Manual ACV SLE W 240 (page 20 of 40) (English)

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G3 REQUIREMENTS AND GUIDANCE

Discharge pipe from safety valves

The Building Regulation G3 requires that any discharge from an unvented system is con-

veyed to where it is visible, but will not cause danger to persons in or about the building.

The tundish and discharge pipes should be ﬁ tted in accordance with the requirements and

guidance notes of Building Regulation G3. The G3 Requirements and Guidance sections

3.50 - 3.63 are detailed below.

For discharge pipe arrangements not covered by G3 Guidance advice should be sought

from your local Building Control O cer.

Main characteristics :

• Any discharge pipe connected to the pressure relief devices (Expansion Valve and

Temperature/Pressure Relief Valve) must be installed in a continuously downward di-

rection and in a frost free environment.

• Water may drip from the discharge pipe of the pressure relief device.

• This pipe must be left open to the atmosphere.

• The pressure relief device is to be operated regularly to remove lime deposits and to

verify that it is not blocked.

A typical discharge pipe arrangement is shown on next page.

General remarks

• Discharge pipe-work D2 can now be a plastic pipe but only pipes that have

been tested to a minimum 110°C must be used.

• Discharge pipe D2 can now be plumbed into the soil stack but only soil stacks

that can handle temperatures of 99°C or greater should be used.

Extract from “The Building Regulation G3” :

Discharge pipe D1

3.50 Safety devices such as temperature relief valves or combined temperature and pres-

sure and pressure relief valves (see paragraphs 3.13 or 3.18) should discharge either

directly or by way of a manifold via a short length of metal pipe (D1) to a tundish.

3.51 The diameter of discharge pipe (D1) should be not less than the nominal outlet size of

the temperature relief valve.

3.52 Where a manifold is used it should be sized to accept and discharge the total di-

scharge from the discharge pipes connected to it.

3.53 Where valves other than the temperature and pressure relief valve from a single

unvented hot water system discharge by way of the same manifold that is used by the

safety devices, the manifold should be factory fitted as part of the hot water storage

system unit or package.

Tundish

3.54 The tundish should be vertical, located in the same space as the unvented hot water

storage system and be fitted as close as possible to, and lower than, the valve, with

no more than 600mm of pipe between the valve outlet and the tundish.

Note: To comply with the Water Supply (Water Fittings) Regulations, the tundish should in-

corporate a suitable air gap.

Smart SL-SLEW : A1007850 - 661Y1700 • F - draft

Installation

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Others manual(s) of ACV SLE W 240

ACV SLE W 240 User Manual - German - 36 pages

ACV SLE W 240 User Manual - Dutch - 36 pages

ACV SLE W 240 User Manual - Dutch - 12 pages

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ACV SLE W 240 Manual

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