Carrier EK, 48EJ, EW, EY024-048 installation instructions Field Fabricate Ductwork, Instructions on

ALTERNATE UNIT SUPPORT Ð When the preferred curb or slab mount cannot be used, support unit with sleepers on perimeter, using unit curb support area. If sleepers cannot be used, support long sides of unit (refer to Fig. 3-6) with a minimum number of 4-in. x 4-in. pads spaced as follows: 48EJ,EK,EW,EY024-034 units require 3 pads on each side; 48EJ,EK,EW,EY038-048 units require 4 pads on each side. Unit may sag if supported by corners only.

Step 2 Ð Rig and Place Unit Ð Inspect unit for trans- portation damage. File any claim with transportation agency.

Do not drop unit; keep upright. Use spreader bars over unit to prevent sling or cable damage. Level by using unit frame as a reference; leveling tolerance is shown in Fig. 1 and 2. See Fig. 7 for additional information. Unit operating weight is shown in Table 1.

NOTE: On retro®t jobs, ductwork may be attached to old unit instead of roof curb. Be careful not to damage ductwork when removing old unit. Attach existing ductwork to roof curb instead of unit.

Four lifting lugs are provided on the unit base rails as shown in Fig. 7. Refer to rigging instructions on unit.

POSITIONING Ð Maintain clearance, per Fig. 3-6, around and above unit to provide minimum distance from combus- tible materials, proper air¯ow, and service access.

Do not install unit in an indoor location. Do not locate unit air inlets near exhaust vents or other sources of con- taminated air. For proper unit operation, adequate combus- tion and ventilation air must be provided in accordance with Section 5.3 (Air for Combustion and Ventilation) of the National Fuel Gas Code, ANSI Z223.1 (American National Standards Institute).

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

Locate mechanical draft system ¯ue assembly at least

4 ft from any opening through which combustion products could enter the building, and at least 4 ft from any adjacent building. When unit is located adjacent to public walkways, ¯ue assembly must be at least 7 ft above grade.

ROOF MOUNT Ð Check building codes for weight distri- bution requirements. Unit weight is shown in Table 1.

Step 3 Ð Field Fabricate Ductwork

48EJ,EK UNITS Ð Field-fabricated ductwork should be at- tached to the roof curb. Supply and return duct dimensions are shown in Fig. 3 and 4. Air distribution is shown in Fig. 8.

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 the duct.

Secure all ducts to the building structure, using ¯exible duct connectors between roof curb and ducts as required. Ducts passing through an unoccupied 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 the unit is equipped with power exhaust.

For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install 90 de- gree elbow turns in the supply and return ductwork be- tween 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 falling into the conditioned space.

48EW,EY UNITS Ð Remove shipping covers from supply and return air openings. Attach ®eld-supplied ductwork to unit. Use a single duct over both return openings and a single duct over both supply openings. See Fig. 5 and 6 for duct opening dimensions. Secure all ducts to the building struc- ture. See Fig. 9. Use ¯exible duct connectors between unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and building openings with counter ¯ash- ing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

Install accesssory barometric relief or power exhaust in the ®eld-fabricated return ductwork. Refer to Position Power Exhaust/Barometric Relief Damper Hood section on page 26 for more information.

Instructions continued on page 12.

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