INSTALLATION
Step 1 — Provide Unit Support
Roof Curb
Assemble or install accessory roof curb in accordance with instructions shipped with this accessory. (See Fig. 1.) Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be installed to roof curb before unit is set in place. Ductwork must be attached to curb and not to the unit. Curb must be level. This is necessary to permit unit drain to function properly. Unit leveling tolerance is
IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket with the roof curb as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit performance. Do not slide unit to position on roof curb.
Alternate Unit Support
When a curb cannot be used, install unit on a noncombustible surface. Support unit with sleepers, using unit curb support area. If sleepers cannot be used, support long sides of unit with a minimum of 3 equally spaced
Step 2 — Rig and Place Unit
Inspect unit for transportation damage. See Table 1 for physical data. File any claim with transportation agency.
!CAUTION
PERSONAL INJURY AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roof.
All panels must be in place when rigging. Unit is not designed for handling by fork truck.
Do not drop unit; keep upright. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit rail as a reference; leveling tolerance is ±
Rigging holes are provided in the unit base rails as shown in Fig. 3. Refer to rigging instructions on unit.
Positioning
Maintain clearance, per Fig. 2, around and above unit to provide minimum distance from combustible materials, proper airflow, and service access. See Fig. 4 for location of access panels.
Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, guard against water from higher level runoff and overhangs.
After unit is in position, remove crating and polyethylene sheet.
Roof Mount
Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.
Installation Onto Curb
The 50PG units are designed to fit on the accessory full perimeter curb. In either case, correct placement of the unit onto the curb is critical to operating performance. To aid in correct positioning, place unit on roof curb to maintain
NOTE: Before positioning unit onto curb, refer to Step 5 - Install External Trap for Condensate Drain section concerning bottom drain connection plug.
!CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Do not slide unit to position when it is sitting on the curb. Curb gasketing material may be damaged and leaks may result.
Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of
NOTE: Horizontal units may be installed on a roof curb if required.
CAUTION- NOTICE TO RIGGERS:
ACCESS PANEL MUST BE IN PLACE WHEN RIGGING.
Hook rigging shackles through holes in base rail, as shown in Detail A. Holes in base rails are centered around the unit center of gravity. Use wooden top skid, when rigging, to prevent rigging straps from damaging unit.
| UNIT |
|
| A |
|
| B | C |
|
| D |
| E | MAX. WEIGHT | ||||||||
| SIZE |
| in. |
| mm | in. |
| mm | in. |
| mm | in. |
| mm | in. | mm | lb | kg |
| |||
|
| 77.9 |
| 1978 |
| 44.8 |
| 1139 | 42.0 |
| 1067 | 23.5 | 597 | 1156 | 525 |
| ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
C07270
Fig. 3 - 50PG Rigging Label
4
