9
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National Elec-
trical Code) ANSI/NFPA 70 for special installation
requirements.
2. Determine unit location (from project plans) or select unit
location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb or
other) that provides for the minimum clearances required for
safety (including clearance to combustible surfaces), unit per-
formance and service access below, around and above unit as
specified in unit drawings. See Fig. 4.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class A,
B, or C roof-covering material when roof curb is used.
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, avoid locations that permit wa-
ter from higher level runoff and overhangs to fall onto unit.
Select a unit mounting system that provides adequate height to
allow installation of condensate trap per requirements. Refer to
Step 10 — Install External Condensate Trap and Line on page
14 for required trap dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements.
Unit operating weight is shown in Table 2.
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different se-
quences for the steps of unit installation. For example, on curb-
mounted units, some accessories must be installed on the unit
before the unit is placed on the curb. Review the following for
recommended sequences for installation steps:
CURB-MOUNTED INSTALLATION
1. Install curb.
2. Install field-fabricated ductwork inside curb.
3. Install accessory thru-base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details).
4. Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 10 — Install
External Condensate Trap and Line on page 14 for
details).
5. Rig and place unit.
6. Install outdoor air hood.
7. Install condensate line trap and piping.
8. Make electrical connections.
9. Install other accessories.
PAD-MOUNTED INSTALLATION
1. Prepare pad and unit supports.
2. Check and tighten the bottom condensate drain connection
plug.
3. Rig and place unit.
4. Convert unit to side duct connection arrangement.
5. Install field-fabricated ductwork at unit duct openings.
6. Install outdoor air hood.
7. Install condensate line trap and piping.
8. Make electrical connections.
9. Install other accessories.
FRAME-MOUNTED INSTALLATION
Frame-mounted applications generally follow the sequence for
a curb installation. Adapt the sequence as required to suit spe-
cific installation plan.
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.
On units with hinged panel option, check to be sure all latches
are snug and in closed position.
Locate the carton containing the outside air hood parts. Do not
remove carton until unit has been rigged and located in final
position.
Step 4 — Provide Unit Support
ROOF CURB MOUNT
Accessory roof curb details and dimensions are shown in
Fig. 7. Assemble and install accessory roof curb in accordance
with instructions shipped with the curb.
Curb should be level. This is necessary for unit drain to func-
tion properly. Unit leveling tolerances are shown in Fig. 8. Re-
fer to Accessory Roof Curb Installation Instructions for addi-
tional 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. The accessory thru-the-base power connection package
must be installed before the unit is set on the roof curb.
If electric and control wiring is to be routed through the basepan,
attach the accessory thru-the-base service connections to the base-
pan in accordance with the accessory installation instructions.
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. 7. Improperly applied gasket can also result in air leaks and
poor unit performance.
SLAB MOUNT (HORIZONTAL UNITS ONLY)
Provide a level concrete slab that extends a minimum of 6 in.
(150 mm) beyond unit cabinet. Install a gravel apron in front of
condenser coil air inlet to prevent grass and foliage from ob-
structing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
Table 2 — Operating Weights
549J
UNIT lb (kg)
04
05
06
Base Unit
495 (225)
580 (263)
610 (277)
Economizer
Vertical
80 (36)
80 (36)
80 (36)
Horizontal
105 (48)
105 (48)
105 (48)
Powered Outlet
32 (15)
32 (15)
32 (15)
Curb
14-in. (356 mm)
110 (50)
110 (50)
110 (50)
24-in. (610 mm)
145 (66)
145 (66)
145 (66)
Summary of Contents for Preferred 549J 04
Page 4: ...4 Fig 2 549J 04 06 Units Built On and After 4 15 2019...
Page 5: ...5 Fig 3 549J 04 06 Units Built Prior to 4 15 2019...
Page 6: ...6 Fig 4 549J 04 06 Corner Weights and Clearances...
Page 7: ...7 Fig 5 549J 04 06 Base Rail Details...
Page 8: ...8 Fig 6 549J 04 06 Thru the Base Charts...
Page 23: ...23 Fig 41 Electro Mechanical Control Wiring 208 230v 460v...
Page 24: ...24 Fig 42 Electro Mechanical Control Wiring 575v...
Page 25: ...25 Fig 43 Electro Mechanical Power Wiring 208 230 1 60...
Page 26: ...26 Fig 44 Electro Mechanical Power Wiring 208 230 3 60...
Page 27: ...27 Fig 45 Electro Mechanical Power Wiring 460 3 60...
Page 28: ...28 Fig 46 Electro Mechanical Power Wiring 575 3 60...
