I am new to this site and would like to take this opportunity to provide a little background about myself. Although I am just a beginner in the refrigeration side of service, I have a little over three year experience servicing commercial restaurant equipment. I have had my universals for a little over two years now, bu have always passed refrigeration issues on to other companies. Alongside my current job, I am taking 20 hours a week in night classes to get my hvac/r degree. I will be done with these classes after this next spring semester. After I finish school I intend to look into getting different certifications.
So please, if I say something that does not make sense, or I am just totally on the wrong page on something feel free to correct me. Just try to as kind as possible..LOL!!
So far on my resume of refrigeration repairs I have:
1: repaired leak on true beer cooler and changed filter line drier
2: replaced low-temp control (timer initiate) and filter line driers on two different ice-o-matic ice machines. A 400 and a 500HA. Both machines sprung leaks in the control itself.
These repairs seemed to go pretty smooth and have not had anymore issues. They took longer than I would have liked, but I am still in the learning stages on this stuff, and try to take my time to hopefully prevent any mistakes I could make if I tried to rush them.
Now to the main reason for my post. My latest refrigeration issue is a TRUE TSSU-60-24. I was called out for a beer box and a prep table not cooling at the same location. Bad condensor motor on beer box, changed motor and issue was resolved.
The prep table on the other hand was a different story. All fans were working,compressor working, all par containers in top of box were in place, but I was only getting like 55 F across evaporator in box. Ambient temp was around 77 F. First thing I noticed was how dirty the condenser was. Thought this could be the issue so I cleaned it, but it did not help any. I was not getting heat to my condenser coils to be released. Compressor was extremely hot.
With my leak detector and bubbles I was able to locate a leak in the liquid line coming out of condenser. Added access ports, recovered charge, repaired leak, replaced COPPER SPUN filter drier, pulled vacuum (under 300 microns and held), then recharged. Did not fix problem. Through some advice I read on these forums I cut old filter open and found it to be gummed up with a black powder.
Next step cap tube!!!! All I can say is "you have to be kidding me." I will not even go through all the steps I did to change this thing. I put in a 032-cap and did away with copper spun filter. Did not fix my problem.
When removing old cap tube I noticed a black tar substance coming out of it when I heated it up, so I was pretty certain I found my problem.
I have a compressor on its way, as I am unable to build head pressure when covering condenser or stopping fan motor. My pressures with the correct charge are 8 on the lo side and 75 on the high. Only way to build head pressure is if I unhook high side hose and flash what's in my hoses on the low side, having the condenser fan stopped. Restart fan and I am right back to square one.
I am replacing compressor because that is what true and i believe is the problem. Anyone know of another things I can check. Any and all advice will be very helpful. It will be Wednesday of next week before I go back so please just let me know.
Thanks in advance