The sensing probes are reversed?

 

With the term 'low superheat' I am gonna assume you mean numerically high... as low charge in a conventional mechanical system.

Short of freon...
Too much airflow...
Non-condensibles...

Just throwing out a few to start the discussion along...

Really do not know much about the TAM7's.

 

The code for low superheat means exactly that- numerically low superheat.

With how these units are designed, it's difficult to achieve that code unless the blower fails, the door for the coil is off while running, or possibly sensor reversal.

 

Cold condensate (from the saturation location) dripping on the vapor sensor location.

 

Hmm.

While I don't work on a whole lot of these, I don't think that could happen without defying the laws of physics in some form. :grin:

I don't think the sensors are in a position to allow for that. I could be wrong, though, it's been a few weeks since I've looked at one.

 

I went to a training class on the TAM, and helped install exactly one. That's the extend of my experience with em, so I'm just guessing :cheers:

 

So then take your apparatus dewpoints and what have you elsewhere! :grin:

 

Load shed improperly wired or stepper got out of position and needed a power re-cycle.

 

Hey wait, if the answer is "not what I think", how can I, or any other person reading the question, possibly come up with the right answer?

 

Stepper motor got loose?

 

mixmatched indoor and outdoor unit.

 

Is the vapor sensor connected to the bottom of the pipe, reading a cooler-than-the-vapor oil temperature?

 

Following along

 

So low superheat doesn't mean nearing flashback?

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You mean flood back? In that case, yes. Low super heat means there's a higher chance of flood back

 

Sensors not giving the correct reading. I had that on a TAM8.

 

Stepper motor stuck, check valve stuck open, at indoor unit, blower too slow, dirty filter, r22/r410a dip switch is wrong, sensors bad, coil leaking liquid refrigerant and it's hitting the sensor causing a low reading,


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Ya oop floodback

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No one is close yet. I figured someone would have it by now or at least be close.

Low superheat means numerically low # on the "Tam" Trane air handlers. I'm saying its not what you think to try to get you to think. If it was obvious I would have never started this thread.

Think of EVERY possibility that would make that air handler "think" it had low superheat.

 

So it doesn't have low superheat at all ?

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So it doesn't have low superheat at all ?
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Mmmmm, the air handler is getting the right info from the sensors. But it's calculating the temp and sure enough, low superheat.

You Trane/AS guys are gonna smack yourself if I have to tell you the answer. No more clues from here on out.

 

Running in reversed mode without a call from control?

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Nope

 

The programming is wrong


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Nope

 

Gremlins

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I've had them before, but not on this one. Lol

 

We might be in for a long thread. All of you are "over" thinking this.

 

Switch set to wrong refer?

 

Nope

 

"Over"charged?

 

Nope

 

Compressor not running.

 

BAM! You the man bro!

Was doing a PM and pulled the disconnect for the condenser for cleaning and went down to check my air handler and was given this code because there was still a call for cool and air handler was running. No temp drop across coil so the coil was room temp. Thus no superheat. Glad someone was thinking. A lesson for all.

I'm excited you got it. Lunch is on me if you are ever in the upstate of SC. And a high five to go along with it. Congrats Cleter!!!

 

The thermostat is set below 70* and the return air temp is that low.

 

Had to register just to answer... Dirty coil

 

Lol. Glad you got in. This would give you low superheat but wasn't what I was looking for.