Carrier Performance 48VL-A Installation Instructions Manual

Also see for 48VL-A: Owner's information manual

Contents

2signal words: DANGER, WARNING, and CAUTION. Thesewords are used with the safety--alert symbol. DANGER identifiesthe most serious hazards which will result in severe personal injuryor death. WARNING signifies hazards which could result in per-sonal injury or death. CAUTION is used to identify unsafe practic-es which may result in minor personal injury or product and prop-erty damage. NOTE is used to highlight suggestions which willresult in enhanced installation, reliability, or operation.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Before installing or servicing system, always turn off mainpower to system and install lockout tag. There may bemore than one disconnect switch. Turn off accessory heaterpower switch if applicable.! WARNINGFIRE, EXPLOSION, ELECTRICAL SHOCK ANDCARBON MONOXIDE POISONING HAZARDFailure to follow this warning could result in personalinjury or unit damage.A qualified installer or agency must use onlyfactory--authorized kits or accessories when modifying thisproduct.WARNING!INTRODUCTIONThe 48VL--A unit (see Fig. 1) is a fully self--contained,combination Category I gas heating/electric cooling unit designedfor outdoor installation (See Fig. 3 and 4 for unit dimensions). Allunit sizes have return and discharge openings for both horizontaland downflow configurations, and are factory shipped with alldownflow duct openings covered. Units may be installed either ona rooftop or on a cement slab. (See Fig. 5 for roof curbdimensions).In gas heating mode, this unit is designed for a minimumcontinuous return--air temperature of 55_F (13_C) db and amaximum continuous return--air temperature of 80_F (27_C) db.Failure to follow these return--air temperature limits may affectreliability of heat exchangers, motors, and other components.Models with an N in the fifth position of the model number arededicated Low NOx units designed for California installations.These models meet the California maximum oxides of nitrogen(NOx) emissions requirements of 40 nanograms/joule or less asshipped from the factory and must be installed in California AirQuality Management Districts or any other regions in NorthAmerica where a Low NOx rule exists.NOTE: Low NOx requirements apply only to natural gasinstallations.RECEIVING AND INSTALLATIONStep 1 — Check EquipmentIdentify UnitThe unit model number and serial number are stamped on the unitinformation plate. Check this information against shipping papers.Inspect ShipmentInspect for shipping damage before removing packaging materials.If unit appears to be damaged or is torn loose from its anchorage,have it examined by transportation inspectors before removal.Forward claim papers directly to transportation company.Manufacturer is not responsible for any damage incurred in transit.Check all items against shipping list. Immediately notify thenearest equipment distribution office if any item is missing. Toprevent loss or damage, leave all parts in original packages untilinstallation.If the unit is to be mounted on a curb in a downflow application,review Step 9 to determine which method is to be used to removethe downflow panels before rigging and lifting into place. Thepanel removal process may require the unit to be on the ground.Step 2 — Provide Unit SupportFor hurricane tie downs, contact distributor for details and PE(Professional Engineering) Certificate if required.Roof CurbInstall accessory roof curb in accordance with instructions shippedwith curb (See Fig. 5). Install insulation, cant strips, roofing, andflashing. Ductwork must be attached to curb.IMPORTANT: The gasketing of the unit to the roof curb iscritical for a water tight seal. Install gasketing material suppliedwith the roof curb. Improperly applied gasketing also can result inair leaks and poor unit performance.Curb should be level to within 1/4 in. (6 mm). This is necessaryfor unit drain to function properly. Refer to accessory roof curbinstallation instructions for additional information as required.Installation on older “G” series roof curbs.Two accessory kits are available to aid in installing a new “G”series unit on an old “G” roof curb.1. Accessory kit number CPADCURB001A00, (small chassis)and accessory kit number CPADCURB002A00, (largechassis) includes roof curb adapter and gaskets for theperimeter seal and duct openings. No additionalmodifications to the curb are required when using this kit.2. An alternative to the adapter curb is to modify the existingcurb by removing the outer horizontal flange and useaccessory kit number CPGSKTKIT001A00 which includesspacer blocks (for easy alignment to existing curb) andgaskets for the perimeter seal and duct openings. This kit isused when existing curb is modified by removing outerhorizontal flange.UNITS/STRUCTURAL DAMAGE HAZARDFailure to follow this caution may result in propertydamage.Ensure there is sufficient clearance for saw blade whencutting the outer horizontal flange of the roof curb so thereis no damage to the roof or flashing.WARNING!Slab MountPlace the unit on a solid, level pad that is at least 2 in. (51 mm)above grade. The pad should extend approximately 2 in. (51 mm)beyond the casing on all 4 sides of the unit. (See Fig. 2.) Do notsecure the unit to the pad except when required by local codes.48VL-- A