Here is what I would do :
Start the system with gauge set installed and tepm reading devices in place .
Let the system run for 15 minutes NO load . Personally , I would run all the tests with no heat load of any kind to start with .
After the system has run for 15 minutes then take the following readings and report back :
high side reading
low side reading
voltage at your power source (the wall outlet)
Take temperatures at the following areas :
1) Ambient air temperature in the room you are in . Try and duplicate the worst temps( hottest room will ever get) the unit will ever see . This will help when adjusting the charge , if in fact it needs adjusting .
2) condenser out put line
3) compressor shell
4 ) suction line . On a rotary compressor this would be about 2" above the accumulator . On a recip compressor I'm not sure . Just measure it at the end of the suction line closest to the compressor.
5) In coming condenser air temperature. I do this with a digital meat thermometer . Just stick it in front of the condenser .
All the above testing is why I can't tell you what to do with the super heat . We just don't know any info . There are many causes of super heat and sub cooling issues . I'm not going to go into them until we get your results . You are also stretching my knowledge base here quite a bit . I have one unit under my belt and a SWEET piece of work under way right now.
Once we get the no heat load charge under control we can start all over except this time you can do it under load . The charge adjustment at this point will be most likely minimal.
REMEMBER : always let the system balance from a cold start before taking any readings for 15 minutes . Any adding of or reduction of refrigerant will need to be be done VERY slowly . I mean real SLOW. You don't want to flood the compressor .
A couple bits of advice :
1) Take some pics (detailed ) of the unit .
2) We need detailed specs of the unit not just compressor model . What is the metering device ? What is the make of the condenser . What are you using for fans ? What type of refrigerant is in the system
3) Get some refrigeration tools !
4) Get a pressure temp chart for your refrigerant .
Lastly ..... Running the unit on the high end of the superheat will give you the best cooling
Yes , Drew is a .... well , GENIUS and very adept at this art . He has been a trooper for me and has the patience of a Saint . Many folks on this forum share that knowledge as well (not me , mind you) and will be more than willing to help !!
EDIT : You posted while I was typing ..... sorry !!!
-FlockoEdited by flocko - 7/11/11 at 3:35pm