Roof Mount —
Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.
Table 1 – Operating Weights
548J*14D | UNITS LB (KG) | |
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Component | 14D | |
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Base Unit | 1370 | (620) |
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Economizer |
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Vertical | 100 | (45) |
Horizontal | 115 | (52) |
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Powered Outlet | 32 (15) | |
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Curb |
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180 | (82) | |
235 (107) | ||
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Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different sequences for the steps of unit installation. For example, on
Curb-mounted installation —
Install curb
Install
Install accessory
Prepare bottom condensate drain connection to suit planned condensate line routing (refer to Step 9 for details)
Rig and place unit Install outdoor air hood
Install condensate line trap and piping Make electrical connections
Install other accessories
Pad-mounted installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain connection plug
Rig and place unit
Convert unit to side duct connection arrangement Install
Install condensate line trap and piping Make electrical connections
Install other accessories
Frame-mounted installation —
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim with transportation agency.
Confirm before installation of unit that voltage, amperage and circuit protection requirements listed on unit data plate agree with power supply provided.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in Fig. 3. Assemble and install accessory roof curb in accordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 5. Improperly applied gasket can also result in air leaks and poor unit performance.
Curb should be level. This is necessary for unit drain to function properly. Unit leveling tolerances are show in Fig. 4. Refer to Accessory Roof Curb Installation Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit.
If electric and control wiring is to be routed through the basepan, attach the accessory
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of
6in. (150 mm) beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if required.
Alternate Unit Support (In Lieu of Curb or Slab Mount) —
A
548J*14D
5