Reading an Esterline Chart: How to test mechanical timers

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Using and understanding the Esterline chart. So here we have our Esterline chart also referred to as our timer sequencing chart. So in this video, what I'm going to do is explain to you how to read the chart, explain to you when you as a technician would actually use this chart, and also explain when you would be done testing. So to begin, let's start off with the left-hand side of our chart and that takes us to our timer position. And all this means is that these are the available cycles on this particular dryer. So our timer position can be set to auto regular, auto soft, cool down, end of cycle, timed, timed soft, and guard (guard will also be called wrinkle guard). At the top of the chart, we have our timer switches, and over to the left here we have T and X. T and X represent actual contacts on the back of the timer.
So where all of your wiring goes to the timer, if you were to take all of the wiring off, you would just be left with contacts. So for example, T right here would represent a contact and X would represent another contact, and those two contacts together would make a switch. Over to the right we have our legend, and this is simply telling you what position the switches are going to be in. So right here we have an open box. That means that's an open switch. Below it we have hash marks, meaning that it is closed. A solid box means that it does not matter. A little circle means that it's either but not both. And the plus mark means that it's closed intermittently. So let's come back over to our timer position right here. And the standard test for most dryers is going to be our timed dry right here or timed regular.
So we're going to take timed regular and we're going to come to a little box that we see here first. And here we have hash marks. So if we go all the way up, what this means is if I put a meter lead on contact T and one meter lead on contact S with this dryer set to the timed dry position, that switch T and X should be in the closed position. Next over we have an open box. So if we went to T and F with our meter leads, that switch should be open. Next, we have C and H, that switch should also be open. Next, we have hash marks again, indicating that C and B would be closed, hash marks again indicating that C and A would be closed and an open box indicating that T2 and W would be open. And lastly, we have T2 and S, which should be in the closed position.
Coming to our timer position, again, we're going to go down to the cool down and air cycle. Here we have the unique circle icon, which almost looks like an eyeball indicating that that switch is either but not both. And I'm going to explain what that means. So we'll start here on the first one and we see that it is going to be contact T and X. What this means is if contacts T and X are in the closed position, then contact T and F over to the right must be in the open position. If we were to come over to the second box again with our circle right here and we were to put our meter leads on T and F and T and F were in the closed position, that would mean that T and X must be in the open position. T and X and T and F will always be in the opposite position of one another.
And that's what either but not both means. Next, our third box here is a solid box, meaning that it does not matter. And in fact, if we were to put our contacts on C and H, it does not matter what position that switches in. It can be in the open position, it can be in a closed position, and that cycle will operate normally. One more time in our timer position here, and we're going to come down to our guard or our wrinkle guard. And here we have our little plus mark right here. What that means is that the switch will be opening and closing intermittently. How wrinkle guard works is that the dryer will turn itself off periodically and then periodically turn itself back on tumbling for just a few seconds and then stopping again, this prevents the clothes from sitting in the drum compacting on top of each other and causing wrinkles.
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