Trane HP AUX Problem

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  #81  
Old 05-30-12, 05:30 PM
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OMG: Back from the dead after 4 years

Jay,

Hope you can help me again. My heat pump has been doing great until last weekend. Wasn't keeping up with the cooling. Called HVAC service and it was 1 lb low on refrigerant, so they are doing a leak test next week.

Bigger question is my electric coil backup elements are energized while the A/C cool is running. Do you have any suggestions on diagnosis? I kept wondering why the service tech said all pressures,etc were fine on initial startup, but a few hours later, warm air. I was pulling 40 amps at the handler, which led me down this path.

He temporarily disconnected the element, but I would like to try and fix myself to save some labor hours next week when he comes back to do the leak test.

Thanks a million
 
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  #82  
Old 05-31-12, 02:33 PM
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More digging

Ok, I dug into it. I am getting 24V at the EIM module at AUX 2, which is like the unit is wanting to be in defrost mode EVEN though the unit is in COOL mode.

Not sure why it would be doing this?
 
  #83  
Old 05-31-12, 04:08 PM
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Remove the wire from AUX2 and then check voltage to confirm if it is a signal from the HP or if it is from the EIM
 
  #84  
Old 05-31-12, 04:49 PM
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Good point. I disconnected the AUX2 wire from the EIM. While in cool mode, the EIM AUX2 pin was 0V, while the disconnected wire from the EIM which goes to the HP is 24V. HP board bad?
 
  #85  
Old 06-01-12, 04:12 PM
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I took the wires off the air handler for W2 and W3. The 24V defrost wire at the outdoor HP is the one energized. (black HP wire). Why would the outdoor HP be sending defrost signal?
 
  #86  
Old 06-01-12, 04:43 PM
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Bad defrost board would be a good guess or a bad temp sensor.
 
  #87  
Old 01-07-14, 04:03 PM
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Quick question

Jay,

Any reason why option 0176 for the iAQ thermostat does not have an option for 3 stages of heat? I get 0,1,2,E. I had previously disconnected the wires at the AH from the W1/W2/W3 terminals because the electric strips were coming on in the summer.....

I have still not put a new defrost board in, but when I hooked the wires back up to the system, the 3rd stage option went away. How can I get this option back?

Thanks
 
  #88  
Old 01-07-14, 05:23 PM
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Jay,

I went into the installer menu and ran system tests for the heat. I had all options which included the 2nd stage of backup heat and all strips fired up.

However, menu 0176 still does not give me the option for the 3 stages.....
 
  #89  
Old 01-07-14, 06:51 PM
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When it's set up for HP mode, THere's only Aux 1 and 2. ,
 
  #90  
Old 01-07-14, 07:11 PM
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I guess that is my question. I have aux 1 and aux 2 wired at the EIM module. It seems the aux1 terminal is the only terminal getting 24v in emergency mode. The aux2 never gets the 24v signal....aux 2 is tied to w2/w3 at air handler.....
 
  #91  
Old 01-07-14, 07:29 PM
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Aux2 will come into the picture on Emergency heat mode as needed.
 
  #92  
Old 01-07-14, 07:29 PM
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ok. thanks for the help
 
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