COMMISSIONING
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32
▶ Once the system has been filled to a pressure of 1.5 bar push the
lever [1] back into closed position.
Fig. 49 Stop filling the system
▶ Vent all radiators, retighten when completed and check the system
and correct any leaks.
• The boiler integral expansion vessel is pre-charged to 0.75 bar
(equal to a static head of 7.5 meters [22ft]). A Schraeder type valve
is fitted to the expansion vessel to allow for pressure adjustment if
required.
• If an extra expansion vessel is fitted to the central heating return,
adjust to the
same pressure
as the appliance internal expansion
vessel, refer to separate instructions with the extra expansion vessel.
GAS SUPPLY
▶ Open gas cock on the boiler and purge the gas supply to the boiler
ensuring that the room is well ventilated.
▶ Test gas supply for tightness as described in
BS 6891.
5.3
STARTING THE APPLIANCE
SWITCHING THE APPLIANCE ON/OFF:
1. Turn on mains power supply.
▶ Turn on any external controls.
▶ Set the thermostatic radiator controls to maximum temperature.
▶ Set the clock/programmer to continuously ON and the room
thermostat to maximum temperature.
– 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)
– N - Automatic air vent
Fig. 50 Control panel
▶ Press button (A) and the power on indicator (M) illuminates BLUE.
After a few seconds the display (C) will show the flow temperature.
2. Turn the CH temperature control (I) to maximum. The burner on
indicator (L) illuminates GREEN when the burner has lit.
3. If the boiler fails to light the BLUE power indicator (M) and reset
button (E) will flash alternately.
To reset press and hold the reset button (E) for two seconds. The
boiler will be reset.
Fig. 51 Auto Air Vent
NOTICE:
Never run the appliance when the appliance/
system is empty or partially filled.
6 720 812 176-13.1O
▶ The first time the appliance is switched on, a once-
only venting function is activated. The heating pump
then switches on and off at intervals. This sequence
lasts about 8 minutes. The display shows
in
alternation with the CH flow temperature.
Ensure that the automatic air vent (N) is open.
▶ The boiler then runs for 15 minutes at minimum
heating output to fill the condensate trap, the display
(C) alternates between “-II-”and the central heating
flow temperature. This occurs every time the mains
supply has been interrupted.
CAUTION:
DO NOT PRESS THE POWER INDICATOR (M)
TO RESET THE BOILER.
1
2
3
4
5
6
max
2
3
1
0
4
bar
1
reset
eco
1
2
3
4
e
6
max
min
A
J
B
K
C
L
D
M
E
F
G
H
I
6720647361-23.2Wo
N
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