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Installation

GUNE-SVX001A-EN

Additional Requirement for Canadian
Installations

Refer to specification table and installation manual for
proper usage.

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

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.

Vertically Vented Duct Furnaces
(Category III)

Observe the following precautions when venting the unit:

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

Table 1, p. 8

). 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

Figure 9, p. 19

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

Figure 9, p. 19

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.

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.

Horizontally Vented Duct Furnaces
(Category III)

Observe the following precautions when venting the unit:

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

Table 7.

Vent systems termination clearance requirements

Structure/Object

Minimum Clearance for Termination Locations

USA

CANADA

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