Toshiba MXZ-2DM40VA Service Manual page 23

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-2DM40VA) / ON
(MXZ-3DM50VA) at the default setting.
MXZ-2DM40VA
[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.
SW2 on the outdoor display P.C. board
Switch
(Factory setting)
SW2
MXZ-3DM50VA
[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 OFF to activate pre-heat control function.
(3) Turn ON the breaker.
SW2 on the outdoor control P.C. board
Switch
(Factory setting)
SW2
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
OBH739A
Pre-heat control
Deactivated
Pre-heat control
Activated
Deactivated
Activated
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