Worcester GREENSTAR HEATSLAVE 12/18 Instruction Manual page 13

Heating return
Stop
cock
Temporary hose
3 bar pressure
reducing
Incoming mains
stop valve valve
MCW
Check valve/
non return valve
Balanced cold water
supply to property
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
6 720 802 432 issue A 04/2012
Water main
Non return Non return
valve valve
Hose
return
Stop
cock
Test cock
Mini expansion
vessel
0.75Ltr capacity
Hot water supply
to property
supply
Greenstar Heatslave
oil fired combination boiler
WATER SYSTEMS & PIPEWORK
FILLING PRIMARY SEALED SYSTEMS:
• Filling the system must comply with one of the
methods shown opposite.
• The filling point must be at low level and must
never be a permanent direct fixing to the
mains water supply.
• Filling links must be WRAS approved.
SHOWERS/BIDETS:
• If a shower head can be immersed in water or
comes closer than 25mm from the top edge
of a bath or shower tray spill over level then
an anti-siphon device must be fitted to the
shower hose.
Only thermostatically controlled showers are
suitable for use with this appliance.
• Bidets with direct hot & cold mains water can
be used (with the approval of the local water
authority) and must be the over rim flushing
type with shrouded outlets to prevent the
fitting of hand held sprays.
DOMESTIC HOT WATER:
• Taps and mixing valves must be capable of
sustaining a pressure up to 10 bar in
accordance with the Water Regulations as
they will be operating at mains water pressure.
• Hot water temperature and flow rate are
affected by the size and insulation of pipework
making up the distribution system and are
controlled by the hot water tap and the water
main inlet pressure. A mixing valve can be fitted
if a more permanent setting is required.
• If using more than one outlet at once causes
water flow starvation, fit flow balancing valves
or Ball-O-Fix valves to the appropriate outlets.
Plastic pipework
• Any plastic pipework used for the DHW
system must have a polymeric barrier,
complying with BS 7921 and installed to
BS 5955 with 1000mm (minimum) length
of copper or steel pipe connected to the boiler.
• Before installing plastic pipework, the pipe
manufacturer's literature should be consulted.
• To prevent the temperature & pressure
exceeding the limits advised by the pipe
manufacturer, a pressure reducing valve should
be used to prevent the incoming water
pressure exceeding 3 bar (maximum). Also a
mini expansion vessel must be fitted to absorb
the expanding water.
• When selecting plastic pipework for use with
domestic water supply, it should be ensured that
it is compliant with all current local & national
legislation & regulations, including building
regulations part G, BS 7291 - 1,2 & 3: 2006,
BS 8000 - 15-15: 1990 and information.
WATER SYSTEMS & PIPEWORK
13