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Old 09-24-2011, 05:47 PM   #1
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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?

Thanks

Attached Thumbnails
Sensor Fell off Trane XE1000. What is it?-hp1.jpg   Sensor Fell off Trane XE1000. What is it?-hp2.jpg   Sensor Fell off Trane XE1000. What is it?-hp3.jpg   Sensor Fell off Trane XE1000. What is it?-hp4.jpg   Sensor Fell off Trane XE1000. What is it?-hp5.jpg  



Last edited by Krell; 09-24-2011 at 10:04 PM. Reason: It's a 1997 Trane, not a 1986 !!!
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Old 09-24-2011, 06:49 PM   #2
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Sensor Fell off Trane XE1000. What is it?


This sensor is TDL - Discharge Line Thermostat. There is a clamp that goes in the back of this sensor and in the liquid line.

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Last edited by JJboy; 09-24-2011 at 07:10 PM.
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Old 09-24-2011, 07:49 PM   #3
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Sensor Fell off Trane XE1000. What is it?


Just curious..your running a 25 year old heat pump..how is you electric bill?
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Old 09-24-2011, 09:53 PM   #4
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Sensor Fell off Trane XE1000. What is it?


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This sensor is TDL - Discharge Line Thermostat. There is a clamp that goes in the back of this sensor and in the liquid line.
Thanks! I guess I can clamp it back on. Can you point me to the Discharge Line and the Liquid Line in the pics? And does the DLT affect the defrost, or the CCH, or both?
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Old 09-24-2011, 10:02 PM   #5
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Sensor Fell off Trane XE1000. What is it?


This sensor is in series with the crankcase heater when liquid line reaches a specified temperature this sensor opens the circuit.

You have to connect this sensor in the small copper line just after the compressor
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Old 09-24-2011, 10:03 PM   #6
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by Master of Cold View Post
Just curious..your running a 25 year old heat pump..how is you electric bill?
I was wrong! It is only a 14 year old heat pump, from 1997.

I was thinking of the original pump, which would now be 25 years old. Thanks for mentioning that. I hope I can still edit my original post.

I need another vacation.

Last edited by Krell; 09-24-2011 at 10:05 PM.
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Old 09-24-2011, 10:14 PM   #7
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by JJboy View Post
This sensor is in series with the crankcase heater when liquid line reaches a specified temperature this sensor opens the circuit.

You have to connect this sensor in the small copper line just after the compressor
Do you mean I should connect it to one of those copper lines that look like an exhaust manifold, to the right of the compressor?
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Old 09-24-2011, 10:44 PM   #8
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Sensor Fell off Trane XE1000. What is it?


The sensor goes on the small line just after the compressor.
What is that other wire in the third picture? It is at the bottom of the compressor.
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Old 09-24-2011, 10:44 PM   #9
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by Krell View Post
Do you mean I should connect it to one of those copper lines that look like an exhaust manifold, to the right of the compressor?
Just after the compressor
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Old 09-24-2011, 10:45 PM   #10
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by Krell

I was wrong! It is only a 14 year old heat pump, from 1997.

I was thinking of the original pump, which would now be 25 years old. Thanks for mentioning that. I hope I can still edit my original post.

I need another vacation.
I didn't catch that either..wong model # for 1986
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Old 09-25-2011, 01:58 AM   #11
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by master of cold View Post
just curious..your running a 25 year old heat pump..how is you electric bill?
2011-1997=25
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Old 09-25-2011, 04:33 AM   #12
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by bobelectric View Post
2011-1997=25
2011-1997=14
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Old 09-25-2011, 08:39 AM   #13
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by Master of Cold View Post
The sensor goes on the small line just after the compressor.
What is that other wire in the third picture? It is at the bottom of the compressor.
The black wire that curls at the end, and has a red tip, is the wire to the Crankcase Heater, I believe. There is also a twig or a pine needle lying on the bottom, pointing to the vertical grey cylinder. Speaking of crankcase heater, even if I reattach the sensor to the liquid line, it won't change the operation of the heat pump until I fix or replace the crankcase heater, right? Assuming the only function of that sensor is for the CCH. Fortunately the hp works fine even with the sensor off and the cch wire broken.
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Old 09-25-2011, 09:40 AM   #14
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Sensor Fell off Trane XE1000. What is it?


You will want that working for the heating season.
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Old 09-25-2011, 09:42 AM   #15
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Sensor Fell off Trane XE1000. What is it?


Quote:
Originally Posted by bobelectric
2011-1997=25
Please read the whole thread before making fun of me.
OP originally said 1986 unit.

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