Trane Gas Unit Heaters Installation Manual download pdf (Page 19)

Installation: Piping

GLND-SVX01B-EN 19

Venting for Power Vented (Category III)

Duct Furnaces

All duct furnaces must be vented!

All venting installations shall be in accordance with the

latest edition of Part 7, venting of Equipment of the

National Fuel Gas Code, ANSI Z223.1, or applicable

provisions of local building codes for power vented units.

Also see p. 21 for additional Canadian installations.

Horizontal vent systems must be in compliance with UL

1738 for installations in the United States, and ULS636 for

installations in Canada.

Power vented units are designed to be used with single

wall vent pipe utilizing horizontal or vertical venting

arrangements. These arrangements must terminate

external to the building using either a single wall or

double wall vent. See Figure 11, p. 20 through Figure 19,

p. 24 for special installation requirements regarding these

venting conditions.

If double wall venting (other than Type B; see preceding

warning) is used, components which are UL Listed and

approved for Category III positive pressure venting

systems MUST be used.

A Briedart Type L, Field Starkap or an equivalent vent cap

must be supplied by the customer for each power vented

unit. The vent pipe diameter MUST be as specified in

Table 1, p. 9 (“D” Dia. Flue Opening). A reducer must be

field installed for 100 through 175 MBh Unit Sizes. All 300

through 400 MBh Unit sizes are factory equipped with the

required flue increaser. Refer to Figure 11, p. 20 through

Figure 19, p. 24 for additional requirements.

The venting system for these appliances shall terminate at

least four feet (1.2 m) below, four feet (1.2 m) horizontal

from, or one foot (0.3 m) above any door, window, or

gravity air inlet into any building.

Through the wall vents for these appliances shall NOT

terminate over public walkways, or over an area where

condensate or vapor could create a nuisance or hazard or

could be detrimental to the operation of regulators, relief

valves, or other equipment.

The vent pipe equivalent length must be five feet (1.5 m)

minimum and must not exceed 50 feet (15.2 m).

Equivalent length is the total length of straight sections

PLUS 15 feet (4.6 m) for each 90 degree elbow, eight feet

(2.4 m) for each 45 degree elbow, and 10 feet (3.0 m) for

the vent cap.

Maintain six inches (152 mm) between vent pipe and

combustible materials. A minimum of 12 inches (305 mm)

of straight pipe is required from the venter outlet before

installing an elbow in the vent system. Never attach an

elbow directly to the venter (see preceding warning).

Use single wall pipe constructed of 26 gauge galvanized

steel or material of equivalent durability and corrosion

resistance for the vent system. For installation in Canada,

use pipe constructed from 0.025-inch thick aluminum or

0.018-inch thick stainless steel.

Any run of single wall vent pipe passing through an

unheated space must be insulated with an insulation

suitable to 550°F.

WARNING

Carbon Monoxide!

Your venting system must not be blocked by any snow,

snow drifts, or any foreign matter. Inspect your venting

system to ensure adequate ventilation exists at all

times! A blocked venting system could result in carbon

monoxide poisoning. Symptoms of such condition

include grogginess, lethargy, inappropriate tiredness, or

flu-like symptoms. Failure to follow these

recommendations could result in death or serious

injury.

WARNING

Carbon Monoxide!

Your venting system must not be blocked by any snow,

snow drifts, or any foreign matter. Inspect your venting

system to ensure adequate ventilation exists at all

times! A blocked venting system could result in carbon

monoxide poisoning. Symptoms of such condition

include grogginess, lethargy, inappropriate tiredness,

or flu-like symptoms. Failure to follow these

recommendations could result in death or serious

injury.

WARNING

Risk of Fire and Carbon Monoxide

Poisoning with Improper Piping!

Never use a pipe of a diameter other than that specified

in Table 1, p. 9! To prevent pipe from melting and

introducing exhaust fumes into the air supply, never

use PVC, ABS or any other non-metallic pipe for

venting! To prevent fan restriction, an elbow should

never be attached directly to the venter. Failure to

follow recommendations could result in death or

serious injury or equipment damage.

WARNING

Risk of Carbon Monoxide Poisoning with

Type B Vent!

Do not use a type B double wall vent internally within

the building on power vented units! Type B vent does

not seal well under positive pressure and could result in

exhaust fume leaks. Failure to follow these

recommendations could result in death or serious

injury.

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Trane Gas Unit Heaters Installation Manual Page 19

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