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  Have you ever wondered why your old refrigerator never needs service, gauges installed, and can run for 30 years that way maybe only needing an occasional cleaning of the condenser?  For crying out loud, utilities are buying these old energy hogs through some programs...
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As a primer to this post, I would not have done the evacuation quite this way, with multiple pulldown and isolations at 500 microns,  the goal was to demonstrate the characteristics of a system with moisture and to prove that “hitting 500 microns” is not...
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Every decision that a technician makes should be based upon a measurement. Sadly, many times the only decision is simply to make or not make the measurement itself. Technicians, contractors, or owners might realize months, years, or even decades later that they have been missing...
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