Used to be if the single speed fan motor stopped I could go in the attic and replace the capacitor, up and running. This newer vfd rig has the capacitor built in. Lasted 2-3 years. Replacement has 7 years on it. Fingers crossed.
Since AC equipment is mysterious to some folks I have normal calls such as. It’s got ice on it but not working, there’s water coming out of it, it is making noise I never heard before, it smells bad, it’s doesn’t feel cold enough, etc. I’ve often wished calls for AC service were like calls for heat service. They usually run like, “It’s cold! I used all the cover I got and am curled up in a ball trying to get some damn sleep. Get me some heat.”
No observation or opinion just the basic facts.
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Add a couple more words and it can be used in an “incredibly difficult congestive test”-
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I think you’re right that the PE should have understood what is meant by “frozen” with regards to refrigeration equipment, the meaning is not really ambiguous. If it was iced-up first of all the chief would have said "iced-up’ not frozen and second he wouldn’t have called in the first place.
The least ambiguous thing to say would have been “it’s not making cold”. Then the PE would have asked questions like,"Are the air filters and the condenser coils/HX fairly clean, is the compressor sweating? If so have you checked the charge? If low have you checked for leaks? What’s the suction and discharge pressures compared to the ambient temp and the compressor amps? Checked the temperature across the filter/dryer? If it’s a multi-stage compressor there are other questions. If it’s a centrifugal unit things are simpler. All these questions should be in the CE’s records before he calls the PE. This is basic engineering 101.
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i have no real reason to dislike vfd but i do. on a 40 hp fan what’s wrong with 2 or 3 speeds, whos going to '‘fine tune ‘’’ a vfd on a fan delivering that much air … is it a sales point … damn. !!
VFDs are fun but they don’t like being in the engine room/elements too much
VFDs do pretty well on a drill floor which is a harsh environment with the equipment being operated by people that take pleasure in seeing just how much abuse the equipment can handle.
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Two separate incidents.
First the accommodation A/C lost effectiveness and C/E shut it off because he believed the compressor was worn out. The fix was to flip the breaker back on later.
Second incident, several trips later involved a reefer compressor that had seized up and the breaker flipped.
In the second case of the seized up reefer compressor the chief had written that the compressor was frozen.
maybe let the stewards run the reefer? ha ha
I like the humorous yet knowledgable comments. CO2 compressors never seized up 