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Rev 2.1
This parameter represents the lead lag firing rate when frost protection is enabled.
5-19 Lead Lag Advanced Setting: WWSD Parameter
5-19.1 To Enable Or Disable Lead Lag WWSD
Configure → Lead Lag Master Configuration → Advanced Setting → WWSD → Enable Textbox (Default: Disabled)
• Select Disable to disable WWSD
• Select Shutdown after demand ended to allow any current CH demand that is present prevents WWSD from
becoming true
• Select Shutdown immediately to allow WWSD to become true immediately causing CD demand to end
5-19.2 To Change WWSD Setpoint
Configure → Lead Lag Master Configuration → Advanced Setting → WWSD → Setpoint Textbox (Default: 90⁰F)
• Type in desired temperature between 32⁰F and 240⁰F (0⁰C and 115⁰C)
When the outdoor temperature is greater than Warm Weather Shutdown setpoint then it will cause the CH demand to
end. If there is no outdoor temperature then WWSD is disabled.
5-20 Lead Lag Advanced Setting: Algorithms Parameter
5-20.1 To Change Lead Selection Method
Configure → Lead Lag Master Configuration → Advanced Setting → Algorithms → Lead Selection Method
Textbox (Default: Lowest measured run time)
• Select Sequence order to sequence the lead boiler according to their sequence order or Modbus address if this
value is zero
• Select Measured run time to sequence the lead boiler according to reported run time.
5-20.2 To Change Lag Selection Method
Configure → Lead Lag Master Configuration → Advanced Setting → Algorithms → Lag Selection Method Textbox
(Default: Measured run time)
• Select Sequence order to sequence the lag boiler according to their sequence order or Modbus address if this
value is zero
• Select Measured run time to sequence the lag boiler according to reported run time.
5-20.3 To Change Lead Rotation Time
Configure → Lead Lag Master Configuration → Advanced Setting → Algorithms → Lead Rotation Time Textbox
(Default: 1h0m)
• Type in desired time
This parameter is used to trigger the rotation of lead boiler. Note the rotation does not occur until the next heat
demand cycle.
5-20.4 To Change Forced Lead Rotation Time
Configure → Lead Lag Master Configuration → Advanced Setting → Algorithms → Forced Lead Rotation Time
Textbox (Default: 24h0m)
• Type in desired time
This parameter is used to trigger the forced rotation of lead boiler. Action is forced and is independent of the heat
demand cycle.
5-21 Lead Lag Advanced Setting: Rate Allocation Parameter
5-21.1 To Change Base Load Common Rate
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