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Hi my name is Ryan Kliethermes and I am an Engineer at KE2 Therm Solutions.
One of the common questions we receive is what to do when you arrive at a jobsite and your walk-in Freezer’s evaporator coil is iced up.
With proper installation, the KE2 Evaporator Efficiency, and KE2 Adaptive Control will keep your coil free of ice, however, there are reasons icing does occur.

In this video, we’ll review some of the most common reasons ice builds on the evaporator coil:
The main reason we see ice build on an evaporator is improper coil sensor location.

Another reason for ice on a freezer coil is the defrost heaters are not operating properly.

And finally, the walk-in’s door is left open for a prolonged period, without a door switch.

Coil sensor location is one of the critical components of installing Adaptive Defrost controllers. It is essential the sensor be located where frost last disappears on the coil. If the coil sensor is too close to the heater source, the defrost cycle will terminate too soon, and the coil gradually builds ice. Refer to your installation instructions for the most common coil sensor locations or refer to our video on coil sensor location.
Next, you’ll need to check to make sure the defrost heaters are working properly. To do this, manually put the controller into defrost mode.
There are 2 steps to the defrost sequence on the KE2 Evap or KE2 Adaptive Control
When the controller begins to enter defrost, the fans will stay on to warm up the coil using only the surrounding air. This allows the controllers to utilize the energy stored in the coil before energizing the heaters. This cycle can last for up to six minutes, which we know can feel like an eternity, but be patient it is part of what makes the controller great.
Once the controller uses the energy stored in the coil, the defrost relay will be energized to turn on the defrost heaters. This is your opportunity to check the Amp draw of the heaters to make sure they match the amps listed on the nameplate.
If the heaters check out okay, then move on to the third possible cause of coil icing, the operating environment.
There is the possibility that the door is left open for a prolonged period. For applications with extended door openings, KE2 Therm recommends using a door switch.

When using a door switch, the system operates normally while the door is closed. Then, when the door is opened, the evaporator fans are turned off. This keeps the cold air in and prevents hot, humid air from being sucked back into the room, and freezing on the coil.

Additionally, the door switch triggers an alarm when space begins to warm and the door alarm delay is exceeded.

I hope this will help you when troubleshooting an iced evaporator coil, or perhaps preventing one altogether. And, keep in mind that in addition to door switches, we do have other accessories like a terminal board, wiring harness, and colored sensors, that make controller installation as easy as possible.

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