"Reading" the sight glass at ambient temperatures above 70
0
F (21
0
C) ~
when the system is operating, will help to determine whether the refrigerant
charge is sufficient. After about 5 to 10 minutes of compressor operation, the
appearance of slow moving bubbles (vapor) indicates a slight shortage of
refrigerant. Foam or a heavy stream of bubbles indicates the system is very low
on refrigerant. Oil streaks on the sight glass indicate a complete lack of
refrigerant.
No bubbles in the sight glass may also indicate a full, over charge or a
complete loss of refrigerant. Start the engine and run at about 1500rpm. Whi Ie
looking at the sight glass, have someone turn the air conditioning control on
and off. When the control is off, bubbles will appear if refrigerant is in the
system and will disappear when the control is on. If no bubbles appear during
the on-off cycle, it indicates there is no refrigerant in the system.
However, if the sight glass is generally clean and the cool ing performance
of the system is satisfactory, occasional bubbles do not indicate a refrigerant
shortage.
NOTE: Under conditions of extremely high temperatures, occasional
foam or bubbles may appear in the sight glass.
NOTE: If during the course of operation, you notice the air conditioning
stops working, the first thing to check is the refrigerant as described. If the
refrigerant is okay, and the system is still not working, check the evaporator, it
could be frozen up due to a dirt plugged condenser. In this case it will be
necessary to defrost the evaporator by turning off the air conditioner and when
it is dry - clean the condenser with compressed air. If the air conditioner still
does not function properly, see your Case Dealer.
CAUTION:
Never attempt to service the air conditioning system unless
A
you are completely familiar with air conditioning and the safety precautions
which must be followed when handling liquid refrigerant, which can cause
severe and painful frostbite. Contact your Authorized Case Dealer, who is
experienced in serivicing and hanOdlingof refrigerants.
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