comes out from upper air outlet, vane angle is fixed to Angle 4. 2 When air comes out from upper and lower air outlets, vane angle is fixed to Angle 2.
OBT14A--2qxp 06.1.12 1:09 PM Page 57 (9) Damper operation NOTE 1 : Be sure to turn off the air conditioner before changing the switch setting. With this function, air comes out simultaneously from the upper and lower air outlets so that the room can be cooled or heated effectively. This function is set using the switch behind the front grille of the indoor unit. (This function is available in cooling and heating operation.) 1.How to set to blow out air from the upper 2.
OBT14A--2qxp 06.1.12 1:09 PM Page 58 (10) EMBEDDED INDOOR UNIT SETTING (MUST BE PERFORMED) • When installing a grating, use a grating with narrow upper and lower horizontal bars so that the airflow from the upper and lower air outlets does not contact the bars. If the horizontal bars will block the lower air outlet, use a stand, etc., to adjust the height of the indoor unit. If the upper or lower air outlet is blocked, the air conditioner will not be able to cool or warm the room well.
OBT14A--2qxp 06.1.12 1:09 PM Page 59 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.
OBT14A--2qxp 06.1.12 1:09 PM Page 60 3-9. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button. ON timer setting START (1) Press ON-TIMER button( ) to set ON timer.
OBT14A--3qxp 06.1.12 1:10 PM Page 61 3-10. EMERGENCY / TEST OPERATION In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down. The unit will start and OPERATION INDICATOR lamp will light. The first 30 minutes of operation is the test run operation. This operation is for servicing.
OBT14A--3qxp 06.1.12 1:10 PM 4 Page 62 MXZ MICROPROCESSOR CONTROL MXZ-2A52VA MXZ-4A71VA MXZ-3A54VA MXZ-4A80VA 4-1. INVERTER SYSTEM CONTROL 4-1-1. MXZ-2A52VA 4-1-1-1. Inverter main power supply circuit POWER P.C. BOARD L61 L62 INVERTER P.C.
OBT14A--3qxp 06.1.12 1:10 PM Page 63 Outline of simple partial switching method In conventional inverter models, diode module rectifies AC voltage to DC voltage, smoothing capacitor makes its DC waveform smooth, and IPM converts its DC voltage to imitated AC voltage again in order to drive the compressor motor. 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.
OBT14A--3qxp 06.1.12 1:10 PM Page 64 Rotor DC Motor Permanent magnet is embedded. AC Motor Excited by magnetic field of stator Rotor Position Signal Necessary Unnecessary w In brushless DC motor, permanent magnet is embedded in the rotor. Therefore, it doesn't require energy to excite the rotor like AC motor does.
OBT14A--3qxp 06.1.12 1:10 PM Page 65 3. Power factor improvement Booster coil L (Reactor) and PFC 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 PFC and L (Reactor) stabilize the voltage of DC supplied to inverter circuit and make its waveform smooth. 4. Power transistor module IPM consists of the following components. · Power Transistors (x6): Converts DC waveform to three-phase AC waveform and outputs it.
OBT14A--3qxp 06.1.12 1:10 PM Page 66 4-2. EXPANSION VALVE CONTROL (LEV CONTROL) Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. LEV opening Indoor unit status Stop of all indoor unit Opening before stop ➝ 500 pulse in 15 minutes When outdoor unit is operating, some indoor units stop and some operate.
OBT14A--3qxp 06.1.12 1:10 PM Page 67 MXZ-3A/4A The table below shows the role of Exclusive LEV and Receiver LEV in each operation mode.
OBT14A--3qxp 06.1.
OBT14A--3qxp 06.1.12 1:10 PM Page 69 1 Discharge temperature 2 Each correction • (Each gas pipe temperature thermistor - Minimum gas pipe temperature thermistor)w 1 • (Main indoor coil thermistor - Sub indoor coil thermistor) COOL DRY HEAT • • • • • w2 w2 - w 1 Perform this, when number of operation units is 2 units or more. MXZ-2A52VA is excluded. w 2 Correct the LEV opening by discharge temperature.
OBT14A--3qxp 06.1.12 1:10 PM Page 70 Correct the LEV opening according to the difference between target discharge temperature and discharge temperature.
OBT14A--3qxp 06.1.12 1:10 PM Page 71 b) Correct the LEV separately by temperature difference “ RT LEV opening correction (pulse) 6[ RT 4[ RT< 6 RT<4 2 1 0 RT” between main/sub indoor coil thermistor. In addition, decrease the target discharge temperature corresponding RT Temperature to be decreased (:) 6[ RT 4[ RT< 6 RT<4 -10 -5 -5 RT. 4-3.
OBT14A--3qxp 06.1.12 1:10 PM Page 72 MXZ-4A80VA Number of operating unit 1 2 3 4 Capacity code 1, 2, 3, 4 5, 6 7, 8 9, 10 11, 12 13, 14 15 or above 2, 3, 4, 5, 6, 7 8, 9, 10 11, 12, 13 14, 15, 16 17, 18, 19, 20, 21 22, 23, 24 or above 3, 4, 5, 6, 7, 8, 9, 10 11, 12, 13, 14, 15 16, 17, 18, 19, 20 21, 22, 23, 24, 25 26, 27, 28, 29 30 or above 4, 5, 6, 7, 8, 9, 10 11, 12, 13, 14, 15 16, 17, 18, 19, 20 21, 22, 23, 24, 25 26, 27, 28, 29, 30 31, 32, 33, 34, 35 36 or above COOL (Hz) Min. Max.
OBT14A--3qxp 06.1.12 1:10 PM Page 73 4-7. OUTDOOR FAN CONTROL Fan speed is switched according to the number of operating indoor unit and the compressor frequency. Fan speed Down High Up Low Min. Compressor frequency Max. Mode COOL HEAT Fan speed Compressor frequency Up 40Hz Down 30Hz Up 40Hz Down 30Hz Note • When the indoor coil thermistor is 57: or more on HEAT operation, fan speed is fixed to Low speed.
OBT14A--3qxp 06.1.12 1:10 PM Page 74 HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2006. No. OBT14 REVISED EDITION-A 7 Distributed in Aug. 2005. No. OBT14 8 Made in Japan New publication, effective Jan. 2006 Specifications subject to change without notice.
