10.5 Electromagnetic valve
(1)
Defrost electromagnetic valve
It is installed in order to flow hot gas into the
evaporator side when defrosting.
How to determine defective or not defective:
When continuity of the lead between
1
and
2
is
measured, the coil is normal if there is continuity
and if not, it is defective.
Before the coil is electrified, the temperature at the
inlet and outlet of refrigerant differs. So if the
temperature becomes the same after the coil is
electrified, the plunger is operating normally.
If the temperature differs the plunger is stuck.
Easy way to find out the problem:
When you electrify the coil with your hand
touching the electromagnetic valve, it is normal if
your hand feels a shock as the plunger goes up
with a click sound.
(2)
Liquid injection electromagnetic valve
It opens when delivery temperature (at the sensor)
of the compressor becomes more than 125°C,
keeping the delivery temperature from becoming
high.
How to determine defective or not defective:
Same as defrost electromagnetic valve.
Refer to "defrost electromagnetic valve".
10.6 Check valve
It is installed to prevent the refrigerant from flowing
back ward.
How to determine defective or not defective:
Make a judgment by the difference of temperature at
the inlet and outlet of the check valve and replace it if it
is leaking.
10.7 Receiver
It reserves the refrigerant which has been liquefied by
the condenser.
The receiver has a dissolving stopper which will melt
and discharge the refrigerant in order to prevent a
danger due to unusual high temperature.
When the stopper has been melted, replace it with a
new one.
– 15 –
Defrost electromagnetic valve
Liquid injection electromagnetic valve
Arrow mark
Disk
Main valve
Spring
Check valve
Receiver
