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54 Doc430/2789CV01H
Fig. 36 Meten branderdruk
Meet de gasdruk voor de gasklep. Deze dient minimaal 20 mbar te zijn bij vollast (17 mbar bij H-
gas). Bij meerdere units per ketelhuis moet deze druk gemeten worden met alle units in vollast.
Controleer het waterzijdig temperatuurverschil (∆T) tussen de aanvoer en retour van de unit. De
T dient bij vollast tussen 15 en 25 K te liggen.
Controleer de unit op minimumlast
Regel de unit terug naar minimumlast. Bij minimumlast moeten de volgende instellingen worden
gecontro leerd en eventueel worden gecorrigeerd m.b.v. de N-instelschroef op de gasklep.
Richtwaarde minimumlast
Aardgas
Richtwaarde CO
2
R2700-R2709 8,8 - 9,2 %
R2800-R2809, R2900-R2909 8,5 - 9,5 %
Richtwaarde CO 30 ppm
Propaan
Richtwaarde CO
2
10,8 - 11,2 %
Richtwaarde CO 30 ppm
Instelling luchtdrukschakelaar 0,4 ± 0,05 mbar
Branderdruk = ventilatordruk - druk boven brander
P(vent)-P(bb) 0,8 ± 0,1 mbar
Controleer de functie van de ∆p
min
drukschakelaar door een weerstandplaat (bijvoorbeeld een
stuk stevig karton) voorzich-tig voor de aanzuigopening van de ventilator te plaatsen en deze ope-
ning met de plaat dicht te schuiven tot de ketel uit schakelt.
60


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