Instruction of SR81 Split Pressurized Solar Hot Water System
Page 11 of 59
Wire connection with high efficiency pump
Signal wire 1 of high efficiency pump is connected with GND terminal of controller
Signal wire 2 of high efficiency pump is connected with PWM terminal of controller
Signal wire 3 of high efficiency pump is not connected with controller
Some pumps connections are available as above, for example:
Wilo Yonos PARA ST15/7.0 PWM2 M
Grundfos UPM3 SOLAR 15-75 130 CZA
Note:
1. High-efficiency pump with 0-10V signal only has 2 signal wires, connected to the
corresponding port GND, PWM1 of controller.
2. Blue wire not always represent for “GND” and brown wire not always represent for
“PWM”.
”PWM” from pump must be match for “PWM” from controller.
”GND” from pump must be match for “GND” from controller.
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