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I have a carrier Mod # 06dm337 for chilling water.....the lube oil pressuer drops off when I start up.....and low suction press....this is a medium temp unit....I think the L/O danfoss protection is working, because it shuts down the comp after a time delay.....I start with about 40 PSI oil press then goes to 0 with in 40 seconds......Why Why Please tell me if you have any ideas..I have cleaned the oil strainer,and cleaned the check valve,and checked the oil pump...seems to be OK what else.... Shawn Clementi

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  • smoore810 Mar 02, 2009

    I am useing R-22....I have checked the strainer,the check valve,the orifis,I took the oil pump off and checked the springs and keepers....put some oil in 1 side and then turned the impellar, seems to be I am going to make new gasget for oil pan ,reassemble and try again.....I will let you know what happens from that point.....thank you for taking the time to help......I also want to know if I can troubleshoot the L/O press protection Switch.....Danfoss bellows type.....

    Thanks again,


  • smoore810 Mar 02, 2009

    I am useing R-22....I have checked the strainer,the check valve,the orifis,I took the oil pump off and checked the springs and keepers....put some oil in 1 side and then turned the impellar, seems to be I am going to make new gasget for oil pan ,reassemble and try again.....I will let you know what happens from that point.....thank you for taking the time to help......I also want to know if I can troubleshoot the L/O press protection Switch.....Danfoss bellows type.....

    Thanks again,


  • smoore810 Mar 03, 2009

    Thank you very much.....that makes sence.....right now I just put the compressor back together and will add oil tomorrow.....and restart.....from there if I still have the same symtoms....I will check the TXV's.....thank you very much for the help with this process of elimination.....I will post the results when I find out difinativly what went wrong....

    Shawn Clementi



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Well I dont know what refrigerant your working wqith but I know the oil press sw's Ive dealt with open after a senmce of NO pressure Difference between Crank case and Oil pump Output pressure. You'll have to pump down the compressor and install an access tee for telling you what your oil pressure is and then subtract the suction pressure for true oil pressure. Usually the oil press sw is set at factory and is tween 7 and 20 psig. If it dosnt see this pressure a heater on the OP sw will energize and if the difference isnt senced withing the heater time limit it causes the points to open shutting off the compressor. If oil press is indeed low You could have bad oil, bad screen inlet to the pump or worn out pump or low oil. BEWARE LOW REFRIGERANT CAUSES OIL TO SETTLE OUT DURING A RUN CYCLE. So if you add some oil then Refrigerant Be ready to take the oil back out important to measure how much in so you dont take out too much. Low back pressure from anything from low charge to a TXV or other valve not feeding correctly. This pressure being low can allow oil to settle anywhere eccept tyhe crank case. The Refrigerant returning toi the compressor caries it back usually unless its piped in incorectly where the oil can trap OUT of the system and not be brought back. .

Posted on Mar 02, 2009

  • Farley Redfield
    Farley Redfield Mar 03, 2009

    You'll need to know what the cut out pressure is on your OP SW. And you'll need to know what the Suction and Oil Pump Pressure is. True Oil Press, is Oil pump Press - Crank case (or Back) Pressure.

    If your above this pressure the contacts in the OP should open and the Heater circuit de-energize on your OP SW. After you confirm you have Oil Pressure keep a close watch on oil level and refrigerant pressures. Im bettign your oil has setteled in your Evaproator (You did say it CHILLS WATER). IF this is all clear and it has ran like this in the past You mahave a leak, a bad TXV, or some other component Not allowing the refrigerant to flow 100% through the TXV or the evap thus trapping out the oil.

    PLEASE rate me accordingly ANd Thank you in advance.



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