Working on a 30 ton water furnace heatpump (water to water) that had repeated high pressure trips and then fried the compressor. Took out the bi flow drier and found the check valves ,on both ends, blown out of the drier. The rivets that keeps the plates in place were gone and the flat piece of metal that makes up the check valve was lodged in a reducer fitting and looked like an arrow head as it was blown into the reducer. This was an Alco drier. I took to my supplier who checked it out with Alco and said they had seen the rivet let go before but never the plate. Just woundering have any of you guys seen this happen. Unit is less than 2 years old using R410a . Thinkl I will replace with a Sporlan.
I'd recommend finding an appropriately sized field replacement. Your driers will need to be bi-flow, but think the appropriate capacity in biflow will be challenging to find. May have to consider separate check valves, and re-configuration of the refrigerant piping.
I have to say I have never been impressed with puny undersized factory-installed driers.
In my experience (all field) ive attributed a broken screen, check,drier block etc... to usually finding unit severely overcharged resulting in hydraulic pressure on all these components as a internal check on a biflow drier is what is forcing liquid through restricted block.
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Originally Posted by thermojohn
