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2.9 CONNECTION TO SERVICES

It is recommended that a 22mm pipe run should supply the outlets

throughout the building, especially to baths and showers. Short runs of

15mm pipe may be used to connect basins and sinks.

On floor-standing models a secondary return may be fitted (consult the label

on the face of the unit for the correct location). A non-return valve (not

supplied) must be fitted to prevent back flow and a bronze pump will be

needed in conjunction with a pipe thermostat to circulate the hot water (both

not supplied).

NOTE: an extra expansion vessel may be required where the additional

volume of the secondary return exceeds the capacity of the expansion

vessel supplied.

1) The tundish must be vertical and fitted within 500mm of the temperature

& pressure relief valve and must be located with the cylinder. The tundish

must also be in a position visible to the occupants, and positioned away

from any electrical devices. The discharge pipe from the tundish should

terminate in a safe place where there is no risk to persons in the vicinity

of the discharge and to be of metal.

2) Discharge pipes from the temperature & pressure relief and expansion

relief valve may be joined together.

3) The pipe diameter must be at least one pipe size larger than the nominal

outlet size of the safety device unless it's total equivalent hydraulic

resistance exceeds that of a straight pipe 9m long.

I.e. Discharge pipes between 9m and 18m equivalent resistance length

should be at least 2 sizes larger than the nominal outlet size of the safety

device. Between 18m and 27m at least 3 larger, and so on.

Bends must be taken into account in calculating the flow resistance.

See

FIG. 2.9 and TABLE 2.

4) The discharge pipe must have a vertical section of pipe at least 300mm

in length, below the tundish before any elbows or bends in the pipework.

5) The discharge pipe must be installed with a continuous fall.

6) The discharge must be visible at both the tundish and the final point of

discharge, but where this is not possible or practically difficult; there

should be clear visibility at one or other of these locations. Examples of

acceptance are:

i) Ideally below a fixed grating and above the water seal in a trapped

gully.

ii) Downward discharges at a low level; i.e. up to 100mm above

external surfaces such as car parks, hard standings, grassed

areas etc. These are acceptable providing that where children

may play or otherwise come into contact with discharges, a wire

cage or similar guard is positioned to prevent contact, whilst

maintaining visibility.

iii) Discharges at high level; I.e. into a metal hopper and metal down

pipe with the end of the discharge pipe clearly visible (tundish

visible or not). Or onto a roof capable of withstanding high

temperature discharges of water 3m from any plastic guttering

systems that collect would such a discharge (tundish visible).

iv) Where a single pipe serves a number of discharges, such as in

blocks of flats, the number served should be limited to not more

than 6 systems so that any installation can be traced reasonably

easily. The single common discharge pipe should be at least one

pipe size large than the largest individual discharge pipe to be

connected. If unvented hot water storage systems are installed

where discharges from safety devices may not be apparent I.e. in

dwellings occupied by the blind, infirm or disabled people,

2.10 SECONDARY RETURN

2.11 DISCHARGE PIPEWORK

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