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WATER TREATMENT
ENSURE THAT THE SYSTEM HAS BEEN
CLEANED AS ON PAGE 8 OF THESE
INSTRUCTIONS.
FLUSHING (Central Heating):
1 Switch off the boiler (A).
Open all drain cocks (B) and drain the
system (C) while the appliance is hot.
2 Close drain cocks (D) and add a suitable
flushing agent (E) at the correct strength for
the system condition in accordance with the
manufacturer's instructions.
3 Run the boiler/system at normal operating
temperature (F) for the time stated by the
manufacturer of the flushing agent (G).
4 Drain (H) and thoroughly flush the system to
remove the flushing agent and debris ( I ).
INHIBITOR (Central Heating):
5 Check drain cocks are closed ( J ) and all
radiator valves are open (K) before adding a
suitable*inhibitor (or combined inhibitor/anti-
freeze if the system is exposed to freezing
conditions) to the heating system water (L) in
accordance with the manufacturers instructions.
6 Fill system via a WRAS approved filling loop
to between 1 and 2 bar.
7 Vent all radiators; retighten vents when
complete (M). Vent any air from the boiler
heat exchanger using a suitable container to
collect any water (N).
Ensure tube outlet (O) is directed away
from the fan or any other electrical
component to prevent damage. Also
place a suitable cover over the fan to
prevent any spillage of water onto
electrical connections. Ensure the cover
is removed after venting.
8 Vent all radiators (P).
Re-pressurise if necessary to 1bar (Q).
Set all controls to maximum (R).
Record the date when the inhibitor was
added to the system on the guarantee card.
NOTE: The concentration level of inhibitor in
the system should be checked every 12
months, or sooner if system content is lost.
The addition of sealing agents to the system
water is not recommended as this can cause
problems with deposits left in the heat exchang-
er.
IMPORTANT: 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.
* compatible with aluminium. The pH
value of the system water must be
less than 8 or the appliance guarantee
will be invalidated.
1
2
3
4
5
7
8
A
B
C
D
E
F
G
H
I
J
J
K
L
M
N
O
P
Q
R
KEY
Valve
Flushing
Agent
Inhibitor
WATER TREATMENT
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
32
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