Since this is the 200th post to my blog (yes I am bragging), I figured the subject of maintenance would be a very good subject. So what has that got to do with the title of this post?
It is that time of year that we see our ‘summer snow storms’ occurring. What am I talking about?
You probably guessed — yep — it’s cotton wood season here in the Midwest.
It really almost looks like SNOW — doesn’t it?
Of course SNOW is the last thing we want after this winter.
Anyway, these pictures were set to me from St. Louis and, coupled with the hot weather they have had, started to make units trip high pressure switches. Now, here in Chicago, the cotton wood has been in bloom but we have not had the hot weather YET to cause this problem (one of these days it has to get hot). But I am drifting and need to get back to my point.
Seeing the cotton wood pile up on the condenser coil is pretty easy to spot and getting the surface clean is pretty easy.
Where a lot of contractors goof up is they don’t realize that some coils are 2-row or split coils. They clean the outside coil but not the inner coil. Now they still have high pressure problems. Of course, the next step is to remove some refrigerant — NO! Of course if they do this, now they really have a problem.
As I have said so many times, the LAST thing you ever want to do is adjust the charge in a unit. Most “pressure problems” are caused by something EXTERIOR to the refrigerant side of the system.
So, keep this in mind and make sure you do complete maintenance on any system you work on. (And THANK YOU for reading my ramblings for the last 3+ years and all 200 posts — it is appreciated).
PS: Pictures compliments of the York Service Manager in St Louis UPG office! — Thanks!