INSTALLATION
Jobsite Survey Ð Complete the following checks be- fore installation.
1.Consult local building codes and the NEC (National Electrical Code) (ANSI/NFPA [National Fire Protection Association] 70) for special installation requirements.
2.Determine unit location (from project plans) or select unit location.
3.Check for possible overhead obstructions which may in- terfere with unit lifting or rigging.
Do not lift unit with forklift truck. Move unit with overhead rigging only.
Unit Placement Ð Inspect unit for transportation dam- age. File claim with transportation agency.
Provide clearance around and above unit for air¯ow, safety, and service access. Do not restrict top (area above con- denser fans) in any way. Allow at least 6 ft on all sides for rated performance, code compliance, and service.
Check unit dimensional drawings for unit arrangement and minimum performance and service clearances.
Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.
On units equipped with power exhaust option, high velocity air is exhausted out the hood. Unit should be positioned with at least 10 ft clearance between the exhaust hood and any obstruction. Although unit is weatherproof, guard against water from higher level runoff and overhangs.
Level by using unit frame as a reference. Physical data is shown in Tables 1-4.
Roof Mount Ð Check building codes for weight distri- bution requirements. Unit weight is shown in Table 1. Unit may be mounted on class A, B, or C roo®ng material.
ROOF CURB Ð Assemble and install as described in in- structions shipped with the accessory. Accessory roof curb and information required to ®eld fabricate a roof curb is shown in Fig. 1 and 2. Install insulation, cant strips, roo®ng, and counter ¯ashing as required. For unit condensate drain to func- tion properly, curb must be level or within tolerances shown in Fig. 1 and 2.
STEEL BEAMS Ð If roof curb is not used, support unit with steel beams along its entire length and then support steel as required. As a minimum, unit must be supported across its width at each lifting lug location.
Slab Mount Ð 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 of condenser coil air inlet to prevent grass and foliage from ob- structing air¯ow. Ensure that slab is of sufficient height to allow for 7-in. condensate trap.
Field-Fabricated Ductwork Ð Units are designed for vertical supply/return only. Field-fabricated ductwork should be 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 to 14-gage roof curb material with sheet metal screws driven from inside of the duct.
Secure all ducts to the building structure, using ¯exible duct connectors between roof curb and ducts as required. Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier. Outlet grilles must not lie directly below unit discharge. The return duct must have a 90-degree elbow before opening into the building space if unit is equipped with power exhaust.
Design supply duct strong enough to handle expected static pressures.
For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install 90 de- gree turns in the supply and return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then grilles of sufficient strength and density should be installed to prevent objects from fall- ing into the conditioned space.
Rigging Ð Do not drop unit; keep upright. Use spreader bars over unit to prevent sling or cable damage. Leave con- denser coil shipping protection in place while rigging to prevent coil damage. All lifting lugs MUST be used when lifting unit.
Level by using unit frame as a reference. See Fig. 7 for information. Unit and accessory weights are shown in Tables 1-4. Weight distribution and center of gravity can be found in Fig. 8.
Condensate Drains Ð The condensate drain connec- tion is a 1 1¤2-in. NPT pipe connection located on the right hand side of the unit. See Fig. 9.
NOTE: Use a trap of at least 7-in. deep.
Condenser Coil Shipping Covers Ð Remove and discard.
Install Outdoor Hoods
1.Outdoor-air hoods are shipped bolted to the unit in a ship- ping position. To open hoods, remove the 3 holddown bars holding the air hood in shipping position. See Fig. 10.
2.Lift up the highest hood top and swing out hood sides to form the outside frame of the air hood. Fasten hood top to hood sides at middle and top holes only, using two screws on 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 place and fasten to hood sides with screws provided using up- per hole only.
5.Swing up third hood (from the top of unit) into place and fasten to hood sides with screws provided using upper hole only.
6.Swing up fourth hood (bottom hood) into place. Before fastening hood to hood sides, swing down bottom ®lter rack. 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 ®lter track. Swing ®lter track into position and fasten to hood sides using screws provided. Repeat until all 4 ®lter racks have been installed.
9.Apply a bead of RTV or similar sealant to corner of each hood at pivot point to prevent water leaks.
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