this  SL1506-ST controller controls the compressor and the electronic heater by detecting the water and the ambient

Temperature.It supports single compressor system and dual compressors system. It also has two control modes,

Constant temperature mode and ambient temperature coherence mode. All of these are switched by the

DIP.the HMI cooperation with the controller has a big range, including the SL109S, SL109T, SL108T,SL208. this

Manual is wrote for the SL1506-ST with SL109S.