Mitsubishi Electric MXZ-2D33VA Service Manual page 91

10-5. 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 to generate heat at the winding.
The compressor uses about 50 W when pre-heat control is turned ON. Pre-heat control is OFF(MXZ-2D33VA/2D40VA/
2D42VA/2D53VA/2D53VAH) / ON (MXZ-3D54VA/3D54VA2/3D68VA/4D72VA/4D83VA/5D102VA) at the default setting.
[How to activate pre-heat control]
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Set the "4" of SW2 as shown figure below to ON to activate pre-heat control function.
(3) Turn ON the breaker.
MXZ-2D33VA/2D40VA/2D42VA/2D53VA/2D53VAH
SW2 on the outdoor display P.C. board
MXZ-3D54VA/3D54VA2/3D68VA/4D72VA
MXZ-4D83VA/5D102VA
SW2 on the outdoor control P.C. board
SW2
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
10-6. CHANGING THE AMPERE LIMIT
With this function, you can change the current that flows in the outdoor unit.
NOTE: Use this function only when the amount of current exceeds the allowed value.
[How to change the ampere limit]
(1) Turn OFF the breaker and make sure that the LED goes off.
(2) Set SW2 as shown in the table below.
(3) Turn ON the breaker.
MXZ-4D83VA/5D102VA
SW2 on the outdoor control P.C. board
SW2
OBH626F
MXZ-4D83VA/5D102VA
10.5 A
15.5 A
Default setting
Full
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