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found out that I had a faulty EXV. it had me fooled for awhile because valve would work fine until it went to an almost closed step position and then hang up. circuit 2 had same problem. 2 bad exv's...

I switched drivers and it didn't change anything... I then used manual control in run mode and the valve would move wherever I wanted...I don't understand what is keeping the valve from moving to X...

Ok I will switch the drivers and see what happens. I wonder why it always moves in test mode? Sounds like you work on a lot of mcquay chillers freonrick

LIQUID 160.8 PSIG SUCTION TEMP 57.7 DISCHARGE TEMP 178.3 LIQUID TEMP 84.9 DISCHARGE SH 65.7 LL SC 30.9 EXV 3384 EXV STATE PRESSURE, SLIDE 23.4 SLIDE TARGET 32.0

I have checked the exv in the test mode and it is easy to see it move. When running, circuit controler says exv was at 3384 but in the sight glass it still looked like it was closed. I ran exv to...

I couldnt see exv move when it was running. I think it said 3000 steps and 0 slide with high subcooling.(I will log all of this down monday) I couldnt read much pressure drop at the driers but...

Steveoo I think you ment to post in this thread friendYes there is a oil dp.check oil return line,strainer pressure drop .Some time if discharge s/h is to low it will cause foaming in oil and optic...

Low evap refrigetant pressure...(I was just told that something like 28 or so tubes are pluged instead of 5) I believe there is adequate water flow tho, I got the exv to open and close in test mode....

If the old drier is factory installed it is going to be on the liquid line on the wrong side of the service valve if you were just going to pump the system down...your best bet is to take an empty...

I have a ags300b27-er10 that I am cutting my teeth on right now so I can't tell you a whole lot about it. try to look up the om agsbb4 and imm ags-1 manuals. I just looked in my operation manual om...

circuit 2 is locking out on the same thing and that made me want to check the water flow. ckts have seperate circuit controllers so I am going to start with ckt 1 first. I have never seen the exv...

both ckts are low evap ref pressure. After I determined flow today I started checking ckt one. From what I read in the operation manual upon start up h exv performs a pre-open function and opens to...

ok. I checked the pressure at the two drain fittings with the same gauge and found 8 PSI drop (water temp is 75 deg F). I just used 8 psi X 2.31 to convert to ft of water 18.48. There is a presure...

that will help if I can put a gauge on the drains just to check for now. I do have the IOM with flow chart. I THINK this machine controls in subcool mode at start up and as soon as it starts to load...

it is air cooled but it has a flooded evap (water in tubes). mcquay int. plugged them because of glycol leaking into refrigerant system

I did find a plug in the leaving chilled water piping but everything else is insulated. I saw on paper that they checked the flow and pressure drop at startup which was 7 years ago but I dont know...

both circuits tripping on low evaporator refrigerant pressure and I have been told that 5 tubes have been plugged, checked glycol concentration and it is 38% propolyne. going back tom. to start...

seems like every year the most busy week is the 4th of July for me 100 DEGREES IN CHARLESTON WV this weekend!

Wow, right there it is on page 8. Still not for the faint at heart. I would be sweating if brazing on a charged line.

Great way to save some dough and keep the co2 down in a crowded building. But have mercy on those filters!

hey, new member here.. first fourm I have ever joined actually, just trying to play by all the rules. Went to vocational trade school hvac and sheet metal.. got my first job out of high school at a...

I agree, I started out on the install side of things and it helps you to understand how everything goes together. I have seen a lot of problems from equipment o the service side that was not...