MITSUBISHI ELECTRIC MSH-07NV - Manual (Page 44)

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9 SERVICE FUNCTIONS
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 56 and 59.
Defrost thermistor RT61 must read below -3°C
2. DEFROST TERMINATION CHANGE
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (See page 56 and 59.)
<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (See page 56 and 59.)
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 :
MSH-07/09/12NV-
MSH-18NV-
MSH-24NV-
Junper wire
JPC
JPE
MODEL Change point
Defrost interval time changes from 40 minutes to 15 minutes
Deforst start temperature changes from -3 : to 0 :
Deforst finish temperature changes from 3.1 : to 10.1 : .
E1 E2
E1 E2 E3
E1 E2
Originally, chip parts are fitted on J10/J20 side and there is no chip parts on the other side.
Remove the chip parts of J10/J20 side and connect Jumper wire to J11/J21 side as shown in Table 1.
Either J1O or J11 /J20 or J21 should be attached for normal operation.
NOTE : For remodeling, take out the batteries at first.
After finish remodeling, put back the batteries then push the RESET button.
3. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows.
3-minute delay : 3-minute
➔ 3-second.
AUTO START : 1 hour ➔ 1-minutes
AUTO STOP : 1 hour ➔ 1-minutes
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
1 unit operation
No modification
–
–
–
2 units operation
Same as at left
Replace J10 with J 11
–
–
3 units operation
Same as at left
Same as at left
Replace J20 with J 21
–
4 units operation
Same as at left
Same as at left
Same as at left
Replace J10 with J11
Replace J20 with J21
Short the connector during the timer mode.
}
Table.1
(1)<The reset button can be located on the rear side.>
MSH-07NV - MSH-09NV - MSH-12NV - MSH-18NV -
MSH-18NV -
E2
E1 E1 E1 E1
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.
OB207t-2qxp 25/9/97 8:55 PM Page 44