Initial Installation
QUALIFIED INSTALLERS ONLY
The ENVIRO WESTPORT has been designed with a built in restrictor plate. The restrictor is designed to enhance flame appearance when installing this unit with vertical chimneys as well as installations with longer horizontal vent applications. It does this by controlling the amount of air moving through the vent pipe.
Figure 12 shows the vent restrictor position required, relative to the length of vent pipe. Longer vertical vent lengths necessitate greater restriction; position
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1 is open and position 5 is maximum restriction (refer to Figure 11). To avoid injury, it is best to make this adjustment when the fireplace is cool or use welder’s gloves or oven mitts.
5 4 3
Figure 11: Restrictor plate settings.
1
2
NOTE: The total length of the vent pipes can not exceed 30 feet (9.14 m). Any combination of rise and run can be used as long as it lays within the shaded area (a total of three (3) 90° elbows or six (6) 45° elbows can be used). In addition to what is shown, if a 90° elbow is used in the horizontal plane, 3 feet (91.4 cm) must be subtracted from the allowable horizontal run (for each 45° elbow, 11⁄2 feet must be subtracted from the allowable horizontal
run).
To access vent restrictor remove the valve cover plate from the right rear corner of the unit by undoing the two fastening screws.
Loosen the 1⁄4” hex head bolt and adjust to the correct setting.
Slide the hex head bolt to the next setting and
The numbers in this chart represent the actual vent restrictor settings. Although the numbers do not appear on the unit use this as a guide to follow.
Undo the setscrew and adjust the restrictor to the correct setting.
Ensure that the setscrew is re tightened and the unit is checked for proper operation.
Wait for unit to warm up to operating temperature to ensure proper and clean burning unit.
Note: 0,0 in Figure 12 represents a 90˚ bend directly off the outlet of the unit, in all horizontal instances except when using Selkirk and having less than a 4 ft (1.22 m) rise and 8 ft (2.44 m) horizontal offset. In this case, a 1 foot (30.5 cm) rise must be added below the 90˚ bend.
Figure 12. Possible Vent Configurations for Top Vented;
Vertical and Horizontal Terminations.
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