38
Measuring the Ventilation Loss The ventilation loss has to be measured 30 seconds after
burn-out. It is based on the measurement of the flow speed
and of the temperature of the residual core flow. The test
fulfills the requirements of DIN EN 15378, national annex,
concerning the evaluation of the ventilation loss of boilers.
How to perform the measurement:
Fig. 46: S-tube probe
NOTE!
A room temperature probe can be connected. Connect the
Special Wall Temperature Probe (see accessories) to jack
12, fig. 1.
If you do not connect any room temperature probe, the tem-
perature measured by the internal probe will be adopted.
• In the submenu "Heating check", select "ventilation loss".
Confirm with OK.
• Enter or control the parameters. (Nominal power, diameter
of the flue gas pipe, outside temperature and ambient pres-
sure).
Press "Procced". A message will appear: "Zeroing pressure
sensor. Remove hoses."
• Confirm with "OK". The pressure sensor will be zeroed. It is
important that the S-tube probe is not connected yet.
NOTE!
If the Lindab PC 410 is equipped with an internal ambient
pressure probe, the meter will determine the ambient pres-
sure automatically.
• Connect the S-tube probe to the Lindab PC 410.
• Insert the closed S-tube through the measurement opening
into the gas line, while the burner is working.
• Fix the S-tube with a cone, open it as shown in Fig. 47 and
direct the sensors as shown in the figure.
• If necessary, adjust the S-tube with the knurled screws, so
that it fits into the gas line.
NOTE!
Do not change the position of the meter after the pressure
sensor has been zeroed. The sensor is extremely sensitive.
Fig. 48: Entering the parameters for the
ventilation loss measurement
Fig. 47: Measuring the air speed with the
S-tube
Static pressure
Temperature
Immersion
depth
Knurled screws
Flow
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