Hey everyone, I have an issue and I was hoping to get a little insight on. Ill start with my condtion then my problem. Bear with me. I have two 12 1/2 ton 410A condensers, single piped into a 25 ton evaporator. All equipment is York (Johnson Controls). Each condenser has two 6 ton scrolls that are piped in tandem but can be staged if necessary.
I have roughly 160 ft of lineset. I ran 1 3/8" suction line and 7/8" per mfg specs. I have from the condenser going back to the evaporator in this order. 6' of horizontal pipe, 13' of vertical pipe up, 100' of horizontal pipe, 8' of vertical pipe up, 25' of horitzontal pipe, then 6' of vertical pipe down to evaporator. So essentially my evap sits about 15 above the condensers. I installed a liq line filter drier, solenoid valves, sight glasses, and txv sized for 12 1/2 ton (410a) near the evaporator.
I have verified that driers are installed correctly and that liq line solenoids are opening.
My problem is that I dumped enough refrigerant to get me close with my charge and I'm trying to start the condensers up and trim the charge out. What is happening, is that i will energize one condenser and the suction press will maintain about 120psi. The high side will start off at roughly 175psi then steadily climb up until it trips the hps. I then tried the other condenser, and the exact same thing happened.
After scratching my head for a minute, I just energized one compressor on one condenser, and presto the pressures stabilized. So after I watched it run for a while, I shut it down and tried to energize only one stage on the other condenser. Same problem. head pressure starts normal then within a minute, it climbs until the high press trips. I thought at first I had a restriction, but after seeing one compressor on one condenser run pretty steadily., I'm dumbfounded Now I'm completely off in left field. I am going to try York tech support tomorrow morning but it is like pulling teeth to get a hold of them. I was looking for a little insight from my fellow workers first. Sorry for lingering on but wanted to include as much as possible. Thanks for any help that you can offer.