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Teckmar 360 - settings for boiler protection
I just finished installing a new radiant system. I have an old boiler that needs protection from return temp below 140F. I installed a 4-way mixing valve (ESBE) and a teckmar 360 mixing control.
In the manual of the Teckmar 360 it says that if its the only control unit then the boiler sensor should be placed on the supply side of the boiler, However, my main concern is that I want to make sure that the return water is never below 140F so it makes no sense to install the sensor on the supply side. There is an option to install it on the return side, but the control of the boiler uses a "boiler enable" function, and it is only recommended if this one of multiple controls of the boiler.
To test the mixing valve and the teckmar 360 I tried the two settings:
1. I installed the boiler sensor on the return side. It successfully adjust the mixing valve so the return temperature is always above 140F. However, it leaves the boiler always on. Even when the mixing valve is completely closed it still calls for heat. The boiler has a temperature protection setting that shuts it off, but it leaves the boiler pump always on.
2. I tried installing it on the supply side, and in this case it correctly controls the temperature that goes to the radiators, and turns off the boiler when enough heat is in the system. However, it does NOT protect the boiler from, as the return temperature goes far below the 140F limit set in the teckmar 360.
Any ideas on how to setup the system so that it BOTH protects the boiler AND shuts it down after the heat demand is met?
The only way I can think how to make it work is to pair the teckmar 360 with the teckmar 256 (boiler control). The 360 deals with the mixing valve to protect the boiler from low return temperature and to meet the mixing temperature of the system. The 256 reads the 'on/off' enable from the 360, and reads the supply temp of the boiler. With these two variables it turns the boiler on and off.
But there has to be a simpler and less expensive way to do this.... Ideas? Thank you.