30HXC126 Econo Transducer Problems

[TroubledTech]

Hi Folks,
I have a customer with a 30HXC126 Carrier screw chiller. The chiller is not equiped with the optional economizer, however if does have the economizer pressure transducers, one on each circuit. These transducers are located on the motor cooling lines. I keep getting the same alarms on both circuits, economizer pressure transducer failure. I have checked 5VDC to the transducers, and the reading compared to a gauge. The suggestion from Carrier was to replace the main processor, PSI01. Well, I did, and the problem continues. The chiller is a 1999.

[Dallas Duster]

I fI can picture the transducer ,is located upside down on the motor cooling line.A 99 model it probably wouldn`t hurt to put some dielectric grease on the connection due to condensation on the line leaking down onto to packard style connection. I would also check the molex connector where it comes out of the control panel and make sure you have good tight connection there.

[TroubledTech]

I fI can picture the transducer ,is located upside down on the motor cooling line.A 99 model it probably wouldn`t hurt to put some dielectric grease on the connection due to condensation on the line leaking down onto to packard style connection. I would also check the molex connector where it comes out of the control panel and make sure you have good tight connection there.
Good Listener, you are absolutely correct about the location of the transducers. I have not tried putting any dielectric grease at the packard style connector yet, it is definitely worth a try. I have checked the mollex plugs and they are sound. I actually rerouted the wiring to the transducer on circ. A1 to get it away from the line voltage, and installed a ferrite core to help eliminate and possible RF. The problem is occurring on both circ's, it may run without fault for several hours, or, it man run for 5 mins.

[freonrick]

I even had a couple that I relocated the position of the transducer 90 degrees from where it was at. Also try taking the weight off of the cable plug at the transducer. Alot of machines had that transducer failure alarm when none of the components were defective. Just a thought maybe the transducer does not like the motor cooling solenoid valve clicking all the time.

[lirunaway]

I even had a couple that I relocated the position of the transducer 90 degrees from where it was at. Also try taking the weight off of the cable plug at the transducer. Alot of machines had that transducer failure alarm when none of the components were defective. Just a thought maybe the transducer does not like the motor cooling solenoid valve clicking all the time.

Good thinking, I had one years ago with the headpressure control valve on the entering condenser water line. When we corrected it the transducer problem went away as well. I bet the high SAT was causing the solinoid to continue opening.