And SH doesn't really mean much at that kind of temp in the box you need to check it when your closer to opperating temps... I know you can't there but try taking that jumper off the klixon and see what happens at least your compressor will be alot cooler.
an 8 oz charge leaves no room for error
there is a little bit of rocket science involved in propely getting an 8 oz charge in a closed system
i sent you a PM
A hot pull down with a cap tube will look like an undercharged system as far as superheat goes. You will only be able to get a true assesment of charge when the unit pulls down to temp. I agree that the head pressure looks low for that ambient temperature espcially with that much load on the evaporator. I have a feeling that you either have a faulty overload, or a compressor that has some fatal mechanical damage.
A few questions I have. Don't have much experience with cap tubes. Would the suction be that low with such a high load on the evap? I'm thinking that that it could be because the cap tube is just a pressure drop. But on the other hand you would thing that the suction temp would drop pretty quick, with no product in the box. Btw......I did run it for 45 minutes with the coil stat hooked up, keeping the evap fan off. Before I jumped it out.
Also the compressor is definitely overheating. (I should have taken the shell and discharge temp....but it was hot as hell) Why wouldn't it with a 73 degree return?
I also threw 2 bags off ice in there, to try to get the temp down to see what would happen. But it didn't drop the temp much......maybe 5 degrees or so.
The way I evacuated and charge was.......I pulled a 200 micron vacuum through my gauges (didn't take long with such a small system). Both lines I had ball valves at the ports. I then hooked my tank up and bleed liquid up to the ball valves. I zeroed my scale that reads oz to the hundredth. I charged 8.13oz of 404a. I did add another 3.12 oz of 404a later to see what would happen.
ascj A question I have is how are you going to fix a cap tube system that is a freezer and with the same components be a cooler?
IMO if it is for a friend you should have them pick what they want the most and go from there other wise it will run piss poor no matter what you do to it :.02:
I read Ice's link
That M# must be a Freezer only ;)
low suction pressure and high superheat really sounds like a restriction huh. i always try to order oem capillary tubes. i honestly would rather work on a walk in box any day rather than a reach in cooler or freezer. theres nothin worse than changing out a cap tube and still haveing an issue.
I would agree with it being restricted. I use a IR gun to measure the temperature of the coils in the condenser, if the top coil is warm but the rest are cool and maybe even the last will be nearly ambient then you have a restriction.
could be the filter, could be the cap tube.
I have been seeing alot of cap tube systems and heard about adding supco s8 additive oil to system and it will help unclogg cap tube. My question is how do you add the oil to the system.
I dont know if supco will clean clogged caps , it may make it worse because it loosens debris wherever its found.
Its basically kerosene
Your best bet is to replace drier , and cut out 5 inches of cap tube because thats usually where they clog
Cut drier open to see what the problem was..... Wax build up , or drier self destructed internally
If it was wax , then you need to keep cond coil clean because its getting too hot