Field Settings
SiUS041111
226
Trial Operation and Field Settings
4.4
Facility Setting Switch (cooling at low outdoor
temperature)
Outline
This function is limited only for facilities with air conditioning targeted toward equipment. Never use
it in a residence or office where the space is occupied by people.
Detail
You can expand the cooling operation range from 10°C (50°F: normal operation) to –15°C (5°F:
cooling at low outdoor temperature setting) by turning on the switch (SW4-B) on the outdoor unit
PCB.
When the target fan speed determined by the control to maintain pressure difference remains under
150 ~ 250 rpm (depending on the model) for about 30 seconds, the fan is turned off to maintain the
pressure difference. When the pressure difference returns to high again, the fan starts to rotate again.
09/12 class
15/18/24 class
Caution
1. If the outdoor unit is installed where the outdoor heat exchanger of the unit is exposed to direct
wind, provide a windbreak wall.
2. Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off
when using facility settings.
3. Do not place humidifiers or other items which might raise the humidity in rooms where facility
settings are being used.
A humidifier might cause condensate to drip or blow from the indoor unit outlet vent.
4. Cutting jumper sets the indoor fan tap to the highest position.
J5
J4
J3
Top panel
PCB
2) Cut the jumper J3.
1) Remove the
3 screws.
(R14694)
J5 J7 J8 J6
GND
Top panel
PCB
Shield plate
3) Cut the jumper J6.
2) Remove the shield
plate.
1) Remove the
3 screws.
(R14695)
