Well, I had a call this week that started off as a basic service call that has turned out to 3 days of real wonder for me.
Original call was for a cooler that was off on Hi head but when I went up on the roof to check the remote condensing units I found all 3 freezer units flooding. One had gone off on oil failure and has since thrown a rod out of the compressor, I suspect from all this flooding. This is a new customer for me but the units have been running for just over 1 year.
I had tried to adjust the superheat on the ALCO TXVs but I couldnt get the flooding symptoms to stop so I dove in further. I Checked the distributor to make sure it has the correct orifice and then changed the TX vavle to Sporlan and I am still getting flooding symptoms. The only way to get the flooding to stop is to crank the valve in sooooo much that I am running at a low suction press for the gas(9psi). You can see by the info that I have provided that I am reading superheat but I have provided some cell phone pics that I think disagree.
Now for a little technical info.
Liq line temp 67f
suction line temp 0f at coil/16f at comp
Suction line size 2 1/8
Liq line size 7/8
TXV- Sporlan OVE 12 with pressure limiting head
Condensing unit -Cancoil model ACU1E031L5E052PO44
Evap -Cancoil model EHP107005B
This frosting on the suction line cannot be melted by hand.
Accumulation on distributor tubes.