Grain Systems PNEG-526 - Manual (Page 107)

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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. 1/01
Page 5550-S-11 Series NP-LE AIRFLO ® Burners
Periodic maintenance will insure continued trouble-
free operation of your Series NP-LE AIRFLO ® Burner
system.
At least a yearly inspection is recommended for
make-up air heating installations and more frequently
for process applications in year-round operation. Your
own experience is the best guide in determining
frequency of inspection. As a minimum, the following
procedure should be followed:
1.
Shut the system down totally. Disconnect or lock
out power supply so there can be no accidental
start-up during inspection.
2. Inspect the burners carefully, including upstream
and downstream sides of mixing plates as well as
burner body face. Any accumulation of scale or
foreign material on either side of the mixing plates
should be removed with a wire brush. Check
Maintenance Instructions
visually that no holes in the mixing plates are
blocked. See next page (5550-S-12) for inspec-
tion and maintenance instructions for gas ports.
WARNING: Do not enlarge burner ports or
performance may be drastically affected.
If any mixing plates are loose or missing fasteners,
tighten/replace as necessary. Always use zinc plated
or stainless metric fasteners.
3.
Put system back into operation and, if possible,
view from downstream side while cycling burner
through full firing range. This will give a visual
check for blocked burner ports.
4. Observe flame pattern and, if necessary, take
steps to correct velocity and/ or air distribution
problems.
If adverse operating conditions or accidental
damage make it necessary to replace either individual
mixing plates or complete burner sections, follow this
procedure:
1.
Identify necessary replacement parts from
component identification drawings on preceding
pages, then order required quantities of each.
Consider carefully the economics of installing a
complete replacement burner instead of replacing
individual parts. Once exposed to actual flame
temperatures, burner castings harden and the
removal and replacing of fasteners can be time
consuming and difficult. Accessibility may also be
severely limited requiring removal of complete
assembly in any case.
2. When necessary parts have been received,
remove damaged mixing plates or burner sec-
tions, taking care not to damage remaining
portion of burner. If new burner bodies are being
installed, place body gasket on the mating
flanges of loose cast iron bodies. (This is neces-
sary to provide a gas-tight seal after assembly.)
Insert new section into place, making sure that
both flanges are square and flush, then bolt
sections together.
3. Install new mixing plates, back up bars and plate
support brackets to the new body castings.
4. If end plate sets must be installed, put in position
between mixing plates and insert fasteners
loosely. Do not tighten at this time.
5. Tighten burner body bolts making sure that
mating cast iron flanges remain square and flush.
6. Align mixing plates and check that body gaskets
are in position and properly aligned. Tighten all
mixing plate mounting screws and bolts.
7. Double check that all fasteners are secure.
8. Return burner to operation, observing flame
carefully at all firing rates.
Repair / Replacement Procedures