Trane Gas Unit Heaters Installation Manual download pdf (Page 22)

Installation: Piping

22 GKND-SVX01B-EN

The location of the vent terminal must be in accordance

with the National Fuel Gas Code ANSI Z223.1 in the U.S. or

the National Gas Installation Code CAN/CGA-B149.1 or the

Propane Gas Installation Code CAN/CGA-149.2 in Canada.

Minimum clearance are as follows:

In Canada, a vent shall not terminate above a meter/

regulator assembly within 3 feet horizontally of the

vertical center line of the regulator nor within 6 feet of any

gas service regulator vent outlet.

Cut a hole through the wall for an 8-inch combustion air

pipe. Install thimble if required by local codes or type of

wall construction (see Figure 16, p. 22, Step 1).

Fasten a length of 5-inch pipe to the exhaust connection of

the concentric adapter with sheet metal screws. Use at

least three corrosion-resistant screws per joint. Seal all

joints with high temperature silicone sealant. The

concentric adapter box may be fastened directly to the wall

or spaced away from the wall using suitable brackets

(field-supplied). Before mounting the box, cut a length of

8-inch pipe so that it will protrude 2 inches through the

wall when the box is mounted in position. Fasten the

8-inch pipe to the combustion air inlet connection of the

concentric adapter and seal the joint. Add an additional 5-

inch pipe, if necessary, so that the base of the exhaust cap

will be 16 to 24 inches from the combustion air inlet (see

Figure 16, p. 22, Step 2).

Insert the pipes through the wall and fasten the adapter

box in place. Flash and/or caulk 8-inch pipe on outside wall

(see Figure 16, p. 22, Step 3).

Install the inlet air screen on the 8-inch pipe and fasten with

sheet metal screws. Install the flue terminal on the 5-inch

pipe and fasten in place (see Figure 16, p. 22, Step 4).

Connect the flue pipe and the combustion air pipe from the

concentric adapter to the unit. The pipe must be single wall

26-gauge or heavier galvanized steel or a material of

equivalent durability and corrosion resistance. The pipe

diameter must be listed under inlet and flue size in Table 1,

p. 10. The equivalent length of the exhaust vent pipe must

be a minimum of 5 feet and a maximum of 50 feet. The

equivalent length equals the total length of straight pipe

plus 15 feet for each 90-degree elbow and 5 feet for each

45-degree elbow. Secure each joint with a minimum of

three corrosion resistant screws. Seal all joints of the

exhaust vent pipe with two full turns of 3M #425

Aluminum Foil Tape or its equivalent suitable for 550°F or

high temperature silicone sealant. Seal all joints of the

combustion air inlet pipe with two full turns of duct tape or

aluminum foil tape or silicone sealant.

Vertical Termination

Select a location on the roof for the vent terminal, ensuring

adequate space inside for the concentric vent box. The

terminal must be at least 6 feet from any wall or adjoining

building (see Figure 17, p. 23).

Figure 15. Horizontal concentric venting

Table 5. Horizontal concentric venting—minimum

clearance

Object

Minimum Clearance

U.S. Canada

Forced air inlet within

10 feet

3 feet above 6 feet

Door, window or gravity

air inlet or combustion air

inlet for other appliance

4 feet below

4 feet horizontally

1 foot above

12 inches for

100,000 Btu/h input

or less. 3 feet for

input exceeding

100,000 Btu/h.

Adjacent public walkways 7 feet above grade 7 feet above grade

Above grade level 1 foot 1 foot

Size pipes

according to

Table 1, p. 10.

Figure 16. Horizontal concentric venting—installation

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 42 43

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Trane Gas Unit Heaters Installation Manual Page 22

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