reach in freezer not pulling down. cap tube with 134a

[yamaha24]

reach in freezer. after vacum i charge with 1lb r134a (no name plate charge) pressure sitting at 5lbs and 15*F box temp. with the frost line all the way up to the compressor. hmm need more charge? i think so.. but then again im new to this refrigeration thing. was still pulling down but sooo slowly (cause of capillary tube system?) andi had to leave ill return toimorrow morn. no sight glass no high side access fittting. forgot to check comp amps when charging annnd worried about the frost line upto the comp. any advise would help my worries.

[Pascone10]

reach in freezer. after vacum i charge with 1lb r134a (no name plate charge) pressure sitting at 5lbs and 15*F box temp. with the frost line all the way up to the compressor. hmm need more charge? i think so.. but then again im new to this refrigeration thing. was still pulling down but sooo slowly (cause of capillary tube system?) andi had to leave ill return toimorrow morn. no sight glass no high side access fittting. forgot to check comp amps when charging annnd worried about the frost line upto the comp. any advise would help my worries.

You need to go back to the basics....

The temp is 15*!!!!
Need more detailed info to help.

However you need to be a pro member for me to help any further, sorry.

[VTP99]

134A or 404A ?

[yamaha24]

its 134a someone switched it, use to be mp39

[Joe Harper]

You really need to make some calls and find out how much of what refrigerant this unit holds. The majority of freezers in the U.S. use 404a. I do know that most equipment made for Europe uses 134. If you see frost, you need to get a superheat reading to determine if the evaporator is flooding.

[yamaha24]

ok thanks pascone ill go back to the basics. pfff im stuck there apparently!

[yamaha24]

i looked it up says 20oz. but i would love to make this work first thing without haveing to reclaim and recharge. its a cap tube system not tx.

[Joe Harper]

Is that 20 oz of r-12?

[yamaha24]

r401a sorry

[yamaha24]

i dont know what 401 is but its simillar in pressures as r12

[Joe Harper]

I would get some superheat numbers before I did anything else. Its always a good idea to install a high side port in the system. Most bullet driers are built so that you can insert a schrader stub in the end. Did you change the drier? What was the reason you had to vacuum and recharge?

[VTP99]

R401a is mp39

[Joe Harper]

i dont know what 401 is but its simillar in pressures as r12

401 is a replacement for r-12. 134 is more suited for high and medium temp applications.. I would rather put 401 back into the unit than 134..

[yamaha24]

i didnt change the drier i know i should of but it was soo tight and the kitchen was busy. it feels the same temp on wither side i dont think there any restrictions fixed a leak and charges it. what should my su[perheat be on a freezer. and i WISH i knew my high side pressuress

[VTP99]

Not to be a smart a$$ but start over and do it right or you will be going back a lot.

[Joe Harper]

Your superheat should probably be in the 10-15 range.
If I were you I would go ahead and plan on going back, changing the drier, adding access ports, and starting from there. You cant diagnose a problem without all of the vital information.

The best way to get it done is to go in as early as possible. Before any production starts. It is almost impossible to get things repaired during a lunch or dinner rush. If possible, dont be afraid to roll the freezer outside, if the option is available.

[yamaha24]

grrrrr i know i know i just dont want to blow the pound and pull the vacum again my scale sucks i dont trust it. ya 134 kinda confused me too i have always seen 404a in these kinda applications not that im very seasoned imma young apprentice to tell you the truth lol

[yamaha24]

thanks guys i plan on going in early to avoid the rush of 100 ppl running around my ladder ahh sigh bed time thanks again.

[VTP99]

Get that 134a out of the system. Wrong oil for that refrigerant. R 12 = mineral oil R134a = poe oil.

[pdrake65]

It sounds like this was a R12 retrofitted to MP39 (R401a). It is possible that you charged with the wrong refrigerant. If this is the case , evacuate into a SEPARATE recovery tank as this is now a mixed refrigerant and is usless to use in any system. Change the filter drier ,pull a good vacuum and charge with MP39. Good luck.

[Airmechanical]

should of stopped charging when frost exits evaporator



.

[jpsmith1cm]

grrrrr i know i know i just dont want to blow the pound and pull the vacum again my scale sucks i dont trust it. ya 134 kinda confused me too i have always seen 404a in these kinda applications not that im very seasoned imma young apprentice to tell you the truth lol

Do you not have a recovery machine?

Having accurate and reliable tools is job #1 in this industry.

Recover the charge, replace the drier with an 032CAPT and recharge with the correct refrigerant.

After completing that, if you are still having trouble, reoprt back with ALL pertinent data like suction pressure, superheat, head pressure, subcooling, box temp, ambient.

A poorly place afterthought. Have you checked the operation of the evap fan motors?