Carrier 48MPD Installation, Start-up And Service Instructions Manual

Contents

INSTALLATIONJobsite Survey — Complete the following checks be-fore installation.1. Consult local building codes and the NEC (NationalElectrical Code) (ANSI/NFPA [National Fire ProtectionAssociation] 70) for special installation requirements.2. Determine unit location (from project plans) or select unitlocation.3. Check for possible overhead obstructions which may in-terfere with unit lifting or rigging.Do not lift unit with forklift truck. Move unit withoverhead rigging only.Unit Placement — Inspect unit for transportation dam-age. File claim with transportation agency.Provide clearance around and above unit for airflow, safety,and service access. Do not restrict top (area above con-denser fans) in any way. Allow at least 6 ft on all sides forrated performance, code compliance, and service.Check unit dimensional drawings for unit arrangement andminimum performance and service clearances.Do not install unit in an indoor location. Do not locate airinlets near exhaust vents or other sources of contaminatedair.On units equipped with power exhaust option, highvelocity air is exhausted out the hood. Unit should bepositioned with at least 10 ft clearance between the exhausthood and any obstruction. Although unit is weatherproof, guardagainst water from higher level runoff and overhangs.Level by using unit frame as a reference. Physical data isshown in Tables 1-4.Roof Mount — Check building codes for weight distri-bution requirements. Unit weight is shown in Table 1. Unitmay be mounted on class A, B, or C roofing material.ROOF CURB — Assemble and install as described in in-structions shipped with the accessory. Accessory roof curband information required to field fabricate a roof curb is shownin Fig. 1 and 2. Install insulation, cant strips, roofing, andcounter flashing as required. For unit condensate drain to func-tion properly, curb must be level or within tolerances shownin Fig. 1 and 2.STEEL BEAMS — If roof curb is not used, support unitwith steel beams along its entire length and then support steelas required. As a minimum, unit must be supported acrossits width at each lifting lug location.Slab Mount — Provide a level concrete slab that ex-tends beyond unit cabinet at least 6 inches. Make a slab 8 in.thick with 4 in. above grade. Use gravel apron in front ofcondenser coil air inlet to prevent grass and foliage from ob-structing airflow. Ensure that slab is of sufficient height toallow for 7-in. condensate trap.Field-Fabricated Ductwork — Units are designed forvertical supply/return only. Field-fabricated ductwork shouldbe attached to the roof curb. Supply and return duct dimen-sions are shown in Fig. 1-6.To attach ductwork to roof curb, insert duct approxi-mately 10 to 11 in. up into roof curb. Connect ductwork to14-gage roof curb material with sheet metal screws drivenfrom inside of the duct.Secure all ducts to the building structure, using flexibleduct connectors between roof curb and ducts as required. Ductspassing through an unconditioned space must be insulatedand covered with a vapor barrier. Outlet grilles must not liedirectly below unit discharge. The return duct must have a90-degree elbow before opening into the building space ifunit is equipped with power exhaust.Design supply duct strong enough to handle expected staticpressures.For vertical supply and return units, tools or parts coulddrop into ductwork and cause an injury. Install 90 de-gree turns in the supply and return ductwork betweenthe unit and the conditioned space. If a 90 degree elbowcannot be installed, then grilles of sufficient strength anddensity should be installed to prevent objects from fall-ing into the conditioned space.Rigging — Do not drop unit; keep upright. Use spreaderbars over unit to prevent sling or cable damage. Leave con-denser coil shipping protection in place while rigging toprevent coil damage. All lifting lugs MUST be used whenlifting unit.Level by using unit frame as a reference. See Fig. 7 forinformation. Unit and accessory weights are shown inTables 1-4. Weight distribution and center of gravity can befound in Fig. 8.Condensate Drains — The condensate drain connec-tion is a 1 1 ⁄2 -in. NPT pipe connection located on the righthand side of the unit. See Fig. 9.NOTE: Use a trap of at least 7-in. deep.Condenser Coil Shipping Covers — Remove anddiscard.Install Outdoor Hoods1. Outdoor-air hoods are shipped bolted to the unit in a ship-ping position. To open hoods, remove the 3 holddownbars holding the air hood in shipping position. SeeFig. 10.2. Lift up the highest hood top and swing out hood sides toform the outside frame of the air hood. Fasten hood topto hood sides at middle and top holes only, using two screwson each side. See Fig. 11.3. Remove the bottom hood block-off plate and set aside.4. Swing up second hood (from the top of unit) into placeand fasten to hood sides with screws provided using up-per hole only.5. Swing up third hood (from the top of unit) into place andfasten to hood sides with screws provided using upperhole only.6. Swing up fourth hood (bottom hood) into place. Beforefastening hood to hood sides, swing down bottom filterrack. Fasten hood to hood sides with screws provided us-ing upper hole only.7. Attach block off plate removed from Step 3.8. Clip wire tie holding filter track. Swing filter track intoposition and fasten to hood sides using screws provided.Repeat until all 4 filter racks have been installed.9. Apply a bead of RTV or similar sealant to corner of eachhood at pivot point to prevent water leaks.Copy continues on page 14.3