Timer Short Mode; P.c. Board Modification For Individual Operation - Mitsubishi Electric MSH09TW Service Manual

-
<MUH09TW , MUH12/15/17TN
U1
<JPC> When the JPC wire of the deicer P.C. board is soldered, the defrost interval time is changed.
<JPE> When the JPE wire of the deicer P.C. board is soldered, the defrost temperature is changed. (Refer to page 96.)
Model
MUH09TW - MUH12TN -
U1
MUH12TN - MUH15TN -
U1
MUH15TN -
U1
MUH17TN -
U1

11-3. 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 94 or 95.)
Set time : 1 minute
Set time : 3 minutes

11-4. 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 :
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.
-
, MUH12/15TN
U1
Jumper wire
U2
JPC
U2
JPE
1-second
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.)
-
>
U2
Change point
Defrost interval time changes from 15 minutes to 40 minutes.
Defrost start temperature changes from 32˚F to 27˚F.
Defrost finish temperature changes from 50˚F to 38˚F.
NOTE : For remodelling, take out the bat-
73
teries 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.