Bristan Pisa series Installationsanleitung & Benutzerhandbuch - Seite 5
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4. Installation Requirements & Notes
These fittings need 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 R006
This tap or combination tap assembly has a
Type AUK3 air gap and is therefore for
installation in any premises to protect
against a backflow risk up to a Fluid
Category 5.
IRN R010
Water supplies shall be a reasonably
balanced pressures from a common source
(e.g. hot and cold supplies both from the
same storage or both from a supply pipe).
Where the fitting is supplied from
unbalanced supplies (e.g. hot and cold
supplies from separate sources) a 'Listed'
single check valve or some other no less
effective backflow prevention device shall be
fitted immediately upstream of both hot and
cold water inlets.
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.
Schedule 2-15 (1)
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 fitting
(other than draining tap) at a lower level.
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 1/2
in
2. Exceeding 1/2 in
but not exceeding
3/4 in
3. Exceeding 3/4 in
Vertical distance
of outlet above
spill-over level.
20mm
25mm
70mm
05