Greenheck Warehouse Make Up Air Unit DGX-108

Warning: Ensure the burner is turned off and cooled down before starting the maintenance.

Inspect the burner for accumulation of scale on both the upstream and downstream sides of the mixing plates.

Remove foreign material 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. Do not enlarge burner ports when clearing a blockage as performance could be affected.

Replace or tighten any loose or missing fasteners on the mixing plates.

Always use appropriate fasteners.

Inspect and clean the flame rod or UV scanner.

Occasional replacement of the flame rod and spark rod may be necessary to ensure optimum unit performance.

Warning: This procedure should be performed by trained personnel only.

Close valves on the supply and return lines

Open drain valves and/or drain plug

Remove vent plug to allow coil to drain faster

After coil is fully drained, connect a blower to the caps. Do not connect the blower to the air vent or drain plug

Close the vent plug on the header that the blower is connected to. Open the drain valve or cap on the other header

Place mirror at discharge. If the mirror fogs up, repeat procedure until no fog appears on the mirror

After drying the coil, wait a few minutes then repeat Step #5

Warning: This maintenance check requires trained personnel with PPE!

Check for wear, tension, alignment, and dirt accumulation

Measure the deflection in the belt

Check the alignment using a straight edge across both sheaves

Account for differences in sheave width

Check for premature or frequent belt failures

Check for abnormally high belt tension or drive misalignment

Check for abnormally low belt tension

Ensure belts are not pried on or off the sheave

Test the circulating fluid for sediment, corrosive products and biological contaminants

Describe the corrective measures taken if any contaminants were found

Maintain adequate fluid velocities and proper filtering of the fluid

Are automatic air vents utilized?

If automatic air vents are not utilized, periodic venting of the coil is recommended to remove accumulated air

Sign off on the chilled water coil maintenance

Warning: This service requires trained personnel with PPE!

Is there oil and dust accumulation on the wheel?

If there is oil and dust accumulation, proceed with the cleaning procedure

Was the wheel cleaned properly?

Was the housing cleaned properly?

Enter the balance reading of the wheel after cleaning

Sign off on the supply wheel service