7-1-1. Thermistor

<Thermistor characteristic graph>

 

 

 

 

 

 

Room temperature thermistor (TH21)

 

Thermistor for

 

Liquid pipe temperature thermistor (TH22)

 

lower temperature

 

 

 

 

Gas pipe temperature thermistor (TH23)

 

 

 

 

Thermistor R0=15kΩ ± 3%

 

 

Fixed number of B=3480 ± 2%

 

 

Rt=15exp { 3480(

 

1

 

 

 

1

) }

273+(t-32)/1.8

273

 

 

 

 

 

30°F

15.8kΩ

 

 

 

 

 

 

 

50°F

9.6kΩ

 

 

 

 

 

 

 

70°F

6.0kΩ

 

 

 

 

 

 

 

80°F

4.8kΩ

 

 

 

 

 

 

 

90°F

3.9kΩ

 

 

 

 

 

 

100°F

3.2kΩ

 

 

 

 

 

 

7-1-2.Linear expansion valve

Resistance (kΩ)

< Thermistor for lower temperature >

50

40

30

20

10

0

-20 0 20 40 60 80 100 120 Temperature (°F)

Operation summary of the linear expansion valve

Linear expansion valve open/close through stepping motor after receiving the pulse signal from the indoor controller board.

Valve position can be changed in proportion to the number of pulse signals.

<Connection between the indoor controller board and the linear expansion valve>

Controller board

DC12V

Linear expansion valve

Brown

6

 

 

4

Blue

 

Red

5

Drive circuit

 

 

 

 

 

 

M

6

Brown

Φ4

Blue

4

Φ4

 

 

 

 

 

 

 

 

 

 

Φ3

 

5

2

Yellow

Φ3

Orange

3

 

 

 

 

 

1

 

Φ2

 

2

Φ2

Red

3

 

Yellow

White

Orange

 

Φ1

White

1

Φ1

 

 

 

 

 

 

 

 

 

Connector(CN60)

 

 

21

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