Service manual

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(1) Compressor control
1 3-minute time delay
To prevent overload, the compressor will not start within 3 minutes after stop.
2 The compressor runs when the room temperature is higher than the set temperature.
The compressor stops when the room temperature is equal to or lower than the set temperature.
3 The compressor stops in check mode or during protective functions.
4 Overheat protection.
<Start condition>
When the indoor coil thermistor reads 70: or above, the overheat protection will start.
<Overheat protection>
The compressor stops for 6 minutes, and then restarts.
If the start condition is satisfied again within 10 minutes of compressor operation, both the indoor and outdoor units stop,
displaying a check code of “P6” on the remote controller.
<Termination conditions>
Overheat protection is terminated when the start condition is not satisfied again during the allowance (10-minute
compressor operation), when operation mode changes to other mode, or when thermostat turns OFF.
(2) Indoor fan control
(a) Normal control
(!)The indoor fan runs on EXTRA-LOW speed during the thermostat OFF.
EXTRA-LOW speed can be changed to LOW or HIGH speed by setting the Jumper resistance J1 and J1-8. If the
indoor coil temperature becomes more than 5 degrees below the room temperature during the thermostat OFF, the
indoor fan will stop. After, when the indoor coil temperature becomes within 5 degrees of room temperature, the
indoor fan will run on EXTRA-LOW speed.
(@)Hot adjustment
Hot adjustment is a warm-up for HEAT operation.
<Start conditions>
The hot adjustment works under any of the following conditions.
● HEAT operation starts.
● Defrosting ends.
● Thermostat turns ON.
<Hot adjustment>
Initially, the indoor fan runs on EXTRA-LOW speed. When 5 minutes have passed or the indoor coil temperature
exceeds 35:, the fan speed changes to LOW. Two minutes later, the hot adjustment ends. Then, the fan speed
depends on the remote controller setting.
(#)The indoor fan stops when the indoor coil temperature is within 5 degrees either way of room temperature.
($)To eliminate the remaining heat, the indoor fan runs for the first 1 minute after the booster is turned OFF.