| http://www.w3.org/ns/prov#value | - After several contractors were called to diagnose a 50 ton York RTU, I was called in to assess the problem, the compressor is a semi-hemetric Copeland 4DK3-2500-FSD and the problem was the compressor was cooling fine and all pressure readings and temperatures were with in factory specs., and this may last for a few hours, days or just a few minutes and then the cooling capacity would drop and the
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