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Disturbance Cause Trouble-shooting Remedy
Ice blockage in
capillary tube.
Heat injection area on
evaporator with cloth
with hot water. If
refrigerant now can be
heardtoflowmore
quickly through the
system, ice blockage in
capillary tube is indicated.
Alternatively, stop
compressor and let
evaporator defrost and
start compressor again. In
case of ice blockage, frost
formation on the
evaporator will increase
initially and then return to
its original level.
Blow N2 through system.
Install outsize service
filter. Ensure careful
evacuation. Start
compressor. Stop when
warm. Evacuate system
again. With heavy
contamination of system
it is necessary to repeat
this process several
times. Filter can be
replaced again.
No or very little
compressor capacity.
Mount a service valve on
charging pipe and check
suction pressure. Pressure
conditions indicate no or
very little compressor
capacity. Test
compressor.
If volumetric check
indicates insufficient
compressor capacity,
replace compressor. Note
that defects in the
compressor can be caused
by complete or partial
blockage at another point
in the system. This
situation must be
remedied before a new
compressor is installed.
Capillary tube
mounted incorrectly
at injection site (roll-
bond evaporator).
Symptoms resemble those
of loss of refrigerant.
Replace refrigerating
evaporator.
Insufficient
refrigerating/freezing.
Thermostat is set too
high.
Turn thermostat knob
clockwise. Check to
ensure that phial is
correctly installed.
Replace thermostat.
7.