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Attaching Air Restrictors—Appliances with Vertical Vent Rise Only
No restrictors are required for appliances which only have a horizontal vent run.
Restrictors for co-linear applications are the same as required for co-axial of same
height—see table below.
There are three types of restrictors supplied with each #530 engine unit. They are
slightly different in size. They can be identified by the number printed on them.
The restrictors cover part of the openings in the firebox rear wall ports.
Each restrictor can be fitted at either Maximum or Minimum port opening.
Types 1, 2 and 3 are supplied with ceramic log appliances.
Types 4, 5, and 6 are supplied with ceramic coal appliances.
The correct restrictors to be fitted for each type of installation are shown in the table
below.
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.
With the largest restrictors, the upper screws may need to be slackened to allow
the restrictors to go under the screw heads.
•
•
•
•
•
•
•
1, 2, ...etc.
Restrictor
identification
marks
Vent terminal Vertical vent
pipe run
Use restrictor
type
Port opening
Set at
Logs
Coals
Horizontal
through wall
(with vertical
rise)
Less than ’
(61 cm)
1
Maximum
From ’
(61 cm) but
less than ’
(122 cm)
1
Minimum
From ’
(122 cm) but
less than ’
(183 cm)
Maximum
6’ (183 cm) or
more
Minimum
Vertical
through roof
Less than 1’
(396 cm)
Maximum
13’ (396 cm)
or more
Minimum
Maximum opening
Minimum opening
Air Restrictors Installation
