120
SERVICE FUNCTIONS
12
12-1. COMPULSORY DEFROSTING MODE FOR SERVICE
<
MUH-07/09/12RV
>
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. (See page 143.)
Defrost thermistor RT61 must read below -3°C.
12-2. CHANGE IN DEFROST SETTING
<
MUH-07/09/12RV
>
W
MXZ-18/32RV is not equipped with this function.
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (See page 143.)
<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (See page 143.)
12-4. 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.
MUH-07RV -
MUH-09RV -
MUH-12RV -
Jumper wire
JPC
JPE
MODEL
Change point
Defrost interval time changes from 40 minutes to 15 minutes
Deforst start temperature changes from -3
:
to 0
:
Deforst finish temperature changes from 3.1
:
to 10.1
:
.
E1
E1
E1
12-3. 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.
3-minutes delay : 3-minutes
➔
3-seconds.
AUTO START : 1 hour
➔
1-minute
AUTO STOP : 1 hour
➔
1-minute
Short the connector during the timer mode.
}
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”.Jumper wires are mounted to each “J1” and “J2”.Cut J1 and J2 according to the
number of indoor unit as shown in Table 1.
After modification,push the reset button.
NOTE : For remodelling, take out
the batteries at first.
After finish remodelling, put
back the batteries then
push the RESET button.
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
1 unit operation
No modification
–
–
–
2 units operation
Same as at left
Cut J1
–
–
3 units operation
Same as at left
Same as at left
Cut J2
–
4 units operation
Same as at left
Same as at left
Same as at left
Cut both J1 and J2
Table.1
NOTE : At power supply failure or installation, indoor unit deletes the memory about remote controller. When the power supply
is turned on and indoor unit receives the first signals from the remote controller, the remote controller number is desig-
nated as the indoor unit number. Therefore at and after the second time indoor unit accepts the remote controller of
the initial setting number.
At setting - error, turn the power supply off to cancel the individual operation and then turn the power
supply on to restart the setting.
MUH-07RV -
MUH-09RV -
MUH-12RV -
E1
E1
E1
MU-07RV -
MU-09RV -
MU-12RV -
E1
E1
E1
MSC-07RV -
MSC-09RV -
MSC-12RV -
E1
E1
E1
MUX-10RV -
MUX-18RV -
MUX-24RV -
E1
E1
E1
MXZ-18RV -
MXZ-32RV -
E1
E1
