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filter ,recharge refrigerant after evacuating ,and then seal the harging port .
3) There is air left in the refrigerating system
ANALYSIS OF TROUBLE
residual air in the refrigerating system will reduce its refrigerating efficiency .The rominent phenomena
are the increase in it s gas suction and exhaust pressures however ,the gas exhaust pressure will not
exceed its rated value ),obvious in crease in emperature in the segment from the compressor outlet to
the condenser inlet .Because here is air in the system ,both the gas exhaust pressure and temperature
will rise ,and oreover ,the gas flowing sound is intermittent and obviously louder .
REMEDY
After shut down for sever al minutes ,open the tubi ng ,evacuate it and then r echarge the System with
refrigerant .
4) Low efficiency of compressor
ANALYSIS OF TROUBLE
Low ef ficiency of a refrigeratin
g compressor re fers to the actual r
eduction of g as discharg e
Capacity ,and hence the corresponding reduction of refrigerating capacity ,under the Condition that the
refrigerant in the system is unchanged .This phenomenon occurs mostly When the co mpressor has
been used for quite a lo ng time ,it s moving parts have worn to a Conside rable degree ,fit clearance
between various parts have increased and sealing Property of its gas valve has deteriorated ,resulting
in an decrease in its actual gas Discharge capacity .
METHODS OF JUDGMENT
Measure the high and low pressures with pressu
re gauges to see whether they are Normal .If an
abnormal sound comes from the compressor or th e te mperature of its Causing is too h igh ,Cut the
discharge port open and operate the compressor ,feel it if There is pressure at the discharge port with
your finger (For a normal compressor ,its Discharge port is difficult to be blocked with your finger if you
just apply a little effort).
5) Too thick frost layer formed on evaporator
ANALYSIS OF TROUBLE
If a direct cooling r efrigerator is to be used for
a prolo nged period of time ,be sure to defrost it s
evaporator regularly ;if you fail to do so ,the fros t layer on the evaporator tubing will become thicker
and thicker .Heat conduction will be severel
y af fected when the whole tu bing is wrapped with
a
transparent ice layer ,and finally the temperature in the refrigerator cannot drop down to the prescribed
range .
REMEDY
turn the refri gerator off ,and make pre parations for defrosting ,open th e refrigerator door to let the air
come in ,or use a fan to speed up air flowing so a s to shorten the time nee ded for d efrosting .Never
strike the frost layer with any iron to ols or wood stick in order to avoid d amage to the evap orator
tubing .
6) Refrigerating oil left in evaporator tubing
analysis of Trouble
During th e process of refrigerating cycles ,a little refriger ating o il may remain in th e eva porator
tubing ,and af ter a longer time of o
peration ,if ther e is considerable ref rigerating oil lef t in the
evaporator ,the heat conduction ef fect will be severely af fected ,thus causing a poor refrigerating
effect .
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