4
The best way to correct this is to insure that you do not have more than -.02" of negative
water column draft at the breeching or outlet of the unit.
If you have an excess draft situation, the installation of a "neutral pressure point adjuster",
(see
Figure 1, page 3
) will be required.
The adjuster is a device that will reduce excessive draft and draft regulator flow. It is espe-
cially helpful with powered draft devices and excessive chimney draft situations. Both situ-
ations can cause flame problems, condensation and chimney connector damage.
• Start by cutting a piece of sheet metal as shown in
Figure 1, page 3,
to form the
adjuster.
• In detail
'A',
page 3, start by making a cut about 1/3 diameter through the fluepipe.
• Insert the adjuster into the fluepipe, start the burner and set breeching draft for -.02"
W.C.
• When adjustment is complete, scribe adjuster with line around pipe,
'B'.
• Make a second line about 1" above pipe radius line.
• Trim off the excess stock as shown in
'C'
and then slit the stock between the lines ver-
tically. Bend the segments in alternate directions.
• Replace the adjuster, start the burner and verify settings taken earlier.
• If unchanged, bend tabs against fluepipe, drawing
'D',
and anchor in place with sheet
metal screws. Seal any joints with high temp silicone and the adjuster is completed.
The adjuster will reduce the velocity and strength of the draft currents and allow you to
make a permanent and safe adjuster that cannot be adjusted again.
NOTE: Before locking the adjuster in its final position, make sure that the final firing rate
has been set and that all draft settings have been made and are final.
B. ROOF CLEARANCES
Standard roof clearances apply. It is the responsibility of the installer to ensure they are ade-
quate.
C. HEAT EXTRACTORS
The MUNCHKIN OFB oil fired boiler is not approved for use with a heat extractor mounted
in the breeching or fluepipe.
PART III. NATURAL DRAFT APPLICATIONS
CAUTION
After placing the boiler within close proximity to the venting system, the
following basic guidelines should be observed that will prevent the
following conditions from occurring:
COMBUSTION AIR AND VENTILATION
