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TECHnICaL InFORMaTIOn
2.
Technical information
2.1
Description of the Hoval TopGas
®
classic
The heat exchanger of the Hoval TopGas
®
classic com-
prises a corrosion-resistant aluminum casting, through
which the heating water flows in series-parallel fashion
from bottom to top. A fan draws in combustion air through
openings in the top casing cover from the installation
room or via an air-flue gas system (for room air independ
-
ent operation).
A predefined quantity of fuel gas is mixed with the com-
bus tion air in front of the fan via a combined gas and air
con trol. The homogeneous fuel gas/air mixture is then
fed to the pre-mix surface burner via a distributor for low-
emis sion combustion.
The pre-mix surface burner is made from high-tempera-
ture stainless steel mesh which is optimally protected
against damage through overheating.
The design of the heat exchanger is such that the flue gas
is cooled to below the flue gas dew point at correspond
-
ingly low system temperatures. As a result of additional
exploitation of the latent flue gas heat (calorific value uti
-
lisation), the Hoval TopGas
®
classic ope rates with very
high levels of efficiency. After leaving the heat exchanger,
the cooled flue gas is fed to the flue gas system.
2.1.1 Diaphragm expansion tank
Depending on hydraulic conditions, a sufficiently dimen
-
sioned diaphragm expansion tank with a pre-pressure at
least 0,3 bar higher than the hydrostatic pressure on-site
must be installed.
2.1.2 Boiler casing
In sheet steel, white powder-coated, front sections easily
removable.
2.1.3 Gas valve
Gas controlled system Honeywell V VK4615 for
au tomatic regulation of the gas/combustion air ratio, see
2.1.4 Gas automatic function device and heating
regulator
Automatic function device BIC 335 (for brief description,
2.1.5 Heating circulation pump
The Hoval TopGas
®
classic is delivered with out an in-
stalled heating circulation pump. A sufficiently dimen
-
sioned heating circulation pump must be in stal led on site.
2.1.6 Hot water supply
The Hoval TopGas
®
classic can be combined with a DHW
calorifier (e.g. Hoval CombiVal).
The calorifier sensors and the loading pump must be
connec ted at the corresponding terminals of the Hoval
TopGas
®
classic controller (see electrical connection dia-
gram in the boi ler).
2.1.7 Scope of delivery
- Pressure gauge
-
Autom. air vent in the boiler flow
- Plastic siphon in condensate drain
- Water pressure switch as protection against water
short age
- Flue gas temperature sensor
-
Gas connection R ¾″
- Electrical connecting cable, length approx. 1.5 m, with plug
- Gas pressure monitor
Summary of Contents for TopGas classic 100
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