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6-1

1-1. Overview ........................................................................................................................ 6-2

1-2. Functions ........................................................................................................................ 6-3

1-3. Ordinary Display Controls and Functions ....................................................................... 6-4

1-4. Monitoring Operations .................................................................................................... 6-9

1-5. Outdoor Unit Alarm History Monitor ............................................................................. 6-11

1-6. Setting the outdoor unit EEPROM data ........................................................................ 6-12

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  About the outdoor unit maintenance remote 

The outdoor unit utilizes nonvolatile memory (EEP-
ROM) on its PCB. This allows EEPROM data to 
replace the setting switches that were present on pre-
vious PCBs. The outdoor unit maintenance remote 
controller is used to set and change these EEPROM 
data.
In addition to setting and checking the outdoor unit 
EEPROM data, this remote controller can also be 
used to monitor the outdoor unit alarm history, monitor 
the various indoor and outdoor temperatures, and 
check the indoor unit connection status (number of 
units, operating mode, etc.).

•  

The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller 
to the outdoor unit PCB.

•  

Ordinary remote controllers or other controllers are still required for the indoor units, even when the outdoor unit 
maintenance remote controller is connected.

Special service checker wiring
(Servicing No. CV6231785082)

Remote controller Ass'y

* Operation manual included in package.

Outdoor unit
control PCB

Indoor unit

Indoor unit

Remote 
controller

Remote 
controller

Inter-unit control wiring

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 Functions on the ordinary display

(1) Press the buttons to execute the following functions.

•  All indoor units stop/start

• Cooling/heating change

•  All indoor units test run

(2) Display: The following displays are possible.

• Alarm display

•  No. of indoor/outdoor units

•  Unit Nos. of connected indoor/outdoor units

•  Operating status of indoor/outdoor units (Blinks when alarm occurs.)

•  Indoor thermostat ON

•  Display of individual outdoor unit alarms

•  Total operating time of outdoor unit compressors

•  Oil level of the outdoor unit oil sensor

•  Total outdoor unit power ON time

•  Outdoor unit microcomputer version, other information

 Temperature monitor

Displays the temperature from each indoor/outdoor sensor.

 Outdoor unit alarm history monitor

Displays the outdoor unit alarm history.

 Settings the outdoor unit EEPROM data

Settings mode 1 and settings mode 2 can be used to make outdoor unit EEPROM data settings.

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 Functions on the ordinary display

Connect the special service checker wiring to the outdoor unit PCB.
The connection diagram is shown below.

•  If the communications line in the inter-unit control wiring is connected, it can be left as-is.

•  In the case of an independent outdoor unit (1 maintenance remote controller connected to 1 outdoor unit, 

automatic address setting for indoor units not completed), both setting mode 1 and setting mode 2 can be used 
for outdoor unit EEPROM data settings.

•  The overall system status for that refrigerant system is displayed.

Special service checker wiring

PCB connector (3P, blue)

RC (3P, blue)

Outdoor unit PCB

Relay connector (2P, white)

Remote controller Assy

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