Why EPRs on a distributed system??

[jdwendling]

A store I service is having a remodel and installig an Edge Zero Zone distributed system for low temp. It has 2 suction groups -10 & -23. They are installing epr's with suction stops . The controller has temp sensors that also control the temp through the stop. Why not use a LLS, eliminate the epr and run at suction group setting?? I/C doors, W.I.F. Frozen Food doors.:confused: I thought the idea behind a distributed system was to use short piping runs and operate off of the suction setting. Comments?

[thermofridge]

Possibly to achieve longer compressor run time? The temp. control may be a backup control.

[Joe Harper]

The txv will close upon rise of the suction pressure. That will enable you to defrost the case and not pump the circuit down. If you put a lls in the system, you are going to continue to cool the case while you are trying to defrost the coil.

Also using a epr/suction stop will allow the load to be distributed to where it is needed, making the system more efficent.