Hi folks, installed a new TXV on a 5 ton Luxaire system, 2008 model, R410a. Using a fieldpiece 480 digital manifold.
Hi pressure 340, low side, 125. Outside air was 55F. Inside air 67F. I went to lunch had my helper stay on the job, close the king valves and blow the line set and evap charge so I could change out the TXV when I got back. Change it out, vacuumed down to 700 microns, opened king valves, loaded in charge by weight, around 10 lbs, (long line set), 2 story house. I keep getting -12 sub cool and - 34 supercool on my gauges! I bump refrigerant into it and subcool jumps up to good numbers then goes back to negative numbers. I am thinking my helper dumped a lot more charge out of the condenser without closing the valves correctly and he’s not being honest and its starving for refrigerant, but DANG, I HAVE THOSE PRESSURES that seem to be good! PLEASE, ANYBODY HELP FOR ADVICE, At this point I’m willing to give my phone number for help.
Hi pressure 340, low side, 125. Outside air was 55F. Inside air 67F. I went to lunch had my helper stay on the job, close the king valves and blow the line set and evap charge so I could change out the TXV when I got back. Change it out, vacuumed down to 700 microns, opened king valves, loaded in charge by weight, around 10 lbs, (long line set), 2 story house. I keep getting -12 sub cool and - 34 supercool on my gauges! I bump refrigerant into it and subcool jumps up to good numbers then goes back to negative numbers. I am thinking my helper dumped a lot more charge out of the condenser without closing the valves correctly and he’s not being honest and its starving for refrigerant, but DANG, I HAVE THOSE PRESSURES that seem to be good! PLEASE, ANYBODY HELP FOR ADVICE, At this point I’m willing to give my phone number for help.
source https://hvac-talk.com/vbb/threads/2227558-Negative-superheat-negative-sub-cool-PLEASE-help-going-crazy!?goto=newpost
No comments:
Post a Comment