andrews SUPAflo EVO SF60 EVO, Installation And Service Manual

Page: 28 / 48

Commissioning
28
Combustion analysis
Combustion check at full load
Start the boiler in controller stop
mode and go to 50% load. Now the
boiler operates at 50% load. Allow
the boiler to stabilise the combus -
tion for 3 minutes. Then increase
the boiler load step by step up to
100%.
Check the gas pressure on the inlet
of the gas valve while increasing the
boiler load:
the gas pressure should never go be -
low the minimum required value
→
see technical data.
When an (optional) minimum gas
pressure switch is connected, this
must be set to 75% of the required
gas pressure.
Check the combustion settings via
the test point in the chimney con -
nection (1).
If necessary, correct the settings
with the small adjustment screw (2)
under the cap (3) at the top of the
gas valve.
Combustion settings max. load
for natural gas G20 / G25
CO
2
max. G20 / G25 % 10,2 ± 0.2
Combustion settings min. load
for natural gas G20 / G25
CO
2
min. G20 / G25 % 9,4± 0.2
Combustion check at minimum load
Switch the boiler to minimum load
(0%).
Check the combustion settings the
same way as described for full load.
If necessary, correct the settings
with the large adjustment screw at
the top of the gas valve (4).
Combustion check at 50% load
An additional reference check of
combustion values at 50% load is
recommended in order to check if
the gas valve is set in such way, that
the modulating behaviour is normal.
The CO2 value should be in between
the settings of full load and minu -
mum load.
CO value should be equal to full load
and minimum load values.
Make sure that the boiler is set to
automatic operation and controller
stop mode is disabled after the com -
bustion test is finished.
Combustion settings max. load
for G31 (I3P)*
CO
2
max. G31 (I3P) % 11,9± 0.2
Combustion settings min. load
for G31 (I3P)*
CO
2
min. G31 (I3P) % 10,0± 0.2
1
4
2
3
Combustion settings max. load
for G30 / G31 (I3B/P)*
CO
2
max. G30 (I3B/P) % 12,7± 0.2
CO
2
max. G31 (I3B/P) % 10,9± 0.2
Combustion settings min. load
for G30/G31 (I3B/P)*
CO
2
min. G30 (I3B/P) % 11,9± 0.2
CO
2
min. G31 (I3B/P) % 10,0± 0.2
*Use conversion kit for I3P and I3B/P