Outline of Control (Indoor Unit)
SiUS281117
Function and Control
53
Heating
When heating, the hot air rises to the top of the room, resulting in the temperature being lower
near the floor where the occupants are. When controlling by suction air thermistor (
) only, the
unit may therefore be turned OFF by the thermostat before the lower part of the room reaches
the set temperature. The temperature can be controlled so the lower part of the room where the
occupants are does not become cold by widening the range in which room temperature
thermistor in remote controller can be used so that suction air temperature is higher than the set
temperature.
Ex: When heating
Assuming the set temperature in the figure above is 75°F, and the suction air
temperature has changed from 64°F to 82°F (A
D):
(This example also assumes there are several other air conditioners, the system is OFF, and
that temperature changes even when the thermostat is OFF.)
Suction air thermistor (
) is used for temperatures from 64°F to 77°F (A
C).
Room temperature thermistor in remote controller is used for temperatures from 77°F to 82°F
(C
D).
And, assuming suction air temperature has changed from 82°F to 64°F (D
A):
Room temperature thermistor in remote controller is used for temperatures from 82°F to 73°F
(D
B).
Suction air thermistor (
) is used for temperatures from 73°F to 64°F (B
A).
Note:
For FTQ: Remote sensor (Optional accessory)
Set temperature
(Ts)
˚F
˚F
90
86
82
79
75
72
68
64
60
54
57
60
64
68
72
75
79
82
86
90
93
Range in which room temperature
thermistor in remote controller can
be used
Range in which suction
air thermistor (
∗
) can be
used
Suction air temperature (TH1)
Differential
