Greenheck DG / DGX with Pilot Ignition (463555 IOM) (Pre-2008) - Manual (Page 44)

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Maintenance
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 check 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.
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.
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 operation environment and should be check
periodically over the heating season.
Evaporative Coolers
The water should be shut off and all the lines drained when the outside temperature drops below 45°F.
Remove drain plugs for the winter.
Clean all interior parts of any mineral deposits or foreign materials that may have built up during the cooling
season.
Replace any worn or non-functioning parts.
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.