Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 62

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Select 'Configure'.
In the Configuration Menu, Scroll down and select
'Lead Lag Slave Configuration'.
Identify each unit (including the Lead/Lag Master) as a
slave by turning on "Slave Enable."
LAARS Heating Systems
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 master' .
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. ' .