© KWB – Kraft und Wärme aus Biomasse GmbH
IM Easyfire 10/2008
Page
65
6 Measuring the boiler
6 Measuring the boiler
6 BOILER,
MEASURING
The procedure for measuring a wood-fired boiler system is more complex than the procedure for measuring a gas-
fired or oil-fired boiler system. The wood flame reacts more slowly to adjustment and consequently requires more
time for stabilisation after changing the parameters.
It takes approximately 45 minutes (for an experienced pellet boiler installer) to 90 minutes to execute the described
work steps, in the interest of combustion quality, efficiency, and economical system operation.
6.1
Menu item – Measure Boiler
Use this function to automatically switch the automatic power control system off. Firing will remain on one load
stage. Only activate the function if the preparations for measuring have been concluded.
Normal operation:
Normal heating operation boiler temperature control system
Measuring PL /
Measuring ML /
Measuring NL:
Measuring partial load / medium load/nominal load Use this setting for fine adjustment of the
individual power stages with flue gas measuring device.
Attention!
The system does NOT switch off automatically in this function.
Only select this function if you are prepared to constantly monitor the system
!
6.2
Preparations for measuring the boiler
The following points must be complied with in order to obtain meaningful measurement results:
The boiler should have been in operation for an extended period. If this is not the case the emission values
(CO and HC) will be too high due to the evaporation of the paint finish on the boiler and of the oil covering applied in
manufacturing. However the CO
2
content of the flue gas can also be adjusted when commissioning.
1.
The measuring device must be in order (measuring cells OK, hoses impermeable and free of obstructions,
checked regularly).
2.
Set the fuel: Wood dry (theoretical maximum CO
2
value at ideal combustion: CO
2
max = 19.4 %)
3.
The measuring device must be calibrated in pure air.
4.
The measurement must be taken in the core flow of the flue gas (particularly at low power levels).
The flue gas temperature is highest in the core flow.
5.
The boiler should have no leaks. Infiltrated air reduces the efficiency.
6.
The measured values must be stable. If there are strong fluctuations the fuel bed must be inspected.
7.
Measurements ( chimney draught and emission measurements) must be taken with the boiler room door
closed.
8.
The measurement should be possible in “Measuring NL” mode (see point 6.1), control measurements are
possible in the other output stages.
MA-Easyfire 10.2008_EN.indd 65
MA-Easyfire 10.2008_EN.indd 65
30.03.2009 13:30:10 Uhr
30.03.2009 13:30:10 Uhr