Posted by Crem on May 17, 2009 at 20:14:52 from (75.121.173.115):
In Reply to: Compressor question posted by jay-eye-see on May 17, 2009 at 14:32:12:
I have a 240 volt compressor and I built a small box with a two pole 30 amp relay/contactor and a timer. When I turn it on, the timer will always turn it off in an hour and I have to reset it again if I need to use it for a longer period. I have used this set up for years and if anything goes wrong with the compressor while I am away, it will always be turned off within an hour. I used a regular small 24 hour timer and pulled the tabs so that it would only stay on for an hour at a time all the way around the clock. The outlet on the timer supplies 120 volts to the relay coil to activate it so you do need both the 240 and 120 volts available in the box. I drilled a hole through the box so that the manual on/off knob on the timer would stick outside of the box. To start the compressor I just turn the knob to on. and it will time out in an hour. It could set it to longer periods if wanted. I can also turn the knob to manually turn it off if I want to.
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