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AIR CONDITIO-
NING
AIR CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table
Principal problem Symptom Possible causes
Low pressure normal and high pressure
Presence of air in the aircon circuit
too high
Low pressure normal and high pression too Aircon pressostat defective
low
Evaporator sensor defective
Abnormal levels of pressure Low pressure too high and high pressure
normal
Aircon pressure reducer jammed open
Low pressure too low and high pressure
Filtering and drying cartridge saturated or
normal
clogged
Aircon pressure reducer iced up
Under-cooling too weak Lack of aircon fluid
Air conditioning operating in back-up mode Excess aircon fluid
Under-cooling excessive Presence of air in the aircon circuit
Filtering and drying cartridge clogged
NOTE: In all cases, measure the excessive heating (SC) and the blown air temperature.
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