7.7.
Attaching Air Restrictors
There are two types of restrictor supplied with each
#535 engine unit. One type is for installations with
horizontal vent termination and the other is for
installations with through-the-roof termination.
Figure 19 identifies them.
The restrictors cover part of the openings in the
firebox rear wall ports – See figure 20.
To fit the restrictors, remove the center screws
from the rear ports and fit the restrictors using
these screws. To set the restrictors at maximum
port opening, slacken the bottom screws in the
ports, slide the restrictors down as far as possible
and tighten the screws over the restrictors.
To set the restrictors at minimum port opening,
slide the restrictors up as far as possible and tighten
the screws.
7.7.1.
Installations with Horizontal Termination
Do not fit restrictors if the vertical rise is less than 3ft.
Do not fit restrictors if the horizontal run is more than 4ft.
For installations with a horizontal run of 4ft or less and having a
vertical rise of 3ft or more fit the restrictors at maximum port opening
position.See Graph 2.
On models 535 the horizontal type restrictors are never set at any
position except maximum port opening.
7.7.2.
Installations with Through-the-roof Termination
For vent heights up to 20ft. Fit the restrictors at
maximum
port
opening position.
For vent heights above 20ft Fit the restrictors at
minimum
port
opening position.
7.8.
Attaching Rear Ceramic Support
Fit the rear ceramic support to the firebox back panel with three
screws. See figure 21.
7.9.
Attaching to the Framing
Place the heater in position in the framing.
•
•
•
Secure the side support angles to the side studding through
two holes each side with the woodscrews supplied. The top
support angle should abut the cement board but is not fixed to the framing.
Check the wall finish requirements with the homeowner. If necessary, adjust the position of the heater so that the
distance from the front of the heater case to the angles is suitable for the thickness of the wall finish (e.g. tile, etc.) – see
figure 21a.
15 of 23
Figure 21a Adjustment for wall finish
Figure 21 Rear ceramic support
Figure 20 Restrictor fitting
Figure 19 Restrictor identification
Graph 2
