Supermarket Rack Refrigeration- How to Troubleshoot 99% of Refrigerated Cases Running Warm(15 Steps)
Автор: Gendron HVAC-R
Загружено: 2022-10-14
Просмотров: 26563
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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
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