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3.10

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.

3.11

Secondary Return

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 and timer 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.

3.12

Discharge Pipework

Note!

The safety relief valves must not be used for any other purpose

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

relief valve may be joined together.

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

& pressure relief valve and must be located with the cylinder but away

from any electrical devices. 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 of metal and terminate in a safe

place where there Is no risk to persons in the vicinity of the discharge.

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. 3.10 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 and should be

at least one pipe diameter clear of the wall where It terminates.

6) The discharge should 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; Onto a roof capable of withstanding high

temperature discharges of water 3m from any plastic guttering

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

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

blocks of flats, i.e. into a metal hopper and metal down pipe with

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

not), the number served should be limited to not more than 6

systems so that any installation can be traced reasonably easily.