10
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installa-
tion 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. This includes the clearance to
combustible surfaces, unit performance 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 ins talled directly on w oo d floo rin g or on Clas s
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
water from higher level runoff and overha ngs to fall onto
the unit.
Selec t a unit mounting system that provides adequate
height to allow for removal and disposal of frost and ice
that will form during the heating--defrost mode as well as
allow installation of c ondensate trap per requirement s.
RefertoStep9—InstallExternalCondensate Trap and
Line – for required trap dimensions.
Roof Mount —
Check building codes for weight distribution
requirements. Unit ope rating weight is shown in Table 4.
Table 4 – Operating Weights
549J*
UNITS LB (KG)
07 08 09
Base Unit 710 (322) 875 (397) 1020 (463)
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. / 356mm 110 (50) 110 (50) 110 (50)
24--- in. / 610mm 145 (66) 145 (66) 145 (66)
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequence s 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.
Revie w the following for recommended sequences for
installation steps.
Curb --Mounted Installation —
Install curb
Install field--fabricated ductwork inside curb
Install accessory thru--base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom conde nsate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and plac e 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 plac e unit
Convert unit to side duct connection arrangement
Install field--fabricated ductwork at unit duct ope nings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame--Mounted Installation —
Frame--mount ed 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.
On units with hinged panel option, check to be sure all
latches are snug and in closed position.
Loca te the carton containing the outside air hood parts;
see Fig. 12 (on page 14). Do not remove carton until unit
has been rigged and loca ted 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.
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 al so result in air leaks and poor unit
performance.
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