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LOCATION
DIMENSION
48 in. (1219 mm)
18 in. (457 mm)
A
18 in. (457 mm)
12 in. (305 mm)
40 in. (1067 mm)
B
36 in. (914 mm)
Special
36 in. (914 mm)
C
18 in. (457 mm)
48 in. (1219 mm)
42 in. (1067 mm)
D
36 in. (914 mm)
Special
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 —
for the unit and its support system (curb or other) that pro-
vides for the minimum clearances required for safety. This
includes the clearance to combustible surfaces, unit perfor-
mance and service access below, around and above unit as
specified in unit drawings. See Fig. 3.
NOTE: Consider also the effect of adjacent units.
Be sure that unit is installed such that snow will not
block the combustion intake or flue outlet.
Unit may be installed directly on wood flooring or on
Class A, B, or C roof-covering material when roof curb is
used.
C
B
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, fiberglass)
Check sources of flue products within 10 ft (3 m) 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)
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
Fig. 3 — Service Clearance Dimensional Drawing
Select a location
A
CONDITION
Do not install unit in an indoor location. Do not locate air
inlets 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 Combustion and Ventilation) of the National
Fuel Gas Code, ANSI Z223.1 (American National Stan-
dards Institute) and NFPA (National Fire Protection Associ-
ation) 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 per-
mit 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 eleva-
tion (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
6
D
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