Operating Principle - DeDietrich GTU C 330 Installation And Service Manual

3.4 Operating principle

Boiler operation is managed by the control panel according to the
outside temperature and the heating request.
When the burner is operating, the combustion products pass through
the boiler where an initial heat transfer is made to the heating water.
The combusted gases then pass through the condesner where a
second heat transfer is made. The heat recycled from the condenser
by the exchanger is reinjected into the heating circuit.
The condenser is protected by 2 thermostats:
- The manual reset safety thermostat, which monitors the
temperature of the combustion products at the condenser outlet.
This thermostat cuts the mains supply to the burner if the
temperature reaches 120°C.
- The automatic reset limiter thermostat, which monitors the heating
water temperature in the condenser. This thermostat cuts the
mains supply to the burner if the temperature reaches 80°C.
The combustion products are discharged through the flue gas nozzle
on the condenser.
The condensates are collected in the bottom of the condenser
whence they are discharged to a siphon and then to a neutralisation
station. The siphon, which has a large water storage capacity,
ensures the tightness of the combustion products discharge pipe.
The condensates in oil-fired condensing boilers are acidic. We
recommend the installation of a condensates neutralisation system to
protect the pipes and the environment.
The neutralisation station must include an adapted filter with granules
and activated carbon. The neutralisation station that we provide
includes this kind of filter (Package MD225).
The neutralised condensates can then be discharged into the waste
water network.
07/04/2009 - 300016152-001-C GTU C 330
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