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Posted by Joseph on July 15, 2007, 10:57 pm
> Hello all!
> I am a "field trained" technician who started as an apprentice and
> after being deployed for 5 years and out of the business, and becoming
> wounded rotating home am back in the service industry. I have been
> working on my own with the aid of my retention and a few books I
> bought,charging tables ect. but am wondering how to do what I used to
> know how to do but forgot after being out for so long. I remember that
> you can tell the current size of the unit (tonage wise) by looking at
> the model number. What exactly am I looking for in that number that
> tells me the units cooling tonage? I remember doing this all the time
> but like I said I've been out and disabled for five years and despite
> my ability to retain for some reason cannot remember this one?! I
> think it is important to know that I am an honest tech that does not
> sell people things they do not need.I dont condemn compressors to get
> the install, nor do I tell someone there leaking unit is from low
> charge when it was really from a dirty filter and coil...I clean the
> coil and change the filter...then if needed will charge the system. I
> see alot of this "fake diognosis" and it bothers me because it really
> creates a distrust of every HVAC tech out there.I also volunteer to
> help low income folks by charging systems replacing say a relay, or
> safety to restore their cooling at no charge, only donations in the
> way of bid/barter...I live in a warm place and without AC people
> really do suffer.
>
> On a side note, I have been doing pretty good with not one "call
> back", retained alot from five to six yrs ago, in fact in many ways Im
> better than I was when I worked for someone else, I offer prompt
> service, great prices, have my universal and license for refrig.
> products, have installed three splits but they were exact
> replacements. I want to know how to use the model number to obtain the
> tonage of cooling for an existing unit. Just so anyone who reads this,
> unlike many "techs" in my area I do purge the system with nitrogen I
> do use 3 psig while brazing, I do still use a sling psychrometer,sub
> cooling,superheat, ohms & watts law,ect in my daily service. Any
> resources regarding this question about the model # / tonage and ANY
> other training materials would be very welcomed so I can provide the
> best service possible.
> Many thanks....Ian
Thank You for your service and your sacrifice. Hope you're healing
well.
As far as the model #s and stats, they vary amongst the different
mfr's. As you know 12, 18, 24, 36, 42, 48, 60...etc frequently represent
tonnage of the equipment. The answer is however not that simple. Different
indoor and outdoor coils sizes will determine system capacities. If in need
to identify a unknown unit you can find the model number on the compressor.
This will tell you the design capacity of the compressor in btus i.e. 24,
34, 46...etc Experience and making good contacts with the mfg's and
distributors will be very helpful. Also a few of the guys here are great
sources of info for specific brands.
Joseph
p.s. Do not listen to the Stormin Moron as he is the worst hack around...
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