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(17) Power transistor overheat protection
(a) Purpose: In order to prevent the power transistor overheating during operation, faulty controller operations, deterioration,
damage and so on occurs.
(b) Detail of operation:
1 Power transistor sensor temperature = > 110°C
The compressor is stopped immediately. When the power transistor sensor temperature is less than 80°C, restart.
2 90°C = < Power transistor sensor temperature < 110°C
The outdoor unit speed drops to 4 rps. After 20 seconds, the outdoor unit speed performs the following controls, according
to the power thansistor sensor temperature.
If the previous sensor temperature < = current sensor temperature
If the previous sensor temperature > current sensor temperature
Lower limit speed
3 80°C = < Power transistor sensor temperature < 90°C
Maintain the outdoor unit speed. When the rotation speed is the same for 6 minutes, or when the power transistor sensor
temperature is less than 80°C. The speed is raised by 2rps and kept at that speed for 1 minute. This process is repeated
until the inverter command speed is reached.
(18) Compressor overheat protection
(a) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor
overheat.
(b) Detail of operation
1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
(Example) Fuzzy
Notes (1)
When the discharge pipe temperature is in the range of 100 to 110°C, the speed is reduced by 4 rps.
(2)
When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.
(3)
If the discharge pipe temperature is still 90 °C or greater but less than 100 °C even when the inverter command speed is maintained for 3 minutes
when the temperature is 90 °C or greater but less than 100 °C, the speed is raised by 1 rps and kept at that speed for 3 minutes. This process is
repeated until the calculated speed is reached.
2) If the temperature of 110°C is detected by the sensor on the discharge pipe, then the compressor will stop immediately.
When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1 hour but
there is no start at the third time.
(19) Serial signal transmission error protection
(a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals.
(b) Detail of operation: If the compressor is operating and a serial signal cannot be received from the indoor control with
Cooling
20rps
After lapse of 3 min. or over
After lapse of 3 min. or over
After lapse of 3 min. or over
90
Discharge pipe temperature (˚C)
outdoor control having serial signals continuously for 1 minute and 55 seconds, the compressor is
stopped.
After the compressor has been stopped, it will be restarted after the compressor start delay if a serial
signal can be received again from the indoor control.
(RUN light: ON, TIMER light: 6 times flash)
-
reduce by 4rps
reduce by 2rps
Heating
20rps
(3)
(3)
Lower limit
(3)
speed 20rps
100
29
-
(1)
4 rps
4 rps
0 rps
110
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