Field Settings SiUS04-924_A
Trial Operation and Field Settings 187
4.4 Facility Setting Switch (cooling at low outdoor
temperature)
Outline This function is limited to facilities where the target of air conditioning is equipment Never use it in a
residence or office occupied by people.
Detail You can expand the cooling operation range from –10°C (14°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.
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 dew jumping from the indoor unit outlet vent.
4. Use the indoor unit at the highest level of airflow rate.
4.5 Jumper and Switch Settings
For the location of the jumper and the switch, refer to the following pages.
Indoor unit; page 8
Outdoor unit; page 11
SW4
ON
ABCD
SW1
(R14478)
Turn on
the switch
SW4-B.
LED-A
S2
S102
Jumper Function When connected
(factory set)
When cut
JB (on indoor unit
PCB)
Fan speed setting when compressor
stops for thermostat OFF. (effective
only at cooling operation)
Fan speed setting;
Remote controller
setting
Fan rpm is set to “0” <Fan stop>
JC (on indoor
unit PCB)
Power failure recovery function Auto-restart The unit does not resume operation
after recovering from a power failure.
Timer ON/OFF settings are cleared.
Switch Function OFF (factory set) ON
SW4-C (on
outdoor unit
PCB)
Improvement of defrost
performance
Standard control Reinforced control (ex. The frequency
increases, the duration time of defrost
lengthens.)
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