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Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Locate mechanical draft system flue assembly at least 4 ft
(1.2 m) from any opening through which combustion
products could enter the building, and at least 4 ft (1.2 m)
from any adjacent building (or per local code). Locate the
flue assembly at least 10 ft (3.05 m) from an adjacent
unit's fresh air intake hood if within 3 ft (0.91 m) of same
elevation (or per local code). When unit is located
adjacent to public walkways, flue assembly must be at
least 7 ft (2.1 m) above grade.
Select a unit mounting system that provides adequate
height to allow installation of condensate trap per
requirements. Refer to Step 11 — Install External
Condensate Trap and Line – for required trap dimensions.
Roof mount —
Check
building
codes
requirements. Unit operating weight is shown in Table 1.
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 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 —
Install curb
Install field- - fabricated ductwork inside curb
Install thru- - base service connection fittings (affects
curb and unit)
Rig and place unit
Remove top skid
Install combustion air hood
Install flue hood
Install gas piping
Install condensate line trap and piping
Make electrical connections
Install other accessories
580J***D
Component
Base Unit
Economizer
Powered Outlet
Curb
14--- in/356 mm
24--- in/610 mm
for
weight
distribution
Table 1 – Operating Weights
17D
1824 (828)
245 (111)
32 (15)
243 (111)
315 (143)
Pad- - mounted installation —
Prepare pad and unit supports
Rig and place unit
Remove duct covers and top skid
Install field- - fabricated ductwork at unit duct openings
Install combustion air hood
Install flue hood
Install gas piping
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame- - mounted installation —
Frame- - mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific 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.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 5 (size 17 and 20 units) and Fig. 6 (size 24 and 28
units). 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 and Fig. 6. 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. 7. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
UNITS LB (KG)
20D
24D
1839 (835)
1989 (903)
245 (111)
245 (111)
32 (15)
32 (15)
243 (111)
273 (124)
315 (143)
350 (159)
7
28D
2118 (961)
245 (111)
32 (15)
273 (124)
350 (159)
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