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WERKING
6 720 675 123 (T30.35123.04) (2008/12)
20
7 WERKING
7.1 Concept van de warmtewisselaars
De cv-ketel is uitgerust met twee warmtewisselaars die
een hoog prestatieniveau mogelijk maken:
- Een primaire warmtewisselaar in aluminium-silicium, uit
één stuk, zonder las- of nippelverbindingen. Dus zon-
der risico op lekkage.
- Een secundaire warmtewisselaar in geëmailleerd staal,
die de primaire warmtewisselaar omsluit. Hij koelt de
branderkamer, vermijdt warmteverliezen door straling
langs de zijkanten van de ketel en koelt tevens de roo-
kgassen.
De combinatie van beide warmtewisselaars maakt een
rookgastemperatuur van minder dan 130°C mogelijk.
7.2 Werkingsschema
Fig. 7
t0 tot t6 normale werking
t4 tot t9 geen ontstekingsvlam
Tw wachttijd
Ts vergrendelingstijd bij gebrek aan een ontstekingsvlam
(maximum 7 seconden)
Tpr voorontstekingstijd
Tpo na-ontstekingstijd
De twee branders van het toestel EHLE 78 werken simul-
taan.
De twee schakelkasten worden vanuit één centraal bedie-
ningspaneel gestuurd.
thermostaat
ontsteking
Spoel 1
Spoel 2
vlam
controlelampje
Tw Tpr Tpo
Tw
Tpr
Ts
20


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