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LOCATION
A
B
C
D
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead
obstruction or for vertical clearances.
Fig. 4 — Service Clearance Dimensional Drawing — Sizes 07-12
INSTALLATION
Complete the following checks before
Jobsite Survey —
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 in-
terfere with unit lifting or rigging.
Step 1 — Plan for Unit Location —
tion for the unit and its support system (curb or other) that pro-
vides for the minimum clearances required for safety. This in-
cludes the clearance to combustible surfaces, unit performance
and service access below, around and above unit as specified in
unit drawings. See Fig. 4.
C
B
DIMENSION
48-in. (1219 mm)
18-in. (457 mm)
18-in. (457) mm
12-in. (305 mm)
42-in. (1067 mm)
36-in. (914 mm)
Special
36-in. (914 mm)
18-in. (457 mm)
48-in. (1219 mm)
42-in. (1067 mm)
36-in. (914 mm)
Special
Select a loca-
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non-conductive (e.g., wood, fiber-
glass)
Check sources of flue products within 10-ft of unit fresh air intake hood
Side condensate drain is used
Minimum clearance
No flue discharge accessory installed, surface is combustible material
Surface behind servicer is grounded (e.g., metal, masonry wall, another
unit)
Surface behind servicer is electrically non-conductive (e.g., wood, fiber-
glass)
Check for adjacent units or building fresh air intakes within 10-ft (3 m) of this
unit's flue outlet
NOTE: Consider also the effect of adjacent units.
Be sure that the unit is installed such that snow will not
block the combustion intake or flute outlet.
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 in-
lets near exhaust vents or other sources of contaminated air. For
proper unit operation, adequate combustion and ventilation air
must be provided in accordance with Section 5.3 (Air for Com-
bustion and Ventilation) of the National Fuel Gas Code, ANSI
Z223.1 (American National Standards Institute) and NFPA
(National Fire Protection Association) 54 TIA-54-84-1. In
Canada, installation must be in accordance with the CAN1-
B149 installation codes for gas burning appliances.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto the
unit.
8
D
A
CONDITION
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