PRE-
INSTALLATION
INSTALLATION & SERVICING INSTRUCTIONS
8 716 115 216b (09.2008)8 716 115 216b (09.2008)
8
WATER SYSTEMS & PIPEWORK
WATER SYSTEMS & PIPEWORK
Heating return
Auto
air vent
Non return
valve
Stop
cock
Make up
vessel
1000mm
above the
highest point
of the system
PRIMARY SYSTEM PLASTIC PIPEWORK:
• Any plastic pipework must have a polymeric
barrier with 600mm (minimum) length of
copper pipe connected to the boiler.
• Plastic pipework used for underfloor
heating must be correctly controlled with
a thermostatic blending valve limiting the
temperature of the circuits to approx. 50°C.
The pipework from the boiler to the
blending valve must be in copper.
PRIMARY SYSTEM CONNECTIONS/VALVES:
• Do not use galvanised pipes or radiators.
• All system connections, taps and mixing
valves must be capable of sustaining a
pressure of 3 bar.
• Radiator valves should conform to
BS2767:10.
• All other valves should conform to BS1010.
• On new installations TRV’s must be used
on all radiators except the radiator where
the room thermostat is sited, this must be
fitted with lockshield valves and left open.
All installations should, at least, have TRV's
fitted to radiators within the sleeping
accommodation.
• An automatic bypass valve must be
connected between the heating flow and
return where TRV's are used on all radiators
unless one of the parts is open to flow
(refer to “Water Systems and Pipework
section).
• A drain cock should be fitted at all the
lowest points of the heating circuit.
• Air vents are required at all high points on
the system.
FILLING PRIMARY SEALED SYSTEMS:
• Filling the primary 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 loops must be WRAS approved.
Fill point
Heating return
Hose
return
Non
return
valve
Non
return
valve
Test cock
Stop
cock
Water main
supply
Stop
cock
Temporary
hose
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