||09-24-2011 05:47 PM
Sensor Fell off Trane XE1000. What is it?
I have a 1997 Trane XE1000 heat pump. I'm trying to find out what sensor this is, in the attached pics. It's the round silver thing, lying on the bottom of the unit, with the two blue wires coming out of it. Note that there is a concave groove on it which has some orange junk in it (glue?). There are all sorts of tubes within reach of it that it may have been glued to. I think I have shown all the tubes, in the pics, that it might have been attached to.
What I have found out so far, on the internet, is that this round silver sensor is probably one of two things : 1) the sensor which turns off the crankcase heater when the compressor is on, and attaches to the discharge line / tube. 2) the sensor which controls the defrost cycle, and attaches to the coil.
What / where is the "coil" in the pics, and what / where is the discharge line / tube ????
The model number from the actual plate on the unit is TWR024C100A2 .
The wire to the crankcase heater has broken off, you may have noted, in the pics, and is lying on the bottom of the left rear of the unit near the compressor electrical box. It's the black wire with the red cylinder on the end of it. Maybe it's related to the situation somehow.
The heat pump works fine. It was putting out lots of heat this past winter, and was cooling well this summer. I never checked down inside the unit until this Spring, and noticed the sensor and the CCH wire lying there. They may have been off for a couple years already! This Winter I had a block of ice about 3 inches thick on the bottom of the unit, for several weeks in a row, but the heat worked fine, with hardly any need for the auxiliary heat to come on.
I don't recall a lot of defrosting going on last Winter (in which the big cloud of vapor comes out of the heat pump), but I wasn't looking for it.
Can anyone tell me what this round silver sensor is, and where it supposed to attach?