PRE-INSTALLATION
6 720 804 532 (2012/09) 9
Fig. 3 Additional components
3 PRE-INSTALLATION
3.1 CLEANING PRIMARY SYSTEMS
BEFORE CLEANING THE SYSTEM:
▶ Ensure that the system and pipe work is in good working order.
▶ Where possible keep the existing boiler/circulating pump in place
when flushing the system.
FOLLOW THE GUIDANCE OF BS7593:
Treatment of water in domestic hot water central heating and also the
flushing guidelines below.
FLUSHING THE SYSTEM
▶ Fill the system with cold water and check for leaks.
▶ Open all drain cocks and drain the system.
▶ Close drain cocks and add a suitable flushing agent compatible with
aluminium at the correct strength for the system conditions in
accordance with the manufacturer‘s instructions.
The pH value of the system water must be less than 8 or the
appliance guarantee will be invalidated.
▶ Circulate the flushing agent before the boiler is fired up.
▶ 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.
1 Burner ON indicator light (green) 9 PRV pipe connection point
2 Power ON/OFF indicator/fault diagnostic light (blue) 10 CH return isolator
3 Position for optional programmer 11 Gas inlet connection 22mm & isolator
4 Reset button 12 CH flow isolator
5 System pressure gauge 13 Condensate connection
6 ECO button (not used) 14 CH temperature control
7 DHW temperature control* 15 Service mode button
8 Boiler identification label
Table 6 Additional boiler components
6720644743-04.2Wo
123
45
6
15
14
91011
13
12
7
8
* The DHW temperature control is only operational when
the “Optional Internal Diverter Valve” is fitted.
NOTICE:
▶ All the following Pre-Installation sections must be read
and requirements met before starting boiler or flue
installations.
CAUTION:
▶ ISOLATE THE MAINS SUPPLIES BEFORE STARTING
ANY WORK AND OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.
NOTICE:
Debris from the system can damage the boiler and
reduce efficiency.
Failure to comply with the guidelines for the use of water
treatment with the appliance will invalidate the
appliance warranty.
NOTICE: ARTIFICIALLY SOFTENED WATER MUST NOT
BE USED TO FILL THE CENTRAL HEATING SYSTEM.
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