Back

WeatherExpert® Ultra High-Efficiency Single-Packaged Rooftop Units 48 LC: Seasonal Maintenance

This procedure is for the seasonal maintenance of your unit. It also has a list of items that should be checked at the beginning of each season (or more often if local conditions and usage patterns dictate).
MaintainX
05/03/2021

WeatherExpert® Ultra High-Efficiency Single-Packaged Rooftop Units 48 LC: Seasonal Maintenance

8 steps
This procedure is for the seasonal maintenance of your unit. It also has a list of items that should be checked at the beginning of each season (or more often if local conditions and usage patterns dictate).
  • SEASONAL MAINTENANCE

  • These items should be checked at the beginning of each season (or more often if local conditions and usage patterns dictate):

  • Air Conditioning

  • Heating

  • Economizer or Outside Air Damper

  • Air Filters and Screens

  • Each unit is equipped with return air filters. If the unit has an economizer, it will also have an outside air screen. If a manual outside air damper is added, an inlet air screen will also be present.

  • Each of these filters and screens will need to be periodically replaced or cleaned.

  • RETURN AIR FILTERS

  • Return air filters are disposable fiberglass media type. Access to the filters is through the small lift-out panel located on the rear side of the unit, above the evaporator/return air access panel. (See Fig. 1.)

  • Screenshot2021-01-19at12.16.32PM.png
  • To remove the filters:

  • To re-install the access panel:

  • IMPORTANT: DO NOT OPERATE THE UNIT WITHOUT THESE FILTERS!

  • OUTSIDE AIR HOOD

  • Outside air hood inlet screens are permanent aluminum-mesh type filters. Check these for cleanliness. Remove the screens when cleaning is required. Clean by washing with hot lowpressure water and soft detergent and replace all screens before restarting the unit. Observe the flow direction arrows on the side of each filter frame.

  • ECONOMIZER INLET AIR SCREEN

  • This air screen is retained by filter clips under the top edge of the hood. (See Fig. 3.) FIG. 3

  • MANUAL OUTSIDE AIR HOOD SCREEN

  • SUPPLY FAN (BLOWER) SECTION

  • ! WARNING

  • ELECTRICAL SHOCK HAZARD

  • Failure to follow this warning could result in personal injury or death.

  • Before performing service or maintenance operations on unit, LOCKOUT/TAG-OUT the main power switch to unit. Electrical shock and rotating equipment could cause severe injury.

  • Supply Fan (Direct-Drive)

  • All FC units have the EcoBlue™ direct drive vane axial fan system. The fan is driven by an ECM motor with speed that is user set through the Unit Control Board (UCB). Speeds are fully configurable from 40% to 100% of motor’s maximum speed. See Fig. 5 and 6.

  • FIG. 6

Please note that any procedure, checklist, or other document available in the MaintainX Global Procedure Library is provided for general education and information only and does not constitute legal, medical, or financial advice. MaintainX makes the materials available AS IS and AS PROVIDED, without warranties of any kind. By downloading or using any such materials, you assume the risk that they may not be appropriate for your specific situation and agree that you are solely responsible for any such use, including compliance with applicable law and with meeting any conditions of product warranties.