Service Functions - Mitsubishi Electric MCFH-13NV-E3 Service Manual

10

SERVICE FUNCTIONS

MCFH-13NV -
E3
10-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be
accomplished regardless of the defrost interval restriction. See Page 34.
Defrost thermistor RT61 must read below -3:.
10-2. CHANGE IN DEFROST SETTING
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (See page 34.)
<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (See page 34.)
Jumper wire
JPC
JPE
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
AUTO START : 1 hour
AUTO STOP : 1 hour
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;
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.
Table1.
No.1 unit
No.2 unit
No.3 unit
No.4 unit
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.
10-5. RELEASE OF AUTO RESTART FUNCTION
The jumper line is soldered with "JHA (Refer to page 33.)" on the indoor electronic P.C. board.
Remove the auto restart P.C. board from "Connector CN104".
Defrost interval time changes from 40 minutes to 15 minutes
Deforst start temperature changes from -3: to 0:
Deforst finish temperature changes from 3: to 10:.
3-seconds
1-minute
}
Short the connector during the timer mode.
1-minute
"J1" and "J2" Jumper wires
1 unit operation 2 units operation
No modification
Change point
3 units operation
Same as at left
Cut J1
25
NOTE : For remodelling, take out the
batteries at first.
After finish remodelling, put back
the batteries then push the RESET
button.
4 units operation
Same as at left
Same as at left
Cut J2
Cut both J1 and J2
Same as at left
Same as at left
Same as at left