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The high pressure sensor connection port on the outdoor unit
includes a Schrader-type, push-to-release valve. It is not necessary 
to recover the refrigerant when removing and installing the sensor.

Refer to “1. Removing Panels” and remove the front panel.

Disconnect the high pressure sensor connector (3P - BLK) from
terminal CN-HPS on the outdoor unit control PCB of the outdoor unit
where the high pressure sensor will be removed.

Use 2 adjustable wrenches in combination to remove the high
pressure sensor.

Use 2 adjustable wrenches in combination to install the high
pressure sensor.

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Prepare for installation.

• Remove the rubber stopper and tube cap (welded) from the new compressor.

Install the crankcase heater onto the compressor.

Place the cushioning rubber in the designated positions on the compressor.
(There are 3 pieces for an inverter compressor.)

Set the new compressor into the unit.

Shape the tubes and insert them at the 2 welding locations.

Use nitrogen to replace the air inside the compressor. Perform brazing at all parts.

Increase the pressure to the nitrogen airtightness test pressure of 3.80 MPa. Check that no leakage occurs.

Re-install all components that were removed. Re-install the electrical component box in the original position 
as it was before.

After the airtightness test is completed, apply vacuum until a pressure of –101 kPa {–775 mm Hg, 5 Torr} or
less is reached at the indoor and outdoor units and in the tubing.

After applying vacuum, charge with refrigerant.
For the refrigerant charging methods, refer to “Installation
Instructions.” 
Charge with the total of the “refrigerant amount at time of 
shipment” plus the “additional charge amount.” (Listed on 
the nameplate and description label.)

• Be sure to perform refrigerant charge using liquid refrigerant.

Never use any refrigerant other than R410A.

Connection port
(Schrader-type)

High pressure

sensor

Front side

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

2.  Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

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

4.  Monitoring Operations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

5.  Outdoor Unit Alarm History Monitor  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

6.  Mode Settings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

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n  About the outdoor unit maintenance remote controller

The outdoor unit utilizes nonvolatile memory (EEPROM) on 
its PCB. This allows EEPROM data to replace the setting 
switches that were present on previous 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.).

Outdoor unit maintenance remote controller does not function as an 
ordinary remote controller. It is therefore only used for test runs and 
during servicing.

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

to the outdoor unit PCB.

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

maintenance remote controller is connected.

CZ-RTC2

(Servicing No.: CV6231785082)

Special service checker wiring

Remote controller Ass’y

Operation manual included in package.

Inter-unit control wiring

Outdoor unit 

control PCB

Indoor 

unit

Indoor 

unit

Remote 

controller

Remote 

controller

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