Original message
| tdub
 |  "frostback"
, posted Thu 25 Nov 10:39  
I have a reach-in freezer that I changed the compressor in ,since then the suction line keeps frosting up. I'm using 404 freon, sight glass clear. coil is clean
tdub
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Replies:
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| Freezone12
| "Re(1):frostback" , posted Sun 28 Nov 17:25
Frost on the suction line could be perfectly normal, depending on the application. If you are dealing with a residential AC unit, yes, this might idicate that you have a problem. On the other hand if you're dealing with an ice cream box, some frost on the suction line is perfectly normal.
Note: Add some armaflex during next visit.
_______________________________________
If it don't fit force it.
If it breaks it needed to be replaced anyways.
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| chiller guy
| "Re(1):frostback" , posted Thu 25 Nov 20:30
Sounds like a bit of overcharge. How was the new refrigerant charge measured (weighed in or other)?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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| Xenos
Webmaster 
| "Re(1):frostback" , posted Thu 25 Nov 19:11
What is the metering device and how much superheat are you running ?
Xenos.
The best way to escape a problem is to solve it.
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| | Superdave
| "Re(2):frostback" , posted Fri 26 Nov 00:03
Frost means the line is below freezing and nothing else. What temp is the reach in? If its running around 35 and the evaporator approach is 10 that means the refrigerant is running 25, if the system is running anything below 7f superheat , the line is below freezing. If the metering device is for anything other then the refrigerant your using it's either overfeeding or overcharged or over-capacity...
SuperDave
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| | Gary Lloyd
| "Frostback" , posted Tue 7 Dec 13:42
What are the following?
Condenser air in temp
Condenser air out temp
Saturated condensing temp (from P/T chart)
Liquid line temp near condenser
Liquid line temp near metering device
Evaporator air in temp
Evaporator air out temp
Saturated suction temp (from P/T chart)
Suction line temp near evaporator
Suction line temp near compressor
________________________
Gary R. Lloyd CMS
HVACR Troubleshooting Books/Software
https://www.merchantamerica.com/tmethod/
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