Hi all! One of Our tech replaced the TXVs on a six ton freezer unit with dual EVAP two weeks ago. Instead of using the manufacture recommeded Sporland TXV. He decided to go with Danfoss stainless steel TCAE series. He also replace the oil, and restated the unit. The unit seems to be function normally, except it hardly goes close to Zero. He then tried to adjust the superheat to around 12-13 degree. Now, the unit hit zero temperature but it doesn't go any further (USDA regulation is -10 to -18). We decided to lets it operating at zero through the weekend, but a weird problem has happenned the next morning, the sentronic oil pressure has tripped sometime during the night. Reset the switch and it runs again with out any problems, but it will stop again the next day. We check The oil level and it is correct. Oil pressure is within spec. Sentronic control and sensor are brand new. Whatelse could it be? And why it only happen at night? We are stuck. Any helps will be appreciated.