Learning HVAC
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Learning HVAC (by Smokowna [MD]) Jul 31, 2021 11:20 PM
       Learning HVAC (by Richard [MI]) Jul 31, 2021 11:44 PM
       Learning HVAC (by Robert J [CA]) Aug 1, 2021 12:56 AM
       Learning HVAC (by Robert J [CA]) Aug 1, 2021 12:56 AM
       Learning HVAC (by dino [CA]) Aug 1, 2021 1:24 AM
       Learning HVAC (by dave [CA]) Aug 1, 2021 12:41 PM
       Learning HVAC (by myob [GA]) Aug 1, 2021 12:53 PM
       Learning HVAC (by Smokowna [MD]) Aug 1, 2021 3:00 PM
       Learning HVAC (by Sisco [MO]) Aug 1, 2021 3:34 PM
       Learning HVAC (by hubba huibba [CA]) Aug 1, 2021 3:48 PM
       Learning HVAC (by Don [PA]) Aug 1, 2021 3:53 PM
       Learning HVAC (by gevans [SC]) Aug 1, 2021 9:14 PM
       Learning HVAC (by Jim [OH]) Aug 2, 2021 8:14 AM
       Learning HVAC (by myob [GA]) Aug 2, 2021 12:19 PM
       Learning HVAC (by myob [GA]) Aug 2, 2021 12:27 PM
       Learning HVAC (by John [LA]) Aug 2, 2021 8:07 PM
       Learning HVAC (by myob [GA]) Aug 2, 2021 9:59 PM

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Learning HVAC (by Smokowna [MD]) Posted on: Jul 31, 2021 11:20 PM
Message:

I've put down sewer line all the way out to the street. I've actually done a panel heavy up and had the wires replaced all the way to the pole. I even razed a house in a city.

All of these things and more without permits.

When there is a problem like a bad furnace, or water heater...I'll just swap them out.

(i.e. $300 circuit board or $900 Goodman furnace? I'll take Goodman).

But the air conditioning is my Achilles heal. I can't do the evacuation and charging.

What is your best guess. Would window units in bedrooms be more or less efficient than a central air system?

If central air is more efficient then I should learn the trade.

I would love to hear that window units in bedrooms only would be less than a whole house system. (Older homes...not great efficiency in the walls and windows).

Thanks all. --108.28.xx.xxx




Learning HVAC (by Richard [MI]) Posted on: Jul 31, 2021 11:44 PM
Message:

Don't do any at all. Let tenants buy their own window units. Have your handy worker install them so the tenants don't mess the house up. Maybe lower rent $10. Tenants can buy window units at hardware store of many places for about $100-$130, especially that summer is half over.

If you have larger homes with central air already installed, that's another thing but for those class C units that may be a little older, what I described above is the way I go. Those central units are too expensive. --24.180.xx.xx




Learning HVAC (by Robert J [CA]) Posted on: Aug 1, 2021 12:56 AM
Message:

Simple rule of thumb, lower units without a heat source such as the sun baking their units to death can easily have a few window/wall a/c units that will cool those zones down.

But an upstairs unit with a baking attic will transfer too much heat through the ceiling that you'll need a central a/c unit, UNLESS you have:

a) lots of attic insulation

b) an attic fan (solar are good)

In a 2200 square foot downstairs unit I put three window units in that apartment.

a) One in the dinning room that also blows air into the kitchen area and breakfast area.

b) One in the master bathroom, next to the door, that can blow air into that master bathroom and connecting master bedroom.

c) One in the second bedroom/office that can also blow air into the central hallway.

Have all three and that unit stays cool. At the cost of $1000 for all three.

Upstairs in the same size unit, I have an insulated attic with a large attic fan. I also have a large 4-1/2 ton central a/c roof mounted unit. Installed for $8,000 including ducting, gas for the new central heater.

The lower unit get cooler quicker, but after many hours the upstairs unit get the air more even in the apartment.

The downstairs pay much less for power, leaving only 1 on all night in the master bath/bedroom. The upstairs has their central system on 24 hours in the hot weather -- costing them too much for the power. --47.155.xx.xxx




Learning HVAC (by Robert J [CA]) Posted on: Aug 1, 2021 12:56 AM
Message:

Simple rule of thumb, lower units without a heat source such as the sun baking their units to death can easily have a few window/wall a/c units that will cool those zones down.

But an upstairs unit with a baking attic will transfer too much heat through the ceiling that you'll need a central a/c unit, UNLESS you have:

a) lots of attic insulation

b) an attic fan (solar are good)

In a 2200 square foot downstairs unit I put three window units in that apartment.

a) One in the dinning room that also blows air into the kitchen area and breakfast area.

b) One in the master bathroom, next to the door, that can blow air into that master bathroom and connecting master bedroom.

c) One in the second bedroom/office that can also blow air into the central hallway.

Have all three and that unit stays cool. At the cost of $1000 for all three.

Upstairs in the same size unit, I have an insulated attic with a large attic fan. I also have a large 4-1/2 ton central a/c roof mounted unit. Installed for $8,000 including ducting, gas for the new central heater.

The lower unit get cooler quicker, but after many hours the upstairs unit get the air more even in the apartment.

The downstairs pay much less for power, leaving only 1 on all night in the master bath/bedroom. The upstairs has their central system on 24 hours in the hot weather -- costing them too much for the power. --47.155.xx.xxx




Learning HVAC (by dino [CA]) Posted on: Aug 1, 2021 1:24 AM
Message:

Robert,

Is the attic fan a problem from the noise and if so how do you address the noise problem for tenants under the attic fan??

--76.171.xxx.xxx




Learning HVAC (by dave [CA]) Posted on: Aug 1, 2021 12:41 PM
Message:

TO DINO (CA)

attic or whole house fans must be properly mounted with rubber insulators / washers at mounting points to absorb motor vibration.

air flow path must be unobstructed

fan blades MUST BE PROPERLY ALIGNED AND BALANCED.

motor bearings must be good (not sloppy)

biggest problem is usually bad blades which will also trash a motor faster. --172.250.xx.xxx




Learning HVAC (by myob [GA]) Posted on: Aug 1, 2021 12:53 PM
Message:

Smokawana let me get you through your FEAR.

Here's the best way for a layman to evac a system.

I'm making an assumption you do your own install? using silver solder?

Evac is used to remove moisture from the system. What else removes water? iT'S running Freon through it. Freon boils the water away. So I connect tO The low side when I'm ready and open up the high side-- I let the Freon run through for 5 to 10 seconds and shut off the outflow. ALL moisture is gone. Leave the bottle connected-- now get your sniffer out and check your connections for leaks. If none! leave your bottle connected turn on the unit and do normal service. Folks I don't pay for electric bill for tenants-- do I care if it's not serviced "perfectly" --- NO I DON'T. These techs do the Texas 2 step running up your bill with all the fancy crapola. Why???? so they can run up your bill.

R-22 suction side runs about 65PSI with 75 degrees OUTSIDE. as temp outside goes up suction side needs to come up also -- so if its 85 out I like to read around 70 on the suction gage--OR THERE ABOUTS. when 90 I might read 73 or 74psi.

These guys sit for hours looking at charts and graphs and dew points-- REALLY are you getting what they're doing.

If I have systems that leak-- I schedule once or twice a year to top them off. So Smokowna stop being a chicken and just do it.

For those who don't like the floro carbons-- little fact: Mt. ST Helens when it erupted threw more CF's into the atmosphere then have ever even been produced here on earth. So spare us the your "hurting the atmosphere".

IT's control by the gov't-- goes hand in hand with the new lightbulbs. CONTROL (AND OF COURSE PROFIT) --99.103.xxx.xxx




Learning HVAC (by Smokowna [MD]) Posted on: Aug 1, 2021 3:00 PM
Message:

Thank you very much all. This is the last repair that I can't do on my own.

MYOB's instructions were easy to follow. Much simpler than some videos I've been watching. --108.28.xx.xxx




Learning HVAC (by Sisco [MO]) Posted on: Aug 1, 2021 3:34 PM
Message:

Smok, after 20 + years of paying invoices for HVAC repairs I had a realization that 90% + of the repairs are electrical component failures.

It sounds like you are able to troubleshoot electrical problems, the central airs capacitor, contacts, thermostat, relays, limits switch, and fan motors , and plain old dirt will be the issue, learn to diagnose these components and you will solve most of the problems.

Not that learning the repairs of coolant system isnít useful information, just not as frequently used.

--149.76.xxx.xxx




Learning HVAC (by hubba huibba [CA]) Posted on: Aug 1, 2021 3:48 PM
Message:

You still stuck on the light bulbs? --157.131.xxx.xx




Learning HVAC (by Don [PA]) Posted on: Aug 1, 2021 3:53 PM
Message:

Problem with window units is that bathrooms Don't get cooled. --73.194.xxx.xxx




Learning HVAC (by gevans [SC]) Posted on: Aug 1, 2021 9:14 PM
Message:

What Sisco said: 90 percent of HVAC problems are not related to refrigerant. They are electrical and dirt problems.

I learned HVAC 45 years ago...by volunteering as a free helper. It wasn't long until I got paid. Wasn't much longer until I could do jobs on my own. I'd be happy to have someone do the same with me right now! --69.80.xx.xxx




Learning HVAC (by Jim [OH]) Posted on: Aug 2, 2021 8:14 AM
Message:

MYOB gave you some very bad advice. I am not in love with government regulations but I am in touch with accepted practices. Intentional releases of refrigerants is not only unlawful but dangerous too.

Pay attention to what Gevans said about what Sisco said.

I have been in this trade for a long time and I strongly encourage you to resist the urge to start handling refrigerants. --184.57.xxx.xx




Learning HVAC (by myob [GA]) Posted on: Aug 2, 2021 12:19 PM
Message:

Jim has given really bad advise. We have used R22 for 50 or 60 yrs.

ALL OF A SUDDEN IT'S BAD BAD BAD.

When using ANY chemical or ANY process-- if you use a saw be careful -- termite treat same-- you have to use caution.

I got a big laugh at the UNLAWFUL part. SURE IT IS.... soo is speeding. What bull.

The dangerous--- I've haven't heard that one before.

FOLKS they sell refrigerant to service ac's on your car for gosh sakes. --99.103.xxx.xxx




Learning HVAC (by myob [GA]) Posted on: Aug 2, 2021 12:27 PM
Message:

Jim reread the post-- it was about Freon servicing. If your capable to service you surly can troubleshoot ac systems for bad parts. That's a given.

Everyone who does their own work has 35/5 or 40/5 or 7.7 mf. We all have relays so ants can build a NEW home or condenser motors or air handler motors or even circuit boards.

I'm not paying 200.00 to replace a 12.00 capacitor???? --99.103.xxx.xxx




Learning HVAC (by John [LA]) Posted on: Aug 2, 2021 8:07 PM
Message:

Bad advise from MYOB! The fine for release of Freon is $10,000. There is also reward for reporting this activity. --68.227.xxx.xx




Learning HVAC (by myob [GA]) Posted on: Aug 2, 2021 9:59 PM
Message:

I'm shaking!!!!!!! --99.103.xxx.xxx



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