When installing the pressure sensor, connect a lead wire to the PCB ( ), thereafter connect the other end
of a lead wire to the pressure sensor ( ). When disconnecting, do the opposite procedure.
Be careful not to install other than above procedure, otherwise the pressure sensor can be failed.
0 1.75 3.5
1
3
5
Pressure
Output
MPa
V
1) Characteristics of pressure sensor
2) Check point of replacing pressure sensor
8-5-3 ELECTRIC EXPANSION VALVE
8-5-2 PRESSURE SENSOR
Over the limit of the transmission line length.
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.
8-5-4 RB UNIT (HEAT RECOVERY TYPE ONLY)
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 discharge valve will be ON during heating operation, the suction valve will be
ON during cooling operation and the bypass valve will be ON during stopping.
8-5-5 OTHERS
1) Solving the problem is nesessary since following can be occured.
Gas leakage, capacity declining cause by gas shortage.
Dirt from the filter and the EEV.
Capacity declining by mis-setting of the indoor unit capacity.
Unfit of the refrigerant pipe.
Increasing the indoor unit by mis-piping.
Increasing the indoor unit by mis-setting the refrigerant system address.
Disconnection of the transmission line.
2) The air conditioner operates intermittently or an error message appears.
Wiring method of the transmission line.
Loose contact of the transmission line
Mis-selecting the transmission line.
Noise influences the transmission line.
In case of the specified indoor unit, the indoor unit PCB is defected.
In case of all units or the specified unit, the outdoor unit PCB is defected.
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2
1
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3
2
1
Pressure sensor
Printed circuit board
Lead wire
– 126 –
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