Service Functions - Mitsubishi Electric MSH-07NV Service Manual

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.)
MODEL
MSH-07/09/12NV- E1 E2
MSH-18NV-
E1 E2 E3
MSH-24NV-
E1 E2
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
AUTO START : 1 hour
AUTO STOP : 1 hour
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.
(1)<The reset button can be located on the rear side.>
MSH-07NV -
E1
MSH-18NV -
E2
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
NOTE : For remodeling, take out the batteries at first.
After finish remodeling, put back the batteries then push the RESET button.
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.
Table.1
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.
44
Junper wire
JPC Defrost interval time changes from 40 minutes to 15 minutes
Deforst start temperature changes from -3: to 0:
JPE
Deforst finish temperature changes from 3.1: to 10.1:.
3-second.
1-minutes
}
Short the connector during the timer mode.
1-minutes
MSH-09NV -
E1
1 unit operation
No modification
– Replace J10 with J 11
–
–
MSH-12NV -
E1
2 units operation
Same as at left
– Replace J20 with J 21
–
Change point
MSH-18NV -
E1
3 units operation
Same as at left
Same as at left
Replace J10 with J11
–
Replace J20 with J21
4 units operation
Same as at left
Same as at left
Same as at left