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54
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'14 • SR-T-157
(o) Outdoor fan motor protection
If the outdoor fan motor has operated at 75 rpm or under for more than 30 seconds, the compressor and fan motor are stopped.
(p) Outdoor fan control at low outdoor temperature
(i) Cooling
1) Operating conditions:
When the outdoor air temperature (TH2) is 22ºC or lower continues for 30 seconds while
the compressor command speed is other than 0 rps.
2) Detail of operation:
After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat
exchanger temperature shall implement the following controls.
a) Outdoor heat exchanger temperature =< 21ºC
After the outdoor fan speed drops (down) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is
lower than 21ºC, gradually reduce the outdoor fan speed by 1 speed. (Lower limit 1st speed)
b) 21ºC < Outdoor heat exchanger temperature =< 38ºC
After the outdoor fan speed maintains at A speed for 20 seconds; if the outdoor heat exchanger temperature is 21ºC~
38ºC, maintain outdoor fan speed.
c) Outdoor heat exchanger tempeature > 38ºC
After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is
higher than 38ºC, gradually increase outdoor fan speed by 1 speed. (Upper limit 3rd speed)
3) Reset conditions:
When either of the following conditions is satisfied
a) The outdoor air temperature (TH2) is 25ºC or higher.
b) The compressor command speed is 0 rps.
Outdoor temperature > 10˚C
Outdoor temperature <= 10˚C
2nd speed
Outdoor fan
1st speed
¡
Value of A
(q) Drain motor (DM) control
(i)
Drain motor (DM) is operated during the cooling or dehumidifying mode operations and simultaneously wity the com-
pressor ON. The DM continues to operate for 5 minutes after the operation stop, anomalous stop, thermostat stop or when
it was switched from the cooling and dehumidifying operations to the fan or heating operation.
Indoor unit operation mode
Stop
(1)
COOL
DRY
FAN
(2)
HEAT
Compressor ON
Control A
Compressor OFF
Control B
Note (1) Inciuding the stop from the cooling, dehumiditying, fan
and heating, and the anomalous stop
(2) Inciuding the “FAN” operation according to the
mismatch of operation modes
1)
Control A
a) If the float switch detects any anomalous draining condition, the unit stops with the anomalous stop and the
drain pump starts. After detecting the anomalous condition, the drain motor comtinues to be ON.
b) It keeps operating while the float switch is detecting the anomalous condition.
2)
Control B
If the float switch detects any anomalous drain condition, the drain motor is turned ON for 5 minutes, and at 10 sec
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onds after the drain motor OFF it checks the float switch. If it is normal, the unit is stopped under the normal mode
or, if there is any anomalous condition, displayed by the flashing of display lights and the drain motor is turned ON.
(The ON condition is maintained during the drain detection.)
(ii) Heating
1) Operating conditions:
When the outdoor air temperature (TH2) is 4ºC or lower continues for 30 seconds while
the compressor command speed is other than 0 rps.
2) Detail of operation:
The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed)
3) Reset conditions:
When either of the following conditions is satisfied
a) The outdoor air temperature (TH2) is 6ºC or higher.
b) The compressor command speed is 0 rps.
