Greenheck Fan Part #470655 manual Maintenance - Fall, High Limit, Burner, Gas Train, Start-Up

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 Spark Rod

Mixing Plate Holes Burner Ports

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.

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.

26 DGX Industrial Space Heating

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