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2.18.5 Procedure
High pressure sensor connection on main
High pressure sensor has short-circuited or
Excess refrigerant
System contains air or nitrogen
The high pressure side is blocked, caused
by crushed or bent pipe or blocked EXV
The condenser heat exchange is poor
Replace outdoor main PCB
Notes:
1.
Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has
failed.
2.
Excess refrigerant causes discharge temperature to be lower than normal, discharge pressure to be higher than normal and suction pressure to be higher
than normal.
3.
Air or nitrogen in the system causes discharge temperature to be higher than normal, discharge pressure to be higher than normal, compressor current to
be higher than normal, abnormal compressor noise and an unsteady pressure meter reading.
4.
High pressure side blockage causes discharge temperature to be higher than normal, discharge pressure to be higher than normal and suction pressure to
be lower than normal.
5.
In cooling mode check outdoor heat exchangers, fans and air outlets for dirt/blockages. In heating mode check indoor heat exchangers, fans and air outlets
for dirt/blockages.
P1
PCB is loose
No
1
failed
No
2
No
3
No
4
No
5
No
Atom B Series VRF 50/60Hz
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
Discharge part of the refrigerant. Add oil if
Yes
it leaks during discharge
Flush all refrigerant then vacuum the
Yes
system and recharge the refrigerant. Add
oil to the system if it leaks
Yes
Inspect the system and fix the error
Yes
Inspect the system and fix the error
67
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