Aqua Tempo Super II
201709 25
6.6 DC Fan Motor Protection Control
This control protects the DC fan motors from abnormal power supply. DC fan motor protection occurs when the fan
module does not receive any feedback from the fan motor.
When DC fan motor protection control occurs the system displays the PU error code and the unit stops running. When PU
protection occurs 2 times in 120 minutes, the FF error is displayed. When an FF error occurs, a manual system restart is
required before the system can resume operation.
6.7 Water Side Heat Exchanger Anti-freeze Protection Control
This control protects the water side heat exchanger from ice formation. The water side heat exchanger electric heater is
controlled according to water side heat exchanger anti-freezing temperature (Taf), water inlet temperature (Twi), water
outlet temperature (Two) and total water outlet temperature (Tw).
When water side heat exchanger anti-freeze protection occurs the system displays error code Pb and all the units stop
running.
Figure 3-6.7: Anti-freeze protection control in normal cooling mode
Note:
1. Taf include Taf1 and Taf2.
In standby or normal cooling mode, either water side heat exchanger anti-freezing temperature (Taf), water inlet
temperature (Twi), water outlet temperature (Two) or total water outlet temperature (Tw) is below 4°C, the unit will run
heating mode , until the total water outlet temperature is above 15°C, and restart the normal operation.
Figure 3-6.8: Anti-freeze protection control in low water outlet cooling mode
Note:
1. Taf include Taf1 and Taf2.
In low water outlet cooling mode, either water side heat exchanger anti-freezing temperature (Taf), water inlet
temperature (Twi), water outlet temperature (Two) or total water outlet temperature (Tw) is below 0°C, the unit will run
heating mode , until the total water outlet temperature is above 15°C, and restart the normal operation.
Min(Tw/Two/Twi/Taf
1
) ≤ 4°C
Anti-freeze protection, error code Pb is displayed
Min(Tw/Two/Twi/Taf
1
) ≤ 0°C
Anti-freeze protection, error code Pb is displayed
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