Service Functions; Noise - Mitsubishi Electric MXZ-2C30VA Service Manual

10

SERVICE FUNCTIONS

MXZ-2C30VA MXZ-2C40VA MXZ-2C52VA MXZ-3C54VA MXZ-3C68VA MXZ-4C71VA
MXZ-4C80VA MXZ-5C100VA MXZ-6C120VA
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
outdoor P.C. board as shown in the right figure.
Turn ON the power supply for the air conditioner.
COOL/DRY
SW1
ON
MXZ-2C30/2C40/2C52/
3C54/3C68/4C71VA
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 display P.C. board or the outdoor 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 "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).
Cut the JK wire of the inverter P.C. board to deactivate pre-heat control
function (MXZ-2C30VA, MXZ-2C40VA, MXZ-2C52VA).
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
HEAT COOL/DRY
SW1 SW1
ON
ON
MXZ-4C80/5C100/6C120VA
MXZ-2C30/2C40/2C52VA
Display P.C. board
HEAT
SW1
ON
66
MXZ-3C54/3C68/4C71VA
ON
ON
Oudoor electronic
control P.C. board
MXZ-4C80/5C100VA
SW2
ON
SW2
SW1
SW871
1 2 3 4 5 6
Oudoor electronic
control P.C. board
MXZ-6C120VA
Oudoor control P.C. board
SW1
ON
SW2
ON
1 2 3 4 5 6
MXZ-4C80/5C100/6C120VA
SW1
ON
1 2 3 4
MXZ-3C54/3C68/4C71VA
MXZ-2C20/2C40/2C52VA
JK