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1.2 Dispositifs de sûreté
technique
Bloc gaz
Le chauffe-eau à accumulation est
pourvu d’un bloc gaz comprenant un
dispositif de sûreté thermoélectrique de
la veilleuse, un régulateur de pression
de la veilleuse, un régulateur de
pression du brûleur, un contrôle
thermique (réglable de 40°C à 81°C) et
un thermostat de sûreté (90°C). D’une
simple commande au maniement sûr, on
ouvre ou coupe l’arrivée du gaz au
brûleur principal.
Le bloc gaz convient pour les trois
premières familles de gaz. La pression
maximale à l’entrée est de 50 mbar.
Dispositif de sécurité anti-
refoulement
L’appareil est pourvu d’une
protection de l’évacuation des gaz de
combustion. Le fonctionnement de ce
dispositif est basé sur le principe de la
Sécurité Refoulement Thermique.
(S.R.T.), voir fig. 2.
Cette S.R.T. est identifiable à la
spirale cuivrée fixée au bord inférieur
du coupe-tirage. La spirale est
raccordée à un thermostat au moyen
d’une conduite capillaire. Le câblage du
thermostat doit être raccordé au circuit
du thermocouple.
1. Thermostat anti-
refouleur
2. Contrôle de
température
3. Thermocouple avec
interrupteur intégré
4. Thermocouple
5. Bloc gaz
6. Bouton ‘RESET’
7. Veilleuse
8. Bouton du contrôle
thermique
Figure 2 - Bloc gaz avec anti-refouleur
7


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