21
21
Appliance Preparation
Rear Log Support Refi tting
Re
fi
t the rear log support in place (5 screws).
Adjustable
piece
Air Restrictor Assembly
Air Restrictors Fitting
No restrictors are required for appliances which only have a
horizontal vent run. If installing an appliance which has a rear vent
outlet connection and no vertical vent pipe rise, ignore this stage.
A restrictor set, shown right, is supplied with each 650 engine unit. The
restrictors cover part of the inlet air openings in the
fi
rebox rear wall
behind the rear log support.
The restrictor is assembled with an adjustable piece which can be moved
to different positions depending of the vent con
fi
guration. See the table
below to
fi
nd out which position is optimal for each type of installation.
• To
fi
t the restrictors, loosen the two center screws of the left and right
inlet ports. Place the restrictor assembly under the screw heads and
tighten the center screws.
• To set the adjustable restrictor piece, loosen the two screws, position the
adjustable piece according to the diagram below and tighten the screws.
Vent terminal
Appliance
vent outlet
Vertical vent
pipe run
Use restrictor
setting
Horizontal
through wall
with vertical
rise
Top
Less than
3’ (91 cm) to
6’ (183 cm)
From
6’ (1.83 m) to
20’ (6.1 m)
From
20’ (6.1 m) to
40’ (12.2 m)
Vent terminal
Appliance
vent outlet
Vertical vent
pipe run
Use restrictor
setting
Horizontal
through wall
with vertical
rise
Rear
Less than
3’6” (107 cm)
to 6’ (183 cm)
From
6’ (1.83 m) to
20’ (6.1 m)
From
20’ (6.1 m) to
40’ (12.2 m)
Vent terminal
Appliance
vent outlet
Vertical vent
pipe run
Use restrictor
setting
Vertical
through roof
Top or rear
Less than
20’ (6.1 m)
From
20’ (6.1 m) to
40’ (12.2 m)
