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Installation
Boiler installation room
3.2
Hoval heat output boilers series TopGas
®
(30,35,45,
50,60) can be combined with flue gas pipelines
which
a) extract the combustion air from the boiler instal-
lation room (room air dependent gas firing loca-
tion)
b) extract the combustion air from the outside via a
closed system (room air independent gas firing)
The boiler installation rooms must satisfy the locally
applicable regulations (firing regulation, fire service
regulations), in particular the requirements accord-
ing to:
- SVGW- guidelines
- DVGW - TRGI 86-96
must to be noted an complied with.
With room air dependent operation, care is to be taken
that the combustion air is free from impurities (dust,
building materials...) and aggressive substances
(halogens such as chlorides, fluorides etc.). The gas
boiler should not be connected to the gas supply
or put into operation whilst building work is still in
progress.
Installing the boiler
3.3
The Hoval TopGas
®
(30,35,45,50,60) is delivered as
follows.
Carton: Boiler; cladding components, installation and
operating instructions.
The boiler must not be placed on its connector
elements.
Mount the boiler to the wall at the planned location.
Distance from the side: at least 5 cm; distance from the
ceiling: the necessary distances are to be observed
according to the type and dimensions of the pipelines
for combustion air and flue gas.
Please note dimensions and instructions in the
drawings in chapter 2.2.
Hydraulic connection
3.4
The Hoval TopGas
®
(30,35,45,50,60) is suitable
for flexible operation (room temperature control or
weather-supported boiler and heating control) tem-
perature limiting.
For suitable hydraulic connections, please note the
instructions in the Hoval project planning documen-
tation.
When modernising an old heating system with
an open expansion tank, this is to be converted
to a „closed“ heating system with a diaphragm
expansion tank and safety valve.
Protection planning guidelines for the hy-
3.4.1
draulic connection
The installation of a sludge collector in the boiler
•
return is recommended (ensure correct dimension-
ing).
An adequately dimensioned expansion tank must
•
be provided.
The minimum pre-pressure in the expansion tank
•
must be 1,2 bar and the working pressure in the
heating boiler must be 1,5 bar.
The pump is to be connected in the boiler return
•
and the expansion tank in the suction side of the
pump.
If the system pressure cannot to be reached (e.g.
•
roof central heating plants), the expansion tank
must be installed in the flow line. (Note: starting
from 70°C an additional connecting tank is neces-
sary).
Plants with
•
-
continuous
oxygen intake (e.g. underfloor heat-
ing systems without diffusion proof plastic pip-
ing) or
-
intermittent
oxygen intake (e.g. where frequent
refilling is necessary)
must be equipped with separate circuits.
We also recommend the conclusion of a main-
tenance contract!
Boil-dry safeguard
3.4.2
To safeguard the boiler against low water levels or
water deficiency, a water pressure deflector is installed
as standard in the flow distributor (AMP connector at
positions 1 and 3). If water pressure is lower than 1 bar
power disconnection takes place (indication „P27“).
Please check the system pressure and top up with
water as required.
Gravity brake
3.4.3
It is recommended to install a gravity brake, to avoid
heat losses due to gravity circulation (particularly
important when changing existing, open installations).
The gravity brake is necessary for summer operation
with indirectly heated storage water heater.
Minimum flow rate
3.4.4
During the burner operation a circulation pump must
always be in operation too. The minimum flow rate
indicated in the technical data must always be pro-
vided.
