5 Start-up
5.1 Filling the system with drinking water
When using optional boiler blocks (PE1 Pellet Unit), the system must be filled with
drinking water before the first start.
NOTICE
Damage to the electric heating element as a result of incorrect start-up
The electric heating element can be destroyed if installed (electrically isolated) in
a system which is not completely filled before start-up
Therefore:
❒ Only start up the system once it is completely filled
❒ Ensure that all necessary discharge taps are fitted and turned off
❒ Open at least one of the valves in the drinking water supply system to ensure that
it is vented while it is being filled
❒ Fill the domestic water tank with cold drinking water
❒ Check that all connections on the drinking water side are tight
❒ Check the safety valve on the cold water supply line is in good working order
➥ the safety valve must trip at max. 6 bar
NOTICE
Damage to the system caused by excess pressure
The system will suffer damage if the pressure in the cold water supply line
exceeds 6 bar
Therefore:
❒ Install a safety valve in the supply line to the domestic water tank
➥ We also recommend installing an additional pressure relief valve
❒ Bleed all the drinking water supply valves connected to the heating system in
order until water starts to come out
➥ This ensures there is no air in the drinking water pipe system
5
Start-up
Filling the system with drinking water
66
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com
