Five (5) seconds after opening the safety valves the pilot gas is shut off.
The main flame has to be stable, itis checked by the flame monitoring unit
continuously.
The 5 seconds during which the pilot valve (pos. MK) and the main valves (pos.
VA1 and VA2) are in the open position is called the second safety time. If the
flame is not formed within this time the flame guard goes into lockout and an
error message is displayed on the electronic module.
The maximum gas pressure switch (pos. HD1) ensures an easy steady start of
the main flame. It is only active when starting the flame. The minimum gas
pressure switch (pos. LD1) monitors the supply gas pressure continuously at the
lowest applicable level.
H. After the main flame has formed and the start sequence of the burner control
panel is successfully gone through, the burner is “in operation” on low flame.
Approx. 35 seconds after opening the main valves the load controller starts
setting the load.
I. If the load control switch on the control panel is set to 1 Auto, the burner load and
switching on and off will be controlled by the load control unit.
The maximum gas pressure switch (pos. HD) monitors the maximum burner load
by measuring the gas pressure.
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