Flue Gas Temperature; Combustion Chamber Pressure; Loss Of Heat From The Flue - Riello PRESS GBW BIO Installation, Use And Maintenance Instructions

7.6

Flue gas temperature

This temperature varies in relation to the delivery generated: the
lower the delivery, the lower the temperature and the higher the
fuel saving.
7.7

Combustion chamber pressure

This must correspond to the setting indicated by the boiler man-
ufacturer.
Chamber pressure is lowered with reduced burner delivery and
higher CO levels.
2
7.8

Loss of heat from the flue

Heat losses from the flue gas stack Qs are determined by the for-
mula given on page 36 or Diagram (Fig. 30).
Qs
17
16
15
14
13
12
11
10
130 150 200
T2 - T1 = 200 CC
T2 - T1 = Flue gas temperature - Ambient temperature
20033097
Start-up, calibration and operation of the burner
CO
D347
300
250
T2 - T1
= 13% Qs = 9%
Fig. 30
Bear in mind that excessive temperature reduction, however,
gives rise to the formation of condensate.
If the combustion chamber pressure is significantly higher than
expected and the burner's delivery is correct, make sure that the
boiler is not dirty, that the flue gas duct is not obstructed, and that
the flue gas stack has been correctly sized.
10
11
12
13
14
30 GB