Toshiba MMU-AP0091H service manual Check at Main Power-ON, Address Setup and Check Procedure

8-3. Check at Main Power-ON

After turning on the main power of the indoor units and outdoor unit in the refrigerant line to be executed with a test operation, check the following items in outdoor and each indoor unit.

(After turning on the main power, be sure to check in order of indoor unit → outdoor unit.)

If the power supply of the outdoor unit has been firstly turned on, [E19] appears on the 7-segment display on the interface P.C. board until the power supply of the indoor unit is turned on. However it is not an error.

Check on outdoor unit

1.Check that all the rotary switches, SW01, SW02, and SW03 on the interface P.C. board of the outdoor unit are set up to “1”.

2.If other error code is displayed on 7-segment [B], remove the cause of trouble referring to “9. Troubleshooting”.

3.Check that [L08] is displayed on 7-segment display [B] on the interface P.C. board of the outdoor unit. (L08: Indoor address unset up)

(If the address setup operation has already finished in service time, etc, the above check code is not dis- played, and only [U1] is displayed on 7-segment display [A].)

7-segment display [A] 7-segment display [B]

Interface P.C. board

88

SW01 SW02 SW03

Check on indoor unit

1.Display check on remote controller (In case of wired remote controller)

Check that a frame as shown in the following left figure is displayed on LC display section of the remote controller.

8-4. Address Setup

After power-ON, set up the indoor address from the interface P.C. board of the outdoor unit.

(The address setup operation cannot be performed by power-ON only. )

8-4-1. Cautions

1.It requires approx. 5 minutes usually for 1 line to automatically set up address. However in some cases, it may require maximum 10 minutes.

2.It is unnecessary to operate the air conditioner for address setup.

3.Manual address setup is also available besides automatic setup.

Automatic address: Setup from SW15 on the interface P.C. board of the outdoor unit

Manual address: Setup from the weird remote controller.

(For details, refer to section “8-4-3. Address setup procedure”)

8-4-2. Address Setup and Check Procedure

Procedure	Item			Operation and check contents
1	Indoor unit power-ON	Turn on power of indoor unit in refrigerant line to which address is set up.
2	Outdoor unit power-ON	Turn on power of all the outdoor units in refrigerant line to which address is set up.
3	7-segment display	Check that [L08] is displayed on 7-segment display [B] on the interface P.C. board of the
	check	outdoor unit in the system to which address is set up.
		Confirm the corresponding items in “8-4-3 Address setup procedure”, and then set up address
4	Address setup start	according to the operation procedure.
		(Be sure that the setup operation may differ in group control or central control.)
		Note) Address cannot be set up if switches are not operated.
	Display check after	•	After address setup, [U1] [	] are displayed in 7-segment display section.
5		•	If an error code is displayed in 7-segment display [B], remove the cause of trouble referring to
	setup
			“9. Troubleshooting”.
		Using 7-segment display function, check the system information of the scheduled system.
		(This check is executed on the interface P.C. board of the outdoor unit.)
					Rotary switch setup			7-segment display
6	System information				SW01	SW02	SW03	[A]	[B]
	check after setup		System capacity		1	2	3	[No. of HP]	[HP]
			No. of connected outdoor unit		1	3	3	[Connected No. of units]	[ P]
			No. of connected indoor units		1	4	3	[Connected No. of units]
		After the above checks, return rotary switches SW01, SW02, SW03 to 1/1/1.

GOOD

TEMP.		ON / OFF
TIMER SET	FAN	MODE
TIME	SWING/FIX	VENT
FILTER
RESET TEST SET CL	UNIT

NO

GOOD

TEMP.		ON / OFF
TIMER SET	FAN	MODE
TIME	SWING/FIX	VENT
FILTER
RESET TEST SET CL	UNIT

	7-segment	Push-switch	Push-switch
Interface P.C. board	display [A]	SW04	SW05
			Push-switch
			SW15
			7-segment
			display [B]

Normal status	Abnormal status
(Power and operation stop)	(Power is not normally turned on.)

If a frame is not displayed as shown in the above right figure, the power of the remote controller is not normally turned on. Therefore check the following items.

•Check power supply of indoor unit.

•Check wiring between indoor unit and remote controller.

•Check whether there is cutoff of cable around the indoor control P.C. board or not, and check connection failure of connectors.

•Check failure of transformer for the indoor microcomputer.

•Check indoor control P.C. board failure.

SW01 SW02 SW03

Rotary switches