7.3
Commissioning procedure
7.3.1
De-Aeration function
Before turning on the power to the boiler, rotate the CH control knob ( )
fully anticlockwise.
The purpose of the function is to remove as much air as possible from the
heating system. To assist this it is essential that all precautions are taken
to remove air manually before enabling the function. Ensure that all
radiators are fully bled, starting on the lowest floor in properties of more
than one storey. Any high points in the system should be fitted with a
suitable venting device. On the boiler’s first power up de-aeration lasts
approximately 7 minutes. The boiler will not operate during this process.
1. Turn on the power to the boiler. The display shows "000" .
2. Turn the CH control knob ( )
1
/
4
turn clockwise twice in quick
succession (within 2 seconds).
3. Display shows "312" while de-aeration is taking place (approximately
7 minutes).
4. When de-aeration has completed, the display will show the primary
flow temperature and the CH ( ) symbols.
Important
If during the first commissioning process the power to the boiler is
interrupted the de-aeration function will re-start automatically at
the point which it stopped once power is restored.
Caution
If the system is drained in the future (even partly, when replacing
a radiator for example) the de-aeration function must be repeated.
Also the inhibitor concentration must be checked and replenished
if necessary.
7.4
Gas settings
7.4.1
Check the operational (working gas inlet pressure and
gas rate)
Important
If the pressure drops are greater than shown in the diagram
opposite, a problem with the pipework or connections is indicated.
Permissible pressure drop across system pipework ≤ 1mbar.
Carry out chimney sweep.
See
Checking combustion - chimney sweep mode, page 43.
Fig.35
Setting de-aeration
R
Reset
bar
0
1
2
3
4
Min
M
a
x
M
a
x
Min
R
M
a
x
Min
R
x 2
PN-0000398
Fig.36
Gas meter to valve
EV1
EV2
P
. OUT
1 2
3 4
VENT
RQ
ADJ.
17-21 mbar
PN-0000361
19-23 mbar
18-22 mbar
A
7 Commissioning
42
