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Op did say multiple pressure switch trips.

When you completely fill the entire discharge line with liquid and leave no room for expansion......cant the pressures soar?

To my understanding this is why Microchannel units don't recommend pumpdown and why overfilled cylinders are dangerous

i would really think that the high pressure switch should have gotten this first. possibility that there is not one?

I guess ill expand on my remark.

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.

i think you are correct. im looking and cant find one.

so you can use some check valves and meter the refrigerant in both heat and cool. or use some check valves and use one drier to filter in cooling.

I'm not sure anyone makes a 607 biflow do they?

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.

oh 2 circuits. then you need a 607s in each circuit. use bushings to go from 7/8 - 1/2

30ton i think you need 2 - 607s in parallel

2 circuits , two 15 ton compressors

Originally Posted by thirty years

30 ton . 30 cubic inch (307)

How many circuits in that system? (Compressors)

Originally Posted by thermojohn

30 ton, or 3 ton? How many cubic inches is this drier?

30 ton . 30 cubic inch (307)

30 ton, or 3 ton? How many cubic inches is this drier?

Hydraulic liquid pressure is pretty powerful.

heatpump bi flow drier

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.