Carrier 48EN Installation, Operation And Maintenance Instructions

Contents

Carrier 48EN Installation, Operation And Maintenance Instructions Manual pdf 19 page image

Packaged rooftop unitswith integrated gas burner1912. MAINTENANCEV-220004Caution: Before intervening in the unit, cut off mainpower.Recommendations:In general, a corrosion control must be performed on the metallic partsof the unit (frame, bodywork, exchangers, electric panel, etc.). All theelectric connection states must be checked as well, as well as the airtightness of the different circuits.Next, some recommendations are stated to perform the cleaning ofthe unit's components:Air coil- Check that the coil is free from dust and grease.- Cleaning the accumulated dust on the coil can be performed witha vacuum cleaner perpendicular to the fins or with a low-pressurewater cleaner. Grease can be removed with water with degreaser.Do not put stress on the fins as they could deform.Condensates drain pan- Check that the condensates pan is clean. There should be nostagnant water.- Check that the drain is not clogged.- Cleaning of the pan can be done with water and non-abrasivedetergent.Gravimetric filtersOpacimetric filtersTabs for displacement of theopacimetric filtersAir fi lters- Clean usually. Depending on the installation conditions, the filteraspect must be examined to define the cleaning periodicity.- Gravimetric filters: Cleaning the filtering mesh can be done with ahousehold vacuum cleaner, or by submerging it in water.- Creased opacimetric filters: these have to be replaced. Foreseereplacement.Filter removal:The frames with the gravimetric filters as well as opacimetric frames (ifthe unit has includes them) are assembled over a sheet steel profile.Frames are moved by lifting the tab and dragging along the rail.The minimal maintenance operations and their periodicity will be madeaccording to the national regulations.Any intervention on the electric cooling components must be made bya qualified and authorized technician.Centrifugal fan- Verify that the turbine and the motor remain clean.- Foresee having a spare belt set for the fans.- The motors and the fans have bushings that have been lubricated andsealed and, thus, do not need further lubrication.Tabs for displacement of thegravimetric filtersMixing boxes and free-coolingIn units with mixing box assemblies withmotorised dampers (MS, MA and MC0assemblies) it is advisable to check thecondition of the servomotor. In theseunits the mixing damper is locked tothe outdoor air inlet.Outdoor air damperServomotor