the stove to be disconnected from the water system without having to empty either the
stove boiler or the actual system (BALL VALVES) (3)
the appliance to be disconnected quickly without subjecting the connecting pipes to
stress (3-PIECE PIPE UNION) (1)
The safety valve must be connected using a hose without shut-off devices, which could
obstruct the free flow of fluid under pressure.Check that any kinks in the hoses will not allow
air locks or pockets to form or obstruct the free flow of water.
NOTICE
Before connecting the appliance, flush the heating system through to eliminate any residues (oil,
swarf, drops of weld material, hemp, rust) inside the pipework, which could otherwise damage
the appliance or cause malfunction. Insulate the connecting pipework adequately to prevent
heat loss and the formation of condensation. Under no circumstances light the appliance unless
the water circuit is completely filled with water.
The expansion tank installed inside the appliance is only sufficient to compensate the water in
the appliance and up to a MAX. of 20 lt of water in the system; the part of the system
corresponding to this quantity must be near the appliance and run relatively straight.
Installation of a suitably sized additional expansion tank is however recommended to
compensate for the quantity of water present in the heating system. The correct size of the
expansion tank must be calculated by a qualified heating plumber. As an example, the design
calculations for an expansion tank are given below, taking into consideration the following:
cold temperature of fluid 15°C
maximum working temperature of fluid 90°C
difference in level between additional expansion tank and relief valve (3 bar) equal to
or less than 1.5 m
pre-filling pressure of the expansion tank 2 bar.
The capacity of the closed expansion tank required by a heating system with such characteristics
can be calculated with the following formula:
V
v
= V
o
x 0.16
V
v
= volume of the expansion tank in l
V
o
= water content of the system in l