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I am getting Circuit A and B suction transducer failure alarms I've replaced both transducers. Ive got 5vdc from red to blk and from green to red at the senser.The pressure reads 0psig on the marquee and then switches to ''140 psig Fail'' when the alarm comes on.(Which is before the compressors can even start. Then after 2hrs the compressors start up on its own even though the alarm was not reset. I turned off at the disconnect nine identical rtu's units for filter changes. 3 of the nine gave me this transducer failure problem. 2 started back up after several alarm resets The 3rd is being much more stubborn. Also of the 36 scroll compressors at this sight 2 have been replaced due to a sputtering sound they make when they are shut off. 3 months later the replacement compressors are now sputtering. Keep in mind they are in a twin compressor arrangement. I am getting a reverse rotation alarm on one of them and then the unit shuts off. I reversed the phases for the hell of it and got the same result. Sure could use some feed back.

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Hey there, let's see if I can shed some light on your situation for ya. First of all, those noisy compressors are from the refrigerant feeding back through at shut off. Chances are, these are the compressors with the built in check valves and if they were replaced and doing it again makes you wonder if something is breaking them down. Also, if the are running at a real high pressure, the compressors may have enough pressure in them in front of the check valve to make them spin bckwards at shutdown. If it is two tandem compressors, I would vote for the latter. As far as the pressure xducers, I have never heard of that issue before after turning off and back on. I do know that the way carrier looks at its sensors is one at time and if one sensor is shorted, it will pull the voltage down and whichever sensor carrier is looking at at that particular time will show as a failure even though that one may not be bad. The way to identify this is to clamp on the pressure xducer wires with your meter and set it to min/max. If there is a short, your meter should go to zero (set on min). This will ell you there is a short somewhere, just up to you to find it. Let me know if this doesn't help or you need anything else

Posted on Jun 17, 2009

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