Supermarket Refrigeration - Troubleshooting Walk In Freezer Running Warm (Electric Defrost Issue)

15 Step Guide

1) Air flow
Are the fans running
Is the honeycomb plugged
Is the coil Iced up

2) Temperature probe
Verified temp probes in a cup of ice water (33 Degrees)

3) Is the controller calling for refrigeration?
Did somebody put in a manual off or on.

4) Rack pressures
Discharge
Suction

5) Check Rack safetys
Oil safetys
High pressure

6) Check Condenser
is it plugged
Are the motors working
How many are out

7) Receiver level
Rule of thumb 20% summer
Rule of thumb 80% winter
20% at 70 Degrees
But above 0 is probably ok

8) Sight glass
Is it flashing
What is the load On the system. Hot day ? Cold day?

9) Rack filter dryer
Take a pressure Differential.
5 psi rule of thumb.

10) Rack circuit Ball valves
Are they open.

11) Liquid solenoid / suction solenoid / epr
Check function

12) Pressure at the cases
Does it match the case spec.
Rule of thumb, evaporator coil 10 degrees under the required temperature.
Is the liquid 100 PSI above the suction

13) Case hand valves

14) Case filter dryer
Take a temperature differential
5 - 6 degrees rule of thumb.

15) Superheat
Does it match the case spec.
Is the case close to temp.
Is the TXV screen clean.
Test the TXV

[al]

1. Very realistic walk in freezer you were lucky you could see the evap coil.
2. Again realistic no roof hatch key.
Common problems in the trade.
Thank you for your videos.

[sparkytech]

Can't get enough of your videos brother, need more

[giovannibrucher]

Your videos are what got me into supermarket refrigeration. I try making notes whenever you post, but i keep loosing the papers lol

[jkm]

I've been watching your videos for a while, I like the way you explain things and I find your content fascinating

[Growzarktrail]

Gendron HVAC-R is a refrigeration gangster!
Nice vid!

[王知容]

Hello friend, I am a cold storage manufacturer from China, nice to meet you

[SevenOneThree]

I had a very similar experience on a 460v rack changing contactors. I didn’t turn off all of the breakers surrounding the contactor. Luckily I was removing the mounting screw with a dewalt drill so when it arced out my extension and bit took all the damage. It tripped the main breaker for the rack. I took a day off after that, my eyes burned like hell from the flash..

[hectortorres]

Overstocking plus 9 times out of 100 yeah, employees leave the door open or bad door gaskets, unfortunately.
Fortunately.
But the video. And the process you go through, to good learning a tool.Thank you

[michaelfodor]

Your videos are great, always look forward to your content. Always great explanations and walkthrough. Keep it up!

[DonutsRGreat]

i like your meticulous troubleshooting steps. the electric defrost heaters they manufacture nowadays are cruddy. they die so often. I actually learned today that you could amp draw the line out on defrost contactor to see if you have a shorted defrost heater. If you know how many loads are on the circuit, and how many amps they draw, you can figure it out. had one reach in case with 3 heaters drawing 16 amps (those heaters usually draw 8amps), stripped the case, lifted the deckpan-- there it was... a mini explosion on the front heater

[marcoferreira]

Man what a great vid and step by trouble shooting. I install Vrf heat recovery units, and do some very little service in refrigeration but when you don't do it everyday its a bit of a task. Thank you

[frankg]

Thank you for sharing, got new subscriber

[spoonhorse]

Great video, I appreciate you for teaching and passing on what you know about this stuff. Helps us new guys learn a little extra.

[LukeJassi]

Superb channel! Great content
Uk subscriber

[joshuaricks]

Watched one video and immediately subscribed. Great video brother.

[Puffalupagus]

I have a video request. Can you possibly do a explainer/demonstration video on how to check oil pressure on a high/medium/low temp single circuit refrigeration system with a semi-hermtic compressor? It probably sounds dumb but I need to expand my commercial refrigeration abilities and this is one thing I don't understand and haven't done yet. I don't want to f up a customers equipment trying to "figure it out" if that makes any sense. Thank you either way.

[Shawn_RHVAC]

Not sure you noticed that the right side evaporator fan was inoperable and the unit is flooding back on the suction line!!

[teddyryan]

Could you go over that type of oil system on that rack?

[rocker]

Can you do ohm with the electricity on?

[justinkozel]

Did I see the rack said Hussmann Atlanta? Are you in GA?