Laars MagnaTherm MGH1600 Installation And Operation Instructions For page 74

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9.H.18 L ag(Slave)Configuration(continued)
Select 'Configure'.
In the Configuration Menu, Scroll down and select
'Lead Lag Slave Configuration'.
Identify each unit (including the Lead unit) as a Lag
unit by turning on "Slave Enable."
You will be prompted to sign in. This can be done by
pressing the 'LOCK' symbol at the top right
LAARS Heating Systems
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 unit.
Then select OK
Repeat on all units, keeping them in a sensible
sequencial order. ' .