don't have that controller, but per the manual...
switch 1 is ON for 12V, OFF for 24V, I would assume you have 12V.
switch 2-3-4 are....
off-off-off for SLA/AGM batteries.
on-on-off for Lithium w/ 14.3V absorption
on-on-on for lithium w/ 14.4V absorption
switch 5 is ON to enable automatic equalization (flooded lead acid only, do not use this on gel or SLA or lithium).
the ... settings are for various voltages for flooded, see page 38 of the above PDF. IF you have 12V flooded batteries, I would probably use the off-on-off setting.
the FACTORY setting from Samlex was switch 1 on, all others off, but the installer may have chosen a different option, depending on your battery type.