so we have a call on a walk-in cooler that has a fan motor not working but it's more than that because the evaporative coil is completely iced up and so is this one right here this is newer equipment um i bet you any customers are leaving the doors open and the reason why i say that is when you come over here i just walked in they just opened this door is propped open like that walk-in freezer well that's probably gonna be iced up too all right so what we're gonna do is we're gonna go shut the condensing unit off um we obviously got to get to the bottom of that motor but then we got to figure out why it's iced up i doubt that the motor would cause both the coils to ice up like that but we'll see i bet you they're leaving doors open would be my thought but i'm going to turn off the condensing unit let just the fans run while i'm doing that and then get all my hoses and everything to get this thing fully defrosted all right my condensing it's right here not going to tell you much the sight glass is flashing but the coils are iced up so you can't trust what the sight glass says when you have iced up evaporator coils you have to defrost it first and then attack the problem after so kill that guy and then uh we'll figure out what's up condenser coil is not too bad this is the one uh yeah again i did this one back in april of NUMBER_TOKEN was the install on this equipment so all right i got this coil turned off we're gonna disassemble it we have two evaporator coils we have this one which is the primary and we have that one which is the secondary okay this one has the temperature controller and this one right here controls a solenoid valve in this coil and in that coil and then we have wiring running from this temperature controller over to that one that energizes the solenoid coil and turns the fans onto high speed and low speed these fans cycle on high and low depending on when it's calling for cooling uh it's an energy saving feature but it can also be problematic when it comes to defrosting because every time it goes into defaults it only runs them on low speed alright so i'm leaving that one running while we're working on this one it's a separate breaker that way that one can kind of air defrost while i'm defrosting this one with water you always want to judge the ice by the frost pattern okay um to me this looks like it's been defrosting but it hasn't been defrosting long enough because of a serious freeze up now um i have a feeling this has to do with the temperature controller which has the defrost built in and it's probably um not defrosting enough now that's not saying anything bad about the control because these things are never meant to be iced up this much this is caused by either it continually running and running and running and running or the evaporator being completely plugged up and dirty um i have a feeling again that they're leaving doors open which is a common problem here so we're going to get this defrost
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