Carrier 50HCQ12 Installation Instructions Manual

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7A-B0.5” (13)B-C1.0” (25)A-C1.0” (25)MAXIMUM ALLOWABLEDIFFERENCE IN. (MM)ABCC10001Fig. 4 -- Unit Leveling TolerancesStep 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.Insulate and weatherproof all external ductwork, joints,and roof openings with counter flashing and mastic inaccordance with applicable codes.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.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.! WARNINGPROPERTY 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!Step 6 — Rig and Place UnitWhen the unit is ready to be rigged and no longer will belifted by a fork truck, the wood protector under the basepanmust be removed. Remove 4 screws from each base rail.Wood protector will drop to the ground. See instructions onthe unit base rails.Keep unit upright and do not drop. Spreader bars arerequired. Rollers may be used to move unit across a roof.Level by using unit frame as a reference. See Table 1 andFig. 5 for additional information.Lifting holes are provided in base rails as shown in Fig. 5.Refer to rigging instructions on unit.UNIT 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.CAUTION!Before setting the unit onto the curb, recheck gasketing oncurb.50HCQD12