6.5 Flue restrictor adjustment.
(See figure 10).
The appliance has an integral adjustable flue
draught restrictor. This is supplied set in the
fully open (unrestricted) position and in most
cases no adjustment should be necessary. It
can be reset to a fully restricted position if the
flue draught is excessive. The restrictor must
remain in its fully open position if the flue
has an equivalent height of 4m or less (as
calculated in accordance with BS5440: Part
1 Appendix A). Generally we recommend the
restrictor is NOT fitted where a precast flue
is used, however, certain flues may work
sufficiently to warrant its use. There may
however, be circumstances where fitting the
restrictor causes the fire to fail the spillage
test. In such cases the restrictor will have to
be re-opened. After opening conduct the
spillage check again.
To close the restrictor:
1. Loosen the screw situated behind the cut-out in the black upper heat shield. Do not
fully remove the screw.
2. Push the restrictor firmly down as far as it will go. The top of the slot in the
restrictor bracket should touch the screw.
3. Fully tighten the screw.
There may be certain circumstances where closing the restrictor causes the fire to fail
the spillage test (See section 9). In such cases the restrictor will have to be reopened.
Figure 10. Flue restrictor adjustment
INSTALLER GUIDE
© Baxi Heating U.K. Limited 2008.
Page 19
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