Pre-Installation; Cleaning Primary Systems - Worcester GREENSTAR 24i Junior Installation, Commissioning And Servicing Instructions

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Fig. 3 Additional components
1 Burner ON indicator light (green)
2 Power ON/OFF indicator/fault diagnostic light (blue)
3 Position for optional programmer
4 Reset button
5 System pressure gauge
6 ECO button
7 DHW temperature control
8 Boiler identification label
9 PRV pipe connection point
Table 5 Additional boiler components
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PRE-INSTALLATION

3.1

CLEANING PRIMARY SYSTEMS

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.
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.
6 720 802 047 (2013/05)
1 2
15 14 13 12
3 4 5
11 10 9
10 CH return isolator
11 DCW mains in isolator
12 Gas inlet connection 22mm & isolator
13 DHW connection
14 CH flow isolator
15 Condensate connection
16 CH temperature control
17 Service mode button
FOLLOW THE GUIDANCE OF BS7593:
Treatment of water in domestic hot water central heating and also the
flushing guidelines below.
NOTICE: ARTIFICIALLY SOFTENED WATER MUST NOT
BE USED TO FILL THE CENTRAL HEATING SYSTEM.
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.
PRE-INSTALLATION
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