Air Conditioning Weather

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.

summer snow


It really almost looks like SNOW — doesn’t it?

summer snow 2


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.

dirty condenser


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!





About yorkcentraltechtalk

I have been in the HVAC industry most of my life. I worked 25 years for contractors on anything from residential to large commercial boilers and power burners. For the past 23+ years I had been employed by York International UPG Division ( a division of Johnson Controls) as a Technical support/Service Manager but I am now retired. One of my goals has always been to "educate" dealers and contractors. The reason for starting this blog was to share some knowledge, thoughts, ideas, etc with anyone who takes the time to read it. The contents of this blog are my own opinions, thoughts, experiences and should not be construed as those of Johnson Controls York UPG in any way. I hope you find this a help. I always welcome comments and suggestions for postings and will do my best to address any thoughts, questions, or topics you may want to hear about. Thanks for taking the time to read my postings! Mike Bishop
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6 Responses to Air Conditioning Weather

  1. Mr William R Crosby says:

    Thank you for writing it.

  2. Whit Perry says:

    Keep em coming…..

  3. GJL Refrigeration says:

    Is it OK to install fan cycling pressure switchs on the high side to cycle the two fans at 400 psig in and 300 psig out. To help keep my suction pressure up above freezing. The units are used on a mushroom farm and run all year. Model # of AC is ZF120COON2AAA5A roof tops

    • JCI/York makes a low ambient kit for that model unit. It is their part – MODEL 2LA04704632. It is a Hoffman control and it will control BOTH condenser fans to allow safe operation down to zero.

      • GJL Refrigeration says:

        I have several of these controls. They have dual sensor inputs, please text me a wiring diagram of this control, if you have one available I do not have one for this unit.
        Kindest Regards

      • You need to contact your local distributor for the unit wiring diagram. The 2LA kit should have come with install instructions and showing how to wire it in. If not, ask your distributor for that also.

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