Can a Tekmar tekmarNet system have multiple outdoor temperature sensors?


Old 03-31-15, 12:13 PM
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Can a Tekmar tekmarNet system have multiple outdoor temperature sensors?

I have a Tekmar House Control 400 with a Tekmar TN2 Wiring Center 313 attached to the expansion terminal so that together they control the boiler, indirect DHW, and 8 hydronic heating zones. Currently there is one Tekmar Outdoor Sensor 070 connected to the House Control 400 "Out/Com" sensor terminal and it is working fine (outdoor temperature displays on all the termostats, etc). I see that the Wiring Center 313 also has an "Out/Com" terminal for connecting to an Outdoor Sensor 070. Can I connect a second Outdoor Sensor 070 to that empty terminal on the Wiring Center 313 and have two outdoor sensors on my Tekmar system (e.g. a sensor on the north side and a sensor on the south side of my house) and be able to view the temperature of either/both?

Note that I also have a Tekmar Gateway 485 connected to this system for remote monitoring/control.
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Old 04-01-15, 08:14 PM
Join Date: Jul 2009
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I think you could have it, but having a north and south sensor would likely confuse the system.
It may try to average the readings from the two sensors, and that would tend to affect the reset curve. Now, since the Teknet system does have indoor feedback it likely not have much impact.
But, on the other hand, having the system know that the sun is heating up on the south side might tend to prevent some overshooting. Depends of course on what your heat emitters is.

I would be curios to see what happens, do you have a spare 10K sensor any where from the system? It can be a slab sensor or a system sensor, all the same.

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