Service Manual
Table Of Contents
Field Settings SiUS041638E
109 Trial Operation and Field Settings
4.4 Facility Setting Switch (cooling at low outdoor
temperature)
Outline This function is designed for facilities such as equipment or computer rooms. It is never to be used
in a residence or office where people occupy the space.
Details (1) Turning on SW5-3 on the PCB will extend the operation range to –10°C (14°F).
Installing an air direction adjustment grille (sold separately) will further extend the operation
range to –20°C (–4°F). In these cases, the unit will stop operating if the outdoor temperature
falls below –20°C (–4°F), restarting once the temperature rises above this level.
(2) Only for cooling models
If the unit is to be operated in outdoor temperatures down to –30°C (–22°F), turn on SW6-2 on
the PCB, in addition to the settings in step (1) above. If the outdoor temperature falls below
–30°C (–22°F) the unit will stop operating and will only restart once the temperature rises above
–30°C (–22°F).
PCB
HEAT
COOL
4
3
2
1
2
1
E
D
C
B
A
4
3
ON
OFF
2
1
SW5
Turn on switch 3.
Screw
(R24546)
Remove
the switch
cover
PCB
HEAT
COOL
4
3
2
1
2
1
E
D
C
B
A
ON
OFF
2
1
SW6
Turn on switch 2.
(R24547)