A
B
C
D
GR30
472
275
173
-
GRU50
574
365
185
145
GRU80
779
565
190
345
GRU100
939
715
200
495
GRU150
1309
1065
220
845
GRU200
1518
1050
444
800
installation dimensions of the water heater in mm
3.- CONNECTION TO THE WATER SUPPLY
The water heater connections for the in-flowing and out-flowing water are colour-coded. The connection for the
supply of cold water is coloured blue, while the hot water outlet is coloured red. The water heater may be
connected to a closed-circuit pressure system which enables several points of use. For safety reasons the supply
pipe must be fitted with a return safety valve or alternatively, a valve of the safety class that prevents the pressure
in the tank from exceeding the nominal pressure by more than 0.1 MPa. The heating of water in the heater causes
the pressure in the tank to increase to the level set by the safety valve. As the water cannot return to the water
supply system, this can result in the dripping from the outlet of the safety valve. The drip can be piped to the drain
by installing a catching unit just below 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
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 H - Cold water
5- Closing valve T - Hot water