Trane Model RTAA1004XM01A3D0BG
Chilled Water Flow (Ent Wtr Temp) lock out fault
This is the issue I'm having today with the 100 Ton unit at my automotive factory. I have checked my manual and it explains that the entering evaporator water temp drops below the exiting water temp. Simple enough. I can clearly see it do so within 30 seconds of starting circuit 2. The exit temp barely fluctuates and the entrance temp starts dropping fairly fast after the compressor starts.
I don't appear to have a flow issue, all of the pumps are fine, flow switch is working, and most importantly I can lockout circuit 2 and run circuit one and all is well.
There is one water temp sensor at the entrance and one at the exit to the evaporator, so I am ruling out a sensor issue because both compressors use the same sensors for temps.
I let circuit one run and cool all of the water down so the equipment could run in the facility. After the water was cooled to it's set point, I started circuit 2 alone and it acted exactly the same, faulting within seconds.
I have ran the EXV service test and everything seems to react the same between the 2 circuits. (The test only involves listening for clicks and timing the pauses between them as the machine cycles them closed and open).
I can't help but think there is an issue with the EXV or something restricting refrigerant flow.
Anybody have any advice to help me out?