Trane Horizon OABE/F Installation, Operation And Maintenance Manual page 44

Installation
Input ratings
Btu/h W
75000–149999 21980–43958
150000–400000 43960–117228
The total equivalent length of vent pipe must not exceed
50 ft (15.25 m). Equivalent length is the total length of
straight sections, plus 5 ft (1.52 m) for each 90° elbow and
2.5 ft (0.76 m) for each 45° elbow.
The vent system must also be installed to prevent
collection of condensate. Pitch horizontal pipe runs
downward 1/4 in./ft (21 mm/m) toward the outlet to permit
condensate drainage. Insulate vent pipe exposed to cold
air or routed through unheated areas. Insulate vent pipe
runs longer than 10 ft (3 m). Insulation should be a
minimum of 1/2 in. (12 mm) thick foil faced fiberglass of
1-1/2# density. Maintain 6 in. (152 mm) clearance between
vent pipe and combustible materials.
An approved Breidert Type L, Field Starkap or equivalent
vent cap must be provided. Vent cap inlet diameter must
be the same as the vent pipe diameter. The vent terminal
must be at least 12 in. (305 mm) from the exterior wall that
it passes through to prevent degradation of building
material by flue gases. The vent terminal must be located
at least 12 in. (305 mm) above grade, or in snow areas, at
least 3 ft (1 m) above snow line to prevent blockage.
Additionally, the vent terminal must be installed with a
minimum horizontal clearance of 4 ft (1.2 m) from electric
meters, gas meters, regulators or relief equipment.
Through-the-wall vents shall not terminate over public
walkways or over an area where condensate or vapor
could create a nuisance or hazard. Provide vent
termination clearances to building or structure features as
follows:
Structure
Door, window or gravity inlet
Forced air inlet within 10 ft (3 m)
Adjoining building or parapet
Adjacent public walkways
44
Diameter pipe to use
in. mm
5 126
6 152
Minimum Clearance
4 ft (1.2 m) below
4 ft (1.2 m) horizontally
1 ft (305 mm) above
3 ft (0.91 m) above
6 ft (1.8 m)
7 ft (2.1 m) above grade
Figure 56. Horizontal venting—category III
1 ft (305 mm) Min.
Approved
2 in. (51 mm) Fiberglass Insulation
Vent Terminal
3 ft (0.91 m) Min.
Above Highest Snowfall
5 ft (1.52 m) Min.
50 ft (15.25 m) Max.
Equivalent Length
2 in (51 mm) Clearance
Thimble with
Condensate Drain
With Trap, If Required
By Local Codes
Heating Appliance
OAU-SVX004D-EN