LAARS NeoTherm LC NTV1700 - Install and Operating Manual - 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
<Lead/Lag Master screen> Configure
button <Lead/Lag Master Configuration
screen> Advanced Settings button Left-
and Right-arrow buttons <Domestic Hot
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
<Status Summary screen> Configuration
button <Central Heat Configuration
screen> Left- and Right arrow buttons
<Modulation screen>
CH (Central
Heat)
Modulation
Sensor
This selects the sensor used for modulation and
burner demand for the CH loop.
<’home’ screen> Select a controller
<Status Summary screen> Configuration
button <Central Heat Configuration>
Left- and Right-arrow buttons
<Modulation screen>
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
<Lead/Lag Master screen> Configure
button <Lead/Lag Master Configuration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Outdoor Reset
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
<Lead/Lag Master screen> Configure
button <Lead/Lag Master Configuration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Outdoor Reset
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
<Status Summary screen> Configuration
button <Central Heat Configuration>
Arrow keys <Modulation screen>
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
<Status Summary screen> Configuration
button <Central Heat Configuration
screen> Arrow keys <Modulation screen>
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
<Lead/Lag Master screen> Configure
button <Lead/Lag Master Configuration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Outdoor Reset
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
<Status Summary screen> Configuration
button <Central Heat Configuration
screen> Arrow keys <Modulation screen>
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
<Status Summary screen> Configuration
screen <Pump Configuration screen>
Left- or Right- arrow buttons <System
Pump screen> Control Settings button