Greenheck Warehouse Make Up Air Unit DGX-120

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!

Gas connections, joints and valves are tight

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

Sign off on the gas train check

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

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

Is the media brushed lightly with a soft bristle brush while flushing with water?

Is the amount of mineral build-up reduced?

Is there a large amount of mineral build-up?

If yes, clean or replace the media and increase the water bleed-off or drain and fill rate.

Is the cooling media within its useful life of 3 to 5 years?

Is the evaporative media installed correctly after reinstallation?

Is the replacement media from the same manufacturer and the same size as the original media?

Sign off on the evaporative cooling module maintenance