FIGURE 122
FLUE GAS SAMPLING
•
FLUE GAS TEMPERATURE
RANGE
The usual flue gas temperature
range is 100° - 125°.
Make a hole in
the exhaust pipe using the same
procedure as when measuring the
CO and CO2. Use a thermometer to
measure the flue gas temperature.
Possible causes for high flue gas
temperature:
A. Unit overtired with too much
gas pressure,
J
8. Restricted air flow.
C. Restricted heat exchanger(s).
D. Improper (oversized) burner
orifices.
Possible causes for low flue gas
temperature:
A. Too much air from the indoor
blower,
8. Underfiring the unit with too
little gas pressure.
C. Improper (undersized)
burner orifices.
FIGURE 123
FLUE GAS TEMPERATURE MEASUREMENT
99
To Next Page
Loading...