Honeywell SV2 Series User Manual page 104

SV2 Series Safety Shut-off Valves
Ignition Optimization (OEM Setup + Ignition Setup + Base Curve Setup)
After establishing the first time ignition operation and curve entry, the ignition may be optimized as a function of a
particular burner modulation point (ignition load).
In the Ignition Setup screen/tab (refer to
parameters required for ignition optimization, refer to the following sections and
Control Startup Delay (Ramp Period + Hold On Period + Ignition Period parameters)
Refer to Fig. 59. The Ignition Period and Ramp Period (Ignition Setup page) start as soon as both solenoids are powered
by the burner management control. During the Ramp Period, the SV2 Series control is not active and the motor is
driven from the start position of the FCV to the Learnt Pos. 2. During the movement from the start position to Learnt
Pos. 2, the SV2 Series control monitors the FARMOD sensor signals to ensure that the amount of gas supplied for
ignition does not exceed the amount of gas set by the Ignition amplification (Ignition Setpoint parameter).
In addition to the startup delay of the Ramp Period, the startup of the fuel/air control (i.e. mass flow sensors being
active) can be delayed further up to 1 second before the end of the Ignition Period by entering a value greater than 0
for the Hold On Period parameter. The Fuel Control Valve is held at the controlled valve position during ignition for the
time specified for the Hold On Period.
The control startup delay allows for an ignition of the burner without the control reacting on the pressure pulls in the air
signals caused by the ignition of the burner.
By setting the Ignition Period to a longer duration than the safety time of the burner manager control, the SV2 Series
control will keep controlling to the ignition-specific amplification factor after the safety time has elapsed until the time
of Ignition Period has elapsed.
For example, these settings can be used to stabilize the flame before the SV2 Series valve control controls the
amplification factor to the value required during normal burner operation (RUN mode).
Fig. 59: Control startup delay.
Fig. 53), adjust the input values accordingly. For further details on the
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Fig. 59-Fig. 63.
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