Greenheck Warehouse Make Up Air Unit DGX-118

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

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: Only trained personnel should perform this procedure

Motor greased in accordance with manufacturer’s recommendations

Water or solvents entered the motor or bearings?

Motor and bearings sprayed with steam, water or solvents?

Motor lubricated if fittings are provided

Sign off on the motor 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.