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The chimney or flue must have a cross-sectional area throughout its whole length that is
at least the area of flue outlet of the boiler and must be sealed to the boiler with fire clay
or other suitable compound.
The chimney or flue should be of sufficient height to provide draught of min. 25Pa
measured at the test hole in the top of the boiler. Draught conditions that are excessive,
measured at the test hole in the top cleaning door of the boiler, due to chimney height or
location should be controlled by means of the draught stabiliser fitted to the chimney to
ensure a draught of not more than 40 Pa exists. In some instances where the boiler is
located in exposed sites a second stabiliser may be required where natural draught
exceeds 40 Pa.
The newly developed design of the regulator makes it possible to install it on the flue
pipe in all possible positions, angled, vertically as well as horizontally. The regulator can
be fitted the short flue section supplied with the boiler. Possible leaks can easily be
sealed off with a gasket, putty or other suitable sealing substances.
Counterbalancing the flap
After installation the two screws should be loosened and the balance spindle should be
turned to a horizontal position when the flap is closed. Tighten screws.
Adjustment of Under-pressure
Adjustment of the under-pressure opening the flap is made by pressing the clamp on
which the weight is fitted and move it along the spindle. The under-pressure is changed
approx. 1 Pa every 2mm the weight is moved, see fig. 2. The values are approximate
and must be controlled with a draught indicator if exact under –pressure is required. The
flap is set at 25Pa on delivery.
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