Refilling R600a fridge (Urgent).

piotres · 10-19-2009, 02:40 AM

hello

That was topic about filling A/C in car but I didn't find anything about refilling fridge .

So I must refill R600a fridge made by Whirpool, looking like this : (it's fridge/freezer) :

I have R600a . Shrader is already brazed to suction port . On label there is 0.054kg of gas wrote . What suction pressure should have freezer when it's tunned properly ? What are other factors saying that fridge is tunned well ?

That's bit urgent ..today evening I must refill it

Thanks for all help !

Regards

yngndrw · 10-19-2009, 03:55 AM

Can you not just weigh the gas in ?

tiborrr · 10-19-2009, 05:25 AM

Borrow a 2000g 1g scale laboratory grade weight (cheap, around 20-30€), place the container with R600a on it, calibrate it to 0 and charge to -54g.

bartx · 10-19-2009, 05:55 AM

Even standard electronic kitchen scale will do the job. My is up to 5kg, 1g step.

piotres · 10-19-2009, 06:00 AM

I don't have any electronic weight, plus not all refrigerant is out of system (frigde have very tiny leak, gas leaks throught 4 years to stop working of fridge) . So I must find another way of tuning it..

august123 · 10-19-2009, 06:42 AM

did you thought about that R600a is flammable/ explosive? Just Refilling is bad way, maybe leak is on suction side. Those freezers are at low suchtion pressure/ maybe in vacuum and O2 can get in system

.
Getting this system leak free, testing with nitrogen and then a good vacuumpump is required. But when leak is in evaporator, you simply throw it away

piotres · 10-19-2009, 08:31 AM

OK I know August, but can You tell me way how to refill it without having weight ?

ruffus · 10-19-2009, 09:39 AM

just do it the same as one of the single stages we build. there should be a 4c to 12c superheat but subcooling will be different if it is a static cooled condensor if it is not then just charge the same as a single stage system. this is how i have done fridges before but like august said u should really try and find the leak

piotres · 10-21-2009, 05:24 PM

Finally I rent weight from neighbours (electronic) and put a 54 grams of R600a like sticker says . But that time pulldown time was really slow, and from fridge was comming not nice sounds (hissing, buzzing) ...just like too little refrigerant . So I add 10 grams more and till now all works fine

.

Thanks for help.

piotres · 10-25-2009, 04:37 AM

Hi

After 3 days fridge is out of gas again so I guess leak is not small ...

Till now I've found one small leak :

Can anybody have an idea if I can throw away that piece of alu pipe which is comming inside fridge (I think yes) wall and connect condensor outlet directly to drier ?

Because I don't know in what way I should braze steel to alu, if I throw away that alu I'll connect steel condensor with cooper drier using cooper pipe .

Am I right ?

wdrzal · 10-25-2009, 05:14 AM

The places where you need to remove/repair the aluminum ,use a double flare on the aluminum to reconnect.

august123 · 10-25-2009, 05:51 AM

maybe some sort of slhx inside fridge/freezer?

tanguintel · 10-25-2009, 10:39 AM

I thinks is not aluminium is a steel juste remake a braid , is not slhx , this tube going under your fridge or in the side is a sort of desuper .... I thinks that you little to connect(bind) the condensseur with the dezydrateur directl (reverso translate sorri ^^ )