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Posted on Jul 31, 2009
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What should refrigerant gauges read when charging walk in freezer?

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  • salex_bryan Jul 31, 2009

    Freezer being charged with R404, so what should it read? Thank you in advance, and for answering.

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christian nielsen

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  • Posted on Jul 31, 2009
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Depends on what kind of refrigerant its works, if is an old unit probably is charged with R12 or R22 newer ones work with R404 ;for R12 presures should be around 20psi on the low side and 160 on the high side ,for R22 about 60 and 250 and for R404 50 and 350 ;you have to look at the condensing unit tag to find out what type of freon its uses ,or look at the expansion valve at the evaporator coil.

  • christian nielsen Aug 01, 2009

    Between 45 to 60 on the low side but no higher than 350 on the high side ;make sure the condensing coil is clean and the evaporator too.

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How check superheat

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  • Posted on Feb 18, 2012
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Is that on a hot box or cold?

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