41
SERVICE FUNCTIONS
10
10-3. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.
The time will be shortened as follows.
3-minutes time delay : 3-minutes
→
3-seconds
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.)
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;
Table1.
10-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JP607 and R853 (MUCFH-13/18NV) / JPG1 and R871 (MUCFH-24NV) on the outdoor
deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction.
Defrost thermistor RT61 must read below -3
:
. (Refer to page 53 or 54.)
10-2. CHANGE IN DEFROST SETTING
MUCFH-13/18NV
<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. (Refer to page 53.)
MUCFH-24NV
<JRF> When the JRF wire of the deicer P.C. board is cut, the defrost interval time will be changed.
<JRG> When the JRG wire of the deicer P.C. board is cut, the defrost temperature will be changed. (Refer to page 54.)
Jumper wire
JPC
JPE
JRF
JRG
Model
MUCFH-13NV-
MUCFH-18NV-
MUCFH-18NV-
MUCFH-24NV-
Change point
Defrost interval time changes from 40 minutes to 15 minutes.
Defrost start temperature changes from -3
:
to 0
:
.
Defrost finish temperature changes from 3.1
:
to 10.1
:
.
Defrost interval time changes from 40 minutes to 15 minutes.
Defrost start temperature does not change.(-3.0
:
)
Defrost finish temperature changes from 3.1
:
to 15
:
.
E4
E3
E3
E4
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
1 unit operation
No modification
–
–
–
2 units operation
Same as at left
Solder J1
–
–
3 units operation
Same as at left
Same as at left
Solder J2
–
4 units operation
Same as at left
Same as at left
Same as at left
Solder both J1 and J2
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.
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the
remote controller for the indoor unit.
The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they
are set.
The setting will be cancelled if the breaker has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
MCFH-13NV -
MCFH-24NV -
MCFH-18NV -
E3
E3
E4
MUCFH-13NV -
MUCFH-18NV -
MUCFH-18NV -
MUCFH-24NV -
E3
E3
E4
E4
OB267--2.qxp 01.12.19 3:00 PM Page 41
