LAARS NeoTherm LC NTV1700 - Install and Operating Manual User Manual
Page 86
LAARS Heating Systems
Page 82
Label
Description
How to Reach
CH (Central
Heat) has
priority over
LL (Lead/
Lag)
This controls whether a local Central Heat
demand has priority over the control asserted by
the LL Master, when this controller is enabled as
a slave.
If Lead/Lag enabled –
<’home’ screen> Lead/Lag Master button
button screen> Advanced Settings button Left- and Right-arrow buttons Water screen> CH (Central Heat) I gain This gain is applied to the Integral term of the PID equation for the CH loop. <’home’ screen> Select a controller button screen> Left- and Right arrow buttons CH (Central Heat) Modulation Sensor This selects the sensor used for modulation and burner demand for the CH loop. <’home’ screen> Select a controller button Left- and Right-arrow buttons CH (Central Heat) Outdoor Reset Low Water Temperature This parameter provides the CH Outdoor Reset setpoint when the outdoor temperature is at or above the maximum specified by the Max. Outdoor Temperature. <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons screen> CH (Central Heat) ODR (Outdoor Reset) Max. Outdoor Temperature This parameter determines the maximum outdoor temperature for the CH outdoor reset graph. At or above the maximum outdoor temperature, the water temperature setpoint will be at the low water temperature. <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons screen> CH (Central Heat) Off Hysteresis The off hysteresis is added to the CH setpoint to determine the temperature at which the burner demand turns off. <’home’ screen> Select controller button Arrow keys CH (Central Heat) On Hysteresis The on hysteresis is subtracted from the CH Setpoint to determine the temperature at which the burner demand turns on. <’home’ screen> Select a controller button screen> Arrow keys CH (Central Heat) Outdoor Reset Enable If outdoor reset is enabled, then the current outdoor temperature is used to determine the setpoint by interpolation using the CH Setpoint (or the CH Time-Of-Day Setpoint if the Time-Of-Day feature is on), the low water temperature, and the min. and max. outdoor temperatures. <’home’ screen> Lead/Lag Master button button screen> Advanced Settings button/ Left- or Right- arrow buttons screen> CH (Central Heat) P gain This gain is applied to the proportional term of the PID equation for the CH loop. <’home’ screen> Select a controller button screen> Arrow keys CH (Central Heat) Pump Control The CH pump (System pump – Pump C) can be turned on manually, or it can be set to operate automatically. If it is turned on then it remains on until changed back to Auto. In Auto mode it operates according to the demand sources listed above and the overrun time. <’home’ screen> Select a controller screen Left- or Right- arrow buttons Pump screen> Control Settings button