Fall - Greenheck DGX Installation, Operation And Maintenance Manual

Maintenance - Fall
Start-Up
Repeat the Blower Start-Up Step #5 and Direct Gas
Start-Up Step #1, 2 and 4a or 4b. This will ensure that
the gas and air are set properly before the heating
season begins and should lead to trouble free operation
all winter.
High Limit
The high limit switch may have tripped over the summer,
it should be checked and reset if necessary.
Burner
Inspect the burner for accumulation of scales on both
the upstream and downstream sides of the mixing
plates. Any scaling or foreign material should be
removed with a wire brush. Refer to image below.
Visually check that all holes in the mixing plates are
clear. If any burner ports are plugged (even partially),
clear them with a piece of wire or another appropriate
tool.
Replace or tighten any loose or missing fasteners on the
mixing plates. Always use zinc plated or stainless steel
fasteners.
Flame Rod
Mixing Plate Holes
Burner
Inspect and clean the flame and spark rod. Occasional
replacement of the flame rod and spark rod may be
necessary to ensure optimum unit performance.
If a UV sensor is used instead of a flame rod, the
sensor's lens should be cleaned at least once a year.
The sensor may require more frequent cleaning,
depending on the operating environment and should be
checked periodically over the heating season.
WARNING
Do not enlarge burner ports when clearing a blockage,
performance could be affected.
NOTE
Flame rods can last many years, but because of
thermal expansion of the porcelain, flame rods can fail
over time.
26 DGX Industrial Space Heating
Gas Train
The gas connections, joints and valves should be
checked annually for tightness. Apply a soap and water
solution to all piping; watch for bubbling which indicates
a leak. Other leak testing methods can be used.
Spark Rod
Burner Ports
®