6
NOTE: Unit not designed to have overhead obstruction. Contact
Application Engineering for guidance on any application planning
overhead obstruction or for vertical clearances.
Fig. 3 — Service Clearance Dimensional Drawing
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 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 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. 3.
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
water 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. Re-
fer to Step 10 — Install External Condensate Trap and Line –
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
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 fol-
lowing for recommended sequences for installation steps.
LOCATION DIMENSION CONDITION
A
48-in. (1219 mm)
18-in. (457 mm)
18-in. (457) mm
12-in. (305 mm)
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
B
42-in. (1067 mm)
36-in. (914 mm)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Check sources of flue products within 10-ft of unit fresh air intake hood
C
36-in. (914 mm)
18-in. (457 mm)
Side condensate drain is used
Minimum clearance
D
42-in. (1067 mm)
36-in. (914 mm)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Check for adjacent units or building fresh air intakes within 10-ft (3 m) of this unit’s flue outlet
C
B
A
D
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