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New condenser, ancient evaporator

Hey guys, my boss had me install a new 15hp condenser and I have been having trouble every since. I do not know why the old unit died but it was from 1976 and it was time to get something new.

Here's the deal. Its for a warehouse sized walk in freezer running 507 with a target of a -20 degree coil. I have charged to the point of a full sight glass. My suction pressure hangs around 7 psi. I took super heat reading and had around 10 degrees. I can adjust the TXV to the point of 0 degrees superheat and get no rise in suction pressure. Subcooling is non existent as the condenser is sitting at 215psi and slightly above ambient. I'm getting a 1.5 degree drop across the evap coil. Fans are blowing and the evap is clean. Boss says the txv needs to be replaced but it seems to me I'm not getting any heat into the system. Boss throws parts at problems but I am trying to get a better grasp as to what is going on.

When I disassembled TXV it had a black chunky coating on all internal surfaces. Is it possible that I have clogged passes in the evap? Oil flooded evap? The liquid line is way to small after the liquid line solenoid which is about 2 foot from the TXV. This is how all my equipment is here. Pieced together ancient junk I am attempting to straighten out.

submitted by /u/Clinkityclankity
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Where do I send my employee to get trained?

Hello r/refrigeration users, I posted this earlier in the HVAC thread, and on of the users recommended i cross post it here. TIA

I own some restaurants in the midwest, and we’ve expanded to the point where our refrigeration needs are basically a full time job (maintenance, repair, installation of new units, etc). We have 11 restaurants full of commercial restaurant refrigeration of various types/ages/makes/models. This is not a franchise situation where it’s the same setup cut-and-pasted to different locations. Each of our stores serve different menus and are open different hours. We’ve tried a couple different solutions over the years including: 1.) maintenance contracts with a couple different service providers 2.) DIY maintenance (vacuuming compressors, cleaning coils) and then calling a repair company something breaks 3.) paying a retainer to a service company we like so that we get certain repair techs who know our gear as well as priority scheduling 4.) leaning on replacement instead of repairs Unfortunately I haven’t been satisfied with the results of any of these approaches. My managers are (rightfully) getting frustrated with equipment failures and having to hit the panic button to get everything moved out of a failed unit so as not to lose a bunch of product. Here’s my question: Where do I send a willing employee to get training in the repair of commercial refrigeration? I have a really great general maintenance person. No particular certifications in craft trades, but has a great mechanical mind, is good with troubleshooting, and is well liked by our store managers. On her own accord, she asked about learning how to repair our refrigeration. I’m all for the plan, I’m will to pay for her schooling, and pay her an hourly wage to attend part time while she continues working her job with us. She’s excited about the idea and so am I. My issue is that I can’t find a legitimate school/program/training course for her to enroll. The local community college has a program and I emailed with the department head, he flat out told me they focus almost exclusively on residential systems which makes sense. The big national manufacturers seem to have 2-3 day trainings but they seem to be very specific to whatever new models they have (again, makes sense). When I google I see these advertisements for “learn HVAC-r in 6 months online” which seems inadequate and also a bit scam-y. So I’m really scratching my head. We don’t have an existing tech with 20 years of experience for her to apprentice with, so that’s not really an option. She has an EPA 209 certificate from working in a body shop previously, but we know she needs get a 608. Sorry for the novel here, but any thoughts you folks have would be appreciated. Thanks!

submitted by /u/quackfrog
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Old GE profile Arctica

Sorry for the lack of info but I am at work right now.

My side by side GE arctica temperature Controls seems to have stopped working. The fridge is stuck at like 50 and freezer at 22 degrees. Still cool but not cold.

No matter how many times I adjust the temp, it stays at said levels. Everything else seems to be working fine. Help please!

submitted by /u/enunez81
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