Greenheck Warehouse Make Up Air Unit DGX-109

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: Repair and replacement of the coil and the connecting piping, valves, etc., must be performed by a qualified individual.

Inspect the coil for signs of corrosion and/or leaks.

Inspect the coil’s surface for foreign material. If the coil surface needs cleaning, clean the coil from the leaving air-side so that foreign material will be washed out of the coil rather than pushed farther in.

Inspect and clean the drain pan to prevent the growth of algae and other organisms.

Be sure to read and follow the coil manufacturer’s recommendations before using any cleaning fluid.

Caution must be used to avoid injury when venting the coil. High pressure and/or high temperature fluids can cause serious injuries.

Sign off on the cooling coil maintenance.

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: 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 a trained professional

Gas connections, joints and valves are tight

Upload a photo of the applied soap and water solution to all piping

Any bubbling observed indicating a leak

Sign off on the gas train check