COMMISSIONING
28 TECHNICAL DOCUMENTATION
GENERAL
The commissioning should only be carried out by qualified personnel. The guarantee may be void if this is not
adhered to.
Before operating the appliance, the following should be done:
• Switch off the electrical power supply of the appliance.
• Remove the casing front panel.
• Check the leak tightness of the gas connection.
• Check whether the electrical connection, including earthing, has been correctly made.
• Also, check whether the phase (L) has been connected properly. The boiler is phase sensitive.
• Fill the appliance and system with water.
• Fill the condensate trap with water.
• Check the flue gas discharge connection and, if present, the air supply connection.
• Open the gas valve and vent the gas pipe.
• Switch on the electrical power supply of the appliance.
• Check the built-in pump.
• Check the boiler at maximum load.
Start the boiler. Allow the boiler to run and stabilise (around three minutes). At full load, the following settings
should be checked and corrected if necessary:
REFERENCE VALUE FOR MAXIMUM LOAD
Reference value for CO
2
:
Reference value for CO:
Measure the gas pressure before the gas valve. At maximum load, this must be at least 17 mbar for natural
gas and 30 mbar for propane. If there are several boilers, this pressure should be measured with all boilers
operating at maximum load.
Check the water side temperature difference (ΔT) between the flow and return connections of the boiler. The
ΔT should be between 15°K and 25°K at full load.
Check the boiler at minimum load. At minimum load, the following settings should be checked and corrected
if necessary:
REFERENCE VALUE FOR MINIMUM LOAD
Reference value for CO
2
:
Reference value for CO:
8.4% ± 0.2
9.5% ± 0.2
< 50 ppm
< 70 ppm
8.4% ± 0.2
9.5% ± 0.2
< 10 ppm
< 10 ppm
(natural gas)
(propane)
(natural gas)
(propane)
(natural gas)
(propane)
(natural gas)
(propane)
G20, G25
G31
G20, G25
G31
G20, G25
G31
G20, G25
G31
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