noodle scratcher...randomly overcooling walk in cooler

[PharmaPhridge]

I would change your Anti Short Cycle to 5 minuets.

Cut in at 40 with a 5° differential

update - I chatted with Emerson and they said replace the controllers. not what i was expecting from the mfg. the support person suggested that it could be amp draw from the compressor and that the settings in the controller can affect the contacts ?!?!!?

ill try changing the antishort from 1 to 5.

any other theories and ways to find whats causing the random 60 minute overcool is so appreciated!

[VTP99]

The control is only wired to the solinoid correct ?

[pecmsg]

update - I chatted with Emerson and they said replace the controllers. not what i was expecting from the mfg. the support person suggested that it could be amp draw from the compressor and that the settings in the controller can affect the contacts ?!?!!?

ill try changing the antishort from 1 to 5.

any other theories and ways to find whats causing the random 60 minute overcool is so appreciated!

Tell the Support person hes full of $hit!

the controller closes the EEV or solenoid valve and the compressor pumps down.

[VTP99]

Unless he's got the controller wired to the contactor 😲

[PharmaPhridge]

i agree the support person was not helpful. the controllers are wired to the solenoids. the low pressure switches are wired to the contactors. (rem two independent units).

[TechmanTerry]

Doesn't the Keeprite evap MN# start w/ the letter K, like KLV ? Are the evaps facing/blowing into each other?

[PharmaPhridge]

good question..two keeprite units are installed in the ceiling and opposing each other about 12 ft apart. however they are never running at the same time and are completely independent of each other.

[PharmaPhridge]

thanks a million PECSMG! since i updated the antishort to 5 minutes no excursions! any thoughts on why this works beyond whats in the manual?

[Gary Warren Jr]

Short cycling keeping the compressor on I would think. PC you are the hero bro.

[Gary Warren Jr]

The default is 5 too start.

[Poodle Head Mikey]

Where exactly do the sensors "hang from" the evaporators?

Are the sensor probes always directly in the inlet air stream to the evaporators?

PHM
------

. . . the units are . . . each controlled by their own Emerson controller 16e09101. The sensor probes hang from the evaps.

Periodically, we are observing overcooling from a setpoint of 5C +/- 1C to about -6C. . . .

[PharmaPhridge]

They hang from the sides...

[Poodle Head Mikey]

Problem: System operates below setpoint at times.

Possibilities: Either the compressor refrigeration does not respond to the temperature controller contacts opening - or the temperature controller contacts do not open at the lower set point.

A way to determine which would be an independently powered latch-out-relay circuit across the temperature controller contacts with the NC relay contacts powering a light. If you see a too-cold spike in the temperature monitoring graph and the light is out - the contacts opened and the problem keeping the compressor operating to cool below set point is elsewhere.

Is this WIC inside a building or is it an exterior unit?

Can you correlate the too-cold-spike issue with the ambient and/or weather conditions in any pattern-establishing way?

[Gary Warren Jr]

Close enough to return. But I would have put a union in that drain for cleaning.