Water Treatment; Commissioning - Worcester 29CDi Classic Installation, Commissioning And Servicing Instructions

5.4

WATER TREATMENT

NOTICE:
▶ ARTIFICIALLY SOFTENED WATER MUST NOT BE
USED TO FILL THE CENTRAL HEATING SYSTEM.
ENSURE THAT THE SYSTEM HAS BEEN CLEANED AS ON PAGE 10 OF
THESE INSTRUCTIONS.
FLUSHING (Central Heating):
▶ Switch off the boiler.
▶ Open all drain cocks and drain the system while the appliance is hot.
▶ Close drain cocks and add a suitable flushing agent at the correct
strength for the system condition in accordance with the
manufacturer's instructions.
▶ Run the boiler/system at normal operating temperature for the time
stated by the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris.
INHIBITOR (Central Heating):
▶ Check drain cocks are closed and all radiator valves are open before
adding a suitable inhibitor compatible with aluminium (or combined
inhibitor/anti-freeze if the system is exposed to freezing conditions)
to the heating system water in accordance with the manufacturers
instructions.
The pH value of the system water must be less than 8 or
the appliance guarantee will be invalidated.
▶ Fill the system to between 1 and 2 bar via the built-in charging link
(filling loop).
▶ Vent all radiators; tighten vents when complete.
▶ Re-pressurise if necessary to 1bar.
▶ Set all controls to maximum.
▶ Record the date when the inhibitor was added to the system on the
guarantee card.
NOTICE:
▶ The concentration 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 exchanger.
▶ In cases where all attempts to find a micro leak have
failed, Worcester, Bosch Group supports the use of
Fernox F4 leak sealer.
6 720 815 725 (2015/05)
5.5

COMMISSIONING

When running in the performance test mode, the boiler
will operate only the central heating circuit.
B
A
L
K
3 4
5
2
J
1 6
max
I
Fig. 52 Control panel
A ON/OFF button
B Cover or position for optional plug-in control
C Display
D System pressure gauge
E Reset button
F ECO button
G Holiday button
H DHW temperature control
I Central heating temperature control
J Performance test button
K Service button
L Burner indicator (GREEN)
M On/off and fault indicator (BLUE)
NOTICE: The combustion for the boiler is factory set.
No adjustment is required if the gas inlet pressure is
correct.
COMMISSIONING
C
2
1 1 3
0 4
bar
D
reset
eco
E
F
3 4
e
2
G
1 6
min max
H
M
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