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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.
(i) Operating condition: when 52C is kept ON for 30 min. after the unit starts operation.
(ii) Operation content: forces the indoor fan to change from Speed 1 to Speed 2.
(iii) 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
2)
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 sensor (heat exchanger, room
temperature, ) it will be indicated by flashing lights.
(i) 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 light flashes 2 times.)
(ii) Abnormality of indoor fan motor: The indoor fan motor revolves at a rate under 300 rpm for 30 seconds or
longer, the RUN light will flash.
(iii) Abnormality of heat exchanger sensor: RUN light will flashing when the input temperature of the heat
exchanger sensor measures less than –20ºC for more than 15 seconds
with the air conditioner “OFF”. (will not flashing during operation)
(iv) Abnormality room temperature sensor: RUN light will flashing when the input temperature of the room tem-
perature sensor measures less than –20ºC for more than 15 seconds
with the air conditioner “OFF”. (will not flashing during operation)
Note (1) If the above abnormalities happen concurrently, the light will flashing in the order of item number (i) through (iv) above.
(c) Three-minute forced operation
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.
2.5 8
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