R134A blockages.

[harryw]

Hi all,
Whats the cause of all the system blockages in R134A domestic fridge freezers etc that we keep seeing? Doesnt seem to be moisture. I read on some other forums that its due to 134 causing buildups in the capillary but the chap at Dean and Wood today told me he’s never heard of R134 blockages. Seems very common so many of you will know what I’m talking about I’m sure (!?) Whats the best thing to flush the capillary through with in these days of not being allowed to use R11? Also, whats the best (easiest?!)way to join copper pipe to aluminium evaporator pipe?

[BobHope]

Re: R134A blockages.

Hi Harryw,
welcome to the site,
R134A is prone to blockages more than the good old R12, to clear capilary blockages i use nitrigen and an application of heat from an electric heat gun, normaly gets them going, as to the joints use lockrings with the correct fittings.

hope that helps

Cheers Bob.

[harryw]

Re: R134A blockages.

Thanks for that Bob i’ll give it a go.

[admin]

Re: R134A blockages.

R134a is prone to blockages in the capillary mainly due to it picking up Oil vapour from the compressor. The drop in efficiency this causes, increases the working temperature of the oil which in turn accelerates the absorbtion by the gas.

With “sundries” paid out on contracts not equaling the actual cost of recovering the system, WHY do it. The cost of recovering and unblocking a system is way beyond the meagre sundry charge available. You’ll probably never recover your tooling costs!

Aluminium lokrings are available for evaporator joints and can be used to join to copper.

Kevin

[Author]

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