Pressure Relief Pipework - Worcester Greenstar Heatslave 12/18 Instruction Manual

8 716 106 252f 30/3/10 12:56
Heating return
Hose
return
Stop
cock
Temporary hose
Heating return
Auto air
vent
Fill Point
K
J
K
L
12
WATER SYSTEMS & PIPEWORK
Page 12
Water main
supply
Non return Non return
valve valve
Stop
cock
Test cock
Make up
vessel
Non return
1000mm above
valve
the highest point
of the system
Stop
cock
J - Outside wall.
K - Drain pipe.
L - External drain.
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE 12/18-18/25-25/32
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:
• Plastic pipework must not be used for
the DHW system.
• 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.

PRESSURE RELIEF PIPEWORK:

• The pressure relief drain pipe (K) should be
at least 15mm diameter copper pipe and run
downwards away from the boiler and discharge
away from any electrics or other hazard,
preferably to an external drain or soakaway.
• Pipe (K) should be finished with a partial
bend, near the outlet to face the external wall
(as shown) to help prevent freezing.
IMPORTANT: The pressure relief valve is a
safety device for the boiler and if activated
may discharge boiling water or steam
through the relief valve drain pipe.
Care should be taken when siting the outlet
pipe so that it does not cause an obstruc-
tion or discharge above a window,
entrance or other public access where it
could cause a hazard.
8 716 106 252f (03/2010)