[Hai-users] Creeping thermostat calibration?

[Info | CSI]

A good way to troubleshoot thermostats (if you have more than one on site), is to switch them around to determine if the problem is with the device, wiring, funace output or the environment. The likelyhood of three stats "drifting" is unlikely. How does the same thermostat perform in a different environment or home? It sounds like you're doing everything right.

Paul


> Has anyone else noticed the calibration on their RC-122's "creeping"?
> 
> I've had about six I've had to adjust the calibration on, a year after
> installation. Four of them, I've had to continually adjust -- once a month,
> it seems.  On three, I've gone from 30, to 28, to 26, to 23 (same
> household).  I've double checked with three digital thermometers, including
> a Fluke.. All three thermometers are showing the same temp (to the tenth
> degree)... The HAI thermostat is consistently too high (and thus keeping the
> A/C on too much).
> 
> Weirdest thing.  It's like they're drifting...  I haven't seen this on any
> of the RC-112's, which is even stranger, since you'd expect to see the same
> behavior since they're basically the same 'stat.
> 
> 
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