Laars NTV1000 - Maintenance; System Maintenance Procedures; Component Maintenance and Troubleshooting

LAARS Heating Systems
Page 86
Label Description How to Reach
Lead lag on
hysteresis
When the Lead/Lag function is enabled, the
control system will not re the boilers until the
temperature at the System sensor drops to the
Lead/Lag CH setpoint minus a hysteresis value
(normally about 10°F).
If Lead/Lag enabled –
<’home’ screen> Lead/Lag Master button
<Lead/Lag Master screen> Congure
button <Lead/Lag Master Conguration
screen>
Lead lag P
gain
This is part of the damping function
(“Proportional”) used when the controller
interprets the input from the System sensor.
<’home’ screen> Lead/Lag Master button
<Lead/Lag Master screen> Congure
button <Lead/Lag Master Conguration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Modulation
screen>
Lead/Lag
Slave Enable
Select Enable Slave for Built-in Lead/Lag
Master. Be sure this is turned on for each
controller in the system.
<’home’ screen> Select a controller
<Status Summary screen> Congure
button <Conguration Menu> Select line
for LL Slave Conguration <Lead/Lag
Slave Conguration screen>
Lead/
Lag Slave
Sequence
Order
Enter the position of this Slave in the sequence.
Be sure to enter this for each Slave in the
system.
<’home’ screen> Select a controller
<Status Summary screen> Congure
button <Conguration Menu> Select line
for LL Slave Conguration <Lead/Lag
Slave Conguration screen>
Lead/
Lag Slave
Modbus
Address
Each slave must have a unique Modbus address.
Be sure to enter this for each controller in the
system.
<’home’ screen> Select a controller
<Status Summary screen> Congure
button <Conguration Menu> Select line
for LL Slave Conguration <Lead/Lag
Slave Conguration screen>
Lead/Lag
Outdoor
Reset Enable
Enable = Outdoor Reset feature turned on <’home’ screen> Lead/Lag Master button
<Lead/Lag Master screen> Congure
button <Lead/Lag Master Conguration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Outdoor Reset
screen>
Lead/Lag
Outdoor
Reset
low water
temperature
This parameter is used as the normal setpoint
above the point where Outdoor Reset stops
adjusting for a higher outdoor temperature (the
Max. Outdoor Temperature value)
<’home’ screen> Lead/Lag Master button
<Lead/Lag Master screen> Congure
button <Lead/Lag Master Conguration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Outdoor Reset
screen>
Lead/Lag
Outdoor
Reset max
outdoor
temperature
If Lead/Lag is enabled, this is the maximum
outdoor temperature at which the Outdoor Reset
feature will be active.
<’home’ screen> Lead/Lag Master button
<Lead/Lag Master screen> Congure
button <Lead/Lag Master Conguration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Outdoor Reset
screen>
Lead/Lag
Outdoor
Reset min
outdoor
temperature
If Lead/Lag is enabled, this is the minimum
outdoor temperature at which the Outdoor Reset
feature will be active.
<’home’ screen> Lead/Lag Master button
<Lead/Lag Master screen> Congure
button <Lead/Lag Master Conguration
screen> Advanced Settings button/ Left-
or Right- arrow buttons <Outdoor Reset
screen>