6 Commissioning and startup
6.3 Setting the air pressure switch
Switching point must be checked and, if necessary, adjusted during commissioning.
u Connect the pressure gauge for differential pressure measurement.
u Start the burner.
u Check differential pressure over the whole operating range and determine the lowest
differential pressure.
u Drive the burner to the point with the lowest differential pressure and turn the setting
disk on air pressure switch slowly to the right until the burner shuts down.
u Set the air pressure switch at 80% of the verified value at the setting cam 1.
Example Lowest differential pressure 1.7” w.c.
Switching point air pressure switch (80%) 1.7” w.c. x 0.8 = 1.4” w.c.
Site specific conditions (such as: flue gas system, heat exchanger, boiler room, etc)
might affect the air pressure switch and, therefore, it might require a different value than
the above recommended setting.
6.4 Concluding works
u Check the functions of all safety devices (Gas pressure switches, Thermostat,
Pressure sensor, etc.).
u Close / remove gas pressure gauges and close all measuring ports.
u Record burner settings and combustion test results.
u Inform the owner on how to operate the system.
u Keep a copy of this manual on site for the plant operator.
83055116 • 1/2016-05
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Installation and Operating Instructions
G
as burner WG20.../1-C ZM-LN (W-FM 25)
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