Greenheck DG / DGX Industrial Space Heating (464044 IOM) (Pre-2009) - Manual (Page 26)

Maintenance - Fall
Start-Up
Repeat the Blower Start-Up procedure #5 and Direct Gas Start-Up procedure #1, 2 and 4. 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 figure #29.
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. See figure #29.
Replace or tighten any loose or missing fasteners on the mixing plates. Always use zinc plated or stainless steel
fasteners.
Inspect and clean the flame and spark rod. Occasional
replacement of the flame rod and spark rod may be
necessary to insure optimum unit performance. See
figure #29.
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 check
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.
M - 3
Figure 29. Burner
Flame Rod
Mixing Plate Holes Burner Ports
Spark Rod