20
21
Boiler fi lling and draining
Water fi lling into / draining from the heating
system and the related steps (purging,
setting the expansion vessel) are not
covered by the warranty.
Small quantities of water can be refi lled into
the boiler by the refi lling valve.
The drain valve is designed to reduce water
pressure in the boiler before repairs. Only
partial discharge of water from the boiler
can be achieved via the drain valve.
Filling/draining valves should be installed at
suitable points of the system for complete
discharge of water from the boiler or the
entire heating system.
Basic conditions and procedure of fi lling
and draining are described in User
instructions. In additional must be open the
little cap on deaerating valve (on pump),
checked pressure in expansion vessel and
deaerated whole heating system.
Safety valve
On the hydraulic set at the boiler’s bottom
is situated safety valve (see fi g. 13), The
safety valve outlet may release hot water
or steam (if the safety pressure limit is ex-
ceed ed).
Gas connection
The 24 BTV/BOV - G20 model is designed
for natural gas, with 2.0 kPa rated pressure
in the network and the calorifi c value of 9
to 10 kWh/m
3
. The internal gas piping and
the gas meter must be dimensioned for
all gas appliances of the respective user.
The boiler’s connection branch’s rated
inner diameter should be at least DN
1/2", but one degree higher (DN 3/4") is
recommended.
The 24 BTV/BOV - G30 model is designed
for LPG, whose calorifi c value is between
12.3 and 13.0 kWh per kg. Operation using
portable cylinders would be problematic,
due to both suffi cient volume and han dling
of the cylinders; hence a prerequisite for
the operation is installation of an LPG tank
near the heated premises and fi lling of the
tank by an organisation authorised for such
activities.
Suffi cient supply of LPG from the tank to
the boiler (and other gas appliances, if any)
is part of the design and delivery of the
LPG tank . For LPG boilers, a pressure-
control (reduction) valve should provide the
pressure of exactly 3.7 kPa (37 mbar).
Gas piping in buildings must fulfi ll the valid
requirements.
Note: for connecting of gas valve must
be always used union nut and gasket
directly placed on gas valve !!!.
Drain valve
Safety valve
fi g. 12
fi g. 13
Boiler template
fi g. 14
