Mitsubishi Electronics MSH-24NV, MSH-07NV, MSH-12NV, MSH-09NV, MSH-18NV Service Functions, Table.1

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			Junper wire	Change point
MSH-07/09/12NV-		E1 E2	JPC	Defrost interval time changes from 40 minutes to 15 minutes
MSH-18NV- E1	E2	E3
			JPE	Deforst start temperature changes from -3:to 0:
MSH-24NV- E1	E2
				Deforst finish temperature changes from 3.1: to 10.1:.

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	} Short the connector during the timer mode.
AUTO STOP : 1 hour ➔ 1-minutes

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

MSH-09NV - E1

MSH-12NV - E1

MSH-18NV - E1

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

	1 unit operation	2 units operation	3 units operation	4 units operation
No. 1 unit	No modification	Same as at left	Same as at left	Same as at left
No. 2 unit	–	Replace J10 with J 11	Same as at left	Same as at left
No. 3 unit	–	–	Replace J20 with J 21	Same as at left
No. 4 unit	–	–	–	Replace J10 with J11
				Replace J20 with J21

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