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SECTION 8: ADJUSTING THE DRAFT OVER FIRE
Understanding the Importance of Draft
Draft in the furnace is created as the hot combustion gases rise up the stack, creating a negative pressure
inside the stack and the furnace. This negative pressure is measured as inches of water column (W.C.)
of draft. A proper draft over fire of -.02 to -.04 w.c. is essential so that all combustion products travel away
from the burner, down the combustion chamber, through the furnace flue tubes and up the stack.
Checking for Correct Draft Over Fire
WARNING: Correct draft over fire is
essential for the proper and safe operation of
your furnace.
Your furnace is equipped with an observation/draft
reading port to check draft over fire. Qualified
service personel with proper equipment must
check/adjust your furnace for proper draft.
Contact your Clean Burn dealer for this service.
1.
Insert the probe of the draft gauge
instrument into the draft reading port in
the observation port as shown in Figure 8A.
NOTE: Follow the directions with the
draft gauge to use your specific type of gauge.
2.
Note the draft over fire reading on the draft
gauge.
ATTENTION: The draft reading should
be in the -.02 to -.04 w.c. range. Poor
draft (i.e. -.01 to +.08) results in back
pressure in the furnace and poor burner
performance. Too much draft over fire
(i.e. greater than -.04) sucks the heat from
the furnace and results in abnormally high
stack temperature.
Operator's Manual: Models Saturn™ 140 & Saturn™ 230
Figure 8A - Checking for Proper
Draft Over Fire
8-1
I88257
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