Carrier 50TCQA04 Installation Instructions Manual

Also see for WeatherMaker 50TCQA07: Installation instructions Installation instructions Service and maintenance instructions

11Curb should be level. This is necessary for unit drain tofunction properly. Unit leveling tolerances are show inFig. 7. Refer to Accessory Roof Curb InstallationInstructions for additional information as required.A-B0.5″ (13)B-C1.0″ (25)A-C1.0″ (25)MAXIMUM ALLOWABLEDIFFERENCE IN. (MM)a50--- 9658Fig. 7 -- Unit Leveling TolerancesInstall insulation, cant strips, roofing felt, and counterflashing as shown. Ductwork must be attached to curb andnot to the unit. The accessory thru--the--base powerpackage must be installed before the unit is set on the roofcurb.If electric and control wiring is to be routed through thebasepan, attach the accessory thru--the--base serviceconnections to the basepan in accordance with theaccessory installation instructions.NOTE: The gasketing of the unit to the roof curb iscritical for a watertight seal. Install gasket supplied withthe roof curb as shown in Fig. 6. Improperly appliedgasket can also result in air leaks and poor unitperformance.Slab Mount (Horizontal Units Only) —Provide a level concrete slab that extends a minimum of6 in. (150 mm) beyond unit cabinet. Install a gravel apronin front of condenser coil air inlet to prevent grass andfoliage from obstructing airflow.NOTE: Horizontal units may be installed on a roof curbif required.Alternate Unit Support (In Lieu of Curb or SlabMount) —A non--combustible sleeper rail can be used in the unit curbsupport area. If sleeper rails cannot be used, support the longsides of the unit with a minimum of 3 equally spaced 4--in. x4--in. (102 mm x 102 mm) pads on each side.Step 5 — Field Fabricate DuctworkCabinet return-air static pressure (a negative condition)shall not exceed 0.35 in. wg (87 Pa) with economizer or0.45 in. wg (112 Pa) without economizer.For vertical ducted applications, secure all ducts to roof curband building structure. Do not connect ductwork to unit.Fabricate supply ductwork so that the cross sectionaldimensions are equal to or greater than the unit supplyduct opening dimensions for the first 18 in. (458 mm) ofduct length from the unit basepan.Ducts passing through unconditioned spaces must beinsulated and covered with a vapor barrier.If a plenum return is used on a vertical unit, the returnshould be ducted through the roof deck to comply withapplicable fire codes.PROPERTY DAMAGE HAZARDFailure to follow this caution may result in damageto roofing materials.Membrane roofs can be cut by sharp sheet metaledges. Be careful when placing any sheet metal partson such roof.CAUTION!For Units with Accessory Electric Heaters —All installations require a minimum clearance tocombustible surfaces of 1--in. (25 mm) from duct for first12--in. (305 mm) away from unit.Outlet grilles must not lie directly below unit discharge.NOTE: A 90--degree elbow must be provided in theductwork to comply with UL (Underwriters Laboratories)code for use with electric heat.PERSONAL INJURY HAZARDFailure to follow this warning could cause personalinjury.For vertical supply and return units, tools or partscould drop into ductwork and cause an injury. Installa 90--degree turn in the return ductwork between theunit and the conditioned space. If a 90--degree elbowcannot be installed, then a grille of sufficient strengthand density should be installed to prevent objectsfrom falling into the conditioned space. Due toelectric heater, supply duct will require 90--degreeelbow.! WARNINGStep 6 — Rig and Place UnitUNIT DAMAGE HAZARDFailure to follow this caution may result inequipment damage.All panels must be in place when rigging. Unit is notdesigned for handling by fork truck.If using top crate as spreader bar, once unit is set,carefully lower wooden crate off building roof top toground. Ensure that no people or obstructions arebelow prior to lowering the crate.CAUTION!