LAARS NeoTherm LC NTV1700 - Install and Operating Manual User Manual
Page 89
NeoTherm LC Boilers and Water Heaters
Page 85
Label
Description
How to Reach
Lead lag D
gain
This is part of the damping function
(“Derivative”) used when the controller
interprets the input from the System sensor.
<’home’ screen> Lead/Lag Master button
button screen> Advanced Settings button/ Left- or Right- arrow buttons screen> Lead lag DHW demand switch This indicates source of the aquastat signal used to control the Domestic Hot Water loop. <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons Water screen> Lead lag DHW has priority over CH Choose Central Heating priority or Domestic Hot Water priority. <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons Water screen> Lead Lag DHW priority override time If Domestic Hot Water has priority, this sets how long the DHW loop will continue to have control after the DHW demand stops. <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons Water screen> Lead lag DHW setpoint This is the setpoint used for Domestic Hot Water when the Lead/Lag system is enabled. <’home’ screen> Lead/Lag Master button button screen> Lead lag DHW TOD setpoint This is a different setpoint used for Domestic Hot Water when the Lead/Lag system is enabled and the input from the Time Of Day switch is “true.” <’home’ screen> Lead/Lag Master button button screen> Lead lag I gain This is part of the damping function (“Integral”) used when the controller interprets the input from the System sensor. <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons screen> Lead lag master enable/ disable One of the controllers must be set up as the Lead/Lag Master to supervise the Lead/lag system. Usually this is the Primary controller on Boiler 1. The master function must be disabled on all of the other controllers. See the section on “About Lead/Lag.” <’home’ screen> Lead/Lag Master button button screen> Lead lag off hysteresis When the Lead/Lag function is enabled, the control system will not shut off the boilers until the temperature at the System sensor rises to the Lead/Lag CH setpoint plus a hysteresis value (normally about 10°F). <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons screen>