LAARS NeoTherm LC NTV1700 - Install and Operating Manual - Manual (Page 62)

LAARS Heating Systems Page 58
Job E – Set Up the Modbus Control
Addressing
(This is an individual function – do this for each of the controls
Use the separate Touch Screen 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 Touch Screen to
“synchronize” with its two controllers.
3. Start at the ‘home’ screen on the first boiler.
See Fig. 63.
Fig. 63 – ‘home’ screen
4. Press the Setup button in the lower right-hand
corner to go to the Setup screen.
Fig. 64 – Setup Screen
5. Press the Control Setup button. Figure 65
shows the Control Setup screen.
Fig. 65 – Control Setup 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 – NeoTherm LC 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.”) Press the padlock symbol in
the upper right-hand corner of the screen, then
type in the installer-level password and press
the OK button.
8. Press the Change Address button again. The
system will present a screen that lets you
change the address.
Fig. 66 – Changing Modbus Address
9. Table 13 shows how the Modbus control
addressing should be set up. The system is
simple, but it is important to only use the
correct address listed in the table. Do not
use any other address than the one listed in
the table for the control you are addressing.
In this example, the correct address for the