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10
SERVICE FUNCTIONS
MXZ-2B30VA MXZ-2B40VA MXZ-2B52VA MXZ-3B54VA MXZ-3B68VA MXZ-4B71VA
MXZ-4B80VA MXZ-5B100VA
10-1. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
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 display P.C. board or the outdoor
electronic control P.C. board as shown in the right figure.
Turn ON the power supply for the air conditioner.
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" of SW1 on the display P.C. board or the outdoor electronic
control P.C. board to ON to enable this function.
Turn ON the power supply for the air conditioner.
10-3. PRE-HEAT CONTROL
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 4th Dip Switch of SW2 on the outdoor electronic control P.C. board to ON
to deactivate pre-heat control function (MXZ-4B80VA, MXZ-5B100VA).
Set the 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to ON
to deactivate pre-heat control function (MXZ-3B54VA, MXZ-3B68VA, MXZ-4B71VA).
Cut the JK wire of the inverter P.C. board to deactivate pre-heat control
function (MXZ-2B30VA, MXZ-2B40VA, MXZ-2B52VA).
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
OBH554D
MXZ-2B30/2B40/2B52VA
COOL/DRY
SW1
ON
MXZ-2B30/2B40/2B52/
3B54/3B68/4B71VA
COOL/DRY
SW1
ON
MXZ-4B80/5B100VA
SW1
SW2
ON
ON
1 2 3 4
1 2 3 4 5 6
MXZ-3B54/3B68/4B71VA
MXZ-4B80/5B100VA
60
ON
ON
HEAT
MXZ-3B54/3B68/4B71VA
SW1
ON
HEAT
SW1
ON
SW1
ON
SW2
ON
1 2 3 4 5 6
MXZ-2B20/2B40/2B52VA
SW2
SW1
SW871
MXZ-4B80/5B100VA
SW2
SW1
SW871
MXZ-4B80/5B100VA
JK
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