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SERVICE FUNCTIONS10
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
AUTO START : 1 hour → 1-minute
AUTO STOP : 1 hour → 1-minute
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;
}
Short the connector during the timer mode.
Table1.
MCFH-13NV - MCFH-24NV -
MCFH-18NV -
E3
E3E4
MUCFH-13NV - MUCFH-24NV -
MUCFH-18NV -
E3
E3E4
10-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JP607 and R853 (MUCFH-13/18NV) / JPG1 ans R871 (MUCFH-24NV) on the outdoor
deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (See Page 53 or 54.)
Defrost thermistor RT61 must read below -3:.
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. (See page 53.)
<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (See 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 53.)
10-5. RELEASE OF AUTO RESTART FUNCTION
Solder JHA (refer to page 52) with a jumper line on the indoor electronic control P.C. board.
Remove the auto restart assy from “Connector CN104”.
Jumper wire
JPC
JPE
JRF
JRG
Model
MUCFH-13NV-
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
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 designated 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.
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.
OB267--2.qxp 01.4.13 1:01 PM Page 41
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