Installation Requirement Notes (IRNs)

Installation requirement notes detail the installation and other requirements that apply to products as a condition of their WRAS product approval and are identified both in the directory listing and the approval documentation of an approval. An approval will only be valid if the requirements of the IRN are followed.

Such conditions are a requirement of the WRAS Approvals scheme imposed as part of the certification process; installing water fittings in accordance with such requirements does not guarantee compliance with the water fittings regulations. For this reason, WRAS cannot guarantee that enforcement action will not be taken by water companies under the water fittings regulations, or that the courts will hold that your product is compliant in this regard even where an installation and requirement note is adhered to.”

WRAS, accordingly, accepts no liability for loss of goodwill, business, revenue or profits, anticipated savings or wasted expenditure (whether reasonably foreseeable or not) or indirect or consequential loss arising from or in connection with the WRAS installation and requirement notes.

No reliance should be placed on an IRN as evidence that a product complies with the requirements of the water fittings regulations. We further refer you to the limitations of our liability in connection with the WRAS Approvals scheme.

 

IRN R001

See text of entry for Installation Requirements or Notes.

IRN R005

This tap or combination tap assembly has a Type AUK2 air gap and is therefore only suitable for installation in domestic premises or in other premises to protect against a backflow risk up to a Fluid Category 3, unless additional backflow protection for the higher risk is included in the
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IRN R006

If this tap or combination tap is installed so that its base is no lower than the spillover level of the receiving vessel (for example, a sink or washbasin), a Type AUK3 air gap is achieved which permits installation of the tap in any premises where backflow protection up to Fluid Category 5 is
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IRN R007

Connecting hoses to be installed where light is excluded.

IRN R008

This fitting is to be installed where light is excluded.

IRN R009

Inlet supply hoses to be installed where light is excluded

IRN R010

Water supplies shall be at 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) an ‘Approved’
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IRN R011

This combination tap assembly is not considered a bi-flow tap as the hot & cold water mixes as it discharges to atmosphere from the spout, therefore IRN R010 applies.
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IRN R012

This product is to be installed in the vertical orientation.

IRN R020

Multiple inlet fittings installed in domestic premises and supplied from unbalanced supplies (e/g hot and cold supplies from separate sources) shall be installed in accordance with IRN R010 and with a double check valve or some other no less effective backflow prevention device fitted at the
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IRN R030

Multiple inlet fittings installed to protect against a backflow risk up to a Fluid Category 3, incorporating a self-cancelling diverter acceptable as a backflow prevention device (HC) and having an AUK2 or AUK3 air gap, shall be installed in accordance with IRN R010 . Multiple inlet fittings
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IRN R040

Schedule 2-15 (1) The fitting, or outlet supplied by 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 premises or installations up to, and including, Fluid Category 3.
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IRN R050

Taps and combination fittings discharging in a non-domestic location and any appliances in premises where a higher level of protection is required, such as appliances in hospitals or other health care premises require a Type AUK3 tap gap.

IRN R060

Where in existing house installations a hose pipe is to be used from an existing hose union tap located outside a house and which is not provided with backflow protection, either: a. the existing hose union tap should be provided with a double check valve (Type EC or ED) located inside the
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IRN R070

The Water Supply (Water Fittings) Regulations 1999, the Water Supply (Water Fittings) Regulations (Northern Ireland) 2009, and the Water Supply (Water Fittings) (scotland) Byelaws 2014, preclude the connection of rim feed or ascending spray type bidets or bidets with hand - held spray attachments
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IRN R075

Schedule 2.25(4) (4) The requirement in sub-paragraph (1)(i) of Schedule 2.25(4) shall be deemed to be satisfied if, (a) in the case of an automatically operated flushing cistern servicing urinals which is filled with water at a rate not exceeding – (i) 10 litres per hour for a cistern
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IRN R080

Fittings incorporating fluid category 3 backflow protection shall be supplied by gravity from a cistern having family ‘A’ backflow protection by means of a distributing pipe which does not supply any other fittings at a lower level.

IRN R090

Supply(ies) shall be via fluid category 5 backflow protection or by gravity from a cistern incorporating family ‘A’ backflow protection by distributing pipe(s) to which no fittings for other purposes are connected.

IRN R100

Supply(ies) shall be from storage.

IRN R110

For above ground use, cold water services only, unless indicated otherwise in the description of entry.

IRN R111

Must be installed and maintained in accordance with BS 8551:2015.

IRN R120

The fitting is to be so installed as to be readily accessible for examination, test, maintenance, replacement or operation.

IRN R130

All outlet connections to cisterns, which are arranged to receive thermal expansion water, shall be fitted both internally and externally with suitably protected support washers.

IRN R140

Sealed primary circuits and /or secondary hot water systems shall incorporate a means for accommodating the thermal expansion of water to prevent any discharge from the circuit and/or system except in an emergency situation.

IRN R150

An ‘Approved’ single check valve or some other no less effective backflow prevention device providing backflow prevention protection to at least fluid category two shall be fitted at the point of connection(s) between the water supply and the fitting or appliance.
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IRN R155

An ‘Approved’ single check valve must be fitted as close as possible to the T-off supplying the device.

IRN R160

A compliant double check valve or some other no less effective device providing backflow prevention protection to at least fluid category three shall be fitted at the point of connection(s) between the water supply and the fitting or appliance. Where the double check valve is for use with products
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IRN R165

Where the DC pipe interrupter is used, it must be installed so that the lowest point of the air aperture is not less than 150mm above the spillover level of the receiving receptacle, and have no valve, flow restrictor or tap on its outlet.

IRN R170

Water Undertakers cannot be responsible for the quality of water passed from these fittings.

IRN R171

Schedule 2-15 (1) Water Undertakers cannot be responsible for the quality of ice passed from these fittings.
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IRN R190

The supply to the storage cistern shall be discharged via a Type AA air gap.

IRN R200

For closed circuit use only.

IRN R210

The supply to this fitting/appliance shall be by means of a metered supply only.

IRN R220

Solder alloys containing lead shall not be used in connection with systems which convey or receive water supplied for domestic purposes.

IRN R230

Where installed for domestic purposes in commercial premises, or elsewhere with the written consent of the undertakers, the fitting shall be installed with a backflow prevention device adequate for the class of risk.

IRN R240

This cistern is not suitable for storing water for domestic purposes.

IRN R250

No vent, warning or overflow pipe from a primary feed cistern shall convey water to any cistern supplying water to a secondary system from which water may be drawn for domestic purposes.

IRN R260

The fitting is not suitable for conveying hot water.

IRN R270

Every storage cistern, except one supplying water to the primary circuit of a heating system, shall be fitted with a servicing valve on the outlet pipe (s).

IRN R280

A servicing valve shall be installed on the supply to the fitting in a readily accessible location.

IRN R290

Schedule 2: 26 & 27 In accordance with schedule 2 paragraph 27 of the Water Supply (Water Fittings) Regulations 1999 in England and Wales, the Water Supply (Water Fittings) Regulations (Northern Ireland) 2009, and the Water Supply (Water Fittings) (Scotland) Byelaws 2014, a drinking water tap
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IRN R300

In some water supply areas it is advisable that copper cylinders and tanks be fitted with aluminium protector rods to promote resistance to corrosion. For further guidance consult your local water undertaker.

IRN R310

In some water supply areas require aluminium covers to be protected by a ‘Approved’ paint or lacquer. For further guidance consult your local water undertaker

IRN R320

In some areas of water supply only galvanised Grade A mild steel cisterns will be accepted. For further guidance consult your local water undertaker

IRN R330

In some water supply areas galvanising is required to be coated with a ‘Approved’ protective paint. For further guidance consult your local water undertaker

IRN R340

In some water supply areas galvanising is not accepted as a suitable means of internal protection for fittings. For further guidance consult your local water undertaker

IRN R350

Float-controlled valves or equivalent inlet devices should be securely and rigidly attached to the cistern and installed so that the valve closes when the level of the water is not less than 25 mm below the overflowing level of the cistern. Where the cistern is fitted with an approved alternative
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IRN R360

Domestic unvented primary circuits may be filled or replenished by means of a temporary connection between the primary circuit and the supply pipe. An ‘Approved’ double check valve shall be installed at the point of connection to the supply pipe. A permanent connection between the
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IRN R365

This has been withdrawn as of November 2015.

IRN R370

All fittings manufactured from duplex (alpha-beta) brass are unacceptable for underground use, for backflow prevention devices and for certain products specified by the water undertaker

IRN R380

Transient pressures may be evident from noise generated within the system as ‘water hammer’ - emanating from pipes as a result of rapid closure of a draw off tap or from rapid oscillation of a float operated valve.

IRN R390

An inlet strainer or line strainer shall be provided at the inlet.

IRN R400

Where a pressure flushing valve is connected to a supply pipe or distributing pipe, the flushing arrangement shall incorporate a backflow prevention device consisting of a permanently vented pipe interrupter located not less than 300mm above the spillover level of the WC pan.
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IRN R410

1. Every water closet pan shall be supplied with water from a flushing cistern, pressure flushing cistern or pressure flushing valve, and shall be so made and installed that after normal use its contents can be cleared effectively by a single flush of water, or where the installation is designed
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IRN R415

Notification should be given in writing of the proposed installation of this fitting to the local Water Supplier prior to its installation. The fitting shall not be installed until consent is given by the Water Supplier in line with Regulation 5 of the Water Supply (Water Fittings) Regulations 1999
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IRN R425

Having obtained consent from the water supplier for the installation of a BA device (RPZ valve) as required by Regulation 5 of the Water Supply (Water Fittings) Regulations 1999; the installation of the BA device (RPZ valve) and any associated fittings must be installed in accordance with the water
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IRN R430

All water fittings located outside the thermal envelope, or those outside the building should be located and installed in such a manner that will ensure protection from freezing, undue warming or damage by other means.

IRN R435

When this appliance is fitted externally, the outlet of the tap should be protected against damage and contamination from environmental factors (pathogens).

IRN R440

Supply(ies) shall be from storage, unless with the undertaker’s consent.

IRN R450

This machine has not been tested to the consumption requirements of the regulations and therefore it may not be suitable for installation for domestic use.

IRN R460

This appliance does not incorporate backflow protection. A site specific risk assessment will be required to determine the level of backflow protection required.

IRN R461

This inlet valve is not suitable to be used as part of a recognised backflow prevention arrangement, as it cannot conform with the regulators’ specification for backflow.

IRN R470

This machine has in built backflow protection to fluid category 3 but where installation may have a higher degree of risk an assessment may be undertaken and IGN 9-04-01 applied.

IRN R480

This machine has in built backflow protection to fluid category 4 but where installation may have a higher degree of risk an assessment may be undertaken and IGN 9-04-01 applied.

IRN R490

Because this WC cistern incorporates an internal warning pipe discharging into the WC pan and a float operated inlet valve of a compact type, an inlet or in-line strainer must be fitted up-stream of the valve.

IRN R500

Cold water feed tank not be used to supply other fittings

IRN R510

This unit must discharge via a backflow protection device which gives fluid category 5 protection, for example a type AA or AB air gap or an air break to drain that complies with BS EN 1717

IRN R511

The discharge from the drain valve must be via a backflow protection device which gives fluid category 5 protection, for example a type AA or AB air gap or an air break to drain that complies with BS EN 1717.

IRN R515

Where a flexible hose assembly installed upstream of a terminal fitting, (tap, valve, pipework etc.) is intended to accommodate repeated movement of the terminal fitting, it shall be installed so as to minimise any stress that may cause premature wear or failure of the hose due to either the
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IRN R520

To ensure that the backflow prevention device in this appliance can operate correctly by allowing water to discharge freely from the weir, overflow or spillover positioned flush with the casing of the appliance, a permanent spacer must be provided to ensure the appliance cannot be installed tightly
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IRN R525

An ‘Approved’ device providing backflow prevention protection to at least fluid category four shall be fitted at every point of connection between the water supply and the fitting or appliance.

IRN R530

Expansion vessels should be installed in the vertical orientation and located so that the length of the connecting pipework is kept to a minimum

IRN R535

The length of connecting pipework to this fitting should be kept to a minimum in order to prevent stagnation.

IRN R551

Can be used to achieve an Type AC air gap arrangement, additional verification to validate backflow prevention arrangements is required.

IRN R550

When an independent inlet valve is used in conjunction with a cistern to form an independent flushing cistern or to form a WC suite, additional verification to validate backflow prevention arrangements is required. Please refer to the clarifications of the requirements of the Water Supply (Water
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IRN R552

Cannot be used in a cistern supplying water required to be wholesome. Please note, water in a WC cistern is not required to be wholesome.

IRN R553

Cannot be used with a cistern supplying water required to be wholesome.

IRN R554

Float not supplied. Float must comply with BS6920 or equivalent if used with a cistern supplying water required to be wholesome. Please note water in a WC cistern is not required to be wholesome.

IRN R555

Not suitable for use to create a type AUK1 airgap arrangement.

IRN R556

Suitable for use in a WC suite, provided it forms an arrangement which meets the requirements of Type AUK1 and an appropriate WC performance specification.Please refer to the clarification of the requirements of the Water Supply(Water Fittings) Regulations, Byelaws in Scotland, as they apply to
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IRN R557

Inlet valve must be installed where light is excluded.

IRN R558

This fitting is not suitable to be used as part of a wholesome water system.

IRN R559

A Type AUK1 air gap must be maintained once installed. Please refer to clarification of the requirements of the Water Supply (Water Fittings)Regulations, Byelaws in Scotland, as they apply to Type AUK1 air gap arrangements in WC suites.

IRN R560

Not suitable for use with a cistern containing a fluid higher than fluid category 3.

IRN R561

This WC suite does not incorporate a compliant Type AUK1 air gap. Alternative fluid category 5 backflow protection will be required.

IRN R562

This valve has adjustable or dismantlable joints. When installed in a cistern, these joints must be above the critical water level.

IRN R570

This product may not comply with the requirements of regulation 4(1)(b). Consult your local water undertaker prior to installation.

IRN R571

When used in a close coupled/low level WC suite, to form part of a Type AUK1 air gap arrangement, the distance between the invert of the overflow and the spillover level of the WC pan must be no less than 300 mm.

IRN R572

Where this valve is to be retrofitted in a WC cistern, installers should seek confirmation from the WC suite manufacturer that it is compatible and the arrangement satisfies all applicable WC performance requirements.

IRN R573

Approved for use in WC flushing cisterns only

IRN R574

When installed, the outlet of the weir overflow from the air gap arrangement must not be restricted.

IRN R575

Where owners or occupiers propose to use equipment for dosing of chemicals, such as chlorine dioxide, to maintain water supply quality in premises (e.g. to protect against the growth of Legionella bacteria), dosed water must remain wholesome if used for domestic purposes. In accordance with
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IRN R576

Submerged inlets to baths or washbasins in any house or domestic situation are considered to be examples of a fluid category 3 risk based on DEFRA guidance. Submerged inlets to baths or washbasins in anything other than a house or domestic situation and sinks in any location are considered to be
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