Hot Water Connection Size And Location - Trane Horizon OABD Series Installation, Operation And Maintenance Manual

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Installation

All vent pipe joints must be sealed to prevent leakage. Follow

the instructions provided with the approved venting materials.

Vent pipe shall be sized as follows:

Input ratings

Btu/h

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

Figure 139. 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

Diameter pipe to use

in.

126

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

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

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