12 Ton Trane Situation

BUCKHAVEN

12 TON,2 STAGE TRANE ...... RUNS FINE, CYCLES FINE FOR 2-4 DAYS THEN PUKES OUT . CONTACTOR IS IN BUT 1ST OR 2ND STAGE RELAYS ARENT ENEREGIZED ... SHUT POWER TO UNIT ,WAIT 5 MINUTES AND EVAP FAN COMES ON THEN 3 MINUTES LATER 1ST STAGE,THEN 3 MINUTES LATER 2ND STAGE FIRES AND ALL IS WELL FOR 2-5 MORE DAYS ... BOARD HAS BEEN REPLACED AND PRESSURES ARE A-0K... ANY COMMENTS???????????????PLEASE??

mdshunk

I wish there were a little more diagnostics on some of these Trane RTU's. They just lock out, and there might be a 1/2 dozen things in the lockout relay circuit that could have tripped it. I've found that the current sensing relay for the compressor is in the lockout circuit on many, as well as a compressor windings thermostat. You'll really have to install "tattle tales" on each item in the lockout circuit and let 'er run for another 2-5 days and then look and see what shut her down. I'm kind of a Trane guy, myself. Maybe with the model # and I'd pull the print and puzzle on it a little more.

(does this unit have an economizer? Could the enthalpy controls be poorly set?)

BUCKHAVEN

Will Grab Mdl # Tomorrow And Exact Specs....thanks, Thanks