Unified Brands VENTILATION SYSTEMS - Manual (Page 10)

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9.Terminal Block #11 [TB-11] has three [3] pairs of
terminals. The first pair of terminals are low voltage
connections for the detergent low level probe. The
probe should be installed in the detergent container
so that it does not protrude above the top of the
detergent pump inlet strainer. [fig. #9] This is
intended to prevent cavitation of the pump and will
advise when the tank needs to be refilled. The probe
rods may be cut to facilitate a neat and effective
installation.
Fig 9
10.Terminal Block #12 [TB-12] has three [3] pairs
of terminals. The first pair of terminals are for
connection to the optional battery.