Question: I have a Magna 3 that I need to maintain a set temperature on a heat exchanger. What are my options?
Answer: There are two ways to configure on constant temperature mode based on where the pump is located. If it is on the return side after the heat exchanger, the internal sensor would maintain the temp and no external sensor would be required.
If on the supply side, an external combination pressure/temperature sensor (P/N 98404289) would be required to be connected to the analog input. To configure on the screen: Go to CONTROL MODE, select “Constant Temp”, under SETPOINT, input setpoint temperature, next go to SETTINGS and under Analog Input select “Function of analog input”, next “Constant temperature control”
When installing the sensor, the black wire is for temperature, power =brown, blue = ground and the grey unused wire is for pressure.