Mitsubishi Electric MXZ-3C68VA Service Manual Page 51
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51
MXZ-4C80/5C100VA
MXZ-6C120VA
SW2
SW1
SW871
MXZ-3C54/3C68/4C71VA
Oudoor electronic
control P.C. board
Oudoor electronic
control P.C. board
Oudoor control P.C. board
MXZ-4C80/5C100/6C120VA
MXZ-3C54/3C68/4C71VA
Description of the function:
With this function, you can lock the operation mode of the
outdoor unit. Once the operation mode is locked to either
COOL/DRY mode or HEAT mode, the air conditioner
operates in that mode only.
Initial setting is required to activate this function. Please
explain about this function to your customers and ask
them whether they want to use it.
[How to lock the operation mode]
Turn OFF the power supply for the air conditioner
before making the setting.
Set SW1 on the outdoor P.C. board as shown
in the right figure.
Turn ON the power supply for the air conditioner.
ON
ON
COOL/DRY HEAT
SW1
SW1
ON
ON
COOL/DRY HEAT
SW1
SW1
ON
ON
SW2
123456
ON
SERVICE FUNCTIONS
10
10-1. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
10-2. LOWERING THE OPERATING NOISE OF THE OUTDOOR UNIT
Description of the function:
With this function, you can lower the operating noise of the
outdoor unit when the operation load is small,for example,
during nighttime in COOL mode. However, please note that the
cooling and heating capacity can also be lowered if this function is activated.
Initial setting is required to activate this function. Please explain about this
function to your customers and ask them whether they want to use it.
[How to lower the operating noise]
Turn OFF the power supply for the air conditioner before making the setting.
Set the “3” Switch of SW1 on the outdoor P.C. board to ON to enable this function.
Turn ON the power supply for the air conditioner.
ON
SW1
ON
SW2
12345
6
SW1
ON
1234
MXZ-3C54/3C68/4C71VA
MXZ-4C80/5C100/6C120VA
If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere
the start-up of the compressor.
To improve start-up condition, the compressor is energized even while it is not operating.
This is to generate heat at the winding.
The compressor uses about 50 W when pre-heat control is turned ON.
Pre-heat control is ON at initial setting.
[How to deactivate pre-heat control]
Turn OFF the power supply for the air conditioner before making the setting.
Set the “4” of SW2 on the outdoor P.C. board to ON
to deactivate pre-heat control function (MXZ-4C80VA, MXZ-5C100VA, MXZ-6C120VA).
Set the “4” of SW1 on the outdoor control P.C. board to ON
to deactivate pre-heat control function (MXZ-3C54VA, MXZ-3C68VA, MXZ-4C71VA).
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
10-3. PRE-HEAT CONTROL
MXZ-3C54VA MXZ-3C68VA MXZ-4C71VA MXZ-4C80VA MXZ-5C100VA MXZ-6C120VA
- OUTDOOR UNIT 1
- TECHNICAL CHANGES 2
- PART NAMES AND FUNCTIONS 3
- SPECIFICATION 4
- Compressor 5
- NOISE CRITERIA CURVES 10
- MICROPHONE 11
- OUTLINES AND DIMENSIONS 12
- MXZ-4C71VA 13
- MXZ-4C80VA 14
- MXZ-5C100VA 14
- Unit: mm 15
- WIRING DIAGRAM 16
- MXZ-3C68VA 17
- MXZ-6C120VA 21
- REFRIGERANT SYSTEM DIAGRAM 22
- MAX REFRIGERANT PIPING LENGTH 23
- ADDITIONAL REFRIGERANT CHARGE 23
- PERFORMANCE CURVES 27
- (MPa[Gauge]) 42
- ACTUATOR CONTROL 50
- SERVICE FUNCTIONS 51
- 10-4. AUTO LINE CORRECTING 52
- TROUBLESHOOTING 54
- MXZ-3C/4C/5C 55
- Lighting 60
- MXZ-3C54/3C68/4C71VA 60
- MXZ-4C80/5C100VA 60
- Check of power supply 64
- Turn ON the power supply 64
- (Parts side) 65
- LED indication 65
- Check of R.V. coil 66
- Check of LEV 67
- Check of outdoor fan motor 70
- Check of HPS 72
- The other cases 73
- Check of bus-bar voltage 73
- Defrost thermistor (RT61) 74
- Temperature (°C) 74
- Resistance (kΩ) 74
- 2. Outdoor control P.C. board 76
- 3. Noise filter P.C. board 77
- 4. Outdoor Power board 78
- DISASSEMBLY INSTRUCTIONS 80
- OPERATING PROCEDURE 81
- OPERATING PROCEDURE PHOTOS 82
- 12-3. MXZ-6C120VA 86
- Made in Japan 90
- MXZ-3C54VA COOLING 91
- MXZ-3C54VA HEATING 94
- MXZ-3C68VA COOLING 100
- MXZ-3C68VA HEATING 101
- MXZ-4C71VA COOLING 105
- MXZ-4C71VA HEATING 113
- MXZ-4C80VA COOLING 121
- MXZ-4C80VA HEATING 132
- MXZ-5C100VA COOLING 143
- MXZ-5C100VA HEATING 167
- MXZ-6C120VA COOLING 191
- MXZ-6C120VA HEATING 231
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