ALTERNATIVE DISCHARGE
SECONDARY RETURN
Downward discharges at low level, i.e. up to 100mm
above external surfaces such as car parks, hard
standings, grassed areas 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.
Discharge 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 and 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 blocks of flats, the number served should be
limited to not more than 6 systems so that any installation
discharging can be traced reasonably easily. The single
common discharge pipe should be at least one pipe size
larger than the largest individual discharge pipe to be
connected. For further information contact your Building
Control Office or The British Board of Agrément.
FIGURE 5
1. Secondary Return Fitting use 1/2’’F x 1/2’’ M x 15mm Tee (not supplied)
2. Non Return Valve
3. Circulation Pump
4. Secondary Return Line
5. Balanced cold supply for showers or bidet only
HOTWATER UK Ltd.
All replacement parts must be supplied by OSO HOTWATER (UK) LIMITED.
To obtain the address of a local stockist contact:
OSO HOTWATER (UK) LTD.
E15 Marquis Court - Team Valley Trading Estate - Gateshead - Tyne&Wear, NE11 0RU
Phone: (0191) 482 0800 • Fax: (0191) 491 3655 • www.oso-hotwater.com
E-mail:
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