Thermona Therm 17 KD, Инструкция по установке и эксплуатации

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1. USE
Wall-mounted condensing boilers THERM 17 KD are modern gas appliances suitable for heating of
buildings of a maximum heat loss of 17 kW and with forced venting (they do not require a flue). They are
constructed as appliances utilizing water vapour condensation in the combustion process and they are characterized
by a high performance and minimal atmospheric emissions. This means that their operation is economical and
environmentally-friendly. The boiler output is fluently regulated within the range of 20 – 100 % and it adapts
automatically to the building requirements.
Top-ranking components from leading world manufacturers employed in their production assure high
technical standard of the boiler.
Individual versions of the THERM 17 KD boilers have the following structural design:
THERM 17 KD
– boiler modification used only for heating systems (control circuits enabling external
connection of an intercepting valve for hot service water (HSW) tank heating are preserved).
THERM 17 KDZ
– for heating systems and for external HSW tanks equipped with output modulation in both
modes.
THERM 17 KDZ 5 – for heating systems and for integrated stainless 55l HSW tanks with output modulation in
both modes.
All boilers are fitted with a 7l expansion vessel. The 17 KDZ 5 version is additionally fitted with a 2l expansion
vessel in the HSW circuit.
Warning: In order to ensure correct function of the boiler, minimum water pressure in the heating system must
not drop below 0.8 bar (measured in the cold state). If a boiler is connected to a system with an open expansion
vessel, it must be placed at least 8 m above the boiler.
Warning: In case the ambient air temperature drops below the freezing point in boiler which is turned off, the
HSW tank of the 17 KDZ boiler version must be discharged!
2. GENERAL CHARACTERISTICS OF THERM 17 KD SERIES BOILERS
THERM 17 KD gas boiler is composed of a carry frame to which all operational components of the boiler
are attached.
Giannoni compact condensing body which conjugates the combustion chamber and burner with the two-
chamber stainless heat exchanger is located in the upper part of the boiler. The condensing body cover comprises
an external thermoplastic envelope reinforced with a stainless inner wall which considerably reduces penetration of
heat into the surrounding environment.
Heat-exchanging surfaces of the heat exchanger are constituted by
round pipe walls which need to be protected from clogging by impurities from the heating system. The
heating system must be therefore fitted with a filter at the recuperative water inlet into the boiler. The collector
located at the heating water outlet from the body is fitted with a bleeding valve. The removable front wall of the
body is fitted with two electrodes (igniter and ionization electrodes), flash pipe and worked piping for the gas and
air mixture feed.
A suitable ratio of gas and air in the mixture and their intermixing is ensured by a mixer together with a
special gas fitting. The fitting is composed of a gas pressure regulator, two solenoid blocking valves and a ratio
control of the outlet gas quantity which can be partly set manually as well. The ratio control concurrence can be set
only with a special equipment. The entire system operates as follows: The amount of the added gas is directly
proportionate to the amount of air flowing through the mixer supplied by the ventilator. It can be thus stated that
the boiler output depends on the amount of flowing air for combustion.
Ventilator speed can be therefore continuously electronically controlled over a wide range which results in a
high output range of the boiler. Air is fed into the boiler through the worked piping from the connecting set.
The condensed water drains from the condensing body and the venting and air feed pipes are led into a
syphon from which the condensate is conducted outside the boiler.