Troubleshooting
SiBE811001EB
319
CONVENI-PACK
9.1.2 Errors due to Faulty Connections
1. Errors, which will occur if no external equalizer pipe is connected
The pressure P
2
, which is described under "Operation principle" section, becomes zero.
··· The electronic expansion valve remains open.
Since the valve remains fully open, the liquid refrigerant excessively enters the evaporator.
As a result, the portion of liquid refrigerant that cannot evaporate returns to the compressor,
thus resulting in defective compressor.
There are refrigerant leaks from the external equalizer pipe joint of the electronic expansion
valve.
2. Errors, which will occur if the feeler bulb does not sense a proper temperature
3. Errors, which will occur if the external equalizer pipe and the feeler bulb are mounted
in reverse position
Feeler bulb
The liquid refrigerant flows out.
This pressure is low.
The valve
remains open.
Normally, the liquid refrigerant are
all vaporized around this area.
The liquid refrigerant makes up
the major portion of the pipe.
If no feeler bulb is connected (left in the air):
The internal pressure of the feeler bulb will remain
high.
The pressure P
1
will remain in a high level, thus
keeping the valve fully open.
If the feeler bulb is not mounted in a proper position:
The feeler valve will be unable to follow the evaporator
outlet temperature, thus resulting in liquid return.
Feeler bulb
Suction pipe
Equalizer pipe
Liquid return
→
Defective compressor
Feeler bulb
Equalizer pipe
Suction pipe
Equalizer pipe
Feeler bulb
The feeler bulb senses proper temperatures of the
suction pipe without having influence of the refrigerant
flow leaking from the external equalizer pipe.
The feeler bulb will have influence of the refrigerant
flow leaking from the external equalizer pipe.
In other words, the feeler bulb feels temperatures
lower than actual temperatures of the suction pipe,
thus reducing the refrigerant quantity passing
through the electronic expansion valve.
→
Refrigerating capacity will become insufficient.
