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CAUTION: Solutions used to clean coils must
not be corrosive to metals or materials used in
the manufacturer of this equipment. If cleaning
solutions are applied through means of high
pressure spray, care must be taken to avoid
damaging the coil fi ns.
2. Condensate Drain Pan – Periodically
fl
ush the
condensate pan and drain system with a water
hose.
F. Gaskets
Gaskets are used on doors, inspection covers, some
fi
lter racks, and some outdoor air dampers. Inspect
gaskets periodically and repair or replace as required.
G. Caulking
Inspect cabinet and add caulking as required.
H. Casing
Periodic cleaning of the casing is recommended to
remove dirt, grease and corrosive substances that
may injure
fi
nish. Rusted or corroded areas should be
cleaned and painted.
I. Support
Inspect the entire support structure to be sure
everything is
fi
rmly in place.
J. Heater
1. At least a yearly inspection is recommended
for heating installations and more frequently for
process applications in year-round operation. Your
own experience is the best guide in determining
frequency of inspection, but as a minimum the
following procedure should be followed:
a. Shut the system down totally, disconnecting or
locking out power supply so there can be no
accidental start-up during inspection.
b. Inspect the burner carefully, including upstream
and downstream sides of mixing plates as well
as burner body face. Note that complete burner
assembly may have to be removed for proper
inspection and cleaning. Any accumulation of
scale or foreign material on either side of the
mixing plates should be removed with a wire
brush. Check visually that no holes in the mixing
plates are blocked. If any burner ports are
plugged (even partially) clear them with a piece
of wire. See Maintenance of 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 fasteners. The
mixing plates on the burner may display “hairline”
cracks. These cracks are normal, and caused by
thermal stresses occurring during combustion.
The presence of these “hairline” cracks in no
signi
fi
cant way affects the combustion ef
fi
ciency
or performance of the heater. Should a large
opening develop, it may cause dif
fi
culties in cross
ignition of
fl
ame across the face of the burner. If
this does occur, the speci
fi
c mixing plate or plates
involved
must
be replaced.
c. Put system back into operation and view burner
while cycling through full
fi
ring range. This will
give a visual check for blocked burner ports.
2. Inspect the
fl
ame rod and ignition electrode for dirt
and moisture. Wipe off if necessary. Examine for
any evidence of premature arcing. If in doubt, check
continuity of
fl
ame rod to be sure it is not grounding
out. Replace if required.
The porcelain on the ignition electrode must be
intact - not cracked. The spark gap should be 1/8
of an inch on Mestek burners.
3. Replace all access panels which have been removed
and operate the unit for a test period. Check for
normal response and function of all controls.
4. Check all gas piping for possible leaks using a soap
bubble solution.
5. Inspect the support means to be sure that
everything is
fi
rmly anchored in place.
