9-4. Air conditioner operates, but abnormalities are observed.
9-4-1. Poor cooling.
9-4-2. Excessive cooling.
NO
NO
• Set temperature is suitable.
Set temperature to higher
value using temperature
setting buttons of the remote
control unit.
• Remote control unit is placed where
it can detect room temperature
properly.
Change position of remote
control unit.
Air filter is clogged.
NO
YES
Temperature
difference
is small.
YES
Temperature difference between
suction and discharge air is
large enough (approx. 10 deg. or more).
Possibility of
gas shortage.
YES
• Check position of remote control unit.
Cool air from air conditioner reaches
position directly.
•
Change position of remote
control unit.
• Wide and narrow tubes between
indoor unit and outdoor unit are
insulated.
Insulate both wide and narrow
tubes separately and then
tape together.
• Measure temperature of suction and
discharge air of air conditioner.
Charge refrigerant
gas (R22).
Check for clogging of air filter.
• Fan speed is set to LOW.
Clean filter.
Set fan speed to either
HIGH or MEDIUM.
• Review cooling load estimate,
if performance of air conditioner is
normal.
Reduce cooling load or
replace the air conditioner
with larger capacity.
50
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