15
Installation Requirements
This fi tting 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
fi tting shall be installed so that its outlet
discharges above the spill-over level of
any fi xed appliance as indicated below:-
For backfl ow protection in domestic or
installations up to, and including, Fluid
Category 3.
If the fi tting 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
backfl ow 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 fi ttings
(other than a draining tap) at a lower level.
For backfl ow 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 fi tting, which ever is the
greater. If the fi tting cannot be installed
as indicated it shall be installed with a
backfl ow prevention arrangement suitable
for the Fluid Category.
Size of tap or
combination fi tting
Vertical distance
of outlet above
spill-over level
1.
Not exceeding ½” 20mm
2.
Exceeding ½”
but not
exceeding ¾”
25mm
3.
Exceeding ¾”
70mm
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