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Old 04-09-2009, 09:32 PM   #16
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Replacing 47 year old AC unit


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Originally Posted by johnnyboy View Post
I don't care what your """overhead""" is, I don't want to pay for your fancy decal'd new pickups and for some guy to harass me at home depot to get a new furnace. especially now that times are so tough.

What do you do.
So we know what to get cheaper.
Cause we don't want to pay for your house.

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Old 04-09-2009, 10:39 PM   #17
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Replacing 47 year old AC unit


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$4800 what a scam, for a weekends worth of work and $1000 in equipment. well you know home depot pockets half and subs the rest out.

My dad does HVAC for a living and I wish I would have learned more about, I've done dozens of installs but never got involved in sizing.

what's your sqft?
I would suggest you watch who you insult with words like SCAM.

Most of the "Free answers" from this site are given by pros in the business for a long time and know a whole lot more then you.

Since we don't get paid to give free advice you slight of our industry is even more blatant.

So clam up with the insults.


Oh, and why ask the guys square footage? You gonna do a free Manual J load calc for him?
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Last edited by hvaclover; 04-09-2009 at 10:41 PM.
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Old 04-10-2009, 06:56 AM   #18
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Replacing 47 year old AC unit


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Originally Posted by johnnyboy View Post
$4800 what a scam, for a weekends worth of work and $1000 in equipment. well you know home depot pockets half and subs the rest out.

My dad does HVAC for a living and I wish I would have learned more about, I've done dozens of installs but never got involved in sizing.

what's your sqft?
johnny boy
I have an empty warehouse, I do not know what size equipment cable-data-guy needs, however I will give you 1K for every complete system you have to fill my warehouse. You got to be kidding.
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Old 04-10-2009, 02:53 PM   #19
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Replacing 47 year old AC unit


I've been looking at a bunch of threads and links through this site.

What I've learned so far is that I need to do a system sizing calc for heating and coling before jumping in and buying a system from my cousin.

I guess I forgot to mention my house is 2400 sq ft. In summer humidity is almost zero.

Once I size the system and get it here I'll need to do these steps if only need new AC.

1. Pull out the old R22.
2. Pull out the old system. It's in the attic and will come down the ladder.
3. Make sure I plug all the lines good to keep air/moisture out.
4. Put the new system in place. Push it up the ladder
5. I need to build a new pad for my outside unit.
6. I need to put in a disconnect box at the outside unit.
7. Hook up the wiring.
8. Attach all the lines soldering the joints.
9. Put in a receiver/drier in liquid line to evap.
10. Get a transition box built for furnace to coil. My furnace manual says it must be 18" long.
11. Will need a new plenum box built and attach ducts to it.
12. Pull a vacuum on the system. Leave it overnight to see if it holds.
13. Recharge with R22.
14. Fire it up and see if it works.

What am I missing?

While I have the plenum removed should I have the ducts all cleaned out?
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Old 04-10-2009, 03:32 PM   #20
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Replacing 47 year old AC unit


What size breaker/ wire will the new unit require ??. I test with nitrogen & pull system down to within 200 microns. I also purge with small amount of nitrogen while soldering

Last edited by kenmac; 04-10-2009 at 03:36 PM.
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Old 04-10-2009, 04:55 PM   #21
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Replacing 47 year old AC unit


Good question. I'm not sure. I was expeing to use the existing wire and use the same size breaker as in the main panel. It's on a dedicated circuit.

Would the manual with the new unit give that info?
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Old 04-10-2009, 05:07 PM   #22
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Replacing 47 year old AC unit


Breaker /size wire will depend on amps..
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Old 04-10-2009, 05:32 PM   #23
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Replacing 47 year old AC unit


So when I get the new unit the amps will be on the data plate.
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Old 04-10-2009, 05:48 PM   #24
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Replacing 47 year old AC unit


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So when I get the new unit the amps will be on the data plate.
make sure you get straight amps
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Old 04-10-2009, 05:53 PM   #25
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Replacing 47 year old AC unit


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make sure you get straight amps

Sure don't want to use the crooked ones

Last edited by kenmac; 04-10-2009 at 05:59 PM.
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Old 04-10-2009, 06:01 PM   #26
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Replacing 47 year old AC unit


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Sure don't want to use the crooked ones
No...if they aren't straight they might blow fuses


sorry...I couldn't resist .
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Old 04-10-2009, 07:59 PM   #27
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Replacing 47 year old AC unit


Never heard of straight amps. What's that?
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Old 04-10-2009, 08:14 PM   #28
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Replacing 47 year old AC unit


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Originally Posted by hvaclover View Post
No...if they aren't straight they might blow fuses


sorry...I couldn't resist .
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Old 04-10-2009, 08:18 PM   #29
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Replacing 47 year old AC unit


ah, I thought it might be but had to ask.
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Old 04-10-2009, 08:46 PM   #30
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Replacing 47 year old AC unit


Quote:
Originally Posted by hvaclover View Post
No...if they aren't straight they might blow fuses


sorry...I couldn't resist .


We are in a new century.. I thought everyone used breakers.. Talk about fuses,,,, you are telling your age

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