I have an old AC unit in my house, Heat Controller, Inc. model SU30-1B. I'm guessing about 20 years old. It works fine and cools sufficiently. However, the condenser unit vibrates quite visibly.
Qustions: 1. Is the vibration normal or an indication of impending failure? 2. If not normal, what should I look for?
Info: Motor is GE 1/5 hp model 5KCP, unit sits on Bramec Air-Pad on top of landscaping gravel. 5-bladed fan does not appear damaged.
Any input would be appreciated.