20
7.8.
Attaching Air Restrictors
No restrictors are required for appliances,
which only have a horizontal vent, run. If
installing an appliance which has rear vent
outlet connection and no vertical vent pipe
rise, ignore this stage.
There are three types of restrictor supplied
with each #534 engine unit. They are
identified in figure 28.
Type “A” is for horizontal vent termination.
Types “B” & “C” are for through-the-roof
termination.
The restrictors cover part of the openings in
the firebox rear wall ports – See figure 29.
The correct restrictors to be fitted for each
type of installation are shown in the table
below.
Vent
terminal
Appliance
vent outlet
Vertical
vent
pipe
run
Use
restrictor
type
Port
opening
set at
Less than 3ft
(91cm)
A Maximum
Top
From 3ft
(91cm) to 6ft
(183cm)
A Minimum
Less than 3ft
6” (107cm)
A Maximum
Horizontal
through wall
Rear
From 3ft 6”
(107cm) to
6ft (183cm)
A Minimum
Less than
20ft (6.1m)
B
Vertical
through roof
Top or rear
From 20ft
(6.1m) to
40ft (12.2m)
C
Not
applicable
To fit type “A” 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.
To fit types “B” or “C” restrictors remove the top and bottom
screws from the rear ports and fit the restrictors using these
screws.
Figure 29 Restrictor locations
Figure 28 Restrictor identification
Содержание 534AN
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