Service manual

53
POOR COOLING
Check installation position of remo-
te control unit.
Does cool air from air conditioner
reach position directly?
Is cooling load too large?
Change installation position of
remote control unit.
Review cooling load estimate.
Charge refrigerant gas.
Open the valves fully.
Clean filter in the air intake grille.
Set the fan speed to either MEDIUM
or HIGH.
Insulate wide and narrow tubes
separately.
Replace.
Compressor is defective.
Service valves are not fully open.
Is fan speed set to LOW?
Refrigerant tubes between indoor
and outdoor units are not insulated.
Air filter is clogged.
Measure temperatures of
suction and discharge air
of air conditioner.
Refrigerant gas shortage.
Possibility of
gas shortage.
Charge refrige-
rant gas (R22
Clean filterCheck for clogging of air filter.
Use the booster cable.Long extension of ducts.
Refrigerant
flow failure
Air circula-
tion is a little
a)
P
AIR CONDITIONER OPERATES, BUT ABNORMALITIES OCCUR
YES
Temperature diffe-
rence is small
Temperature difference between
suction and discharge air is large
enough (approx. 10°C or more).
Air filter is clogged
Change installation position of remo-
te control unit.
Is remote control unit installed at a
place where it can detect room tem-
perature properly!
b) Excessive cooling
NO
OR R407C)