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Installation
Installation
3.
Description of the Hoval TopGas
3.1
®
The heat exchanger of the Hoval TopGas
®
(30,35,45,
50,60) comprises a corrosion-resistant aluminum
casting, through which the heating water flows in
series-parallel fashion from bottom to top.
The combustion air is extracted by a fan through
openings in the top cladding cover from the boiler
installation room or via an air-flue gas (for room air
independent operating).
The combustion air is mixed with a defined quantity
of combustion gas before the fan by means of a gas-
air compound controller. The homogeneous gas-air
mixture is then taken to the premix bat-wing burner
for low emission combustion via a distributor.
The premix bat-wing burner comprises a high-tem-
perature resistant stainless steel mesh with optimal
protection against overheating damage.
The heat exchanger is designed in such a way that
with correspondingly low system temperatures the flue
gas is cooled below the flue gas dewpoint. Through
the additional utilisation of the latent flue gas heat
(heat output utilisation) the Hoval TopGas
®
(30,35,
45,50,60) operates with very high efficiency.
On leaving the heat exchanger the cooled flue gas is
transferred to the flue gas pipeline system
Diaphragm expansion tank
3.1.1
Depending on the hydraulic situation of the system an
adequately dimensioned diaphragm expansion tank
with an inlet pressure of at least 0.3 bar above the
static pressure must be installed by the customer.
Boiler casing
3.1.2
This is of sheet steel, with a white powder-paint finish,
with easily removable front.
Gas fittings
3.1.3
Honeywell VK4125V gas controller for the automatic
regulation of the gas/combustion air ratio, see chapter
4.3.6.
Automatic gas firing unit
3.1.4
and heating controller
Automatic firing unit BIC 335 (see chapter 2.4 for
short description).
Heating circulation pump
3.1.5
The TopGas
®
(30,35,45,50,60) is delivered without
an installed heating circulation pump. A sufficiently
dimensioned heating circulation pump must be in-
stalled by the customer.
Hot water supply
3.1.6
The Hoval TopGas
®
(30,35,45,50,60) can be combined
with a service water heater (e.g. Hoval CombiVal).
The electrical connections for connecting the storage
tank sensor and filling pump must be established at
the appropriate terminals of the TopGas
®
controller
(see electrical connection diagram).
Scope of supply
3.1.7
Manometer
-
Autom. deaerator in the boiler flow
-
Plastic siphon in the condensate drain line
-
Water pressure deflector as a boil-dry safeguard
-
Flue gas temperature sensor
-
Gas connector piece ¾"
-
Electrical connection cable approx. 1,5 long, with
-
connector plug
Gas pressure deflector
-
Summary of Contents for TopGas 30
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