Greenheck Warehouse Make Up Air Unit DGX-112

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 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: 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.

Filter maintenance is generally limited to cleaning and replacement.

If aluminum mesh filters are installed, they can be washed in warm soapy water.

An adhesive spray can be added to aluminum mesh filters to increase their efficiency.

If disposable filters are installed, they can be checked by holding up to a light source. If light cannot pass through the filter, it must be replaced.

When reinstalling filters, be sure to install them with the airflow in the correct direction. An airflow direction arrow is located on the side of the filters.

Replacement filters must be from the same manufacturer and the same size as the original filters provided with the unit.

Sign off on the filter 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