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Facility Setting* (cooling at low outdoor temperature)
This function is limited only for facilities (the target of air conditioning is equipment (such as computer)).
Never use it in a residence or office (the space where there is a human).
* Only for RX and RK models.
Cutting jumper 6 (J6) on the circuit board will expand the operation range down to 5°F (-15°C). However it will
stop if the outdoor temperature drops below -4°F (-20°C) and start back up once the temperature rises again.
1) Remove the top plate of the outdoor unit. (09/12 class: 3 screws, 18/24 class : 6 screws)
2) Remove the front plate. (09/12 class: 6 screws, 18/24 class : 7 screws)
3) Cut the jumper (J6) of the PCB inside.
CAUTION
● If the outdoor unit is installed where the heat exchanger of the unit is exposed to direct wind, provide a windbreak wall.
● Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off when using facility settings.
● Do not place humidifiers or other items which might raise the humidity in rooms where facility settings are being used.
A humidifier might cause dew jumping from the indoor unit outlet vent.
● Cutting jumper 6 (J6) sets the indoor fan tap to the highest position. Notify the user about this.
Location of J6 jumper is as shown below:
J6 Jumper
For Class 09 and Class 12
1. CHECKLIST BEFORE COMMISSIONING
Do NOT operate the system before the following checks are OK:
The indoor unit is properly mounted.
The outdoor unit is properly mounted.
The system is properly grounded and the ground terminals are tightened.
The fuses or locally installed protection devices are installed according to this document, and have NOT
been bypassed.
The power supply voltage matches the voltage on the identification label of the unit.
There are NO loose connections or damaged electrical components in the switch box.
There are NO damaged components or squeezed pipes on the inside of the indoor and outdoor units.
There are NO refrigerant leaks.
The refrigerant pipes (gas and liquid) are thermally insulated.
The correct pipe size is installed and the pipes are properly insulated.
The stop valves (gas and liquid) on the outdoor unit are fully open.
The following field wiring between the outdoor unit and indoor unit has been carried out according to this
document and local codes.
Drainage
Make sure drainage flows smoothly.
Possible consequence: Condensate water might drip.
The indoor unit receives the signals of the user interface.
The specified wires are used for the interconnection cable.
2. CHECKLIST DURING COMMISSIONING
To perform an air purge.
To perform a test run.
COMMISSIONING
1-14
J6 Jumper
For Class 18 and Class 24 only
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