Bristan Value VAC LBSM C NH Installation Instructions & User Manual - Page 5

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Bristan Value VAC LBSM C NH Installation Instructions & User Manual

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:

IRN R001: See text of entry for Installation

IRN R001:

Requirements or Notes.

IRN R010:

IRN R010: - - - - Schedule 2

Schedule 2– – – – 15 (1) :

Schedule 2

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

valve

backflow prevention device shall be fitted

immediately upstream of both hot and cold

water inlets.

IRN R040: - - - - Schedule 2

IRN R040:

Schedule 2

Schedule 2- - - - 15 (1):

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 a a a or b b b b below:

a: a: a: a: with an approved double check valve

assembly or some other no less

effective backflow prevention device

immediately upstream of the inlet.

b: b: b: 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.

15 (1) :

15 (1) : Water

15 (1) :

'Listed' single check

15 (1): The

15 (1):

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

2. 2. 2. 2. Exceeding 1/2 in

but not exceeding

3/4 in

3. 3. 3. 3. Exceeding 3/4 in

Vertical distance

of outlet above

spill

spill- - - - over level.

spill

over level.

20mm

25mm

70mm