DeDietrich EASYLIFE Alezio G AWHP 4.5MR–EMC 24/28 MI HYBRIDE User Manual page 31

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If the water temperature is lower than 5°C, the circulating pump starts
up.
If the water temperature is lower than 3°C, the back-up starts up.
If the water temperature is higher than 10°C, the back-up shuts down
and the circulating pump continues to run for a short time.
The radiator valves in rooms where there is a risk of frost must be fully
open.
5 Operation
31