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the safety valve. The drain installed below the safety valve outlet must be
piped down vertically and located in the environment that is free from the
onset of freezing conditions. In case the existing plumbing does not
enable you to pipe the dripping water from the return safety valve into the
drain, you can avoid the dripping by installing a 3-litre expansion tank on
the inlet water pipe of the boiler. You should ensure that the return safety
valve is functioning properly by checking it on a regular basis i.e. every 14
days. To check the valve, you should open the outlet of the return safety
valve by turning the. The valve is operating properly if the water comes
out of the nozzle when the outlet is open.
F
C
Fig-3 Hydraulic installation
Legend:
1- Return safety valve 6- Checking fitting
2- Checking valve connection
7- Funnel with outlet connection
3- Non-return valve
4- Pressure reduction valve F - Cold water
5- Closing valve C - Hot water
Putting into service:
Before connect hydraulically the water heater to water network
lets the water flow some to time to remove all dirty which could damage
the safety valve and block the diffuser.
To fill the water heater properly leave a hot water tap open to
drain the water heater tank and only close it when water comes out
fluently. When water become hot after the necessary time tight again all
connections to assure a correct water sealing.
If the water network pressure is higher than the nominal pressure
of the water heater, it is compulsory to install special valve to reduce the
water inlet pressure between 2 and 3 bar.
