Service manual

9. AUTO RESTART FANCTION (Optional)
How to restart units after power failure by Auto Restart.
Model ONNErnOR NO. MrnOD
1
1, MS-09DW- rn 1 CNl25 1
Short the connector 5 - 7 on the electronic control P.C. board for connector
position, refer to page 38.
Operation
When power is restored the unit
will operate in the emergency-test run mode. Even if the unit is turned off at the thermostat,
it will come on after a power failure.
The heat or cool mode will
be determined by the position of the emergency-test run
selector switch. When a button on the remote contoller is pressed the unit will return to normal operation as the controller
has priority.
See page 27 for emergency-test run operation.
MSH-O9DW-
rn
MSH-12DN- [CTil
MSH-15DN- QJ
lO.COMPULSORY DEFROSTING MODE FOR SERVICE
Defrosting mode can be accomplished regardless of the defrost interval restriction by short-circuiting the connector
(CN606) on the outdoor P.
C. board which is located in outdoor unit.
This compulsory defrosting mode should
be started by the pulse based on the temperature sensed at the defrost thermistor
*
(RT~ 1 ) . Therefore,
as far as RT61 senses higher than 27'F, the compulsory defrosting mode connot
be achieved.
* RT61 is attached to the outdoor heat exchanger. See page 42 and 45 for the position of the connector CN606.
CN 105
CN 107
Short the connector 1
- 3 on the electronic control P.C. board.
For connector position, refer to page 40 for model MSH-O9DW-
rn or page 43 for
model MSH-12/15DN-
a.
Set the emergency run switch to "COOL" or "HEAT"