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Thread: Lowering maximum temperature
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16-07-2021, 05:19 AM #1
Lowering maximum temperature
I got a freezer that can go to maximum -15 degrees now.
Would it be able to go to -20 degrees if I change the thermostat max settings?
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16-07-2021, 07:13 AM #2
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Re: Lowering maximum temperature
Hi
Main thing is that .
But to give you right answer need to know more about your system
Type of refrigerant and compressor.
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16-07-2021, 10:26 AM #3
Re: Lowering maximum temperature
.
Minus 15 for a freezer is unusual.
Minus 20 is more like the normal.
Are you sure this is a freezer?
Rob
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16-07-2021, 01:01 PM #4
Re: Lowering maximum temperature
Did it go to lower temperatures before now?
What is ambient temperature around the freezer?
Has anything changed since first installation?
Is compressor running still at -15 or is thermostat still calling for compressor?Brian - Newton Abbot, Devon, UK
Retired March 2015
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17-07-2021, 06:09 PM #5
Re: Lowering maximum temperature
No, it did not go below -15.
Compressor model: L76CZ1
Refrigerant: R134A
Understand that R134A is not able to go to lower temperature. Must be R404A, correct?
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31-07-2021, 09:56 PM #6
Re: Lowering maximum temperature
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If it is this comp then Minus 23 evap temp equates to about minus 13 case temp.
https://www.womacool.com/productinfo/284992.html
So if it is at minus 15 then you are at the limits of the comp.
Rob
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18-08-2021, 08:07 PM #7
Re: Lowering maximum temperature
On 134a comp would need to run in vac on suction to achieve -20, which is never a good idea unless it is a special design, for low temp should be 448A, 449A, 407A or F, but on a 134a system may well require different pipework sizing, would probably be better to replace with a properly specified system.