Lead Lag Master Configuration Parameters; Lead Lag Master Configuration Parameters Advanced Settings - Ace Heating Solutions Atlas A050 Operating And Maintenance Manual

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
Master enabled
LL CH setpoint
LL CH TOD setpoint
Modbus port
Modbus address

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
Modulation backup sensor
Off hysteresis
On hysteresis
Hysteresis step time
P-gain
I-gain
D-gain
Parameter
Demand switch
Setpoint source
Time of day setpoint
4 mA water temperature
Table 4.18 – Lead Lag Slave Configuration Parameters
Disabled: The master function is disabled.
Enabled: Enable the lead lag master.
This parameter provides the setpoint used during LL CH
demand.
This setpoint is used when the time-of-day switch is on.
MB1, MB2 or No Port
Modbus port use for lead lag operation.
0-250
Modbus address used to communicate with the unit. This
address number must be unique for each burner on the
network.
Table 4.19 – Lead Lag Master Configuration Parameters
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.
Differential above setpoint when Last LL stage boiler is
turned off
2 °F to 30 °F (1 °C to 16 °C)
Differential below setpoint when First LL stage boiler is
turned on
2 °F to 30 °F (1 °C to 16 °C)
Time between hysteresis step changes
(0=Disable hysteresis stepping)
Proportional term of PID
0-400
Integral term of PID
0-400
Differential term of PID
0-400
Table 4.20 – Lead Lag Advanced Setting: Modulation Parameters
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.
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.
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.
-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.
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