Compressor too large?

[subs]

I fitted a 1/5 Compressor to a 5′ upright freezer R600, Whirlpool AFG 8030. The problem is when you turn it on it gets very noisy and eventually trips the overload. Its as though there is a blockage but i have double checked everything and it isnt blocked. Do you think it could be a partial restriction or could the compressor be too large and the head pressure too high. Some advice from the more experienced refrigeration guys needed please.

Thanks

Subs

[admin]

Re: Compressor too large?

Hi

Yes this does sound like a restriction,did you change the drier when you fitted a new compressor ?

Also make sure the appliance is switched off for a couple of days with the doors open a bit to get the warmth inside which will help with clearing the restriction.

Restrictions are normally caused where the capillary joins the evaperator and it the coldest point of entry to the evaperator,warming this area up normally helps.

Bryan

[subs]

Re: Compressor too large?

Hi Bryan. I did change the dryer. Whats happening is a bit confusing as ive not had this before like this. It is doing it before ive even gassed it. If i run the compressor with the suction line disconected there is back pressure but the compressor still gets noisy, if i disconect it from the condenser, its quiet and seems normal. It was also ok when i disconected the capillary from the dryer. Could the compressor be too large for the bore and length of capillary causing too much restriction?, or even a faulty compressor.

Subs

[admin]

Re: Compressor too large?

Hi

Restricted system is still my quess

refrigerant is pumped at high pressure through the High side (condensor). it ithen goes through ok until it gets to the capillary which is attached to the drier attached to the condensor.
capilary then goes to the evaporator.(likely blockage is where the capillary joins the evaporator).At this point it should spray out like a water pistol(Hot refrigerant under high pressure sudenly released makes cold refrigerant)makes the evaporater cold.
It then goes through the evaporator then through the suction pipe back into the compressor to go back under pressure and return round the system again.

Bryan

[Martin]

Re: Compressor too large?

Hey Bryan!…..evaporator….easy mistake, gets me every time too! 😉 🙂

[subs]

Re: Compressor too large?

R600 Wrote
“It then goes through the evaporator then through the suction pipe back into the compressor to go back under pressure and return round the system again.”

Thanks Bryan for the explanation of the refrigeration cycle of a capillary system. I understand the basis of this. But as i said in my previous post im confused by the fact that i am getting pressure returning from the evaporator. With the high side connected to the compressor and the low side disconnected, if i put my thumb over to block the pipe( low side) i get a build up of back pressure. I know you can get moisture freezing at the point where the capillary enters the evaporator and warming the area allows the refrigerant to flow and the new dryer will soak up the moisture.
So, as i am getting back pressure, there is not a complete restriction. Could it be a partial restriction? and if so it would have to be something like wax build up and not frozen moisture as no refrigerant is in the system at this point? Thanks for your help. Subs

[admin]

Re: Compressor too large?

Hi

Refrigerant waxing up is possible to cause partial blockage,normally heating up gently where the capillary goes to the evaporater will soften it enough to clear or leave on vac overnight if you can if its close by.

Bryan

[Author]

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