Water Treatment; Commissioning; Checking The Gas Inlet Pressure - Worcester 29CDi GC 47-406-34 Installation, Commissioning And Servicing Instructions

COMMISSIONING

5.4

WATER TREATMENT

NOTICE:
B ARTIFICIALLY SOFTENED WATER MUST NOT BE
USED TO FILL THE CENTRAL HEATING SYSTEM.
ENSURE THAT THE SYSTEM HAS BEEN CLEANED AS ON PAGE 9 OF
THESE INSTRUCTIONS.
FLUSHING (Central Heating):
B Switch off the boiler.
B Open all drain cocks and drain the system while the appliance is hot.
B Close drain cocks and add a suitable flushing agent at the correct
strength for the system condition in accordance with the
manufacturer's instructions.
B Run the boiler/system at normal operating temperature for the time
stated by the manufacturer of the flushing agent.
B Drain and thoroughly flush the system to remove the flushing agent
and debris.
INHIBITOR (Central Heating):
B 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.
B Fill the system to between 1 and 2 bar via the built-in charging link
(filling loop) .
B Vent all radiators; tighten vents when complete.
B Re-pressurise if necessary to 1bar.
B Set all controls to maximum.
B Record the date when the inhibitor was added to the system on the
guarantee card.
NOTICE:
B The concentration of inhibitor in the system should be
checked every 12 months or sooner if system content
is lost.
B The addition of sealing agents to the system water is
not recommended as this can cause problems with
deposits left in the heat exchanger.
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
2 5
J
1
6
max
I
Fig. 39 Control panel
32
C
2
1 1 3
0 4
bar
D
reset
eco
E
F
3 4
2 e
G
1
6
min max
H
M
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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 appliance is factory
set.
No adjustment is required if the gas inlet pressure is
correct.

5.5.1 CHECKING THE GAS INLET PRESSURE

The inlet pressure to the appliance must be checked using the following
procedure:
MEASURING THE INLET PRESSURE
Inlet pressure
test point
Fig. 40 Inlet pressure test point
B Close gas isolation valve.
B Slacken the screw in the inlet pressure test point a quarter turn and
connect a manometer.
B Open gas isolation valve.
B Measure the pressure with the boiler running at maximum.
– Press the Performance test button (J) for more than ten seconds
and set Central Heating temperature to maximum.
– The Performance test button (J) will illuminate continually and the
display (C) will alternate between
temperature.
B Check the gas supply working pressure at the gas valve conforms to
values shown in Fig. 41 or Fig. 42 .
Ensure inlet pressure is satisfactory with all other gas
appliances working.
NOTICE: Do not continue commissioning until the
correct gas inlet pressure is achieved.
B If pressure is satisfactory press the Performance test button (J) again
and the boiler will return to normal operation.
6720647361-58.1Wo
and the central heating flow
6 720 803 599 (2012/06)