Daikin Packaged Rooftop System DPS028AHMG4DW-4

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.

Surface loaded fibers or dirt should be removed prior to water rinse to prevent further restriction of airflow.

Surface loaded fibers or dirt removed?

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.

Surface loaded fibers or dirt removed with a vacuum cleaner or a soft non-metallic bristle brush?

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.

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);

Check all moving parts for wear every six months

The Rebel exhaust fans are direct drive variable speed fan/motor combination, which do not have belts or pulleys to maintain

The bearings are permanently sealed and do not require periodic greasing. The Rebel 3-15 ton units have similar supply fans.

The Rebel 16-28 tons supply fans have a direct drive motor

These larger motors are not permanently sealed and will require greasing every 9000 hours

Sign off on the 9000 Hours / 6 Monthly Rooftop System Maintenance

The Rebel unit has many configurable options that can affect the refrigerant charge. Actual unit charge is given on the unit's data plate found on the inside of the control panel

The Rebel unit uses electronic expansion valves that maintain peak efficiency. Liquid sub-cooling and suction super heat float and should not be used as an indication that charge needs to be added or removed from the system

If a leak is suspected, the full charge should be removed and weighed. Weight should be compared against the unit nameplate data. Unit should be recharged with the amount given on the unit nameplate

POE and PVE oil is hygroscopic and does absorb moisture when exposed to atmosphere. Steps should be taken to minimize exposure time to atmosphere during any maintenance where the sealed system is to be opened

Rebel 003-015 refrigerant systems use only Polyvinylether (PVE) oil. Rebel 016-028 refrigerant systems use only Polyester (POE) oil

NOTICE: Do not use POE oil in DPS 003-015 refrigerant systems and do not use PVE oil in DPS 016-028 refrigerant systems

The entire system must be evacuated using a suitable vacuum pump

The quality of vacuum is measured using a suitable micron gauge that has been calibrated

CAUTION: Severe loss of charge may occur if the high refrigerant pressure switch is replaced before reclaiming the refrigerant. Replace pressure switch after reclaiming refrigerant

DANGER: Hazardous voltage. May cause severe injury or death. Disconnect electric power before servicing equipment. More than one disconnect may be required to de-energize the unit

Service Refrigerant Sensors or Switches

Service Optional Electric Heater

Measure continuity through all fuses

Check that all electrical connections are tight. Look for signs of arcing

Check the resistance to ground for each circuit. It should be infinite

Check the resistance phase to phase for each circuit