I have installed a thermostat in my garage to control a fan placed on a shelf in front of the peak vent. The thermostat box has a 6V AA battery pack which switches control voltage to SS relay near the fan. The relay says "Silicon Power Cube" on it and is rated for 240V and 3A. I am using it on 120VAC. The control voltage is specified at 3 to 32 VDC. This system works perfectly. I have been using common 20 inch box fans. The problem is they only last a year or so and then they just stop working. Sometimes they fail over the winter when they never run. I have tried to troubleshoot the fans but can't find out why they have failed. The capacitors on the motor measure the correct value. I suspect there is something in the SS relay that is causing them to fail but I have no idea how. Are SS relays compatible with induction motors? I am on my fourth fan in about 5 years now and these fans usually last forever.
Thanks for any ideas.
Soartech