Carrier WeatherMaker 48TC A/B07 Series, Installation Instructions Manual

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Fig. 10 — Service Clearances — 48TC**08-16 Units
INSTALLATION
Installation of this unit at altitudes above 2000 ft (610 m) shall be
made in accordance with the Listed High Altitude Conversion Kit
available with this furnace.
L'installation de ce générateur de chaleur à des altitudes
supérieures à 2000 pi (610 m) doit être effectuée conformément
aux instructions accompagnant la trousse de conversion pour
haute altitude fournie avec cet appareil.
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. 2-10.
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 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 (Ameri -
can National Standards Institute) and NFPA (National Fire Protec -
tion 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.
For sizes 07-14 only, locate mechanical draft system flue assem -
bly at least 4 ft (1.2 m) from any opening through which combus -
tion products 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 in -
take hood if within 3 ft (0.91 m) of same elevation (or per local
code). When unit is located adjacent to public walkways, flue as -
sembly must be at least 7 ft (2.1 m) above grade.
Select a unit mounting system that provides adequate height to al -
low installation of condensate trap per requirements. See Install
External Condensate Trap and Line on page 30 for required trap
dimensions.
ROOF MOUNT
Check building codes for weight distribution requirements. Unit
operating weight is shown in Table 2.
C
B
A
D
NOTES:
1. Unit is not designed to have overhead obstruction. Contact Application Engineering for guidance on any application planning overhead obstruc-
tion or for vertical clearances.
2. See Fig. 4 for service clearances in units size 07.
LOCATION
DIMENSION
in. (mm)
CONDITION
A
48 (1219)
18 (457)
18 (457)
12 (305)
Unit disconnect is mounted on panel.
No disconnect, convenience outlet option.
Recommended service clearance.
Minimum clearance.
B
42 (1067)
36 (914)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall).
Surface behind servicer is electrically non-conductive (e.g., wood, fiberglass).
Check for sources of flue products within 10 ft of unit fresh air intake hood.
C
36 (914)
18 (457)
Side condensate drain is used.
Minimum clearance.
D
48 (1219)
42 (1067)
36 (914)
Special
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, fiberglass).
Check for adjacent units or building fresh air intakes within 10 ft (3 m) of this unit’s flue outlet.