Outdoor unit modelMUZ-GE09NA MUY-GE09NA MUZ-GE12NA MUY-GE12NA
Capacity
Rated (Minimum~Maximum)
CapacityHeating 17 2Btu/h8,700—
Power consumption
Rated (Minimum~Maximum)
Power consumptionHeating 17
EER
HSPF IV
COP Heating
Power supplyV , phase , Hz208/230 , 1 , 60
Max. fuse size (time delay)A15
Min. circuit ampacity A 12121212
Fan motor F.L.A 0.50
Compressor
Refrigerant control Linear expansion valve
Sound level
Defrost method Reverse cycle
Dimensions
Weight Ib. 66 77
External fi nishMunsell 3Y 7.8/1.1
Remote controller Wireless type
Control voltage
Refrigerant piping Not supplied
Refrigerant pipe size
(Min. wall thickness)
Connection method
Between the indoor &
outdoor units
Refrigerant charge (R410A) 1 lb. 12 oz.2 lb. 9 oz.
NOTE: Test conditions are based on AHRI 210/240.
1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB) Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB Rated frequency
2: (Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB Maximum frequency
Indoor air condition (°F)Outdoor air condition (°F)
Dry bulbWet bulbDry bulb Wet bulb
806795(75)
806782(65)
806782(65)
806767(53.5)
806787(69)
70604743
70601715
70606256.5
70604743
70603533
3-1. OPERATING RANGE
(1) POWER SUPPLY
Outdoor unit
(2) OPERATION
ModeCondition
Standard temperature806795—
Cooling
Heating
(MUZ)
Maximum temperature9073115—
Minimum temperature675714—
Maximum humidity78 %—
Standard temperature70604743
Maximum temperature80677565
Minimum temperature7060-4-5
NOTE: 1. IDB: Intake air dry-bulb temperature
TC: Total Capacity (x10
3
Btu/h)
TPC: Total Power Consumption (kW)
2. Above data is for heating operation without any frost.
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL
mode or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts with operational frequency.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30 minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on
the remote controller.
7-2. PERFORMANCE CURVE
Cooling
1.5
1.4
1.3
1.2
1.1
difference (°F)
1.0
Capacity correction factors
0.9
Indoor air Wet-bulb temperature
14233241505968778695104 113
Cooling capacity (
Outdoor intake air Dry-bulb temperature(°F)
at Rated frequency)
Indoor intake air Wet-bulb
temperature( F)
79
75
72
68
64
MUZ-GE09NA
MUY-GE09NA
SHF at rating condition = 0.76
0.8
0.7
Indoor
(kW)
0.6
0.5
Total power consumption
65758595105115
Outdoor intake air DB temperature (°F)
e air WB temperat
intak
Airflow
= 307 CFM
ure (°F)
MUZ-GE12NA
MUY-GE12NA
SHF at rating condition = 0.73
1.3
71
67
63
1.2
1.1
1.0
(kW)
0.9
0.8
0.7
Total power consumption
oor intake air WB temperature (°F)
Ind
65758595105115
Outdoor intake air DB temperature (°F)
19
Airflow
= 350 CFM
71
67
63
Page 20
75
70
65
Indoor intake air DB temperature (°F)
= 413 CFM
Airflow
155253545556570
Outdoor intake air WB temperature (°F)
0.4
0.6
0.8
1.0
1.1
Total power consumption
(kW)
Indoor air Dry-bulb temperature
difference (°F)
Outdoor intake air Wet-bulb temperature (°F)
-4 5 142332415059
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Heating capacity (
at Rated frequency)
Capacity correction factor
59
68
79
Indoor intake air Dry-bulb temperature
( F)
MUZ-GE15NA
MUY-GE15NA
1.4
1.3
1.2
1.1
(kW)
1.0
0.9
0.8
Total power consumption
SHF at rating condition = 0.80
Indoor intake air WB temperature (°F)
65758595105115
Outdoor intake air DB temperature (°F)
Airflow
= 498 CFM
MUZ-GE24NA
MUY-GE24NA
SHF at rating condition = 0.75
2.2
2.1
2.0
1.9
1.8
1.7
(kW)
1.6
1.5
1.4
Total power consumption
1.3
65758595105115
Indoor intake air WB temperature (°F)
Outdoor intake air DB temperature (°F)
Airflow
= 634 CFM
Heating (MUZ)
MUZ-GE18NA
MUY-GE18NA
SHF at rating condition = 0.71
2.0
71
67
63
71
67
63
1.9
1.8
1.7
1.6
(kW)
1.5
1.4
1.3
Total power consumption
65758595105115
Indoor intake air WB temperature (°F)
Outdoor intake air DB temperature (°F)
Airflow
= 498 CFM
71
67
63
MUZ-GE09NA
MUZ-GE12NA
1.4
1.3
1.2
1.1
1.0
0.9
(kW)
0.8
0.7
0.6
Total power consumption
0.5
This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships
between frequency and capacity.
155253545556570
= 413 CFM
Airflow
Indoor intake air DB temperature (°F)
Outdoor intake air WB temperature (°F)
MUZ-GE15NA
= 463 CFM
1.9
75
70
65
1.8
1.5
1.2
(kW)
0.9
Total power consumption
0.6
155253545556570
Outdoor intake air WB temperature (°F)
20
Airflow
oor intake air DB temperature (°F)
Ind
75
70
65
Page 21
21
68 707580859095100 105
(°F)
120
140
160
180
200
(PSIG)(PSIG)
687075808590
95
100 105
(°F)
280
320
360
400
440
Condensing pressure
86
80
75
70
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
Outdoor ambient temperature
Indoor DB temperature (°F)
86
80
75
70
MUZ-GE18NA
2.1
1.9
1.7
1.5
1.3
(kW)
1.1
0.9
0.7
Total power consumption
0.5
155253545556570
= 463 CFM
Airflow
Indoor intake air DB temperature (°F)
Outdoor intake air WB temperature (°F)
75
70
65
MUZ-GE24NA
2.8
2.5
2.2
1.9
(kW)
1.6
1.3
Total power consumption
1.0
5 15253545556570
= 738 CFM
Airflow
Outdoor intake air WB temperature (°F)
This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships
between frequency and capacity.
7-3. CONDENSING PRESSURE
Cooling
Data is based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-GE09NA MUY-GE09NA
75
70
65
MUZ-GE12NA MUY-GE12NA
(PSIG)
420
380
340
Condensing pressure
300
260
Indoor DB temperature (°F)
687075808590
Outdoor ambient temperature
95
100 105
(PSIG)
86
80
75
70
190
170
150
Suction pressure
Indoor DB temperature (°F)
130
(°F)
110
687075808590
Outdoor ambient temperature
95
100 105
86
80
75
70
(°F)
Page 22
MUZ-GE15NA MUY-GE15NA
(PSIG)(PSIG)
68 707580859095100
105
(°F)
120
140
160
180
200
687075808590
95
100 105(°F)
280
320
360
400
440
Condensing pressure
86
80
75
70
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
Outdoor ambient temperature
Indoor DB temperature (°F)
86
80
75
70
(PSIG)
687075808590
95
100
105
(°F)
270
310
350
390
430
(PSIG)
687075808590
95
100
105
(°F)
100
115
130
145
160
Condensing pressure
86
80
75
70
Suction pressure
Indoor DB temperature (°F)
Outdoor ambient temperature
86
80
75
70
Indoor DB temperature (°F)
Outdoor ambient temperature
MUZ-GE18NA MUY-GE18NA
MUZ-GE24NA MUY-GE24NA
(PSIG)
480
450
420
390
360
330
Condensing pressure
300
270
687075808590
Indoor DB temperature (°F)
Outdoor ambient temperature
95
100 105
86
80
75
(°F)
(PSIG)
180
70
170
160
150
140
Suction pressure
130
120
110
687075808590
Outdoor ambient temperature
Indoor DB temperature (°F)
22
95
100 105
86
80
75
70
(°F)
Page 23
23
Heating (MUZ)
5 15253545556575(°F)5 15253545556575(°F)
60
85
110
135
160
185
210
260
300
340
380
420
460
Indoor DB temperature (°F)
Condensing pressure
Outdoor ambient temperature
(PSIG)(PSIG)
75
70
65
58Hz
Indoor DB temperature (°F)
Suction pressure
Outdoor ambient temperature
75
70
65
58Hz
Data is based on the condition of outdoor humidity 75%.
Air flow should be set to High speed.
Data is for heating operation without any frost.
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
5 seconds15 seconds
ON
Compressor
OFF
ON
Outdoor fan
motor
OFF
8-2. R.V. COIL CONTROL (MUZ)
Heating
Cooling
Dry
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 68°F (20
°C) or below. When pre-heat control is turned ON, compressor is energized. (About 50 W)
<JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 10-6.1.)
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
<Incorrect>
Lead wiring
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality. To make sure, check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting
service work.
2) Before servicing, check that the connector and terminal are connected properly.
3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) Refer to 10-2. and 10-3.
<Correct>
Housing point
Page 32
10-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details
can be recalled.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
MSZ-GE06/09/12/15/18NA
MSY-GE09/12/15/18NA
Operational procedure
The cause of abnormality cannot be found because the abnormality does not recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
MSZ-GE24NA
MSY-GE24NA
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature
is displayed) with the remote controller headed towards the indoor unit.
Does the upper lamp of OPERATION INDICATOR lamp on the
indoor unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal. Beep is
emitted at the same timing as the blinking of the upper
lamp of OPERATION INDICATOR lamp. 2
Yes
Judgment of indoor/outdoor abnormality
Releasing the failure mode recall function
Deleting the memorized abnormal condition
NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
Before blinking, does the upper lamp of OPERATION INDICATOR lamp stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
The indoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the indoor unit
failure mode table. (Refer to indoor unit service manual.)
Make sure to check at least two consecutive blinking cycles. 2
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the defective parts.
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
(Blinks)
No
1
No
(OFF)
Yes
1. Regardless of normal or abnormal condition, a short
beep is emitted once the signal is received.
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that can not be recalled with this way.
Confi rm if outdoor unit is abnormal according to the detailed outdoor
unit failure mode recall function. (Refer to 10-2.2)
The outdoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the
outdoor unit failure mode table. (Refer to 10-2.3)
Make sure to check at least two consecutive blinking cycles. 3
2. Blinking pattern when the indoor unit is abnormal:
2.5-second OFF
Blinking at 0.5second interval
2.5-second OFF
Blinking at 0.5second interval
ON
OFF
Repeated cycleRepeated cycle
Beeps
3.Blinking pattern when the outdoor unit is abnormal:
2.5-second OFF3-second ON
Blinking at 0.5second interval
Beeps
2.5-second OFF
Repeated cycle
3-second ON
ON
OFF
No beepBeeps
Repeated cycle
No beepBeeps
Repeated cycle
Beeps
Blinking at 0.5second interval
Repeated cycle
32
Page 33
33
2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
The outdoor unit might be abnormal.
Confi rm if outdoor unit is abnormal according to the following procedures.
Confi rm that the remote controller is in the failure mode recall function.
With the remote controller headed towards the indoor unit, press TOO
COOL or TOO WARM button to adjust the set temperature to 77°F (25°C).
1
Does the upper lamp of OPERATION INDICATOR
lamp on the indoor unit blink at the interval of 0.5
seconds?
Blinks: The outdoor unit is abnormal. Beep is emitted
at the same timing as the blinking of the upper
lamp of OPERATION INDICATOR lamp. 2
Yes
(Blinks
)
No
(OFF)
1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
The outdoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the out-
door unit failure mode table (10-2.3.).
Make sure to check at least two consecutive blinking cycles.
2
The outdoor unit is normal.
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Release the failure mode recall function according to the left mentioned procedure.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" (10-2.1.).
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with
the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function" men-
tioned above.
NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
Overcurrent protection stop is
continuously performed 3 times within
1 minute after the compressor gets
started.
Thermistor shorts or opens during
compressor running.
Large current fl ows into intelligent
power module.
Waveform of compressor current is
distorted.
Temperature of discharge temperature
thermistor exceeds 241°F (116°C),
compressor stops.
Compressor can restart if discharge
temperature thermistor reads 212°F
(100°C) or less 3 minutes later.
Temperature of indoor coil thermistor
exceeds 158°F (70°C) in HEAT mode
(MUZ only). Temperature of outdoor
heat exchanger temperature thermistor
exceeds 158°F (70°C) in COOL mode.
Temperature of fi n temperature
thermistor on the inverter P.C. board
exceeds 167 ~ 176°F (75 ~ 80°C), or
temperature of P.C. board temperature
thermistor on the inverter P.C. board
exceeds 158 ~ 167°F (70 ~ 75°C).
Outdoor fan has stopped 3 times in a
row within 30 seconds after outdoor fan
start-up.
Nonvolatile memory data cannot be
read properly.
The interphase short circuit occurs
in the output of the intelligent power
module (IPM). The compressor winding
shorts circuit.
Temperature of discharge temperature
thermistor has been 122°F (50°C) or
less for 20 minutes.
DC voltage of inverter cannot be
detected normally.
Each phase current of compressor
cannot be detected normally.
Large current fl ows into intelligent
power module (IPM).
The open-phase operation of
compressor is detected.
The interphase short circuit occurs
in the output of the intelligent power
module (IPM).
The compressor winding shorts circuit.
Closed valve is detected by compressor
current.
Reconnect connectors.
•
Refer to 10-5. "How
•
to check inverter/
compressor".
Check stop valve.
•
Refer to 10-5. "Check
•
of outdoor thermistors".
Defective outdoor
thermistors can be
identifi ed by checking
the blinking pattern of
LED.
Reconnect compressor
•
connector.
Refer to 10-5. "How
•
to check inverter/
compressor".
Check stop valve.
•
Reconnect compressor
•
connector.
Refer to 10-5. "How
•—
to check inverter/
compressor".
Check refrigerant circuit
•
and refrigerant amount.
Refer to 10-5. "Check
•
of LEV".
Check refrigerant circuit
•
and refrigerant amount.
Check stop valve.
•
Check around outdoor
•
unit.
Check outdoor unit air
•
passage.
Refer to 10-5.
•
of outdoor fan motor".
Refer to 10-5. "Check
•
of outdoor fan motor".
Refer to 10-5. "Check
of inverter P.C. board".
Replace the inverter
•
P.C. board.
Refer to 10-5. "How
•
to check inverter/
compressor".
Refer to 10-5. "Check
•
of LEV".
Check refrigerant circuit
•
and refrigerant amount.
Refer to 10-5. "How
•
to check inverter/
compressor".
Reconnect compressor
•
connector.
Refer to 10-5. "How
•
to check inverter/
compressor".
Check stop valve •
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
"Check
Indoor/
outdoor unit
failure mode
recall function
Outdoor unit
failure mode
recall function
○○
○○
—
○
○
—
—
—
—
○
○
○
○
○○
—
—
—
○
○
○
○○
34
Page 35
35
10-3. TROUBLESHOOTING CHECK TABLE
No. Symptom LED indication
Outdoor
unit does
1
not operate.
2
3
4
5
6
'Outdoor
unit stops
7
and restarts 3
minutes
later' is
8
repeated.
9
10
11
12
13
14
Outdoor
15
unit operates.
16
17
Outdoor
18
unit operates.
19
20
NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 10-6.1.
2. LED is lighted during normal operation.
The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing
(Example) When the fl ashing frequency is “2”.
1-time fl ash every
2.5 seconds
6-time fl ash
2.5 seconds OFF
11-time fl ash
2.5 seconds OFF
14-time fl ash
2.5 seconds OFF
2-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
5-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
10-time fl ash
2.5 seconds OFF
12-time fl ash
2.5 seconds OFF
13-time fl ash
2.5 seconds OFF
1-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
7-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
9-time fl ash
2.5 seconds OFF
Abnormal point/
Condition
Outdoor power system
Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, de-
Outdoor control system
Serial signal The communication fails between the indoor and outdoor unit for
Stop valve/
Closed valve
Outdoor unit
(Other abnormality)
Overcurrent protection
Discharge temperature overheat protection
Fin temperature /P.C.
board temperature
thermistor overheat
protection
High pressure protection
Compressor synchronous abnormality
Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after
Each phase current
of compressor
DC voltage DC voltage of inverter cannot be detected normally. Refer to 10-5. "How to check inverter/
Frequency drop by
current protection
Frequency drop by
high pressure protection
Frequency drop by
defrosting in COOL
mode
Frequency drop by
discharge temperature protection
Low discharge temperature protection
PAM protection PAM:
Pulse Amplitude
Modulation
Zero cross detecting
circuit
Inverter check mode The connector of compressor is disconnected, inverter check
Overcurrent protection stop is continuously performed 3 times
within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times.
frost thermistor, outdoor heat exchanger temperature thermistor,
P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.
Nonvolatile memory data cannot be read properly.
(The upper lamp of OPERATION INDICATOR of the indoor unit
lights up or fl ashes 7 times.)
3 minutes.
Closed valve is detected by compressor current. Check stop valve. •
Outdoor unit is defective.Refer to 10-2.2. "Flow chart of the de-
Large current fl ows into intelligent power module.
When overcurrent protection occurs within 10 seconds after
compressor starts, compressor restarts after 15 seconds (
GE09/12/15/18NA, MUY-GE09/12/15/18NA)
Temperature of discharge temperature thermistor exceeds 241°F
(116°C), compressor stops. Compressor can restart if discharge
temperature thermistor reads 212°F (100°C) or less 3 minutes
later.
Temperature of fi n temperature thermistor on the heat sink ex-
ceeds 167 ~ 176°F (75 ~ 80°C) or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167
°F (70 ~ 75°C).
Temperature of indoor coil thermistor exceeds 158°F (70°C) in
HEAT mode (MUZ only). Temperature of outdoor heat exchanger
temperature thermistor exceeds 158°F (70°C) in COOL mode.
The waveform of compressor current is distorted. Reconnect connector of compressor.
outdoor fan start-up.
Each phase current of compressor cannot be detected normally. Refer to 10-5.
Current from power outlet is nearing Max. fuse size.The unit is normal, but check the follow-
Temperature of indoor coil thermistor exceeds 131°F (55°C) in
HEAT mode, compressor frequency lowers.
Indoor coil thermistor reads 46°F (8°C) or less in COOL mode,
compressor frequency lowers.
Temperature of discharge temperature thermistor exceeds 232°F
(111°C), compressor frequency lowers.
Temperature of discharge temperature thermistor has been 122°F
(50°C) or less for 20 minutes.
The overcurrent fl ows into IGBT (Insulated Gate Bipolar transis-
tor: TR821) or the bus-bar voltage reaches 320 V or more, PAM
stops and restarts.
Zero cross signal for PAM control cannot be detected.
mode starts.
0.5-second ON
Condition Remedy
.
0.5-second ON
Reconnect connector of compressor.
•
Refer to 10-5. "How to check inverter/
•
compressor".
Check stop valve.
•
Refer to 10-5. "Check of outdoor
•
thermistors".
Replace inverter P.C. board. •
Refer to 10-5. "How to check miswir-
•
ing and serial signal error.
•
tailed outdoor unit failure mode recall
function".
Reconnect connector of compressor.
•
Refer to 10-5. "How to check inverter/
•
MUZ-
compressor".
Check stop valve.
•
Check refrigerant circuit and refrigerant
•
amount.
Refer to 10-5. "Check of LEV".
•
Check around outdoor unit.
•
Check outdoor unit air passage.
•
Refer to 10-5. "Check of outdoor fan
•
motor".
Check refrigerant circuit and refrigerant
•
amount.
Check stop valve.
•
•
Refer to 10-5. "How to check inverter/
•
compressor".
Refer to 10-5. "Check of outdoor fan
•
motor.
Refer to 10-5. "Check of inverter P.C.
•
board.
•
compressor".
•
compressor".
ing.
Check if indoor fi lters are clogged.
•
Check if refrigerant is short.
•
Check if indoor/outdoor unit air circula-
•
tion is short cycled.
Check refrigerant circuit and refrigerant
•
amount.
Refer to 10-5.
•
Refer to 10-5. "Check of outdoor
•
thermistors".
Refer to 10-5. "Check of LEV".
•
Check refrigerant circuit and refrigerant
•
amount.
This is not malfunction. PAM protection
will be activated in the following cases:
1 Instantaneous power voltage drop
(Short time power failure)
2 When the power supply voltage is high.
•
Check if the connector of the compressor is correctly connected. Refer to
10-5.
sor".
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Compressor
Measure the resistance with a tester.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Measure the resistance between terminals using a tester.
(Temperature: -4 ~ 104°F (-20 ~ 40°C))
Normal (Ω)
GE09GE12GE15/18GE24
U-V
U-W
1.36 ~ 1.931.52 ~ 2.170.78 ~ 1.110.83 ~ 1.18
V-W
WHT
V
RED BLK
W
U
Outdoor fan motor
R. V. coil (21S4)
(MUZ)
Expansion valve coil
(LEV)
Measure the resistance between lead wires using a tester.
(Temperature: -4 ~ 104°F (-20 ~ 40°C))
Color of lead wire
GE09/12GE15GE18/24
Normal (Ω)
RED – BLK
BLK – WHT
28 ~ 4011 ~ 16
WHT – RED
Measure the resistance using a tester.
(Temperature: 14 ~ 104°F (-10 ~ 40°C))
Normal (kΩ)
0.97 ~ 1.38
Measure the resistance using a tester.
(Temperature: 14 ~ 104°F (-10 ~ 40°C))
Color of lead wire Normal (Ω)
WHT – RED
RED – ORN
YLW – BRN
37 ~ 54
BRN – BLU
WHT
V
RED BLK
W
U
36
Page 37
37
10-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector between compressor
and the intelligent power module (IPM).
Check the voltage between terminals.
Are the voltages balanced?
Yes
Check the compressor.
No
See 10-5. “Check of open phase”.
Replace the inverter P.C. board.
See 10-5.
“Check of compressor”.
B Check of open phase
● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if
the inverter is normal by measuring the voltage balance between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<< Operation method>>
Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA-
TION: Refer to 7-6.)
<<Measurement point>>
at 3 points
BLK (U) - WHT (V)
BLK (U) - RED (W)
WHT(V) - RED (W)
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board fl ashes 9 times. (Refer to 10-6.1.)
Measure AC voltage between the lead wires at 3 points.
C Check of compressor
Refer to 10-5. “Check of compressor
winding”.
Is the compressor normal?
Yes
Refer to 10-5. “Check of compressor
operation time”.
Does the compressor operate continuously?
Yes
OK.
No
No
Replace the compressor.
Refer to 10-5. “Check of compressor start failure”.
Page 38
D Check of compressor winding
● Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the
compressor terminals.
<<Measurement point>>
at 3 points
BLK - WHT
BLK - RED
Measure the resistance between the lead wires at 3 points.
WHT - RED
<<Judgement>>
Refer to 10-4.
0[Ω] ················· Abnormal [short]
Infinite [Ω] ········ Abnormal [open]
NOTE: Be sure to zero the ohmmeter before measurement.
E Check of compressor operation time
<<Judgement>>
● Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to over current.
<<Operation method>>
Start heating or cooling operation by pressing EMERGENCY
OPERATION switch on the indoor unit.
(TEST RUN OPERATION: Refer to 7-6.)
<<Measurement>>
Measure the time from the start of compressor to the stop of
1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
38
Heating part
Page 39
39
G Check of outdoor thermistors
Disconnect the connector of thermistor in the outdoor P.C. board (see
below table), and measure the resistance of thermistor.
Is the resistance of thermistor normal? (Refer to 10-6.1.)
Yes
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
Yes
OK. (Cause is poor contact.)
No
Replace the thermistor except RT64. When RT64 is
No
abnormal, replace the inverter P.C. board.
Replace the inverter P.C. board.
MUZ/MUY-GE09/12/15/18NA
Thermistor Symbol Connector, Pin No. Board
Defrost (MUZ)RT61 Between CN641 pin1 and pin2
Discharge temperature RT62 Between CN641 pin3 and pin4
Fin temperature RT64 Between CN642 pin1 and pin2
Ambient temperature RT65Between CN643 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3
MUZ/MUY-GE24NA
Thermistor Symbol Connector, Pin No. Board
Defrost (MUZ)RT61 Between CN671 pin1 and pin2
Discharge temperature RT62 Between CN671 pin3 and pin4
Fin temperature RT64 Between CN673 pin1 and pin2
Ambient temperature RT65Between CN672 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6
Inverter P.C. board
Inverter P.C. board
H Check of R.V. coil
MUZ-GE09/12/15/18/24NA
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.
In case CN721 (MUZ-GE09/12/15/18NA)/CN602 (MUZ-GE24NA) is disconnected or R.V. coil is open, voltage is
generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil.
Check if CN721 (MUZ-GE09/12/15/18NA)/CN602 (MUZ-GE24NA) is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector between
the compressor and the intelligent
power module.
Turn ON the power supply and
press EMERGENCY OPERATION
switch twice (HEAT mode).
Is there 208/230 VAC between CN721 (MUZ-GE09/12/15/18NA)/CN602 (MUZ-GE24NA)
and on the inverter P.C. board 3 minutes
after the power supply is turned ON?
Yes
Replace the 4-way valve.
Replace the inverter
No
P.C. board.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector between
the compressor and the intelligent
power module.
Turn ON the power supply and
press EMERGENCY OPERATION
switch once (COOL mode).
Is there 230 VAC between CN721 (MUZ-GE09/12/15/18NA)/CN602 (MUZ-GE24NA)
and on the inverter P.C. board 3 minutes
after the power supply is turned ON?
No
Replace the 4-way valve.
Replace the inverter
Yes
P.C. board.
Page 40
I Check of outdoor fan motor
Disconnect the connectors CN931 and CN932
from the inverter P.C. board.Check the connection between the connector CN931 and CN932.
Is the resistance between each terminal of outdoor fan motor normal?
(Refer to 10-4.)
No
Yes
Disconnect CN932 from the inverter P.C. board, and turn on the
power supply.
Rotate the outdoor fan motor manually and measure the voltage
of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
(Fixed to either 5 or 0 VDC)
Replace the outdoor fan motor.
Does the voltage between each terminal become 5 and 0
No
VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
No
Replace the inverter P.C. board.
Yes
40
Page 41
41
J Check of power supply
MUZ-GE09/12/15/18NA MUY-GE09/12/15/18NA
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does The upper lamp of
OPERATION INDICATOR lamp on
the indoor unit light up?
Yes
No
Rectify indoor/outdoor
connecting wire.
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
Yes
Replace the indoor
electronic control P.C.
No
board.
Is there bus-bar voltage 260-325
VDC between DB61 (+) and DB61
(–) on the inverter P.C. board?
(Refer to 10-6.1.)
No
Check the electric parts in main circuit.
MUZ-GE24NA MUY-GE24NA
Disconnect the connector between
compressor and intelligent power
module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does the upper lamp of
OPERATION INDICATOR on the
indoor unit light up?
Yes
Yes
No
Does LED on the inverter P.C.
board light up or fl ash? (Refer
to 10-6.1.)
Yes
If LED lights up, it is OK.
If LED fl ashes, refer to 10-3.
Rectify indoor/outdoor
connecting wire.
Yes
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
Replace the inverter
No
P.C. board.
DB61
Inverter P.C. board
(Solder side)
Replace the indoor
electronic control P.C.
No
board.
260-325 VDC
Is there bus-bar voltage 294 - 370
VDC between JP715 (+) and JP30
(–) on the inverter P.C. board?
(Refer to 10-6.1.)
No
Check the electric parts in main circuit.
Yes
Does LED on the inverter P.C.
board light up or fl ash? (Refer
to 10-6.1.)
Yes
If LED lights up, it is OK.
If LED fl ashes, refer to 10-3.
325 -370 VDC
Replace the inverter
No
P.C. board.
JP715
JP30
Page 42
K Check of LEV (Expansion valve)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD except
the set temperature in operation display section of the
remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote
controller (the set temperature is displayed) with the
remote controller headed towards the indoor unit.
1
MSZ-GE06/09/12/15/18NA
MSY-GE09/12/15/18NA
MSZ-GE24NA
MSY-GE24NA
Expansion valve operates in full-opening direction.
Do you hear the expansion valve "click,
click·······"?
Do you feel the expansion valve vibrate
on touching it ?
No
Is LEV coil properly fi xed to
the expansion valve?
Yes
Does the resistance of LEV
coil have the characteristics?
(Refer to 10-4.)
No
Replace the LEV coil.
NOTE: After check of LEV, do the undermentioned operations.
1. Turn OFF the power supply and turn ON it again.
2. Press RESET button on the remote controller.
No
Yes
Properly fi x the LEV coil to the expansion valve.
Measure each voltage between connector
pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
4. Pin (-) — Pin (+)
Is there about 3 ~ 5 VAC between each?
NOTE: Measure the voltage by an analog
OK.
Yes
tester.
Replace the expansion valve.
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
Replace the inverter P.C.
No
board.
Yes
42
Page 43
43
L Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to 10-5. .)
Is the fuse (F901) blown on the inverter P.C. board?
No
Check the connection of the connectors
(CN931 , CN932) of the outdoor fan motor.
If the connection is poor, make it correct.
Only for MUZ/MUY-GE24NA
Operate the outdoor unit by starting
EMERGENCY OPERATION.
Check the LED indication on the inverter P.C. board.
Does the LED fl ash 10 times?
Yes
(10-time fl ash)
Replace the inverter P.C. board.
Yes
No
Check the remedy following LED
indication.
(Refer to 10-3.)
Page 44
M How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Press EMERGENCY OPERATION switch once.
Does the OPERATION INDICATOR lamp light
up? <Confi rmation of the power to the indoor
unit>
Is serial signal error indicated 6 minutes later?
Turn OFF the power supply.
Check once more if the indoor/outdoor
B
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
Turn ON the power supply.
Is the bus-bar voltage of the inverter P.C. board normal? (Refer to "TEST POINT DIAGRAM AND
VOLTAGE" in this manual.)
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Yes
Yes
Yes
Yes
A
Yes
Yes
No
No
No
1. Miswiring may damage indoor electronic control P.C.
3. Be sure to check this within 3 minutes after turning ON.
No
(Lighted
or not
lighted)
Check the power supply.
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connecting wire?
board during the operation.
Be sure to confi rm the wiring is correct before the opera-
tion starts.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board or the outdoor electronic control P.C.
board is normal, LED blinks 6 times after 3 minutes.
Replace the inverter P.C. board . 2
No
No
2. Be careful of the residual voltage of smoothing
capacitor.
Check the wiring.
Correct them.
Yes
Check of power supply.
(Refer to 10-5. .)
No
A
Turn OFF inverter-controlled lighting
•
equipment.
Turn OFF the power supply and then
•
turn ON again.
Press EMERGENCY OPERATION
•
switch.
Reinstall
•
either the unit
or the light
away from
No
•
each other.
Attach a fi lter
on remote
control receiving section
of the indoor
unit.
Is serial signal
error indicated 6
minutes later?
Yes
B
Replace the indoor electronic control P.C. board.
44
Page 45
45
N Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Yes
Is the distance between the antennas
and the indoor unit within 9.91 ft., or is
the distance between the antennas and
the outdoor unit within 9.91 ft.?
No
Is the distance between the TV sets or
radios and the indoor unit within 3.28
ft., or is the distance between the TV
sets or radios and the outdoor unit
within 9.91 ft.?
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
No
No
Yes
Yes
Yes
Yes
Ground the unit.
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Replace or repair the antenna.
Replace or repair the coaxial cable.
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength
or the installation condition (combination of specifi c conditions such as antennas or wiring).
Check the followings before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifi er such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller
for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
Page 46
-414325068 86 104
0
10
20
30
40
50
60
70
80
90
100
Temperature(°F)
Defrost thermistor(RT61) (MUZ)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
Jumper wire for
changing defrost
setting (JS)(MUZ)
Jumper wire
for pre-heat
control setting
(JK)
Page 47
47
-414325068 86 104
0
10
20
30
40
50
60
70
80
90
100
Temperature(°F)
Defrost thermistor(RT61) (MUZ)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
Temperature(°F)
Discharge temperature thermistor(RT62)
32 50 68 86 104 122 140 158 176 194 212 230 248
0
100
200
300
400
500
600
700
32 50 68 86 104 122 140 158 176
0
20
40
60
80
100
120
140
160
180
200
Temperature(°F)
Fin temperature thermistor(RT64)
Resistance(kΩ)
Resistance(kΩ)
Resistance(kΩ)
MUZ-GE18NA MUY-GE18NA
Back side of unit
208/230 VAC
Fuse (F901)
T3.15AL250V
Output to
drive
compressor
(LDU,
LDV,
LDW)
Bus-bar voltage
DB61
260-325 VDC
(-)
(+)
Smoothing
capacitor
(C63)
Smoothing
capacitor
(C62)
Fuse (F801)
T3.15AL250V
Smoothing
capacitor
(C61)
Fuse (F701)
T3.15AL250V
R.V.coil
(CN721)
208/230
VAC
(MUZ)
208/230
VAC
Front side of unit
Fin temperature
thermistor /RT64
(CN642)
Outdoor heat exchanger
temperature thermistor
/RT68(CN644)
Defrost thermistor
(CN643)
/RT61(CN641)(MUZ)
Discharge temperature
thermistor /RT62
Ambient temperature
thermistor /RT65
Signal of outdoor fan
(CN641)
Output to drive outdoor
fan motor (CN932)
motor (CN931)
LEV connector (CN724)
LED
Jumper wire for changing
defrost setting (JS)(MUZ)
Jumper wire for pre-heat
control setting (JK)
Page 48
-414325068 86 104
0
10
20
30
40
50
60
70
80
90
100
Temperature(°F)
Defrost thermistor(RT61) (MUZ)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
Temperature(°F)
Discharge temperature thermistor(RT62)
32 50 68 86 104 122 140 158 176 194 212 230 248
0
100
200
300
400
500
600
700
32 50 68 86 104 122 140 158 176
0
20
40
60
80
100
120
140
160
180
200
Temperature(°F)
Fin temperature thermistor(RT64)
Resistance(kΩ)
Resistance(kΩ)
Resistance(kΩ)
MUZ-GE24NA
MUY-GE24NA
Fuse (F62)
T2.0AL250V
Fuse (F601)
T3.15AL250V (MUZ)
R.V. coil (CN602)
208/230 VAC (MUZ)
Jumper wire for
changing defrost
setting (JS) (MUZ)
Jumper wire for
pre-heat control
setting (JK)
Signal of outdoor fan motor
(CN931)
LED
Output to
drive outdoor
fan motor
(CN932)
Fuse (F901)
T3.15AL250V
Fuse (F880)
T3.15AL250V
Defrost thermistor
/RT61 (CN671) (MUZ)
Discharge temperature
thermistor/RT62
(CN671)
Outdoor heat exchanger
temperature thermistor
/RT68 (CN671)
Ambient temperature
thermistor/RT65
(CN672)
Fin temperature
thermistor/RT64
(CN673)
LEV connector (CN724)
48
JP715 (+)
Bus-bar voltage
325 - 370 VDC
JP30 (-)
Page 49
11
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types (refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
Sleeve
Slide the sleeve.
Pull the terminal while
Locking lever
pushing the locking
lever.
(2) The terminal with this connector has the
locking mechanism.
(1) Remove the screw fixing the service panel.
(2) Pull down the service panel and remove it.
(3) Remove the screws fixing the conduit cover.
(4) Remove the conduit cover.
(5) Disconnect the power supply wire and indoor/outdoor
connecting wire.
(6) Remove the screws fixing the top panel.
(7) Remove the top panel.
(8) Remove the screws fixing the cabinet.
(9) Remove the cabinet.
(10)
Remove the screws fixing the back panel.
(11)
Remove the back panel.
Photo 1
Screws of the top panel
Hold the sleeve, and
pull out the terminal
slowly.
Connector
NOTE: Turn OFF power supply before disassembly.
Screws of the top panel
Back
panel
Screw
of the
back
panel
Photo 2
Screws of
the cabinet
Screw of the
cabinet
Screws of
the terminal block
support and the
back panel
Screw of the
service panel
Direction to
remove
Hooks
Screws of the cabinet
Photo 3
Conduit cover
49
Service
panel
Screw of the
conduit cover
Conduit plate
Page 50
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following
ture thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the heat sink support and the
separator.
(5) Remove the fixing screws of the terminal block support and
the back panel.
(6) Remove the inverter assembly.
(7) Remove the screw of the ground wire and screw of the ter-
minal block support.
(8) Remove the heat sink support from the P.C. board support.
(9) Remove the screw of the inverter P.C. board and remove
the inverter P.C. board from the P.C. board support.
Photo 4
Screws of the heat sink
support and the separator
Photo 5 (Inverter assembly)
Heat sinkInverter P.C. board
Hook of the
P.C. board
support
P.C. board
support
Screws of the
terminal block
support and the
back panel
Screw of the
terminal block
support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil.
(MUZ)
Heat sink support
Hook of the P.C.
board support
Photo 6
Discharge temperature thermistor
Terminal
block support
Screw of the
ground wire
Screw of the P.C.
board fixture
R.V. coil (MUZ)
50
Page 51
51
OPERATING PROCEDURE
PHOTOS
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following
ture thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its hold-
er. (Photo 6)
(4) Pull out the defrost thermistor from its holder.
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder.
(6) Pull out the ambient temperature thermistor from its holder.
5. Removing outdoor fan motor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931, CN932 (Fan motor)
(3) Remove the propeller nut.
(4) Remove the propeller.
(5) Remove the screws fixing the fan motor.
(6) Remove the fan motor.
Photo 7
Photo 8
Outdoor heat
exchanger temperature thermistor
Defrost thermistor
(MUZ)
Screws of the outdoor fan motor
6. Removing the compressor and 4-way valve
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Remove the inverter assembly. (Refer to 2.)
(3) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure
gauge shows 0 PSIG.
(4) Detach the brazed part of the suction and the discharge
pipes connected with compressor.
(5) Remove the nuts of compressor legs.
(6) Remove the compressor.
(7) Detach the brazed part of the pipes connected with 4-way
valve.
Propeller
Photo 9
Propeller nut
Brazed parts of 4-way valve
Page 52
11-2. MUZ-GE18NA MUY-GE18NA
NOTE: Turn OFF power supply before disassembly.
OPERATING PROCEDURE
1. Removing the cabinet
(1) Remove the screws of the service panel.
(2) Remove the screws of the top panel.
(3) Remove the screw of the valve cover.
(4) Remove the service panel.
(5) Remove the top panel.
(6) Remove the valve cover.
(7) Disconnect the power supply and indoor/outdoor connect-
ing wire.
(8) Remove the screws of the cabinet.
(9) Remove the cabinet.
(10)
Remove the screws of the back panel.
(11)
Remove the back panel.
Photo 1
Screw of the top panel
Screws
of the
back
panel
Photo 2
Screws of the top panel
PHOTOS
Screws of the cabinet
Screws
of the
cabinet
52
Screws
of the
cabinet
Screw
of the
service
panel
Screw
of the
valve
cover
Screws of
the back
panel
Page 53
53
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following con-
nectors:
<Inverter P.C. board>
CN721 (R.V.coil) (MUZ)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor (MUZ) and discharge temperature
thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the heat sink support and the sep-
arator.
(5) Remove the fixing screws of the terminal block support and
the back panel.
(6) Remove the inverter assembly.
(7) Remove the screw of the ground wire and screw of the termi-
nal block support.
(8) Remove the heat sink support from the P.C. board support.
(9) Remove the screw of the inverter P.C. board and remove the
inverter P.C. board from the P.C. board support.
Photo 3
Screw of the heat sink
support and the separator
Photo 4 (Inverter assembly)
Heat sink
Hook of the P.C.
board support
Inverter P.C. board
P.C. board
support
Screws of
the terminal
block support
and the back
panel
Screws of
the reactor
Screw of the
terminal block
support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil) (MUZ)
(3) Remove the R.V. coil.
Heat sink support
Hook of the P.C.
board support
Photo5
Screw of the
ground wire
Screw of the P.C.
board fixture
R.V. coil (MUZ)
Brazed parts of 4-way valve
Terminal block
support
Page 54
OPERATING PROCEDUREPHOTOS
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN641 (Defrost thermistor (MUZ) and discharge tempera-
ture thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its hold-
er. (Photo 8)
(4) Pull out the defrost thermistor from its holder.
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder.
(6) Pull out the ambient temperature thermistor from its holder.
5. Removing outdoor fan motor
(1)
Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
(3) Remove the propeller.
(4) Remove the screws fixing the fan motor.
(5) Remove the fan motor.
Photo 6
Photo 7
Screws of
the outdoor
fan motor
Outdoor heat
exchanger temperature thermistor
Ambient tem-
perature
thermistor
Defrost thermistor
(MUZ)
6. Removing the compressor and 4-way valve
(1)
Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge
shows 0 PSIG.
(5) Detach the brazed part of the suction and the discharge
pipes connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the brazed parts of 4-way valve and pipes. (Photo 5)
54
Photo 8
Brazed part of the
discharge pipe
Discharge temperature
thermistor
Brazed part of the
suction pipe
Page 55
55
11-3. MUZ-GE24NA MUY-GE24NA
OPERATING PROCEDUREPHOTOS
NOTE: Turn OFF power supply before disassembly.
1. Removing the cabinet
(1) Remove the screws of the service panel.
(2) Remove the screws of the top panel.
(3) Remove the screw of the valve cover.
(4) Remove the service panel.
(5) Remove the screws fixing the conduit cover.
(6) Remove the conduit cover.
(7) Remove the top panel.
(8) Remove the valve cover.
(9) Disconnect the power supply and indoor/outdoor con-
necting wire.
(
10
) Remove the screws of the cabinet.
(11) Remove the cabinet.
(12)
Remove the screws of the back panel.
(13)
Remove the back panel.
Photo 2
Screws of the
Screws of the
top panel
Screws of
the back
panel
back panel
Screws of the
back panel
Photo 1
Screws of the
cabinet
Photo 3
Screws of the top panel
Screws of the
cabinet
Screws
of the
cabinet
Screws of the
back panel
Screws of
the back
panel
Screws of the
conduit cover
Conduit plate
Screws of
the service
panel
Screw of
the valve
cover
Page 56
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following con-
and outdoor heat exchanger temperature thermistor)
CN672 (Ambient temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector.
(4) Remove the screws fixing the relay panel.
(5) Remove the relay panel.
(6) Remove the ground wires and the lead wires of the inverter
P.C. board.
(7) Remove the screw of the PB support.
(8) Remove the inverter P.C. board from the relay panel.
Photo 4
Inverter P.C
board
Screws
of the PB
support
Ground wires
Screws of the
relay panel
Screw of the
relay panel
Screws of the
PB support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connector:
<Inverter P.C. board>
CN602 (R.V. coil) (MUZ)
(3) Remove the R.V. coil.
Photo 5
Screw of the
R.V. coil (MUZ)
Brazed parts of
4-way valve
56
Page 57
57
OPERATING PROCEDUREPHOTOS
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following
connectors:
<Inverter P.C. board>
CN671 (Defrost thermistor (MUZ), discharge temperature
thermistor and outdoor heart exchanger temperature thermistor)
CN672 (Ambient temperature thermistor)
(3)
Pull out the discharge temperature thermistor from its holder.
(Photo 8)
(4) Pull out the defrost thermistor from its holder.
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder.
(6) Pull out the ambient temperature thermistor from its holder.
5. Removing outdoor fan motor
(1)
Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
(3) Remove the propeller.
(4) Remove the screws fixing the fan motor.
(5) Remove the fan motor.
Photo 6
Outdoor heat
exchanger temperature thermistor
Photo 7
Ambient temperature
thermistor
Defrost thermistor (MUZ)
6. Removing the compressor and 4-way valve
(1)
Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0 MPa).
(5) Detach the brazed part of the suction and the discharge
pipes connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8)
Detach the brazed parts of 4-way valve and pipes. (Photo 5)
Photo 8
Brazed part of the
discharge pipe
Screws of the
outdoor fan motor
Discharge temperature
thermistor
Brazed part of the suction pipe
Page 58
TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN