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Re: HVAC Service Contracts & Annual Service

Posted: Sat Sep 19, 2020 6:34 pm
by htdrag11
I've been a home owner for about 40 years and never knew anything about HVAC until the virus. Since you opened up the furnace, might want to consider adding a UV light.
So I bought a Honeywell UV light with an air sensor and had that installed (under 20 minutes) with a round drill bit to cut 2 holes (about 2" for the lamp and 1" for the sensor) at the bottom of the furnace. Lamp sits on top of the air pushing toward the house, to kill of germs.
Some people also add another UV light ($180 without sensor) in the evaporator coil area (A-coil, due to the shape - I've been reading) to reduce condensation/mold build up. The Honeywell UV light was like under $100 before the pandemic but now it's $280.
Bottom line, my allergies is better this year.
As aside, my AC unit got cleaned inside out and also the HVAC guy fixed the leak on the coil first, prior adding Freon. Think I finally find the right person after all these years.
GL

Re: HVAC Service Contracts & Annual Service

Posted: Sat Sep 26, 2020 8:28 am
by Chuck107
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Re: HVAC Service Contracts & Annual Service

Posted: Sat Sep 26, 2020 8:50 am
by tibbitts
Chuck107 wrote: Sat Sep 26, 2020 8:28 am
tibbitts wrote: Sat Sep 19, 2020 5:12 pm
Chuck107 wrote: Sat Sep 19, 2020 4:20 pm
tibbitts wrote: Sat Sep 19, 2020 2:20 pm
Chuck107 wrote: Sat Sep 19, 2020 12:59 pm

With the proper multimeter it's easy, must take care to turn off all power to the unit and properly short the contacts on the capacitor.
It's not "easy", because of how difficult it is to find a good-quality capacitor discharge tool. Seriously, it's as if the instructions for checking refrigerant charge said "first, build your own manifold gauge set." Who wants to solder resistors or use little clips to hold them to a wire? I just want to attach a tool that evaluates the capacitor and displays when it's been properly and gently drained. And doesn't get 0.2 stars on Amazon. Okay 4 starts but then have a bunch of reviews claiming they don't work.
You use the same meter to discharge if you like.
I have three meters at my house now with various resistance ranges blown out. I guess I need a meter that will know its objective in life in to drain the capacitor as rapidly as possible while still being safe. Remember the audience here is those of us who aren't professionals. It's sort of like the posts saying how easy and safe to replace your own brakes: it's easy and safe when done correctly.
I knew this method existed, however I never used it so I just looked it up to refresh my memory and perhaps to use it in the future.
No need for a meter to test uf , just a clamp amp meter and voltage meter. And a calculator.
This test is done while the unit is "running".
No need to remove and drain the capacitor.

"let’s say you read a start winding amperage of 4.4 x 2,652 = 11,668.8 divided by a measured voltage of 335 V = 34.83 μF.
If the run capacitor was rated at 35 μF, this would be within range."
from article linked below.


https://www.achrnews.com/articles/13516 ... is-running
Thanks for that link; I had not thought of that method. I wasn't aware most hvac techs do any capacitor testing during normal preventive maintenance.

Re: HVAC Service Contracts & Annual Service

Posted: Sat Sep 26, 2020 8:55 am
by Chuck107
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Re: HVAC Service Contracts & Annual Service

Posted: Sat Sep 26, 2020 9:07 am
by tibbitts
Chuck107 wrote: Sat Sep 26, 2020 8:55 am Your welcome, over the years (27ish) I have had about 8 different Heatpump techs, check my systems I have stood there and watched each and every time, not one had ever even touched the capacitor let alone pulled out a calculator.
That is disappointing considering that realistically the capacitor is an item that is highly likely to fail. Maybe they are relying on the physical appearance to give a clue as to overheating. In any case I think that's one reason many people hesitate to purchase preventive maintenance: not much may actually be checked.

Re: HVAC Service Contracts & Annual Service

Posted: Sat Sep 26, 2020 9:31 am
by Chuck107
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Re: HVAC Service Contracts & Annual Service

Posted: Sat Sep 26, 2020 11:38 am
by Chuck107
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