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Thread: Glass door freezer superheat
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16-06-2011, 01:15 AM #1
Glass door freezer superheat
Just wondering what the rule of thumb is with glass door freezer superheat. I have seen cases specified at 5k and flood back badly. I was told 10k but wanted to hear others opinions.
Thanks
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16-06-2011, 01:36 AM #2
Re: Glass door freezer superheat
Usually 5-7K yes, but if the compressor is situated lower than the blower coil remember a trap higher than the coil to prevent flooding. (asuming the coil is clean and optimal airflow is achieved)
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16-06-2011, 06:31 AM #3
Re: Glass door freezer superheat
When you say flood back badly, is it just ice on suction of compressor, or is there a measured value of low/no superheat combined with other indicators such as cold discharge temperature and noises from compressor? As suggested in previous post, SH 5 - 7 DegK is normal, but often results in frost at the compressor - sometimes mistaken for floodback. Typical freezer systems normally have suction accumulator to provide some degree of liquid protection.
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17-06-2011, 02:11 AM #4
Re: Glass door freezer superheat
Not sure whether this rack has an accumulator. Thanks for your input I will try and lower all superheat on all the freezers and see how the system runs.
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17-06-2011, 04:15 AM #5
Re: Glass door freezer superheat
Hi Fridgy Dave.
do a forum search on superheat, there is a lot of discussion on subject to read.
magoo
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17-06-2011, 05:43 AM #6
Re: Glass door freezer superheat
Thanks magoo I'll check that out
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17-06-2011, 08:14 AM #7
Re: Glass door freezer superheat