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MAINTENANCE
(Main Parts)
(2) Thermistor for Indoor Suction Air Temperature
(For Room Temperature Control)
The room temperature is controlled by the
thermistor for indoor suction air temperature
detecting the temperature at the suction air
inlet of the indoor unit.
The setting temperature is indicated on the
LCD of the wired controller by number.
Adjust the setting temperature for
prevention from excessive cooling and
heating.
It is recommended to set the temperature as follows:
Economical Cooling Operation: 81
Economical Heating Operation: 64
The resistance characteristics of thermistor is shown in the above figure.
ATTENTION:
The thermo-off value of the indoor unit air inlet thermistor is set at the temperature higher than the value
indicated on the wired controller switch by 7
air temperature during heating operation has a tendency to become higher than that of the occupied zone,
intending comfortable heating operation.
(3) Thermistor for Indoor Discharge Air Temperature (For Discharge Air Temperature Control)
The thermistor for indoor discharge air temperature is utilized for the control of prevention from cold air
discharge in heating operation, etc.
The resistance characteristics of thermistor is shown in the above figure.
When the temperature of the heat exchanger is below 32
thermostat is turned OFF automatically and over 57
thermostat is turned ON again.
(4) Thermistor for Liquid Pipe Temperature of Indoor Heat Exchanger
The resistance characteristics of thermistor is shown in the above figure.
When the temperature of the heat exchanger is below 32
thermostat is turned OFF automatically and over 57
thermostat is turned ON again.
(5) Thermistor for Gas Pipe Temperature of Indoor Heat Exchanger
The evaporating temperature in heating operation is detected.
The resistance characteristics of thermistor are shown in the above figure.
4-16
90
80
70
60
Thermistor
50
Resistance
40
30
20
10
0
o
o
o
o
F (27
C) to 84
F (29
C)
o
o
o
o
F (18
C) to 68
F (20
C)
o
o
F (4
C) and the maximum is 86
F (0
o
F (14
C),
o
o
F (0
o
F (14
C),
o
o
82
61
46
35
27
20.5
16
12.5
5
14
23
0
41
50
59
68
77
(-15)
(-10)
(-5)
(0)
(5)
(10)
(15)
(20)
(25)
Ambient Temperature (
Thermistor Characteristics
o
o
F (30
C), because the suction
C),
Prevention from freezing
o
onto the heat exchanger in
COOL and DRY operation.
C),
Prevention from freezing
o
onto the heat exchanger in
COOL and DRY operation.
10
8
5.3
3.6
2.5
86
95
104
113
122
131
140
(30)
(35)
(40)
(45)
(50)
(55)
(60)
o
C)
SM-16005-rev.2
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Troubleshooting
