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6
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 the minimum clearances required
for safety. This includes the clearance to combustible surfac-
es, unit performance 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.
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 (Na-
tional Fire Protection Association) 54 TIA–54–84–1. In Canada,
installation must be in accordance with the CAN1–B149 instal-
lation 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.
Locate mechanical draft system flue assembly at least 4 ft
(1.2 m) from any opening through which combustion prod-
ucts could enter the building, and at least 4 ft (1.2 m) from
any adjacent building (or per local code). Locate the flue as-
sembly 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 walk-
ways, 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 require-
ments. Refer to Install External Condensate Trap and Line on
page 15 for required trap dimensions.
C
B
A
D
LOCATION
DIMENSION
CONDITION
A
48 in. (1219 mm)
Unit disconnect is mounted on panel
18 in. (457 mm)
No disconnect, convenience outlet option
18 in. (457 mm)
Recommended service clearance
12 in. (305 mm)
Minimum clearance
B
40 in. (1067 mm)
Surface behind servicer is grounded (e.g., metal, masonry wall)
36 in. (914 mm)
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Special
Check sources of flue products within 10 ft (3 m) of unit fresh air intake hood
C
36 in. (914 mm)
Side condensate drain is used
18 in. (457 mm)
Minimum clearance
D
48 in. (1219 mm)
No flue discharge accessory installed, surface is combustible material
42 in. (1067 mm)
Surface behind servicer is grounded (e.g., metal, masonry wall)
36 in. (914 mm)
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass)
Special
Check for adjacent units or building fresh air intakes within 10 ft (3 m) of this unit’s flue outlet
Summary of Contents for WeatherMaker 48KC Series
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Page 5: ...5 Fig 2 Unit Dimensional Drawing cont ...
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Page 26: ...26 Fig 44 Typical 48KC 04 06 Power Wiring Diagram 208 230 3 60 Unit Shown ...