LAARS NeoTherm NTV1000 - Install and Operating Manual - Manual (Page 64)

LAARS Heating Systems
Page 60
5. At this point, you have disabled the Master
function on one of the controllers. You will
need to repeat the process for each of the other
controllers in the system (except the Primary
Controller on Boiler 1).
Go to the Operator Interface on the next boiler.
Repeat steps 1 through 4 for the first controller
on that boiler.
6. Repeat the steps listed above for each of the
other controllers on the system. Disable the
Master function on each of them.
Job e – Set Up the modbus Control
addressing
(This is an individual function – do this for each of the controls
Use the separate Operator Interface on each boiler.)
Do this on any system with multiple boilers.
note – Do not connect the Modbus wiring yet. The
controls must be set up and addressed correctly
before the wiring is complete. If the wiring is attached
before the control Modbus addresses are changed,
there will be multiple controls with the same address,
and the system will not work.
1. When the system is operating under the control
of the Lead/Lag system, the Lead/Lag Master
needs a way to identify each controller in each
of the boilers. On a system with four boilers
there will be eight separate controllers. You
will need to give each of these controllers a
unique Modbus address. (Notice that this is
different from the name of the controller. We
set the controller names in a previous step.)
2. Power up all of the boilers in the system. It
will take a minute for each Operator Interface
to “synchronize” with its two controllers.
3. Start at the Home screen on the first boiler. See
Fig. 65.
fig. 65 – Home Screen
4. Press the Setup button in the lower right-hand
corner to go to the Display Setup screen.
fig. 66 – Display Setup Screen
5. Press the Modbus System Configuration
button. Figure 67 shows the Modbus System
Configuration screen.
Fig. 67 – Modbus System Configuration Screen
6. The first number on each line (01, 02, etc.) is
the Modbus control address. Let’s set up the
Modbus address for the first controller in the
line - the Primary controller on Boiler 1. Press
the top line – Boiler 1 Primary.
7. Press the Change Address button. You need to
know the installer-level password to change
the address, so the system will ask you to log
in. (For more information on the passwords
and logging in, see the section on “Using the
Touchscreen.”) Type in the installer-level
password and press the OK button.