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LAARS Heating Systems
8.7.18 Lead Lag Leader Configuration
Then set up the Leader controller by going to the Lead
Lag Leader boiler and opening up the Lead Lag Leader
Configuration in that boilers Configuration Menu. Select
Leader Enable
Select OK and then Back out to the Main Menu.
Wiring Connections for Lead/Lag -
Now you can make the Modbus wiring connections
between the units. The controller in each boiler includes
two wiring terminals for the Modbus system, labeled
“MB1” and “MB2.” MB1 has the wiring connections to
the User Interface display on each unit, and MB2 is used
to communicate with the other boilers in the Lead/Lag
system.
To reach the controller, open the cabinet of the boiler by
turning the door lock and then opening the doors.
The wiring from the controller on the first boiler runs to
the controller on the next boiler. Use 22 AWG or thicker
shielded twisted-pair wire with drain. Two twisted pairs
or three conductors are needed. Wire A on MB2 of Boiler
1 must be connected to A on MB2 of Boiler 2, wire B on
Boiler 1 goes to B on Boiler 2, and wire C on Boiler 1
goes to C on Boiler 2. Repeat this wiring for any other
boilers in the system. Connect all of the drain wires and
ground the drain wire on one end of the assembly only.
Menu 24.
Enabling COM2 Menu
You will be prompted to sign in. This can be done by pressing
the ‘LOCK’ symbol at the top right
type in ‘LNT’ and press OK.
Then you can select Slave Enable.
Select ‘Enable slave for built-in Lead Lag Leader’ .
Then select OK
Then select a Modbus address (number) for that boiler.
Then select OK
Repeat on all boilers, keeping them in a sensible sequencial
order. ’ .
Summary of Contents for NTH
Page 4: ...LAARS Heating Systems...
Page 13: ...Page 9 NEOTHERM Boilers and Water Heaters 38 1 2 98 8 3 4 22 7 1 2 19 64...
Page 30: ...Page 26 LAARS Heating Systems Figure 21 Hydronic Piping Single Boiler Zoning with Circulators...
Page 86: ...Page 82 LAARS Heating Systems Parts Illustration 1 Jacket Components...
Page 88: ...Page 84 LAARS Heating Systems Parts Illustration 4 Internal Components Sizes 750 850...
Page 90: ...Page 86 LAARS Heating Systems Parts Illustration 6 Gas Train Components Sizes 600 850...
Page 93: ...Page 89 NEOTHERM Boilers and Water Heaters Notes...
Page 94: ...Page 90 LAARS Heating Systems Notes...
Page 95: ...Page 91 NEOTHERM Boilers and Water Heaters Notes...
