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(16) Compressor overheat protection
The detection temperature of the discharge pipe sensor (Tho-D) is used to prevent oil deterioration and damage to the motor wire
due to overheating of the compressor.
(a) If Tho-D becomes > = 110 °C, the compressor is stopped. After the stop mode has been activated, the compressor will be
restarted when Tho-D becomes < 80 °C. However, if it is restarted repeatedly within an interval of 1 hour, it will not start on
the 3 times.
(b) When 90 °C < = Tho-D < 110 °C, the following decision speed controls are performed.
Decision speed
Inverter
Notes (1) If the temperature of the discharge pipe is 90 °C or more and less than 110 °C, the decision speed is reduced by 4 rps.
(2) After 20 seconds, if the temperature of the discharge pipe has decreased, it is lowered 2 rps. If the temperature has risen or is the
(3) If the temperature of the discharge pipe is 80 °C or more and less than 90 °C, the decision speed is maintained. If operation is
(4)
(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 decision speed drops to 4 rps. After 20 seconds, the decision 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
40 ~ 48 type
60 ~ 80 type
3 80°C = < Power transistor sensor temperature < 90°C
Maintain the decision 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 decision speed is reached.
(18) Serial transmission abnormality protection
If the compressor is operating with a decision speed other than 0 rps and a serial signal cannot be received from all indoor controls
with outdoor controls having serial signals other than "stop - 0 rps" 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.
6 minutes of more has passed
6 minutes of more has passed
6 minutes of more has passed
80
Discharge pipe temperature (°C)
same, it is lowered another 4 rps.
maintained at the same speed for 6 minutes or more or if the temperature is 80 °C or less, control is returned to normal operation.
Lower limit speed
40 ~ 48 type
35 rps
60 ~ 80 type
20 rps
Lower limit speed
35 rps
20 rps
(3)
(3)
(3)
Lower limit
90
reduce by 4rps
reduce by 2rps
63
-
-
(1)
4 rps
4 rps or 2 rps
(2)
(2)
(4)
4 rps or 2 rps
0 rps
110
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