This was a service call on a walk in cooler that was iced up. I de-iced the coil and couldn’t find anything wrong but I had a few ideas as to what could have caused it.
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22 thoughts on “Walk in Cooler Iced up

  1. Jeff AlwaysDry says:

    I have a walk in cooler which iced up only on 1/3 of evaporator close to TXV side (left side). The ice starts a couple of inches after TXV. Any ideas about the problem? Thank you

  2. Joe Young says:

    That's one of the dumbest things I have seen doing hvac/r work. Slowing the fans down like that. I don't think that will save them very much by doing that. Design flaw for sure!

  3. Edward Gaddis says:

    Dude I hate ecm motors. If your trying to micromanage a function that should run at more of a macro function (full speed all the time) WIC a productive air defrost is imperative. All the trouble to save a few knickles or to feel warm and fuzzy over the environment.

  4. MTLTV1765 says:

    I have also heard of walk in systems (especially in freezers) where when the system goes into defrost mode, the fans go off completely and a heating element comes on to melt the ice on the coils. I have observed that very frequently, the fans on some of the evaporator units in the grocery freezers at Sams Club are off. After doing research, I believe that those evaporators have a controller which switches the fans off and switches on a heating element to defrost the evaporator. Once the evaporator is defrosted, and it cools to below a certain temperature, the fans come back on.

  5. 서라벌의별 says:

    a few reason why evaporator coil got iced up. mostly low on Freon.
    or coil is dirty. fan moter did not work. TXV open too little. low pressure setting too low. thermostat fail to stop.ETC
    when you have coil freeze up problem with enough freon.
    adjust low pressure setting for cut out at ET 23F-25F cut in at ET 35F-40F.(ET is evaporating temperature) If you click my ID name you will see more inform..

  6. zc world says:

    we got a system like that at work

    but we dont slow down the fan , when the room hits the target temp

    all but one fan turns off ,

    its just helps to move air around the room and helps to keep the room temp a bit more stable

    the rooms we got at like 500 metric tonne rooms at -20c

  7. leo mestta says:


  8. George Robles says:

    I would guess the defrost isn't on long enough. Only bottom defrosts and with those fans going, they probably are keeping the top half cool enough not to melt the ice.
    That's assuming the ice was on top half of coil cause not sure if you mentioned where the ice came from, just that was half.
    That's also assuming those ecm fan motors stay on during the defrost cycle.

  9. Joshua C. says:

    I've always wondered why these "energy efficiency" things always target the fans in HVAC equipment.
    It seems silly to focus on the fans, when the fans are such a relatively low draw as compared to the entire unit/compressor.

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