elco THISION WH, Operation And Installation Manual

Page: 20 / 30

Commissioning
Combustion analysis
Combustion check at full load
Start the water heater in controller stop
mode and go to
50% load. Now the
boiler operates at 50% load. Allow the
boiler to stabilise the combustion for 3
minutes. Then increase the waterheater
load step by step up to 100%. Check the
gas pressure on the inlet of the gas
valve while increasing the water heater
load: the gas pressure should never go
below the minimum required value

see technical data. When an (optional)
minimum gas pressure switch is con-
nected, this must be set to 75% of the
required gas pressure.
Check the combustion settings via the
test point in the chimney connection
(1). If necessary, correct the settings
with the small adjustment screw at the
top of the gas valve (2).
Combustion check at minimum load
Switch the water heater 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 (3).
Combustion check at 50% load
An additional reference check of com-
bustion values at 50% load is recom-
mended in order to check if the gas
valve is set in such way, that the modu-
lating behaviour is normal. The CO
2
value should be in between the settings
of full load and minumum load. CO
value should be equal to full load and
minimum load values.
Make sure that the boiler is set to auto-
matic operation and controller stop mo-
de is disabled after the combustion test
is finished.
1
Combustion settings max. load
for natural gas G20 / G25
TH-L 100-145
CO
2, max
% 8.7±0.2
CO
max
ppm < 70
TH-L 65-85
CO
2, max
% 8.5±0.2
CO
max
ppm < 70
Combustion settings max. load
for LPG G31
Convert boiler before operation
(see coversion kit instruction)
TH-L 100-145
CO
2, max
% -
CO
max
ppm -
TH-L 65-85
CO
2, max
% -
CO
max
ppm -
Combustion settings min. load
for natural gas G20 / G25
TH-L 65-145
CO
2, min
% 8.5 ± 0.2
CO
min
ppm < 30
Combustion settings min. load
for LPG G31
Convert boiler before operation
(see coversion kit instruction)
TH-L 65-145
CO
2, min
% -
CO
min
ppm -
2
3
20