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Installation Requirements
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 (1/2" Basin Taps, 3/4" Bath Taps, Basin Mixer, Bath Filler, Bath Shower Mixer)
See text of entry for Installation Requirements or Notes.
IRN R006 (1/2" Basin Taps, 3/4" Bath Taps, Basin Mixer, Bath Filler)
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 (Basin Mixer, Bath Filler, Bath Shower Mixer)
Water supplies shall be 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 (Bath Shower Mixer)
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.
1. 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
If the fitting cannot be installed as indicated in the table it shall be installed:
a) with an approved double check valve assembly or some other no less effective
backflow prevention device immediately upstream of the inlet; or
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 no 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.
2. Vertical distance of outlet above
spill-over level.
20mm
25mm
70mm
5
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