Tecumseh AEA4440AXA HI TORQUE COMPRESSOR

[dirtking]

OK so most of my 30 year experience with HVAC has been in large commercial AC units so this little Tecumseh AEA4440AXA R-12 under counter hi temp refer box has got me stumped. Unit pulls down, satisfies & shuts down fine. Off cycle duration is about 12 - 20 minutes. When stat calls for cooling compressor won’t start (cuts out on klixon protection) until the HI - LO press differential is less than 22 psi. Compressor is new & all windings ohm out good, changed overload, start relay & capacitor with no change. By the time compressor is able to start the box temp is too warm. My question is this: With these small high torque compressors, what is the typical HI - LO pressure differential compressors can overcome @ start? Thanks Guys!!

Jim

[ReferTroop]

I would suggest calling tecumseh for the exact pressure but to me that sounds typical at 20 -30 psig. I'm thinking partially restricted cap tube due your pressure should have equalized within the 12-20 minutes off cycle. I can't say that for sure but seems to me.

Joe S.

[hydra]

12 minutes is plenty of time for that unit to equalize. I would suspect a restriction also. What are your pressures?

[craig1]

The high torque models can easily start against a 200 psi differential. They don't need any equalizing time.


What is the supply voltage while it is attempting to start?

[pecmsg]

Heres the tech sheet for that pump.

http://www.tecumseh.com/en/united-st...?pdf=datasheet

Whats the SH when running?

[creeker66]

This unit isn't on an extension cord or anything like that is it?? that will create a voltage drop...

[len]

Make sure it's on it's own circuit,worked for coca cola for years,had them baby's all plugged in along with Pepsi coolers and what not,that's a 1/2 hp compressor any kind of voltage drop will cause that.

[hydra]

We need more details. Is this a single door or multiple door cooler? Model? Manufacturer? Etc.

[dirtking]

The high torque models can easily start against a 200 psi differential. They don't need any equalizing time.


What is the supply voltage while it is attempting to start?

Thank you for sharing. I assumed the hi torques didnt need much equalizing but didnt know so now I will check the integrity of my voltage. I know I have 116 VAC static (no load) but will check on load integrity next.

Thanks again!
Jim.