Daikin Packaged Rooftop System DPSO28AHMG4DV-4

The supply, condenser and exhaust fan motors are permanently lubricated and require no periodic lubrication.

Each unit as shipped is trim balanced to operate smoothly. To provide satisfactory operation after shipping and installation, use accepted industry guidelines for field balancing fans.

NOTE: Excessive vibration from any cause contributes to premature fan and motor bearing failure. Monitor overall vibration levels every six months of operation. An increase in levels is an indication of potential trouble.

Fan passed the post-maintenance test?

Sign off on the fan maintenance

Check vent terminal screens for blockages and accumulation

Heater and the Venting System shall be inspected once a year by a qualified service agency.

Check all valves, piping and connections of Gas Train for leakage with a rich soap solution or UL 913 combustible gas leak detector. Any bubbling is considered a leak and must be eliminated.

Inspect and clean flame rod, ignition electrode, and burner manifold

Remove any debris that may have accumulated in the drain pain and drain

WARNING: Prior to cleaning the unit, turn off and lock out the main power switch to the unit and open all access panels

The following cleaning procedures are recommended as part of the routine maintenance activities for Option E Coated Coils. Documented routine cleaning of Option E Coated Coils is required to maintain warranty coverage.

1. Remove Surface Loaded Fibers: Surface loaded fibers or dirt should be removed prior to water rinse to prevent further restriction of airflow.

2. If unable to back wash the side of the coil opposite that of the coils entering air side, then surface loaded fibers or dirt should be removed with a vacuum cleaner. If a vacuum cleaner is not available, a soft non-metallic bristle brush may be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges bent over) if the tool is applied across the fins.

NOTE: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil. This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity clean water rinse.

3. Periodic Clean Water Rinse: A monthly clean water rinse is recommended for coils that are applied in coastal or industrial environments to help to remove chlorides, dirt and debris. An elevated water temperature (not to exceed 130°F) will reduce surface tension, increasing the ability to remove chlorides and dirt. Pressure washer PSI must not exceed 900 psig and the nozzle should remain at least 1 foot from the coil to avoid damaging fin edges.

Surface loaded fibers or dirt removed?

Coil cleaned with low velocity clean water rinse?

Check cabinet air filters and replace if dirty

After heavy snowfall verify that combustion air intakes are not blocked by snow

Periodically check during periods of snow accumulation as drifting may also lead to combustion air intake blockage

Open a door on each section and verify that no moisture or debris is accumulating in the unit monthly during preparation for storage (p.137);

Warning: This maintenance requires trained and experienced service technician

Warning: Fuel pressure settings and control settings should be made only by persons thoroughly experienced with the burner and control system

Warning: Always replace covers on burner controls and boxes as the electrical contacts are sensitive to dust and dirt

Warning: Installation and maintenance must be performed only by qualified personnel who are experienced with this type of equipment and familiar with local codes and regulations

Warning: Gas or Hot Water Piping: A qualified Architect or Systems HVAC Design Engineer familiar with piping design, local codes and regulations, must provide piping design

Danger: Moving machinery and electrical power hazards. May cause severe personal injury or death. Disconnect and lock off all power before servicing equipment

Warning: Sharp edges are inherent to sheet metal parts, screws, clips, and similar items. May cause personal injury

Warning: Disconnect all electric power to the unit when servicing control panel components

Danger: Hazardous voltage. May cause severe injury or death. Disconnect electric power before servicing equipment