Weishaupt WTC 45-A, Installation And Operating Instructions Manual

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3 Technical description 3
3.1 Permissible application
The Weishaupt Thermo Condens WTC 45-A/60-A is a
condensing wall mounted heating appliance for sliding
setback operation without lower temperature limit with a
a minimum flow of 400l/h through the heat exchanger.
• For wall mounting in enclosed rooms
(installation outdoors is not permitted)
• For heating DHW heating circuits in sealed systems
to DIN EN 12828.
• For flue gas ducting in chimneys / flue gas ducts or
directly via wall and roof flue gas systems
• For combustion air supply from the room air or with
room air independent systems.
• For gas families Natural gas E/LL and Liquid
Petroleum Gas B/P.
3.2 Function
3.2.1 General notes
Condensate drain
The condensate created by the condensing boiler
technology is fed into the waste water system via a
siphon built into the unit. The ATV data sheet A251
should be observed.
Combustion air
Depending on the type of operation, the combustion air
is supplied either from the room where the unit is
installed (room air dependent operation) or via a
concentric pipe system (room air independent operation).
Flue gas system
Once the cooled flue gas exits the heat exchanger it
flows through a flue gas duct made from Polypropylene
(PP) to the unit exit, from where a number of different
ducting systems from the Weishaupt flue gas / air system
WAL-PP are available.
☞
Observe installation and operating instructions
WAL-PP!
Safety equipment
An internal flue gas temperature limiter (max. 120 °C)
and a safety temperature limiter switch off the unit at
excess temperature.
3.2.2 Important components
Heat exchanger
The heat exchanger is made from corrosion proof
aluminium alloy.
The flow through the WTC is from bottom to top through
three parallel segments
1
–
3
. The water flow is
distributed between the three segments by the return
distributor and is combined again by the supply
distributor once it has circulated the heat exchanger. An
automatic de-aerator is fitted in the supply collector.
The heat exchanger is designed in such a way that the
flue gas is cooled to below the flue gas dewpoint if the
system temperature is adequately low.
It is surrounded by water and has no additional insulation.
Due to the utilisation of the latent flue gas heat the unit
operates with very high efficiency.
Heat exchanger operating mode
Premix burner
The overheat proof radiant burner is made from a highly
stressable metal mesh (FeCr Alloy). Flame monitoring
and the regulation of the gas quantity are carried out by a
SCOT
®
monitoring electrode in conjunction with the fully
electronic compound regulation and the Weishaupt
Condens Manager (WCM).