joapysoe
07-10-2007, 09:00 AM
Hi All,
very new to this, infact my first ever post on a forum to be truthful. brief intro, I am not a fully fledged frosty but am an engineer offshore. and have been for a while.I have a general knowledge of the fridge cycle but not enough obviously.
I have an old air drier which has recently failed and was sort of hoping you guys could bail me out.
system was tripping on HP and this was due to lack of cooling through sea water cooled condensor, this problem was addressed but on re instating system there appears to be no flow accross either the expansion valve or liquid flow/moisture indicator sight glass. the gas inlet to the condensor is cool to the touch. there is a clear gas/liquid level in the condensor sight glass.
it appears to be that the gas flow is passing through the hot gas bypass valve thus shortening the circuit and missing out the cooling process and resulting in a very hot thermal tripped compressor.
I plan to change out the filter drier and if need be the expansion valve later but just wanted to ask if anybody has had any experience with a similar system and could pass on any snippets of info that could help. especially with regard to the hot gas bypass.
the system is R22 and my LP press is 3.5bar, normal running is 4bar. there is a level in condensor so have ruled out lack of gas so far. ooh and whe i close the hot gas loop the comp stops on LP.
any help much appreciated, bit of long one for a first post but hope it wont put you lot off.
very new to this, infact my first ever post on a forum to be truthful. brief intro, I am not a fully fledged frosty but am an engineer offshore. and have been for a while.I have a general knowledge of the fridge cycle but not enough obviously.
I have an old air drier which has recently failed and was sort of hoping you guys could bail me out.
system was tripping on HP and this was due to lack of cooling through sea water cooled condensor, this problem was addressed but on re instating system there appears to be no flow accross either the expansion valve or liquid flow/moisture indicator sight glass. the gas inlet to the condensor is cool to the touch. there is a clear gas/liquid level in the condensor sight glass.
it appears to be that the gas flow is passing through the hot gas bypass valve thus shortening the circuit and missing out the cooling process and resulting in a very hot thermal tripped compressor.
I plan to change out the filter drier and if need be the expansion valve later but just wanted to ask if anybody has had any experience with a similar system and could pass on any snippets of info that could help. especially with regard to the hot gas bypass.
the system is R22 and my LP press is 3.5bar, normal running is 4bar. there is a level in condensor so have ruled out lack of gas so far. ooh and whe i close the hot gas loop the comp stops on LP.
any help much appreciated, bit of long one for a first post but hope it wont put you lot off.