Trane Gas Unit Heaters Wartungshandbuch

GUNE-SVX001A-EN

17 

Refer to specification table and installation manual for 
proper usage.

The following instructions apply to Canadian installations 
in addition to installation and operating instructions.

1.

Installation must conform with local building codes, or 
in the absence of local codes, with current CSA B149.1, 
Installation Codes for Natural Gas Burning Appliances 
and Equipment, or CSA B149.2, Installation Codes for 
Propane Gas Burning Appliances and Equipment.

2. Any reference to U. S. standards or codes in these 

instructions are to be ignored, and the applicable 
Canadian standards or codes applied.

Observe the following precautions when venting the unit: 

1.

Use flue pipe of the same size as the flue connections 
on the gas duct furnace (see 

). All heaters 

should be vented with UL Listed (UL 1738 in United 
States, UL S636 in Canada) double wall or single wall 
vent pipe, a factory built chimney, or a lined brick and 
mortar chimney that has been constructed in 
accordance with the National Building Code.

2. Provide as long a vertical run of flue pipe at the duct 

furnace as possible. A minimum of 5 feet (1.5 m) of 
vertical flue is required. The top of the vent pipe should 
extend at least 2 feet (0.61 m) above the highest point 
on the roof. Install a weather cap over the vent 
opening; cap should be a Breidert Type L or Fields 
Starkap vent cap. Consideration should be made for 
anticipated snow depth. See 

.

3. Slope horizontal runs upward from the duct furnace at 

least 1/4 inch per foot (21 mm/m) minimum. Horizontal 
runs should not exceed 75 percent of the vertical 
height of the vent pipe, or chimney, above the flue pipe 
connections, up to a maximum length of 10 feet (3 m). 
Horizontal portions of the venting system shall be 
supported at minimum intervals of 4 feet (1.2 m) in the 
United States, and at minimum intervals of 3 feet (1 m) 
in Canada. See 

.

4. Use as few elbows as possible.

5. Avoid running vent pipe through unheated spaces.

6. When this cannot be avoided, insulate the pipe to 

prevent condensation of moisture on the walls of the 
pipe.

7.

Do not damper the flue piping. Failure to open such 
damper prior to operating the duct furnace will result 
in the spillage of flue gas into the occupied space.

8. Avoid installing units in areas under negative pressure 

due to large exhaust fans or air conditioning. When 
required, a flue vent fan should be installed in 
accordance with the instructions included with the fan.

9. Vent connectors serving Category I and Category II 

heaters shall not be connected into any portion of 
mechanical draft systems operating under positive 
pressure.

Observe the following precautions when venting the unit: 

1.

Horizontal venting arrangements are designed to be 
used with single wall or double wall vent pipe. 
Horizontal venting arrangements must terminate 
external to the building using UL 1738 vent pipe in the 
United States. For installations in Canada, use vent 

Door, window, or gravity vent inlet; 
combustion air inlet for other appliances

9 in. for 10,000 to 50,000 Btu/h input; 

12 inches for input exceeding 50,000 Btu/h

9 inches (230mm) for 10,000 to 50,000 Btu/h input; 
12 inches (305mm) for input exceeding 50,000 Btu/h

Forced air inlet within 10 feet

3 feet above

6 feet (1.8 m)

Adjoining Building or parapet

10 feet

10 feet (3.04 m)

Adjacent public walkways

7 feet above grade

7 feet (2.1 m) above grade

Electric, gas meters & regulators

4 feet horizontal

3 feet (0.9 m) horizontally from meter/regulator 

assembly. 6 feet (1.8 m), any direction, from a gas 

service regulator vent outlet

Above grade level

(a)

1 foot

1 foot (0.3 m)

(a) Minimum above maximum snow depth, or per local code, whichever is greater.