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MONTAGE
4.
Installation
4.1
Description of the Hoval TopGas
®
The heat exchanger of the Hoval TopGas
®
(35,45,60) com
-
prises 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 open-
ings in the top cladding cover from the boiler installation
room or via an air-flue gas (for room air independent op
-
erating).
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 emis-
sion combustion via a distributor.
The premix bat-wing burner comprises a high-tempera-
ture 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 addi
-
tional utilisation of the latent flue gas heat (heat output
utilisation) the Hoval TopGas
®
(35,45,60) operates with
very high efficiency.
On leaving the heat exchanger the cooled flue gas is
trans ferred to the flue gas pipeline system.
4.1.1 Diaphragm expansion tank
Depending on the hydraulic situation of the system an ad-
equately dimensioned diaphragm expansion tank with an
inlet pressure of at least 0.3 bar above the static pressure
must be installed by the customer.
4.1.2 Boiler casing
This is of sheet steel, with a white powder-paint finish,
with easily removable front.
4.1.3 Gas fittings
Honeywell VK4125V gas controller for the automatic reg-
ulation of the gas/combustion air ratio, see chapter 5.4.4.
4.1.4 Automatic gas firing unit and heating controller
Automatic firing unit BIC 335 (see chapter 7.4 for short
description).
4.1.5 Heating circulation pump
The TopGas
®
(35,45,60) is delivered without an installed
heating circulation pump. A sufficiently dimensioned heat
-
ing circulation pump must be installed by the customer.
4.1.6 Hot water supply
The Hoval TopGas
®
(35,45,60) can be combined with a
ser vice 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 elec-
trical connection diagram in the boiler).
4.1.7 Scope of supply
• 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 R ¾″
•
Electrical connection cable approx. 1,5 m long,
with con nector plug
•
Gas pressure deflector
Summary of Contents for TopGas 35
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