26
Fig. 14
Safety valve
Fig. 15
Bleeding valve
The expansion vessel pressurising valve
is situated on the right from the pump (Fig.
13).
Important:
Make sure that the expansion
vessel capacity is suffi cient for the volume
of water in the heating system (see
installation design documentation).
Safety valve
The system safety valve is situated at
the bottom of the boiler on the left side
of the hydraulic group (Fig. 14). When
the maximum pressure in the system
is exceeded, water or steam can be
discharged through the safety valve,
therefore we recommend that you attach a
hose to the safety valve neck, discharging
the water into the building’s waste water
system.
Important: Under no circumstances may
anyone manipulate with the safety valve
while the boiler is in operation. It is also
forbidden to use the safety valve for
draining water from the boiler or from the
heating system. Problems caused by the
valve being clogged with dirt from the
heating system are not covered by the
boiler’s warranty.
Connecting gas supply
The Lion boilers are designed to be fuelled
by natural gas of nominal pressure in the
gas mains 2 kPa, for which the calorifi c
value is most commonly stated to be
within the range of 9 and 10 kWh/cu.m.
Indoor gas distribution pipes and a gas
meter must be sized adequately, taking
into account also the user’s other gas
appliances.
All gas distribution pipes must be installed
in accordance with STN EN 1775.
Important:
We recommend to connect
the gas supply using a pipe union with the
slip-over nut screwed onto the pipe over a
corresponding sealing ring (see the boiler
delivery).
After completing the gas supply
connection to the boiler, the coupling
must be thoroughly checked for potential
gas leaks.
Toping the boiler water up
The procedure of toping up water in the
boiler is described in the part “Operating
instructions – Service/Maintenance”.
Important:
Make sure that during the
toping-up procedure as well as when the
boiler is running, the automatic vent cap is
loosened (Fig. 15).