i have a carrier 30gxn174 air-cooled chiller that is alarming on high discharge temperature(>210 degrees)for circuit "a" only. this machine has kicked my ass up and down and i need some advice before a carrier rep comes out to the jobsite and points at the problem and snickers "you big dummy"
checked the following----
1. motor cooling setpoint -- 190 degrees
2. motor cooling solenoid operation --working
3.replaced economizer float valve and weighed in proper charge of R-134A
4. verified no restriction in economizer bubbler tube
5. checked circuit liquid level-- running 1.8 when fully loaded.
6.checked liquid level sensor per carrier manual sensor-- checks o.k
7. pulled and cleaned liquid line strainer
8. verified discharge temp. sensor is accurate per carrier manual. -- sensor checks out normal.
9. verified condenser fans operation and rotation-- all working properly
10. verified compressor was not over amping -- amps normal
11. verified oil seperator heater was not energized 24/7
circuit "A" runs for around 20-30 minutes and discharge temp rises above 210 degrees. discharge superheat high(80)
but discharge pressure normal 130 psi no problems with circuit "B" at all