Bristan H64DMT2 Istruzioni per l'installazione e manuale d'uso - Pagina 8
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Installation Requirements
This fitting needs to be installed
in accordance with the following
Installation Requirements and Notes
(IRN) to ensure they meet the
requirements of the Water Supply
(Water Fittings) Regulations 1999
and the Scottish Byelaws 2004.
IRN R001: See text of entry for
Installation Requirements or Notes.
IRN R040 - Schedule 2-15 (1): The
fitting shall be installed so that its
outlet discharges above the spill-
over level of any fixed appliance as
indicated below:-
For backflow protection in domestic
or installations up to, and including,
Fluid Category 3.
If the fitting cannot be installed as
indicated in the table opposite it shall
be installed as either a or b below:
a: with an approved double check
valve assembly or some other no less
effective backflow prevention device
immediately upstream of the inlet.
b: so that it draws water by gravity
only from a cistern, or cylinder having
a permanently open vent pipe, and
the distributing pipe supplies no
other fittings (other than a draining
tap) at a lower level.
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For backflow protection in premises
or installations up to, and including
Fluid Category 5.
The vertical distance of the outlet
above the spill-over level shall be
not less than 20mm or twice the
diameter of the inlet pipe to the
fitting, which ever is the greater. If
the fitting cannot be installed as
indicated it shall be installed with a
backflow prevention arrangement
suitable for the Fluid Category.
Size of tap or
combination
fitting
1. Not exceeding
½"
2. Exceeding ½"
but not
exceeding ¾"
3. Exceeding ¾"
Vertical
distance
of outlet above
spill-over level
20mm
25mm
70mm