9-4-1. Poor cooling.
Is remote control unit placed where it can detect room temperature properly ?
Are wide and narrow tubes between indoor unit and outdoor unit insulated ?
Yes
No
No
Change position of remote control unit.
Insulate both wide and narrow tubes separately and then tape together.
Measure temperature of suction and discharge air of air conditioner.
Is temperature difference between suction and discharge air large enough ? (approx. 10 deg. or more).
Yes
If temperature difference is small, possibility of gas shortage.
Charge refrigerant gas (R22).
Check for clogging of air filter.
Is fan speed set to LOW ?
If performance of air conditioner is normal, review cooling load estimate.
Yes
If air filter is clogged, clean the filter.
Set fan speed to either HIGH or MEDIUM.
Reduce cooling load or replace the air conditioner with larger capacity.
9-4-2. Excessive cooling.
Is set temperature suitable ?
No
Set temperature to higher value using temperature setting buttons of the remote control unit.
Is remote control unit placed where it can detect room temperature properly ?
No
Change position of remote control unit.
50
