I was wondering if someone could shed some light on installing p-traps(and line sets) in suction lines on coolers/freezers.
Was helping Refrigeration Techs install piping(hard pipe) from new Bohn condensing units(New Bohn R404a and scroll comp med temp) to evap in walkin cooler. The condensing unit is at same level as cooler floor(below evap), approx 70 ft away horizontally.
The line set from evap runs up thru top of cooler then immediatly 90's horizontally to pipe run to condensing unit. The rise from evap to that 90 is about 30".
Not being an real experienced refer guy, had a few questions reguarding oil return to condensing units in general.
We installed trap in suction line down by evap. Was the trap nessasary? Im sure it didnt hurt installing it, just wondering.
I noticed the hard pipe runs were not pitched one way or the other, does that matter?
I also noticed the hard pipe seemed to me not very well supported, there were some sags in lines, supports for line sets was about every 10ft. Are the sags just another oil trap or detrimental to oil return on 70' run on 404a system w/scroll comp?
Is oil return/trapping w/newer refrigerants/compressors more or less important/critical than on older systems/compressors that would use r12/r502?
Thanks for any responses!