Bristan Opac TS1503 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.

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.

Need help? Give us a call on 0330 026 6273 and speak to one of our trained advisors.

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