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Rev 2.1
Table 4.18 – Lead Lag Slave Configuration Parameters
4-32 Lead Lag Master Configuration Parameters
Table 4.19 displays Lead Lag Master configuration parameters.
Refer to 5-14 LEAD LAG MASTER CONFIGURATION for Lead Lag Master parameter programming.
Parameter Comment Password
Master enabled Disabled: The master function is disabled.
Enabled: Enable the lead lag master.
Installer
LL CH setpoint This parameter provides the setpoint used during LL CH
demand.
Installer
LL CH TOD setpoint This setpoint is used when the time-of-day switch is on. Installer
Modbus port MB1, MB2 or No Port
Modbus port use for lead lag operation.
Installer
Modbus address 0-250
Modbus address used to communicate with the unit. This
address number must be unique for each burner on the
network.
Installer
Table 4.19 – Lead Lag Master Configuration Parameters
4-33 Lead Lag Master Configuration Parameters Advanced Settings
Following tables display Advanced Settings for Lead Lag Master configuration parameters.
Refer to 5-15 to 5-23 ADVANCED LEAD LAG CONFIGURATION for Lead Lag Master parameter programming.
Parameter Comment Password
Modulation backup sensor Select backup LL modulation sensor
Disable: No backup sensor will be used.
Lead outlet: Outlet temperature of the lead boiler will be
used as the backup sensor.
Outlet average: Average of the outlet temperatures of all
slave boilers that are firing will be used as a backup.
Installer
Off hysteresis Differential above setpoint when Last LL stage boiler is
turned off
2 °F to 30 °F (1 °C to 16 °C)
Installer
On hysteresis Differential below setpoint when First LL stage boiler is
turned on
2 °F to 30 °F (1 °C to 16 °C)
Installer
Hysteresis step time Time between hysteresis step changes
(0=Disable hysteresis stepping)
Installer
P-gain Proportional term of PID
0-400
Installer
I-gain Integral term of PID
0-400
Installer
D-gain
Differential term of PID
0-400
Installer
Table 4.20 – Lead Lag Advanced Setting: Modulation Parameters
Parameter Comment Password
Demand switch STAT terminal: the STAT input in the On condition
creates lead lag demand and it also must be on for
burner demand to exist; if it is off there is no demand.
Disable: Demand switch input is not used.
Installer
Setpoint source Local: Local setpoint is used as lead lag setpoint.
Modbus: Setpoint source from modbus communication
4-20mA: Setpoint is determined by the 4-20mA remote
input. Two parameters that determine the temperature at
the extremes (20mA and 4mA). If the 4-20mA signal is
invalid, then the setpoint source reverts to Local until the
4-20mA signal is stable again.
Installer
Time of day setpoint Setpoint when Time Of Day switch is on
32 °F to 240 °F (0 °C to 115 °C)
This setpoint is used when the time-of-day switch is on
If the Outdoor Reset function is active then this setpoint
provides one coordinate for the shifted outdoor reset
curve.
Installer
4 mA water temperature -40 to 266F (-40 to 130C)
This parameter provides the temperature for the
interpolation of 4-20mA curve. This value determines the
minimum possible value for the setpoint.
Installer
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