-
63
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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 decision speed drops to 4 rps. After 20 seconds, the decision speed performs the following controls, according to the
power thansistor sensor temperature.
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.
(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.
Discharge pipe temperature (°C)
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
same, it is lowered another 4 rps.
(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
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.
(4)
6 minutes of more has passed
(3)
6 minutes of more has passed
(3)
6 minutes of more has passed
(3)
Lower limit
(4)
4 rps
(1)
1109080
4 rps or 2 rps
(2)
4 rps or 2 rps
(2)
0 rps
Decision speed
Inverter
(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.
If the previous sensor temperature
<
=
current sensor temperature reduce by 4rps
If the previous sensor temperature > current sensor temperature reduce by 2rps
Lower limit speed
40 ~ 48 type 35 rps
60 ~ 80 type 20 rps
Lower limit speed
40 ~ 48 type 35 rps
60 ~ 80 type 20 rps
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