Mitsubishi Electronics PCH42GK, PCH24GK OC277-35, Overheat protection, Booster heater control

(1)Compressor control

13-minute time delay

To prevent overload, the compressor will not start within 3 minutes after stop.

2The compressor runs when the room temperature is lower than the set temperature.

The compressor stops when the room temperature is equal to or higher than the set temperature.

3The compressor stops in check mode or during protective functions.

4Overheat protection

<Start condition>

When the indoor coil thermistor reads 158°F 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 compres- sor operation), when operation mode changes to other mode, or when thermostat turns OFF.

(2)Indoor fan control

(a)Normal control

( i )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 dip switch SW1-5 and SW1-6.

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 tempera- ture, the indoor fan will run on EXTRA-LOW speed.

( ii )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 95°F, the fan speed changes to LOW. 2 minutes later, the hot adjustment ends. Then, the fan speed depends on the remote controller setting.

(iii)The indoor fan stops when the indoor coil temperature is within 9 degrees either way of room temperature. (iv)To eliminate the remaining heat, the indoor fan runs for the first 1 minute after the booster heater is turned OFF.

(3)Auto vane control

Auto vane position is set to 70 degrees airflow at the start-up of HEAT operation.

(a) Vane position set mode & swing mode.

( i ) Every time AIR DISCHARGE button is pressed, setting will be changed . ( ii ) Airflow direction can be changed with AIR DISCHARGE button.

horizontal 20° 40° 60° SWING

NOTE : In the following cases, the discharge direction is horizontal regardless of the remote controller setting.

1During the hot adjustment with fan speed at EXTRA-LOW

2 During defrosting with indoor fan OFF

3 During thermostat OFF

(4)Booster heater control

When the room temperature is 6 degrees below the set temperature, the booster heater will turn ON. When the room temperature is equal to the set temperature, booster heater will turn OFF.

During the hot adjustment, the booster heater will not work.

<Overheat prevention>

When the indoor coil thermistor rises to 140°F or above, the booster heater cannot work. When the indoor coil thermistor falls to 131°F or below, the booster heater can work.

OC277-35