63
Rev 2.1
20 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
maximum possible value for the setpoint.
Installer
Outdoor reset Enable or disable
This parameter enables or disables the lead lag master
outdoor reset operation.
Installer
Table 4.21 – Lead Lag Advanced Setting: CH Parameters
Parameter Comment Password
Priority source DHW heat demand
Disabled
Installer
Priority method Boost during priority time
Drop after priority time
Installer
DHW priority override time If this parameter is non-zero then a DHW demand will
shift its priority vs. other demand sources according to
the specified time. The priority override timing is reset
when demand from the DHW source turns off.
Installer
Table 4.22 – Lead Lag Advanced Setting: DHW Parameters
Parameter Comment Password
Enable Enabled or disabled
Allows use of frost protection
Installer
Outdoor setpoint -40 to 266F (-40 to 130C)
The outdoor temperature setpoint frost protection
Installer
Frost protection rate %
When Frost protection is enabled then for this parameter
0% or any value less than the boilers minimum firing rate
represents the boilers minimum firing rate. 100%
represents 100% firing of the boiler.
Installer
Table 4.23 – Lead Lag Advanced Setting: Frost Protection Parameters
Parameter Comment Password
Enable Enabled or disabled
Allows use of warm weather shutdown.
Installer
Setpoint -40 to 266F (-40 to 130C)
If outside temperature is greater than warm weather
shutdown setpoint then it will cause the CH demand to
end. If there is no outside temperature then WWSD is
disabled.
Installer
Table 4.24 – Lead Lag Advanced Setting: Warm Weather Shutdown Parameters
Parameter Comment Password
Lead selection method Sequence order: Lead boiler is ordered according to
their LL – Slave sequence order or Modbus address if
this value is zero.
Measured run time: Lead boiler is ordered according to
their reported run time. If two have the same measured
run time, then either may be used.
Installer
Lag selection method Sequence order: Lag boilers are ordered according to
their LL – Slave sequence order or Modbus address if
this value is zero.
Measured run time: Lag boilers are ordered according
to their reported run time. If two have the same
measured run time, then either may be used.
Installer
Lead rotation time If this parameter is a non-zero time, then it is used to
trigger the rotation of lead boiler.
Installer
Forced rotation time If this parameter is a non-zero time, then it is used to
force the rotation of lead boiler if it stays on longer than
the time specified.
Installer
Table 4.25 – Lead Lag Advanced Setting: Algorithms Parameters
Parameter Comment Password
Base load common %
If set to zero, this parameter is disabled. For any non-
zero value, individual base load rates of each slave to be
ignored by the LL master’s routines and this common
Installer
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