This one seems to be a mystery.
I am requesting your support with an issue with our walk-in cooler that uses two Keeprite 423ME-S2B evaporator units mounted on the ceiling.
the units are ceiling mounted on opposite sides of a 15x15 box and are completely independant of each other. they 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. the overcooling lasts for about 60 minutes and down 10C from the previous Tmax.
The issue is happening regardless of which both keeprite unit is on and has been happening since 2018. these are the recent cases:
Date Time from Tmax to min (minutes) Delta from Tmax to excursion min (celcius)
25-Nov 70 -10.72
27-Nov 65 -10.75
05-Dec 60 -10.51
17-Feb 60 -9.53
23-Feb 65 -13.02
what would cause such random drops in temp? the temp drop and the time of the overcooling seems too similar to be a coincidence.
some theories have been:
the controller (but would both be malfunctioning?)
The contactors(again would both be broken)
could a setting in the Emerson be keeping the system running?
I am requesting your support with an issue with our walk-in cooler that uses two Keeprite 423ME-S2B evaporator units mounted on the ceiling.
the units are ceiling mounted on opposite sides of a 15x15 box and are completely independant of each other. they 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. the overcooling lasts for about 60 minutes and down 10C from the previous Tmax.
The issue is happening regardless of which both keeprite unit is on and has been happening since 2018. these are the recent cases:
Date Time from Tmax to min (minutes) Delta from Tmax to excursion min (celcius)
25-Nov 70 -10.72
27-Nov 65 -10.75
05-Dec 60 -10.51
17-Feb 60 -9.53
23-Feb 65 -13.02
what would cause such random drops in temp? the temp drop and the time of the overcooling seems too similar to be a coincidence.
some theories have been:
the controller (but would both be malfunctioning?)
The contactors(again would both be broken)
could a setting in the Emerson be keeping the system running?
source https://hvac-talk.com/vbb/threads/2237456-noodle-scratcher-randomly-overcooling-walk-in-cooler?goto=newpost
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