Greenheck Warehouse Make Up Air Unit DGX-112

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 the supply wheel operational?

If the supply wheel is not operational, report the issues to the maintenance team and stop the procedure

Check for oil and dust accumulation on the wheel

Upload a photo of the supply wheel before cleaning

Upload a photo of the supply wheel after cleaning

Enter the balance reading of the wheel after cleaning

Sign off on the supply wheel service

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

Is there a large amount of mineral build-up?

If there is a large amount of mineral build-up, clean or replace the media and increase the water bleed-off or drain and fill rate.

Is the cooling media older than 5 years?

If the cooling media is older than 5 years, replace it.

Select the type of media used for replacement

Sign off on the evaporative cooling module maintenance