Honeywell SV2 Series User Manual page 107

controlled amplification setting can be changed relative to the normal amplification setting (based on the
control curves) at the start load (RUN) (as governed by the Ignition Setpoint % parameter)
The Ignition Setpoint % defines whether the mixture during the ignition phase is the same, leaner or richer relative to
normal operation at ignition load. This occurs AFTER the Ramp Period and Hold On Period timers have expired, when
the valve control loop starts to modulate.
If the Ignition Setpoint % is at 100%, there is no change compared to normal operation at ignition load.
If the Ignition Setpoint % is above 100%, it causes an enriched fuel/air mixture during ignition with an
increased amplification factor. This occurs after the Ramp and Hold On Periods have expired. Refer to
If the Ignition Setpoint % is below 100%, it causes a leaner fuel-air mixture during ignition with a decreased
amplification factor. This occurs after the Ramp and Hold On Periods have expired. Refer to
NOTES:
– If the Ramp Period is set to a relative long time, the ignition of the burner will occur during the ramp up, causing lean
ignition.
– If the Ramp Period is set to a short time, the ignition of the burner will occur at a mixture setting governed by the
Ignition Setpoint % value. The actual setting of the mixture during the ignition phase depends on the mixture setting
at ignition load as defined by the control curves (Base and Correction Curves) and the Ignition Setpoint % setting.
₀ The Ignition Setpoint % defines whether the mixture during the ignition phase is leaner or richer than during normal
operation at ignition load
Fig. 62: Ramped startup with control startup delay and enriched mixture.
SV2 Series Safety Shut-off Valves
V2F, V2V
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
107
Fig. 62.
Fig. 63.