Grain Systems PNEG-526 - Manual (Page 100)

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CORPORATION
MUNCIE, INDIANA, USA
INDUSTRIAL COMBUSTION EQUIPMENT AND VALVES
Maxon practices a policy of continuous product improvement. It reserves the right to alter specifications without prior notice.
A good minimum fire should provide uniform
flame across the entire burner face, contained
within the zipper flame channel at the base of
burner mixing plates. Any thin spots or gaps
indicate uneven air velocity over the burner
which must be corrected or a higher minimum
fire established by continuing to turn in on the
minimum stop screw. (See drawing on page
5550-S-2.)
NOTE: If your Maxon NP-LE AIRFLO
® Burner
was furnished with an adjustable gradient type
Series "Q" or SYNCHRO
® Control Valve
instead of a Series "CV" Valve, refer to step
8A through 8I for specific instructions and
differences in adjustment procedures.
For Series “CV” Valves, skip to step 9.
A. From step #5, the automatic control motor
linkage has already been disconnected from
your adjustable gradient type control valve
and the valve is at its "minimum" position.
B. Open fuel supply and begin adjustment of
appropriate adjustable gradient valve by
turning in minimum (or lowest numbered)
screw until desired flame is achieved. (Main
fuel regulator may need adjusted at this
point.)
C. Once your flame is established and refined
at this position, and without advancing the
screw carrier quadrant higher, screw all
remaining screws down to at least the same
level as your first adjusted screw.
NOTE: A preliminary setting can be estab-
lished with all the remaining adjusting
screws. Generally, each succeeding screw
needs to be screwed in approximately one
full turn deeper than its preceeding screw. A
smooth "stair-step" gradient pre-set at this
point from low to high will simplify the
Page 5550-S-4
Start-Up Instructions
(cont'd.)
remaining adjustment steps.
D. Without advancing the SYNCHRO ® Valve
quadrant, screw down on #2 screw (one or
two turns). Then slowly advance the
SYNCHRO
® Valve quadrant to the #2
position. Refine flame appearance at this
new position #2.
E. Turn all higher-numbered screws in at least
as far as the one just adjusted, then turn
next one in as necessary to achieve desired
flame while rotating valve mechanism to that
position on indicator strip.
F. Repeat for each remaining screw.
NOTE: To avoid possible damage to cam
strips, always turn all higher-numbered
screws in as far as the last one adjusted.
G. Refine adjustment as needed, always
turning valve so that position indicator
matches screw being adjusted.
For more fuel, turn screw in (clockwise). for
less fuel, turn screw out (counter-clockwise).
If screws must be turned in flush with carrier
casting, increase fuel pressure and readjust
by starting at minimum over again.
H. Cycle system off and on, and through all
firing rates until satisfied with performance.
I. Reconnect control motor linkage and check
that operator does not "bind" and that all
interlocks are performing properly.
9. Adjust burner "high fire" by slowly rotating fuel
control valve crank arm towards its maximum.
Observe flame characteristics carefully. Flame
should remain a bright blue color with a length
beyond the mixing plates as indicated in capac-
ity/specification data. If flame becomes long and
yellow, gas pressure is too high and/or air
velocity is too low.
NOTE: Dust and/or chemicals entrained into
passing air stream may effect physical color of
flame. In this case, adjust burner for stable flame
shape and geometry.
To measure gas pressure, connect water
column (manometer) to the test connection in
burner's end plate. To determine air velocity, use
a velometer at the profile opening. Correct
velocities by increasing or decreasing profile
opening size.
If flame is too short, gas pressure may be too
low and should be increased or velocities are
too high and may need to be decreased. Note
that air velocities should be measured only
when the fan is handling air at the desired
control temperature.
Series NP-LE AIRFLO ® Burners
Adj. Screws
(under cover)
Handle for
Manual
Operation
Position
Indicator
Pointer
Locking Screw
for manual
operation