Bradford White Brute MagnaTech BMGV1600 Installation And Operation Instructions Manual page 72

Page 68
Identify each unit (including the Lead unit) as a Lag unit
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 unit.
Then select OK
Repeat on all units, keeping them in a sensible sequencial
order. ' .