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▶ Run the boiler/system at normal operating temperature as directed
by the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris.
▶ It may be necessary to use a power flushing machine to aid the
cleansing procedure in some circumstances.
▶ Close the drain cocks and refill with fresh water and a suitable
inhibitor.
▶ Vent any air from the boiler and system.
INHIBITOR
Add a suitable inhibitor or combined inhibitor/anti-freeze, if the system
is exposed to freezing conditions, to the heating system in accordance
with the DWTA code of practice and manufacturer's guidelines.
WARNING: Sealing agents
▶ The addition of sealing agents to the system water is
not permitted as this can cause problems with
deposits left in the heat exchanger.
Water treatment
Suitable water treatment products can be obtain from the following
manufacturers:
FERNOX
0870 601 5000
www.fernox.com
SENTINEL
0800 389 4670
www.sentinel-solutions.net
3.2
MAINS SUPPLY
3.2.1
Electrical supply
• Supply: 230V - 50 Hz, 140 Watts
• Cable: PVC insulated 0.75 mm2 (24 x 0.2 mm) temperature rated to
90°C.
• External 3A fuse to BS1362.
• The appliance must be earthed.
• This appliance must not be connected to a three phase supply.
• IPX4D.
• Wiring must comply with the latest IET wiring regulations.
3.2.2
Gas supply
• Boilers using Natural Gas (NG) must be connected to a governed
meter.
• Liquid Petroleum Gas (LPG) must be connected to a regulator.
• Installation and connection of the gas supply to the boiler must be in
accordance with BS6891.
• Under no circumstance should be size of the gas supply pipe be less
than 22 mm.
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier. This is to ensure that the equipment is
in good working order and can meet the gas flow and pressure
requirements, in addition to the demand from any other appliance
being served.
6 720 815 723 (2015/05)
3.3
WATER SYSTEMS & PIPE WORK
PLASTIC PIPEWORK:
• Any plastic pipe work must have a polymeric barrier with 600 mm
(minimum) length of copper or steel pipe connected to the boiler.
• Plastic pipe work used for underfloor heating must be correctly
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50°C.
The pipe work from the boiler to the blending valve must be in copper
or steel (protected from corrosion).
CONNECTIONS/VALVES:
• All system connections, taps and mixing valves must be capable of
sustaining a pressure up to 3 bar.
• Radiator valves should conform to BS2767:10.
• Do not use galvanised pipes or radiators.
• All other valves should conform to BS1010.
• On new installations, or extensions to existing systems where a
radiator previously did not exist, each radiator should be fitted with a
TRV, except the one fitted in the same room/area as the room
thermostat.
• On boiler only replacement jobs, it is recommended, (but not
mandatory,) to fit a TRV on each radiator. It is, however, a
requirement, for energy conservation purposes, to recommend to
the customer that a TRV is fitted to each radiator.
• An automatic bypass may be required, (downstream of the pump), in
order to maintain the minimum flow-rate through the appliance.
• An air vent is required at the highest point on the system.
SEALED PRIMARY SYSTEM:
NOTICE: Artificially softened water must not be used to
fill the central heating system.
• The CH sealed system must be filled using a WRAS approved filling
loop or comply with figure 5 for system fill.
• An expansion vessel, of a size suitable for the system, must be fitted
as close as possible to the appliance in the central heating return.
• Also fit a pressure gauge, a 3 bar pressure relief valve and stop cock
(fixed cylinder type or sealed system approved connection).
• Do not use galvanised pipes or radiators.
SYSTEM FILL
SYSTEM FILL
Heating
return
Hose union
SV
Temporary hose
AA = Auto Air vent
CV = Check Valve
CV = Check Valve
SV = Stop Valve
SYSTEM MAKE UP
Make up
Heating
vessel
AA
return
CV
SV
Fill point
Fig. 5
System fill/System make-up
PRE-INSTALLATION
Mains
supply
CV
CV
SV
Test point
1000 mm (39 in)
above the highest
point of the system.
9
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