TC903 controlling Cooling valve (0-10v) and Electrical Heater

Mo_Elshazly · ‎2022-01-19

Hello,

Could you please support if TC903 can control controlling Cooling valve (0-10v) and Electrical Heater (Digital)?

DavidChild · ‎2022-01-21

The TC900 appear to be either both proportional (0-10v outputs) or both outputs 2 position on/off.

An I/O module (0-10v in - digital output) with adjustable switching point could be used with the TC900 proportional version. An example here from a 3rd party supplier:

https://www.sontay.com/en-gb/products/io-input-output-modules/io-rm-relay-modules/

Or a high impedance relay could be used, the following KB indicates 250ohm minimum impedance, but may be best to aim for a coil impedance higher than this, note the pull in point may vary:

https://community.se.com/t5/Building-Automation-Knowledge/What-is-the-TC900-Series-thermostat-analog...

See Answer In Context

Harris69 · ‎2022-01-20

Exactly, I want that too.

DavidChild · ‎2022-01-21

Hi @Harris69

The TC900 appear to be either both proportional (0-10v outputs) or both outputs 2 position on/off.

An I/O module (0-10v in - digital output) with adjustable switching point could be used with the TC900 proportional version. An example here from a 3rd party supplier:

https://www.sontay.com/en-gb/products/io-input-output-modules/io-rm-relay-modules/

Or a high impedance relay could be used, the following KB indicates 250ohm minimum impedance, but may be best to aim for a coil impedance higher than this, note the pull in point may vary:

https://community.se.com/t5/Building-Automation-Knowledge/What-is-the-TC900-Series-thermostat-analog...

Mo_Elshazly · ‎2022-01-25

Thanks David for your feedback