
Installation Requirements
These fittings need to be installed in
These fittings need to be installed in These fittings need to be installed in
These fittings need to be installed in
accordance with the following Installation
accordance with the following Installation accordance with the following Installation
accordance with the following Installation
Requirements and Notes (IRN) to ensure
Requirements and Notes (IRN) to ensure Requirements and Notes (IRN) to ensure
Requirements and Notes (IRN) to ensure
they meet the requirements of the Water
they meet the requirements of the Water they meet the requirements of the Water
they meet the requirements of the Water
Su ly (Water Fittings) Regulations 1999
Su ly (Water Fittings) Regulations 1999 Su ly (Water Fittings) Regulations 1999
Su ly (Water Fittings) Regulations 1999
and the Scottish Byelaws 2004.
and the Scottish Byelaws 2004.and the Scottish Byelaws 2004.
and the Scottish Byelaws 2004.
IRN R001:
IRN R001: IRN R001:
IRN R001: See text of entry for Installation
Requirements or Notes.
IRN R040
IRN R040 IRN R040
IRN R040 -
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- Schedule 2
Schedule 2Schedule 2
Schedule 2-
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-15 (1):
15 (1): 15 (1):
15 (1): The
fitting shall be installed so that its outlet
discharges above the s ill-over level of
any fixed a liance as indicated below:-
For backflow rotection in domestic or
For backflow rotection in domestic or For backflow rotection in domestic or
For backflow rotection in domestic or
installations u to, and including, Fluid
installations u to, and including, Fluid installations u to, and including, Fluid
installations u to, and including, Fluid
Category 3.
Category 3.Category 3.
Category 3.
If the fitting cannot be installed as
indicated in the table o osite it shall be
installed as either a
a a
a or b
bb
b below:
a:
a: a:
a: with an a roved double check valve
assembly or some other no less
effective backflow revention device
immediately u stream of the inlet.
b:
b: b:
b: so that it draws water by gravity only
from a cistern, or cylinder having a
ermanently o en vent i e, and the
distributing i e su lies no other fitting
(other than draining ta ) at a lower level.
For backflow rotection in remises or
For backflow rotection in remises or For backflow rotection in remises or
For backflow rotection in remises or
installations u to, and including Fluid
installations u to, and including Fluid installations u to, and including Fluid
installations u to, and including Fluid
Category 5.
Category 5.Category 5.
Category 5.
The vertical distance of the outlet above
the s ill-over level shall be not less than
20mm or twice the diameter of the inlet
i e to the fitting, which ever is the
greater. If the fitting cannot be installed
as indicated it shall be installed with a
backflow revention arrangement
suitable for the Fluid Category.
Size of ta or
Size of ta or Size of ta or
Size of ta or
combination fitting.
combination fitting.combination fitting.
combination fitting.
Vertical distance
Vertical distance Vertical distance
Vertical distance
of outlet above
of outlet above of outlet above
of outlet above
s ill
s ills ill
s ill-
--
-over level.
over level.over level.
over level.
1.
1.1.
1. Not exceeding 1/2
in 20mm
2.
2.2.
2. Exceeding 1/2 in
but not exceeding
3/4 in
25mm
3.
3.3.
3. Exceeding 3/4 in 70mm
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