Leaks On Rack and Recharging Pt 1
Channel: MASTER TECHNICIAN MINDSET
Date: 05/03/2024

YT204

A FULL 9 HRS WORK DAY SHOWN ON THIS VIDEO. HAVE TO RETURN THE NEXT DAY TO CONTINUE THE LEAK SEARCH OF CIRCUIT B8. WILL UPLOAD PART 2 WHEN FINISHED

0:00 Intro
0:55 The Motor Room
8:04 Leak Searching
10:00 Valving off B8 Circuit
10:54 Time to add refrigerant
12:22 Receiver Level after 50 lbs
14:44 Leak on Meat Case

I received the work order for the Meat Display Cases not holding proper temperature.  Emergency Call, $300 NTE. 
Arrived onsite and checked cases, running in the 50s. Determined that these cases are circuit B1 of Rack B, which is running currently a 0% Receiver Liquid Level, and therefore this B1 circuit is the first circuit of the rack to start having issues during a loss of refrigerant scenario. Began to Leak Search the cases and all circuits on Rack B. Found that inside the Cremeria Service Cases(2-12' SMGV-12U Models, side by side), there is very high amounts of refrigerant. One of the 2 cases does not have a data tag. The 24' Service Cremeria is circuit B8 of Rack B, and is the location of the Major Leak on the Rack. Circuit B8 needs to be isolated and the system then charged up to get the liquid level up to correct operating condition. Approval Required.
 After the refrigerant is added, we have approval to proceed with determining the type of Leak in B8 and let Victor know the findings before proceeding with any major repairs.  Left the site and went to URI Katy. Picked up 200 lbs R407a. Returned to the job. Walked the store with Leak Detector again. Valved off Cremeria Circuit B8(store has emptied it at my request). I picked up an additional Leak in the far left Meat Case-Middle Cavity. (12' Hussmann M5-12EU case with three 4' sections.) The middle evaporator Cavity has small traces sensed by the H10. s
I had to unstock all the meat from this middle Cavity myself, and roll the meat into the walk in. Had to remove all the shelves in order to be able to pull the rear panel and expose the evaporator.  Evidence of oil from refrigerant present in drain pan(see pictures). Leak searched entire coil. Pulled it from the back wall for a thorough search.  Found nothing. Continued searching, and after a couple hours I found the leak. Is a tiny rupture on the bottom of the TXV outlet port in the 6 o'clock position, on the weld of the outlet port just before the distributor(see picture). Very hard to see or locate due to its size and accessibility. I pumped down  Circuit B1 Meat Cases, sanded the leaking joint really good with sand paper, and performed a resweating of the joint with Orange Flux coated solder. Leak checked it with pressure test-SEALED! I also replaced a C053s liquid Drier on the far right side 12' Meat Case, Right side Evaporator(See Picture), while I had the circuit pumped down which only took me 5 mins. The Drier was measuring a 4 degree delta T across it. Pressure tested and no leak present on the New Drier. Reopened Circuit B1 to the Rack and began adding the refrigerant. The rack took all 200 lbs to raise the liquid level to a suitable percentage. Running between 20-30% Receiver Level with all circuits open and running. Rack factory required charge is 510 lbs per the data plate. 
I did not get to start the leak locating on B8 Circuit Cremeria Service Case, but will return in the morning to work on that. 
Rack B is Recharged, no outstanding leaks, and all except B8 is operating normally at this time. Departed at 930Pm. Job Incomplete.