Hey Guys and Gals. Working on an old (35) AAON commercial unit. Condenser fan motor .75 hp as per data plate cuts out on thermal after about 45 min.
Assume bad bearings even though amp draw not changing, install new with cap. Same pattern. Motor draws 5 amps under load which is under plate specs.I'm thinking someone be fore replaced propeller with wrong one and not enough air moving over motor to cool it. Head pressures do seem to be slightly high. Wondering if using 4 blade fan vs. 3 blade and pitch difference, etc. I'm thinking I'd like to increase air flow by 50% or so. Am on the right track?