Service Functions - Mitsubishi Electric MXZ-2A30VA - E1 Service Manual

12

SERVICE FUNCTIONS

MXZ-2A30VA MXZ-2A40VA MXZ-2A52VA MXZ-3A54VA MXZ-4A71VA MXZ-4A80VA
MXZ-5A100VA
12-1. LOCKING THE OPERATION MODE OF THE 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.
12-2. 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 3rd Dip Switch 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.
12-3. PRE-HEAT CONTROL <MXZ-2A, MXZ-3A54VA-
MXZ-4A80VA-
E2
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-4A80VA-
Set the 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to
deactivate pre-heat control function (MXZ-3A54VA-
Cut the JK wire of the inverter P.C. board to deactivate pre-heat control
function (MXZ-2A).
SW2
ON
1 2 3 4 5 6
MXZ-4A80VA-
E2
MXZ-5A100VA
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
, MXZ-5A100VA>
SW1
ON
1 2 3 4
, ,
MXZ-3A54VA-
E4 E5 E6 , E7
, ,
MXZ-4A71VA-
E4 E5 E6 , E7
MXZ-2A30/2A40/2A52
COOL/DRY
SW1
SW1
ON
ON
MXZ-2A30/2A40/2A52/3A54/4A71VA
MXZ-4A80VA-
E1
COOL/DRY
SW1
SW1
ON
ON
MXZ-4A80VA-
E2
MXZ-5A100VA
, , , , MXZ-4A71VA-
E4 E5 E6 E7
, MXZ-5A100VA).
E2
, , , , MXZ-4A71VA-
E4 E5 E6 E7
JK
MXZ-2A
116
ON
ON
MXZ-3A54/4A71VA
HEAT
MXZ-4A80VA-
HEAT
SW2
SW1
SW871
MXZ-4A80VA-
MXZ-5A100VA
SW1
ON
, , ,
E4 E5 E6 E7
, , ).
E4 E5 , E6 E7
SW2
ON
1 2 3 4 5 6
SW2
SW1
SW871
MXZ-4A80VA-
MXZ-5A100VA
E1
E2
,
E2