Adjusting The Barometric Damper; Solving Draft Over Fire Problems - Saturn 125 Operator's Manual

Adjusting the Barometric Damper

NOTE: If the draft over fire is not in the -.02 to -.04 w.c. range, it is necessary to adjust the barometric
damper.
1. Before starting the burner, turn the weight
on the flapper COUNTERCLOCKWISE
until the flapper remains closed. This will
provide maximum draft for the furnace.
2. Follow the directions in Section 6 to start
and adjust the burner.
3. With the burner running, check the draft
over fire with a draft gauge.
4. As shown in Figure 8B, adjust the weight
on the flapper to obtain a consistent
-.02 w.c. draft over fire. Turn the weight
COUNTERCLOCKWISE to increase draft
(i.e. draft increases as the flapper closes).
Turn the weight CLOCKWISE to decrease
draft (i.e. draft decreases as the flapper
opens).
5. Tighten the locking nut to securely hold
the weight in position.

Solving Draft Over Fire Problems

WARNING! If you cannot achieve proper draft over fire, do not operate your furnace!
Contact your Clean Burn dealer for assistance.
ATTENTION: Backdraft must be resolved or your furnace will not operate correctly!
Under backdraft conditions, draft over fire readings will show positive pressure in the combustion
chamber. Backdraft means that oil spray, combustion products, and heat are blown back against the
burner. Backdraft results in oil-fouled retention heads and electrodes. Severe backdraft will force heat
back against the burner and result in heat damage to the cad cell and transformer.
Backdraft is caused by the following conditions:
• Poor draft caused by improper stack design. (See Section 4.)
• Poor draft caused by improper adjustment of the barometric damper. (See Above)
• Incorrect combustion air band setting on the burner. (See Section 6.)
• Furnace flues are plugged with ash. (See Section 9.)
• Exhaust fans in your building are sucking gases down the stack. (See following pages)
Operator's Manual: Models Saturn™ 140 & Saturn™ 230
ADJUST THIS WEIGHT
TO OBTAIN PROPER TO OBTAIN PROPER
DRAFT OVERFIRE
Figure 8B - Adjustment of Barometric Damper
8-2
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