Mitsubishi Electric Mr. Slim MSH09NW, Service Manual

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10
MSH09NW, MSH12NN, MSH15NN, MSH17NN
3. AUTO RESTART FUNCTION
When the indoor unit is operated with the remote controller, the signals of the operation mode, the set temperature, and the
fan speed are sent from the indoor electronic control P.C.board and memorized in the auto restart assy.
When the main power is turned off and then turned on back again, the unit restarts automatically in the memorized set con-
ditions approximately after 3 seconds.
NOTE:
a) When the unit operation is stopped with the Emergency Operation Switch, the unit does not restart after the power is
restored, since the signal of “Operation Stop” is memorized in the auto restart assy.
b) Operation details may not be memorized in case the signal is transmitted by the remote controller to turn the main
power OFF within 10 seconds after the power ON. .
c) When the unit operation is stopped with the remote controller before power failure, the unit does not restart until the
OPERATE/STOP (ON/OFF) button on the remote controller is pressed.
4. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronics control P.C. board.
The time will be shortened as follows.
3-minute delay : 3-minute
➔
3-second.
AUTO START : 1 hour
➔
1-minutes
AUTO STOP : 1 hour
➔
1-minutes
Short the connector during the timer mode.
}
SERVICE FUNCTIONS
1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accomplished
regardless of the defrost interval restriction. See Page 53.
Defrost thermistor RT61 must read below 27°F
2. DEFROST TERMINATION CHANGE
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed.
<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed.
MSH09NW
MSH12NN
MSH15NN
MSH17NN
Model Junper wire Change point
JPC
JPE
Defrost interval time changes from 40 minutes to 15minutes.
Defrost start temperature changes from 27˚F to 32˚F.
Defrost finish temperature changes from 38˚F to 50˚F.
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