I went out on a call today (ride-along) for a walk in cooler with a another tech at work. We were called there because the evap coil was icing over. I don't know a whole lot about the refrigeration side of this industry but I've have been around it in the past while working for a different company. The manufacturer is Russell and the walk in is a medium size 8'x24'. When we arrived, the digital temp display on the outside of the door was reading 37F. The evaporator was well on its way into becoming an ice cube. The control on the back of the evap/fan box was set to 20 F? PSI? I don't know, I didn't get a look. My past experience tells me its a pressure activated switch. The tech adjusted by temp.
I'm trying to determine how this unit actually defrosts. Does it use time off/on control, hot gas, or does it even have defrost? There were no heating element strips on this unit. Can someone chime in and tell me (specificity aside) why the evap is freezing over?
Couple of notes:
-Unit VERY recently installed
-Tech isn't a Reefer Guy
-Tech before us insulated the metering valve in an attempt to correct same issue.
THANKS!
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