Is there a way I can use two remote indoor sensors and average them or do I have to do four indoor sensors?
Honeywell TH800 averaging indoor sensors
fixerup
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You have to use a min of 4 sensors as I recall.
The number of sensors you use. Must have a sq rt that is a prime number.
sq rt of 2 is 1.4142, not a prime number. Can't use.
sq rt of 4 is 2, a prime number. Can use.
sq rt of 6 is 2.44, not a prime number. Can't use.
sq rt of 9 is 3, a prime number. Can use.
The number of sensors you use. Must have a sq rt that is a prime number.
sq rt of 2 is 1.4142, not a prime number. Can't use.
sq rt of 4 is 2, a prime number. Can use.
sq rt of 6 is 2.44, not a prime number. Can't use.
sq rt of 9 is 3, a prime number. Can use.
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I don't believe the TH can do what the TB can do. I could be wrong though.
Have you ever tried using 2 sensors on a TH.
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I will play with them again today, both the 10k and 20k sensors, and see if there is any problem.
Sensors must be in square numbers (e.g., 4, 9,
16, and so on)
Maybe only the tb822 is capable of two
Maybe only the tb822 is capable of two
I noticed that the TB8220 can use either a 10k or 20K ohm remote sensor (not necessarily in a mutli-sensor averaging setup) while the TH 8000 units can only use a 10K ohm remote sensor. Are there functional differences between a 10K and 20K sensor? Is a 20K sensor a bit more sensitive to temp change?
The TB uses a 20K for single remote sensor applications.
And the TH uses a 10K for single remote sensor applications.
The TB uses 2 10K's to average 2 sensors. So you would need 2 5K's with the TH to average 2 sensors(don't think you'll find 5Ks).
And the TH uses a 10K for single remote sensor applications.
The TB uses 2 10K's to average 2 sensors. So you would need 2 5K's with the TH to average 2 sensors(don't think you'll find 5Ks).
Thanks BT. In the installer manual for the TB it shows that the indoor sensor can be either 20K or 10K (installer code 0340 setting 3 for 10K and setting 4 for 20K). Does that not mean the TB can use either sensor in a single remote configuration? If so I just wondered what differences there are between the two?
Yes, that is the way I understood it too. But, why would someone choose one sensor over the other to use with the TB. My thought was the 20k may be more sensitive to temp changes and thus it responded a little faster.
A 20K is more sensitive/accurate. In that its resistance changes more per degree of temp difference.
But the stat doesn't control temp any different.
I think its a left over from/for lon communications. Since the TB may be replacing a small lon system. It can use the same 20K sensors. Or a lon systemcan be installed in place of the TB and use the 20K sensors.
But the stat doesn't control temp any different.
I think its a left over from/for lon communications. Since the TB may be replacing a small lon system. It can use the same 20K sensors. Or a lon systemcan be installed in place of the TB and use the 20K sensors.
That's what I thought. Thanks for confirming.
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2 sensors
OK here is how I used only two sensors.
I disassembled 2 10ks and then installed 2 into one in one location, thereby not having to have them spread across some walls (residential).
That is the beauty of the IAQ stat in that you can install one sensor and do temp averaging. The IAQ's stats sensor is used where as the TH 8's aren't in an averaging network.
OK here is how I used only two sensors.
I disassembled 2 10ks and then installed 2 into one in one location, thereby not having to have them spread across some walls (residential).
That is the beauty of the IAQ stat in that you can install one sensor and do temp averaging. The IAQ's stats sensor is used where as the TH 8's aren't in an averaging network.
Hmmm.
The TB install instructions says it doesn't use the on-board sensor for averaging. Just the remotes.
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The install instructions for the TH say the same thing.
The on-board sensor is not used to average. Just the remotes.
On the IAQ, it also says the on-board/internal sensor is disabled when using remote sensors.
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"Can be disabled"
It also can be used
This is a choice in the installers set up."
I would post a pdf but my "send to one note printer" is missing and I don't have the time to re-install it.
It also can be used
Qoute from install guide
"The thermostat will display a 50-50 average of the
temperature measured at the thermostat location and the
average of the temperatures measured at the remote indoor
sensor locations. In this case, the thermostat sensor still
carries a 50% weighting of the displayed temperature.""The thermostat will display a 50-50 average of the
temperature measured at the thermostat location and the
average of the temperatures measured at the remote indoor
sensor locations. In this case, the thermostat sensor still
This is a choice in the installers set up."
I would post a pdf but my "send to one note printer" is missing and I don't have the time to re-install it.
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