c)
d)
i)
ii)
i ii)
iv)
b) have a vertical section of pipe at least 300mm long, below the tundish before any elbows or
bends in the pipework
be installed with a continuous fall.
have discharges visible at both the tundish and the final point of discharge but where this is
not possible or is practically difficult there should be clear visibility at one or other of these
locations. Examples of acceptable discharge arrangements are;
ideally below a fixed grating and above the water seal in a trapped gully.
Downward discharges at low level; i.e. up to 1OOmm above external surfaces such as car
parks, hard standings, grassed area etc. 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.
Discharges at high level; e.g. into a metal hopper and metal down pipe with the end of the
discharge clearly visible (tundish visible or not) or onto a roof capable of withstanding high
temperature discharges of water 3m from any plastics guttering system that would collect
such discharges (tundish visible)
Where a single pipe serves a number of discharges. such as in block of flats, the number
served should be limited to not more than 6 systems so that and installation discharging can
be traced reasonable easily.The single common discharge pipe should be at least on pipe size
larger than the largest individual discharge pipe D2 to be connected lf unvented hot water
storage systems are installed where discharges from safety devices may not be apparent i.e.
in dwellings occupied by blind, infirm or disabled people,consideration should be given to
the installation of an electronically operated device to warn when discharge takes place.
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Note: The discharge will consist of scalding water and steam. Asphalt, roofing felt and nonmetallic rainwater goods may
be damaged by such discharges.
7. Flushing and Commissioning
- Ensure all pipe connections are tight, including immersion heate(s).
- Check the immersion heater setting is not above 60C and that the live and neutral connec-
tions are correct.
- Open a hot tap farthest from the unit. Open the mains stop cock to fill the unit.
- Flush for three minutes.
- Close off taps and check pipework for leaks.
- Switch on electricity to the immersion heate(s) or switch on the boiler. Refer to boiler manu
facturer s instructions or commissioning.
- Bring the unit to approx 65C. Check that water does not discharge via theTundish pipework
during heating.
