Originally Posted by
Silverspur
Next, the thermostat was re-located to be directly, and I mean directly beneath the main air return. The reason for this is in the summer heat, the XL950 would show the room temperature to be in the mid 80's when the room was acutally in the mid 70's. This would cause the system to run and never shut down. Nothing would solve this - recalibartion cannot compensate for this big a difference, spacing the thermostat off the wall three inches did not help, nothing seemed to solve the problem, and it read incorrectly only in when the system was on and when it was very hot outside.
The installer was informed by the Trane rep that there is a design issue with the XL950, and it is known by Trane that the thermostat will read erroneously by a substantial amount due to self heating. The electronics in the t-stat heat up and cause the ambient room temperature sensor to read high from the internal heating. I actually measured the back of the XL950 to be as much as 115 F with an infra-red thermostat. It is hot to the touch.
Anyway, the Trane rep says Trane knows about this and says to mount the XL950 directly in the return airflow so the ambient room sensor has room air moving over it at a good volume. When the installer asked the Trane rep when a fix would be available for this, the rep suggested there would be no fix until the next model came out, and the home owner would have to purchase a new one.
So, Trane has a design problem and I am stuck with an expensive thermostat that does not work properly, and Trane says I have to purchase a new one if and when they come out with a new model... Thank you Trane, nothing like customer service and standing behind your product. It only took about four months to get this information out of them by the installer.
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The fix for your problem is to mount a remote sensor directly below the 9500. This will now give you accurate temp reading at the stat. I'm suprised the FSR is not aware of this fix.
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