Water Heater Frost Protection - S&P CADB/T-HE PRO-REG Series Instruction Manual

13. WATER HEATER FROST PROTECTION

In models with Water Heater, the temperature of the water return is continually supervised by a probe,
in order to prevent it to freeze.
In case water temperature drops below 12°C, the water valve starts to open (if it already wasn't) and
Frost Risk alarm is activated.
If water temperature falls below 7°C, then fans are stopped and the alarm Water temp too low, system
off is activated. Till the temperature is not over 7°C, the unit will not turn on again.
Unit in OFF mode
When the unit is OFF, antifrost protection remains active trying to maintain a constant return water
temperature of 25°C.
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