Supermarket Rack Refrigeration- How to Troubleshoot 99% of Refrigerated Cases Running Warm(15 Steps) скачать в хорошем качестве

Supermarket Rack Refrigeration- How to Troubleshoot 99% of Refrigerated Cases Running Warm(15 Steps)

15 Step Guide 1) Air flow Are the fans running Is the honeycomb plugged Is the coil Iced up 2) Temperature probe Verified temp probes in a cup of ice water (33 Degrees) 3) Is the controller calling for refrigeration? Did somebody put in a manual off or on. 4) Rack pressures Discharge Suction 5) Check Rack safetys Oil safetys High pressure 6) Check Condenser is it plugged Are the motors working How many are out 7) Receiver level Rule of thumb 20% summer Rule of thumb 80% winter 20% at 70 Degrees But above 0 is probably ok 8) Sight glass Is it flashing What is the load On the system. Hot day ? Cold day? 9) Rack filter dryer Take a pressure Differential. 5 psi rule of thumb. 10) Rack circuit Ball valves Are they open. 11) Liquid solenoid / suction solenoid / epr Check function 12) Pressure at the cases Does it match the case spec. Rule of thumb, evaporator coil 10 degrees under the required temperature. Is the liquid 100 PSI above the suction 13) Case hand valves 14) Case filter dryer Take a temperature differential 5 - 6 degrees rule of thumb. 15) Superheat Does it match the case spec. Is the case close to temp. Is the TXV screen clean. Test the TXV