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'14•SRK-T-153
(11) Protective control function
(a) Frost prevention for indoor heat exchanger
(During cooling or dehumidifying)
(i) Operating conditions
1)
Indoor heat exchanger temperature (Th2) is lower than 2.5ºC.
2)
3 minutes elapsed after the start of operation.
(ii) Detail of frost prevention operation
Compressor
OFF
Indoor fan
Protects the fan tap just before frost prevention control.
Outdoor fan
Depending on the stop mode
(iii) Reset condition:
Indoor heat exchanger temperature (Th2) is higher than 8ºC.
(b) Indoor fan motor protection
When the airconditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300
rpm or under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.
TIMER light illuminates simultaneously and the RUN light flashing 6-time at each 8-second.
(c) 3 minutes 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.
(d) Abnormality of outdoor unit
When the indoor heat exchanger temperature does not fall to 25°C or below for 40 minutes after 5 minutes have elap-
sed since the compressor operation start, the abnormality stop occurs. (RUN light : ON, TIMER light : 2-time flash)
(e) Sensor disconnection (room temperature, indoor heat exchanger)
(i) Room temperature sensor
If the temperature detected by the room temperature sensor is –20ºC or lower continuously for 15 seconds or longer
while operation is stopped, an error indication is displayed. (RUN light: 2-time flash, TIMER light: ON)
(ii) Indoor heat exchanger temperature sensor
If the temperature detected by the indoor heat exchanger temperature sensor is –20ºC or lower continuously for 15
seconds or longer while operation is stopped, an error indication is displayed.
(RUN light : 1-time flash, TIMER light : ON)
Summary of Contents for SRK10CNS
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Page 71: ... 70 14 SRK T 153 4 Troubleshooting procedure If the air conditioner runs NO YES 71 ...
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