General • Maintenance

WeatherMaker® Single-Packaged Rooftop Units 50 A: Quarterly Maintenance

This procedure is for the quarterly maintenance of your unit. It has instructions for cleaning the unit by way of inspection. It also focuses on main burners, flue gas passageways.

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10/24/2021

WeatherMaker® Single-Packaged Rooftop Units 50 A: Quarterly Maintenance

This procedure is for the quarterly maintenance of your unit. It has instructions for cleaning the unit by way of inspection. It also focuses on main burners, flue gas passageways.

Cleaning

Inspect unit interior at beginning of each heating and cooling season and as operating conditions require. Remove unit side panels and/or open doors for access to unit interior

MAIN BURNERS

At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner flames and adjust if necessary. Check spark gap. See Fig. 42. Refer to Main Burners section on page 147.

FLUE GAS PASSAGEWAYS

The flue collector box and heat exchanger cells may be inspected by removing gas section access panel, flue box cover, collector box, and main burner assembly (Fig. 43 and 44). Refer to Main Burners section on page 147 for burner removal sequence. If cleaning is required, clean all parts with a wire brush. Reassemble using new high-temperature insulation for sealing.

FIG. 44

COMBUSTION-AIR BLOWER

Clean periodically to assure proper airflow and heating efficiency.

Inspect blower wheel every fall and periodically during heating season.

ROUND TUBE PLATE FIN COIL MAINTENANCE AND CLEANING RECOMMENDATIONS

Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and removal of harmful residues will greatly increase the life of the coil and extend the life of the unit. The following maintenance and cleaning procedures are recommended as part of the routine maintenance activities to extend the life of the coil.

Remove Surface Loaded Fibers

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 can be easily bent over and damage to the coating of a protected coil) 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 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.

Source: Carrier (www.shareddocs.com)