Original message
| BKraengel
 |  "Oops! Trane 2/4TEE"
, posted Tue 2 Sep 16:38  
All,
1. I have seen Field Wiring Diagrams for the Trane 2/4TEE with R jumpered directly to BK and with R connected to BK through an optional humidistat. From this I infer that applying 24V to BK puts the air handler in a low fan speed mode. Is this correct? Makes sense if this is the answer to high humidity. A lower fan speed means the room cools more slowly so the compressor runs longer and removes more moisture. OK, then why would it ever be jumpered directly to R? This means it's also in low speed in the heat mode. Is this a good thing? Anybody know what BK is doing?
2. This leads directly to the next question. Some of the new programmable thermostats have a DHM (dehumidifier) output It is energized with 24V when the hummmidity is above setpoint. Can this terminal be connected to BK for humidity control?
Bill Kraengel
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Replies:
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| TnNATE1412
| "Re(1):Oops! Trane 2/4TEE" , posted Tue 2 Sep 18:06
These are variable speed units, which yes will run in lower speed if the jumper is in place. It senses if you are running in cooling for lower speed for a few minutes. In heating it will default to what speed the heating is set to.
Question #2...I would not set the system up like that personally using the dehumid terminals. I use the jumper for high humidity problems and set the system to ENHANCED mode.
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