CONTROL
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elapsed.
4.7.7 DC fan motor protection control
This control protects the DC fan motor from strong winds and abnormal power supply.
DC fan motor protection occurs when any one of the following three sets of conditions are met:
A The outdoor ambient temperature is at or above 4°C and actual fan speed diers from set fan speed by 200
rpm or more for more than 3 minutes.
B The outdoor ambient temperature is below 4°C and actual fan speed diers from set fan speed by 300 rpm
or more for more than 3 minutes.
C Actual fan speed is less than 150 rpm for more than 20 seconds.
When DC fan motor protection control occurs, the system displays the H6 error code and the unit shuts down. After 3
minutes, the unit restarts automatically.
When H6 protection occurs 10 times in 120 minutes, the HH error is displayed. When an HH error occurs, a manual
system restart is required before the system can resume operation.
4.7.8 Water side exchanger antifreeze protection control
In cooling mode, if:
• either the inlet water temperature
• or the outlet water temperature
• or the auxiliary heat source outlet water temperature
is below 4°C, the antifreeze protection activates.
In heating/DHW mode, if:
• either the ambient temperature is below 3°C and the inlet water temperature or the auxiliary heat source
outlet water temperature is below 5°C;
• or the outlet water temperature is below 2°C
The antifreeze protection activates.
When water side heat exchanger antifreeze protection occurs, the system displays error code Pb and the unit shuts
down.
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