SUNFLOWER SR81Q - Terminal Connection

Instruction of SR81 Split Pressurized Solar Hot Water System
Page 8 of 59
or from hole ⑤, using a suitable tool (like knife) to cut the plastic of ⑤, and wire is
connected into housing from hole ⑤.
Note: wires must be fastened by fixing clamps on the position⑥.
3.5 Terminal connection
Note: before opening the housing! Always disconnect the controller from power
supply and obey the local electrical supply regulation.
 Input ports
 T1: PT1000 temperature sensor, for measuring the temperature of collector
 T2 ~T6: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and
pipe.
 HK-A,HK-B: on/off signal, ( HK and HR triggered or stopped synchronously, for boiler
heating controller)
 PWM: for high efficiency pump, connection see pump terminal connection diagram
 VFS: connect Grundfos flow sensor
 FRT: For rotary vane type electronic flowmeter