m
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.
Cycle burner from minimum to maximum
and refine adjustment, if necessary.
For operation with interrupted pilot (as
recommended), shut off pilots and cycle burner
from minimum to maximum and back several
times to verify the flame is maintained.
15. When burner performance is satisfactory and
stable throughout the firing range, reconnect
control motor.
For “400” OVENPAK
®
Burners: Reconnect
linkage to control motor. Control linkage travel
must be such that burner crank is moved through-
out its complete travel, or cataloged capacities
and turndowns will not be achieved. If less than
full-rated burner capacity is required, linkage can
be adjusted to limit maximum output.
With interrupted pilot, it may be necessary to
set control for somewhat higher than minimum
burner setting to permit hold-in of flame detection
system without pilot.
CAUTION: Internal drive mechanism within the
control motor may be damaged if linkage is
adjusted so as to cause binding with burner in
high or low fire position.
16. Re-check differential gas pressure with unit at
operating temperature. Refine high fire setting if
necessary, considering differential pressure,
flame length, and appearance. Natural gas flame
should normally be predominantly clear blue but
possibly with semi-luminous tips. Dust or contami-
nants in the air stream may affect flame appear-
ance.
17. For “400” OVENPAK
®
Burners: Check for
contact between mixing cone and top-most
centering screw after system has reached
maximum operating temperature. If set screw
touches cone, back off an additional 1/8 turn on
top and both side set screws.
18. Plug all test connections not in use to avoid
dangerous fuel leakage. Replace equipment
cover caps and tighten linkage screws.
12. Re-check pilot ignition by closing pilot gas cock
or otherwise causing pilot outage. Re-light and
refine pilot gas adjustment as necessary to get
ignition within a second or two. The flame safe-
guard relays should now power your main fuel
Shut-Off Valve(s).
CAUTION: After completing steps above, re-
check all interlocking safety components and
circuitry to prove that they are properly in-
stalled, correctly set, and fully operational. If in
doubt, shut the system down, close pilot cock
and contact responsible individual before
proceeding further.
13. Establish main flame. With burner at low fire
position, back out main gas pressure regulator
adjusting screw (counter-clockwise) to get lowest
outlet pressure possible. Open all manual fuel
shut-off valves (automatic fuel shut-off valve
should already be open) so gas flows to burner
inlet. There should be little, if any, change in
flame appearance. Turn main regulator adjust-
ing screw in (clockwise) to obtain outlet pressure
of about 4"-6" wc higher than combustion cham-
ber pressure (2"-4" wc for propane, considerably
higher for some EB versions). Main flame should
now appear larger than pilot-only flame.
14. Establish high fire setting by slowly moving
burner toward high fire position while observing
gas pressure at burner gas test connection.
Refine main gas regulator adjustment as neces-
sary to provide correct differential pressure
(gauge to combustion chamber, see step 7) at
high fire. If pressure cannot be adjusted low
enough, a different regulator or regulator spring
may be necessary, or a limiting orifice valve (such
as Maxon's Series “BV”) should be added. Do
not, however, exceed 4" wc pressure drop
between regulator outlet and burner inlet.
CAUTION: If burner(s) go out, close shut-off
valve or shut main gas cock at once. Return to
minimum setting, re-light pilots if necessary,
then turn main gas on again. Check carefully
that every burner is lit before proceeding.
Page 2100-S-6
Start-Up Instructions
“400”, “200” OVENPAK
®
Burners
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