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SERVICE FUNCTIONS
9
9-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JPG1 and R871 on the outdoor deicer P.C. board, defrosting mode can be accomplished
regardless of the defrost interval restriction.
Defrost thermistor RT61 must read below 27°F. (Refer to page 42.)
MSH24WN MUH24WN
MUH24WN
Model
Jumper wire
Change point
JRF
JRG
Defrost interval time changes from 40 minutes to 15minutes.
Defrost start temperature does not change (27˚F).
Defrost finish temperature changes from 56˚F to 59˚F.
9-2. CHANGE IN DEFROST SETTING
<JRF> When the JRF wire of the deicer P.C. board is cut, the defrost interval time is changed.
<JRG> When the JRG wire of the deicer P.C. board is cut, the defrost temperature is changed. (Refer to page 42.)
9-3. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows. (Refer to page 41.)
Set time : 1 minute
➔
1-second
Set time : 3 minute
➔
3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
9-4. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the indoor unit number.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
NOTE : For remodelling, take out the
batteries and press the
OPERATE/STOP(ON/OFF)button
twice or 3 times at first.
After finish remodelling, put back
the batteries then press the
RESET button.
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