Refrigerant System Diagram; Service Functions - Mitsubishi Electric MCFZ-A12WV Service Manual
Hide thumbs
Also See for MCFZ-A12WV:
- Operating instructions manual (13 pages) ,
- Installation manual (14 pages)
Table of Contents
Advertisement
6
REFRIGERANT SYSTEM DIAGRAM
MCFZ-A12WV-
E1
INDOOR UNIT
Muffler
Indoor coil
Indoor
thermistor
heat
exchanger
RT12
Room temperature
thermistor
RT11
7
SERVICE FUNCTIONS
MCFZ-A12WV -
E1
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
Set time : 1 minute
Set time : 3 minute
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;
Remote controller model : KG04B(MCFZ-A12WV),KG04C(MCFZ-A18/A24WV)
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.
Refrigerant pipe [9.52
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe
[6.35
(with heat insulator)
MCFZ-A18WV -
E1
3-seconds
1-second
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.)
J2
J1
MCFZ-A18WV-
MCFZ-A24WV-
INDOOR UNIT
Indoor
heat
Distributor
exchanger
Indoor coil
thermistor
RT12
Room temperature
thermistor
RT11
Refrigerant flow in cooling
Refrigerant flow in heating
MCFZ-A24WV -
E1
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.
8
E1
E1
Refrigerant pipe [12.7(MCFZ-A18MV)
Refrigerant pipe [15.88(MCFZ-A24MV)
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe
[6.35
(with heat insulator)
Unit : mm
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
