Initial installation – Enviro Westport C-10794 User Manual

Page 14

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Figure 11: Restrictor plate settings.

Initial Installation

QUALIFIED INSTALLERS ONLY

Figure 12. Possible Vent Configurations for Top Vented;

Vertical and Horizontal Terminations.

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

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.

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 re-tighten the bolt to secure in place.
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.