Apadt.Point small
Type of Fuel
Fuel user def
If load drops below this limit, the burner operates along parameterized ratio curves
without O
2
trim control. Set load limitation after setting O
2
trim control ratio curve. Load
limitation is usually curve point 2 load from basic parameterized ratio curve.
4.24 O
2
trim control when load changes (WD200)
When load changes under unfavourable setting conditions, the actual O
2
value will
drop below the minimum limit. To prevent this, parameterize an increase of the O
2
value during capacity change
O2 OffsetGas/Oil
.
Params. & Display
O2Contr/Guard
FuelSettings
Type ofAir-Change
O2 OffsetGas/Oil
LoadCtrlSuspend
FilterTimeLoad
Parameters
Type ofAirChange
Impact of air density change on O
2
value
●
like P air
, gas use
●
like theory
, oil use
O2 OffsetGas/Oil
O
2
trim control setting increase during capacity
control. Presetting 0.5%.
LoadCtrlSuspend
Limit of load difference when O
2
trim controller will
be locked. Presetting 5%.
FilterTimeLoad
Delay time of previous parameter, 5 => 5 x τ,
presetting.
4.25 Setting capacity controller operating mode
1. Set the boiler temperature setpoint W1 for the capacity controller as follows:
Description
Operation
BoilerSetpoint
SetpointW1
Internal setpoint W1, °F
Internal setpoint W1,
PSI
2. Start the burner manually by setting the
Autom/Manual/Off
option to
Autom
. The
preset value from burner control is IntLC.
M4219 2305EN
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