Pressure Sensor; Electric Expansion Valve; Rb Unit - Fujitsu R407C Service Manual

7-2-2 PRESSURE SENSOR

1) Characteristics of pressure sensor
V
5
3
1
0
Pressure
0.00
(MPa)
Output
0.00
(V)
Pressure
1.60
(MPa)
Output
2.81
(V)
2) Check point of replacing pressure sensor
Pressure sensor
When installing the pressure sensor, connect a lead wire to the PCB (
of a lead wire to the pressure sensor (
Be careful not to install other than above procedure, otherwise the pressure sensor can be failed.

7-2-3 ELECTRIC EXPANSION VALVE

When the electric expansion valve is locked cause by failure, it emits click noise. Confirming the noise
emission is done by touching any implement like a screw driver.

7-2-4 RB UNIT

When the RB unit is failed, it can be concerned one of the valve such as discharge valve, suction valve
and bypass is locked. The relation between open/close status of each valve of RB unit and operating mode
is shown in 4-3-1.
1.75 3.5
Pressure
OUTPUT VOLTAGE OF THE PRESSURE SENSORS ( HP,LP )
0.10 0.20 0.30 0.40
1.11 1.21 1.33
1.45
1.80 2.00 2.20 2.40
3.05 3.28 3.50 3.73
Lead wire
Printed circuit board
). When disconnecting, do the opposite procedure.
MPa
0.60
0.50 0.70
1.56 1.80
1.68
2.60 2.80 3.00
3.96 4.41
4.20
), thereafter connect the other end
07-04
0.80 0.90 1.00 1.20
2.13 2.36
1.91 2.01
3.20 3.40 3.50
4.65 4.88 4.98
1.40
2.60