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6. Room Temperature Thermistor Circuit
Fig. 6-1 shows the room temperature
thermistor circuit
5V
Room temperature
thermistor
Micro
computer
Room
temp. input
7. Heat exchanger temperature thermistor circuit
5V
[]
Heat exchanger
temperature thermistor
The circuit detects the indoor heat exchanger
temperature and controls the following.
(1)
Preheating.
(2)
Low-temperature defrosting during cooling
and dehumidifying operation.
(3)
Detection of. the reversing valve. non-operation
or heat exchanger temperature thermistor open.
The voltage at @ depends on the heat exchanger
temperature as shown in Fig. 7-2.
Micro computer
Heat exchanger
temperature input
4)
The voltage at @ depends on the room
temperature as shown in Fig. 6-2.
a
OO
>
mr
en
pe
ep
ee
ee ee eee
lls
Ke
Se
enema
Serena
=
1 (eR
PALS IRON Cee 6S
6
@
S
rapa
ah
a
ca—
aar
a
>
1
ree
Sa
'
:
0
10
20
30
40
Room temperature (°C)
Fig. 6-2
w >
nN
Voltage
at @ (V)
Heat exchanger temperature (°C)
Fig. 7-2
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