View single post by tinkertech
 Posted: Wed Jul 1st, 2009 11:56 pm
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tinkertech

 

Joined: Tue May 12th, 2009
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 Was asked at work to look at this 20 ton two-stage system that is very unfamiliar to me,so I need some help. The first stage system only runs for about 30 sec. before the head pressure reaches it's cut-out pressure of 398 lbs. I replaced all filters and checked the fire damper to make sure it hadn't closed. Still does the same thing.

Found a bad leak on the second stage system(no freon in system) and fixed it. It will only run for a few seconds even though the discharge pressure never goes higher than 250 lbs. Also, it's started something new today. One of the 3.2 amp circuit breakers started tripping though I bothered no wiring for it. One of the wires comes from a transformer and the other two are connected to relays. I have 24 v. coming from transformer to C.B. and 24 v. coming to C.B. from one of the relays. I put my meter on one of the wires and read over 7 amps before breaker tripped. Is power supposed to be coming from relay to breaker as well or do I have a bad relay?