U.S. CitiesCity-Data Forum Index
Covid-19 Information Page
Go Back   City-Data Forum > General Forums > House
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
 
 
Old 01-11-2012, 03:36 AM
 
Location: Bay St Louis
1 posts, read 193,766 times
Reputation: 61

Advertisements

Quote:
Originally Posted by ByteRider View Post
A few facts for everyone here:

Compressors are the most expensive component in an A/c, but even still they are not that expensive. A 3-3 1/2 ton, 12 SEER compressor costs a repair person [who buys wholesale] about $350-$450 (typical 3 ton COPELAND compressor used by most AC units). You often replace the dryer on the unit too (the big round tube soldered in on the line), that's another $50-$80, and usually the thing that causes your compressor to go bad is the condensor fan is not cooling the unit properly... that's another $50 - $100.

The controller boards and caps usually aren't replaced during a compressor replacement, but the sales person will talk you into it. Don't do it until they can prove those components are bad.

I'm not an HVAC person but I have replaced my own compressor, fans, caps, etc. The compressor requires freon which means you'll be REQUIRED to get a qualified HVAC guy to cycle your lines (3 times) after the compressor is installed.

Installing a compressor yourself:

Buy the same brand compressor, makes life a lot easier with the wiring and copper tube connections.

Use MAP gas and 50% silver solder, do not use flux. The soldering technique is the same for copper water pipes, no different.

Total cost to replacement pump, fan, and drier: $723. Average cost of a quote I received: $1900. THe unit cost $2600 and is 7 years old. Stupid, huh? If you want a higher SEER A/c, simple... SEER is rated at the PUMP, not the coil.. so, install a better pump with a higher SEER! Ta-da...

Best tip anyone can give you when it comes to an A/c unit: Change your condensor fan every 5 years no matter what. They are cheap motors and take about 30 minute to install. You can also just take them apart and clean the insides... all of them are brushless, they tend to go bad because dust and grim get in them.. 4 screws hold it together, remove them, pull the spindle out, wipe it off, put a little grease on it, put back together... you're good for another 5 years. If you can pump gas in your car, you can replace the condenser motor AND replace the capacitors... they are, in reality, no brainers.
I have been in the industry for more than 15 years on the Gulf coast and i totally disagree. Not just anyone can replace a compressor. First how do you know it's the compressor? Second, what caused the failure? Was it a burnout? Why would I need to know if it was a burnout? What must I do if it was a burnout? Not to mention the possibility of electrocuting yourself. Next you use 15% silver solder not 50%. What are the dangers of soldering? What happens with oil residue in the refrigerant lines? What happens when flame is introduced to freon and freon residue in the lines? Ever heard of phosgene gas? What about the Oxygen Depletion Potential of freon? You know suffocating? What about how inhaling freon causes heart arrhythmia? Frost bite? What about refrigerant recovery and disposal? What about evacuating the system? A/C systems, are very susceptible to moisture and other non condensibles. Next freon. What type? How are you going to purchase replacement freon with no EPA certification? What about the life threatening dangers of freon? How much freon do you add? You just can't go by the factory charge on the nameplate. You have to take into account many factors and then calculate your super heat and subcooling in order to achieve a proper charge.
There are so many things to consider before trying to tackle something like this. If injury or death doesn't deter you, then the fact that you did it yourself will probably void any warranty that come with your $1000 compressor should. I can look up how to do an appendectomy online and get step by step instructions but I'm pretty sure most people would agree to just get someone who has been properly schooled and trained to do it. This is not like changing a fuse or the oil in your car. You could die or even possibly kill someone else many different ways if you don't know what you are doing and I would never recommend a compressor change out as a DIY project for a novice.
Rate this post positively Quick reply to this message

 
Old 01-13-2012, 11:05 AM
 
Location: Grosse Ile Michigan
28,921 posts, read 68,878,220 times
Reputation: 35323
For my dad it cost $35.

My brother bought it at an auction and we (my two brothers and I) installed it for free.
Rate this post positively Quick reply to this message
 
Old 02-06-2012, 05:38 PM
 
1 posts, read 193,653 times
Reputation: 43
how big of a compressor do i need to cool 1900 square feet
Rate this post positively Quick reply to this message
 
Old 02-07-2012, 11:10 AM
 
Location: Johns Creek, GA
14,617 posts, read 55,053,541 times
Reputation: 17698
Quote:
Originally Posted by archcolin View Post
how big of a compressor do i need to cool 1900 square feet

By yesterday's standards, a 2ton unit would probably be OK. By today's standards there no telling without a physical inspection of the home. Calculating a house for A/C requires a Manual-J worksheet.
There are a lot of factors that are used in the calculation- # of doors and windows. Type of construction. Wall construction and insulation. Insulation in attic; compass direction (solar gain), etc.
Then there's the Manual-D for the duct system. and finish all your calculations with a Manual-S.
Today, there is no reason to guesstimate. By doing a thorough calculation you will have a system that works at peak performance with minimal operating expense.
Rate this post positively Quick reply to this message
 
Old 02-07-2012, 10:46 PM
 
Location: Ontario, NY
3,070 posts, read 6,792,553 times
Reputation: 3330
Quote:
Originally Posted by ByteRider View Post
A The compressor requires freon which means you'll be REQUIRED to get a qualified HVAC guy to cycle your lines (3 times) after the compressor is installed.
Actually a license is only required if your system uses R22 freon, which of course most old systems do. If you have or are replacing with system with a R410-A refrigerant, no license is required. So long as your not touching a R22 system, your fine. If your replacing a R22 system with a R410-A system you need a licensed HVAC contractor to recover the R22 refrigerant from the old system before removing it.

Quote:
Originally Posted by ComfortZone1971 View Post
Not to mention the possibility of electrocuting yourself.
If you haven't mastered the mysteries of the circuit broker or equipment disconnect, you probably shouldn't be doing anything yourself.

Quote:
Originally Posted by ComfortZone1971 View Post
If injury or death doesn't deter you, then the fact that you did it yourself will probably void any warranty that come with your $1000 compressor should.
Pretty much anything you touch now a days voids the warranty. I wouldn't mass with the R22, but I wouldn't let a little thing like voiding the warranty stop me from working on it.

Last edited by TechGromit; 02-07-2012 at 11:01 PM..
Rate this post positively Quick reply to this message
 
Old 02-08-2012, 12:21 PM
 
Location: Johns Creek, GA
14,617 posts, read 55,053,541 times
Reputation: 17698
Quote:
Originally Posted by TechGromit View Post
If you have or are replacing with system with a R410-A refrigerant, no license is required.
WHAT?
I know the EPA would love to talk to you!
You are required to have an EPA Section 608 Type II or Universal certification license to handle R-410A but no license is legally necessary for purchase.
"to handle"- means working on systems that support R-410a refrigerant.
Rate this post positively Quick reply to this message
 
Old 02-08-2012, 09:23 PM
 
Location: Ontario, NY
3,070 posts, read 6,792,553 times
Reputation: 3330
Quote:
Originally Posted by K'ledgeBldr View Post
WHAT?
I know the EPA would love to talk to you!
You are required to have an EPA Section 608 Type II or Universal certification license to handle R-410A but no license is legally necessary for purchase.
"to handle"- means working on systems that support R-410a refrigerant.
I stand corrected, I assumed since no license is required to purchase it, no license is required to install it.
Rate this post positively Quick reply to this message
 
Old 06-18-2012, 10:51 PM
 
1 posts, read 189,796 times
Reputation: 23
I just replaced a five ton ac today. They customer did not want to replace the unit ...OK I am retired and was looking to make an extra dollar. The unit was out of freon and circuit breaker was tripped . One pound of brazing rod cost 125 dollars.. My mc tank needed a refill . that was 27 dollars. My trip to the job cost ten dollars in fuel. The unit holds ten pounds of freon. The cost of freon is 400 dollars for thirty pounds. The replacement compressor Scroll single phase was 840 dollars. The suction filter, liquid line drier , relay and dual cap cost another 125........I spent a day checking supply houses for parts....r22 replacements are not that well stocked any more..That was more gas wasted.... quotes are not given over the phone .All the supply houses had new hires I did not know them and they did not know me either. My certification was on file and that was the only reason they dealt with me...repairing the leak took all my skill . replacing the electric was not easy due to the age and rust on the connectors .I also was asked to look at another unit that needed a three phase disconnect box replaced . I HAD DOLLAR BILL SIGNS IN MY EYES WITH ALL THESE REPAIRS....I was lucky to collect for the material after showing receipts ....That is something I should not have done but i did not want to get stiffed ......I am lucky to still have my shirt on my back ......
Rate this post positively Quick reply to this message
 
Old 07-10-2012, 02:42 AM
 
1 posts, read 186,573 times
Reputation: 15
Angry DEaler not compling with warranty

I need to cool 1100 sq ft of space, up and down stairs, retired and hot!
Rate this post positively Quick reply to this message
 
Old 07-10-2012, 03:34 PM
 
342 posts, read 1,426,786 times
Reputation: 214
It would be good to know how or why it failed. Also think about replacing the entire condensing unit.
Rate this post positively Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


 
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:
Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > House

All times are GMT -6.

© 2005-2021, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Contact Us - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 - Top