8
SERVICE FUNCTIONS
7
REFRIGERANT SYSTEM DIAGRAM
6
7-1. 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. (Refer to page 17 or 18.)
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.)
7-2. 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, press the RESET button.
MCFZ-A12WV -
MCFZ-A18WV -
MCFZ-A24WV -
E1
E1
E1
Remote controller model : KG04B(MCFZ-A12WV),KG04C(MCFZ-A18/A24WV)
NOTE : For remodelling, take out the batteries 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.
J2
J1
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Flared connection
Refrigerant pipe
[
9.52
(with heat insulator)
Refrigerant pipe
[
6.35
(with heat insulator)
Muffler
INDOOR UNIT
MCFZ-A12WV-
E1
Unit : mm
Indoor
heat
exchanger
Distributor
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Flared connection
Refrigerant pipe
[
12.7(MCFZ-A18MV)
Refrigerant pipe
[
15.88(MCFZ-A24MV)
(with heat insulator)
Refrigerant pipe
[
6.35
(with heat insulator)
INDOOR UNIT
MCFZ-A18WV-
MCFZ-A24WV-
E1
E1
Refrigerant flow in cooling
Refrigerant flow in heating
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