Specifications

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(10) Protective control function

(a) Dew condensation prevention control for cooling operation

This prevents dew condensation, in the indoor unit, from occurring.

1) Operating condition: when 52C is kept ON for 30 min. after the unit starts operation.

2) Operation content: forces the indoor fan to change from Speed 1 to Speed 2.

3) Resetting condition: When 52C is off, or when dew condensation prevention control has been operating continu-

ously for 30 minutes.

(b) Frost prevention for indoor heat exchanger [Preventing frost accumulation on the indoor heat exchanger]

During the Cooling or Dry operation in low room air temp. condition, evaporating temperature will decrease and conse-

quently indoor heat exchanger sometimes gets clogged with frost (or ice).

In order to prevent this trouble, compressor is stopped by under mentioned condition by indoor heat exchanger sensor (Th

and timer (built into micro computer circuit) functions.

Also indoor fan is changed over to speed 1.

CM, FMO stoppage condition

1 Temperature of heat exchanger is

2.5˚C or lower.

2 As least 3 minutes has passed since

the compressor started.

Indoor heat exchanger

temperature (˚C)

CM, FMO re-starting condition

1 Temperature of heat exchanger is

8˚C or higher.

2 As least 3 minutes has passed since

the compressor stopped.

Set fan

speed

speed 1

(d) Self diagnosis function

When something abnormal happens on the outdoor unit, indoor unit fan motor and each thermistor (heat exchanger, room

temperature, ) it will be indicated by flashing lamps.

1) Abnormality of outdoor unit: When the indoor heat exchanger temperature does not fall to 25ºC or below for 40

minutes after 5 minutes have elapsed since the compressor operation start, the

abnormality stop occurs. (The timer lamp flashes 2 times.)

2) Abnormality of indoor fan motor: The indoor fan motor revolves at a rate under 300 rpm for 30 seconds or

longer, the RUN lamp will flash.

3) Abnormality of heat exchanger thermistor: RUN lamp will flashing when the input temperature of the heat

exchanger thermistor measures less than –20ºC for more than 15

seconds with the airconditioner “OFF”. (will not flashing during

operation)

4) Abnormality room temperature thermistor: RUN lamp will flashing when the input temperature of the room

temperature thermistor measures less than –20ºC for more than

15 seconds with the airconditioner “OFF”. (will not flashing during

operation)

Note (1) If the above abnormalities happen concurrently, the lamp will flashing in the order of item number 1) through 4) above.

When the compressor begins operating the thermal operation is not effective for 3 minutes, so operation continues as is in the

operation mode. (After 3 minutes has passed the thermal operation is effective.)

However, stopping the compressor via a stop signal or protection control has priority.

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