E2 / Unloader Programming Help

[engineerdave]

I have a split temp Rack -28, +18, & +23. R507, Copeland compressors, evaporative condenser.

The -28 section Loads and Unloads in what seems a correct fashion. Rack back pressure stays within an acceptable margin of target at all times.

The +18 & +23 sides seem to have minds of their own. Example... Target pressure 56, actual pressure 72. Why then is my E2 calling for Unloader On?

I've reviewed the Staging set up for all three sections, they all appear to be set up in similar fashion. There's something REALLY simple here that I'm missing.....

[gatorfan9606]

I have a split temp Rack -28, +18, & +23. R507, Copeland compressors, evaporative condenser.

The -28 section Loads and Unloads in what seems a correct fashion. Rack back pressure stays within an acceptable margin of target at all times.

The +18 & +23 sides seem to have minds of their own. Example... Target pressure 56, actual pressure 72. Why then is my E2 calling for Unloader On?

I've reviewed the Staging set up for all three sections, they all appear to be set up in similar fashion. There's something REALLY simple here that I'm missing.....

what is your D.B? are you on standard or enhance suction? are your H.P settings the same for are the pumps ?i know E2 likes big numbers under H.P like the mbtu/h of each pump etc....(imo)

[thefreezerguy]

I have a split temp Rack -28, +18, & +23. R507, Copeland compressors, evaporative condenser.

The -28 section Loads and Unloads in what seems a correct fashion. Rack back pressure stays within an acceptable margin of target at all times.

The +18 & +23 sides seem to have minds of their own. Example... Target pressure 56, actual pressure 72. Why then is my E2 calling for Unloader On?

I've reviewed the Staging set up for all three sections, they all appear to be set up in similar fashion. There's something REALLY simple here that I'm missing.....

I was working with an RMCC last week with an unloader. Not sure if it is the same as the E2, but when it calls for unloader ON, it loads the compressor. Unloader OFF = unloaded.
Might want to check to insure the unloader isn't cycling opposite?

Good Luck

[gatorfan9606]

I was working with an RMCC last week with an unloader. Not sure if it is the same as the E2, but when it calls for unloader ON, it loads the compressor. Unloader OFF = unloaded.
Might want to check to insure the unloader isn't cycling opposite?

Good Luck

good point^ check the dipswitch

[engineerdave]

Will do fellas. Thanks