I handle Maintenance at a church. We have 14 5 ton carrier units. I called a tech out to service one of our new CKC060 condensers Day 1 he says that the compressor has tripped out on thermal overload and he would be back when it cools. Day 2 he tests the unit and and says the unit is equalizing so he removes the refrigerant then recharges by a digital scale. The factory charge is for 15 feet of lineset. Once the factory charge is in the pressure read 10 suction 165 head (I am Peaking over his shoulder trying to learn he doesnt mind I asked before hand) This is the part I dont understand. The tech seems to think that the valves are going bad. I'm no expert, but after reading here awhile, dont the pressures need to be more close in proximity to one another for the valves to be bad? I guess the unit could be undercharged but I watched the scale and it was on the money. The lineset is approx 50 feet, taking that into account I can see why the unit could be undercharged but the tech thinks that the pressures are way to low even for the extra length. The tech kept adding charge but the pressures would not go up at all. The suction line temp was at 76 deg the liquid line at 84 deg. Outdoor temp 92 deg. Now getting to the point is the tech right about the valves or is the unit undercharged. FYI the Condenser is 1 week old it was changed by another company who refuses to come and look at the unit.
Any help would be appreciated thanks