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Rendamax R3400 Manual

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32 Doc890/3456CV02B
Fig. 21 Distance between air inlet and fl ue gas outlet
The formation of unwanted condensation must be avoided. In the event that during the heating up
period condensation oc curs, the condensate must be able to fl ow back to the unit. Inspection of
the air supply and fl ue pipe must be possible.
The connection, exit position and height in relation to possible obstacles must comply with the
applicable national and local standards and regulations (see Supplement).
5.3.5 The Flue system
5.3.5.1 General
The fl ue pipe connection is at the rear of the appliance and has been designed for direct connec-
tion to a corrosion resisting fl ue pipe.
Condensation forms because of the high boiler effi ciency and the considerable degree of cooling
of the fl ue gasses that takes place against the walls of the fl ue pipe. In order to reduce fl ue gas
condensation as much as possible, the use of a double-walled and insulated fl ue pipe is recom-
mended. Aluminium or stainless steel is strongly recommended. Because a slight overpressure
exists in the fl ue pipe during a cold start-up, fl ue pipes should preferably be constructed from
seamless materi als. When the boiler functions as a high capacity boiler, the high effi ciency can
lead to the formation of condensation in the chimney.
y
The condensate drain must never become blocked!
Direct connection to brick built stacks is not permitted because the combustion effi ciency of the
boiler is › 83 %. The combus tion products at low fl ue gas temperatures will damage the stack.
The following table lists all the fl ue gas data for all types of boiler.
… 29 …


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