Thermo Technologies SMT 100 - Manual (Page 7)

6
2.3.2 TWO PUMP CASCADE SYSTEM
In this configuration will run when the tank temperature is below the
set point TT, and Pump will run (Pump will switch off) when rises
above TT.
1 Insert a link between “L” terminal of the PUMP relay and the common
terminal “C” of the AUX relay, (see cascade diagram).
2 Connect and (see cascade diagram)
3 Connect the mains supply to the terminals marked MAINS
4 Connect the earth to the pump.
Replace the “top” section of the control unit, and then fasten using the two
side fixing screws. The unit is now ready to be powered up.
When < TC: = OFF; = OFF
When > TC : If < TT:: = ON; = OFF
and - > If > TT:: = OFF; = ON