Service manual

44
POOR COOLING OR
POOR HEATING
Check installation position of
remote control unit.
Does cool or heat air from air
conditioner reach position directly?
Is heating or cooling load too
large?
Change installation position of
remote control unit.
Review heating or 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.
Replace.
4 way valve is defective.
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
refrigerant gas
(R22 OR 407C)
Clean filterCheck for clogging of air filter.
Use the booster cable.Long extension of ducts.
Refrigerant
flow failure
Replace.Indoor coil sensor is defective.
Air
circulation is
a little
Replace.
4 way valve is defective.
Cold air is
discharged
Replace P.C.B. Ass’y in the indoor unit.
“STANDBY” is displayed.
Cold draft
prevention is
mal function
a)
M
AIR CONDITIONER OPERATES, BUT ABNORMALITIES OCCUR
YES
Temperature
difference 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
remote control unit.
Is remote control unit installed at a
place where it can detect room
temperature properly!
b) Excessive cooling or heating
NO