Service Functions - Mitsubishi Electric MSC-C07TV Service Manual

10

SERVICE FUNCTIONS

MU-C07TV -
MSC-C07TV -
E1
MU-C09TV -
MSC-C09TV -
E1
MU-C12TV -
MSC-C12TV -
E1
10-1. 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 accom-
plished regardless of the defrost interval restriction. (Refer to page 58.)
Defrost thermistor RT61 must read below -4.6°C(MUH-C07TV)/ -2.7°C(MUH-C09/C12TV).
10-2. CHANGE IN DEFROST SETTING
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (Refer to page 58.)
Model
MUH-C07TV -
E1
MUH-C09TV -
E1
MUH-C12TV -
E1
10-3. 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 57.)
Set time : 1 minute
Set time : 3 minute
shortened by short circuit of JPG and JPS.)
10-4. 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 number of the indoor unit.
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, push the RESET button.
MUH-C07TV -
E1
MUH-C09TV -
E1
MUH-C12TV -
E1
<
MUH-C07/C09/C12TV
Jumper wire
Defrost interval time changes from 40 minutes to 15 minutes.
JPC
1-second
3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
E1
E1
E1
<
MUH-C07/C09/C12TV
>
Change point
NOTE : For remodelling, take out the bat-
45
>
teries and push the
OPERATE/STOP(ON/OFF)button
twice or 3 times at first.
After finish remodelling, put back
the batteries then push the RESET
button.