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Old 01-18-2016, 07:37 PM   #1
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Repaired Armstrong myself, so I have to brag!



A split had developed in the 3/8" compressor suction line, so I cut out that piece of pipe and sweated in a couple elbows with appropriate connectors. While I had it all apart, I oiled both the fan motor bearings and replaced the capacitor.

Managed to get it vacuumed and charged, and now it's making 20 degrees split across the evaporator!

In looking at this unit, it's worth keeping. These are good sturdy old units with real metal and without all the whiz-bang control boards that only die anyway.

Woo-hoo!!

And I promise the jug of R-22 off Craigslist and the used vacuum pump together didn't cost as much as an RV tech would have wanted to fix it.
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Old 01-18-2016, 08:08 PM   #2
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Brag away! As someone who completely lacks those skills, I admire your willingness to take it on and your success!
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Old 01-18-2016, 08:31 PM   #3
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Nice save!!!

You have my respect, even if you are a bragger!


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Old 01-19-2016, 10:19 PM   #4
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Good job, a little of your time, and perhaps to initiative to learn something new and vola you up and going.
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Old 01-20-2016, 10:50 AM   #5
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Thanks! I had just finished painting and pimping the new shroud, so I had to keep working to make it run, too.

The shroud story is here, starting at post #16: http://www.airforums.com/forums/f427...roud-4249.html
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Old 01-20-2016, 11:12 AM   #6
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Diy

Well, as one who gets to places where there may not be much service...eg., 1762 Nature Wilde Rd, Coldwater, ON L0K 1E0, Canada, being able to DIY when things need fixing is a very good idea. Mainly, I think it is a matter of going through an algorithm to arrive at the correct solution to problems. And, even if this is done actually following a written set of instructions, it may be very time consuming, yet a lot less so than attempting to find service when none exists within 150 km.

I am certain there must be some books which are useful in this situation, or maybe one of the talented on the Air Forums can write one...... lots of talent here by my observation.

Anyway, congratulations to those who fix it themselves!

Oh, yes, the above venue was in a moho and at 11:00 PM, no water pump working.... one hour to solution.
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Old 01-20-2016, 12:17 PM   #7
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Nice job. I am struggling with the idea if trying to fix my armstrong on the 1973 Safari vs. replacing. Blows air - just not cold. It needs a new shroud as well.
Where did you find parts?
Greg
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Old 01-20-2016, 01:55 PM   #8
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Parts sourcing for A/C

The shroud came from Inland, as previously noted. Note, I picked it up at his shop, as his freight charges seem really high to me.

The R-22 came off Craigslist. It's not cheap, but it's readily available. (about $230 here - cash works real well)

I had a gauge set already, although you can get them off Amazon as well; but get a good American brand - you don't want broken hoses whipping around spewing your expensive freon. (maybe $75 or so)

My vacuum pump is also an American brand (JB Eliminator), used off Craigslist. ($100)

I got the copper tube fittings from a couple different refrigeration supply houses; URS was the most helpful. (<$10)

I had a propane torch from Hazard Fraught tools, and the solder, flux and emery cloth are simple Home Depot plumbing department items.

I think that's about it!

For comparison, folks are paying well over $1500 to have new ones installed. !!
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Old 01-20-2016, 02:02 PM   #9
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Greg1410, send me a PM if you want my phone number; I'm glad to help out!
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Old 01-21-2016, 07:52 AM   #10
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Quote:
Originally Posted by drboyd View Post


A split had developed in the 3/8" compressor suction line, so I cut out that piece of pipe and sweated in a couple elbows with appropriate connectors. While I had it all apart, I oiled both the fan motor bearings and replaced the capacitor.

Managed to get it vacuumed and charged, and now it's making 20 degrees split across the evaporator!

In looking at this unit, it's worth keeping. These are good sturdy old units with real metal and without all the whiz-bang control boards that only die anyway.

Woo-hoo!!

And I promise the jug of R-22 off Craigslist and the used vacuum pump together didn't cost as much as an RV tech would have wanted to fix it.

You did GOOD!!!!! as you won't find an RV tech who even knows how to fix a unit like yours, let alone have the required equipment !!!!!!!

I sold all of my HVAC stuff years ago.


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Old 01-21-2016, 03:55 PM   #11
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Quote:
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...I had a propane torch from Hazard Fraught tools, and the solder, flux and emery cloth are simple Home Depot plumbing department items...
I congratulate you on your repair because the Armstrong units are, in my opinion, worth the effort to keep in service. You can read about how mine is still in operation at the link in my signature.

A note of caution about your copper connections: Refrigeration lines are usually mated using a higher strength filler material than regular water-plumbing solder due to the SIGNIFICANTLY higher line pressure. An oxy-acetylene torch is usually required to melt the material.

The possibility exists that your new line will pull apart at the fittings.

Tom
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Old 01-21-2016, 06:30 PM   #12
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Thumbs up

You're exactly right. I would have liked to braze the fittings, but I haven't done that and I don't have the high-temp torch or the brazing filler. The good news (I keep telling myself) is that it's a suction line instead of a discharge line.

If it blows apart, I still have 28 pounds of R-22 in the jug!




Quote:
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<snip>

A note of caution about your copper connections: Refrigeration lines are usually mated using a higher strength filler material than regular water-plumbing solder due to the SIGNIFICANTLY higher line pressure. An oxy-acetylene torch is usually required to melt the material.

The possibility exists that your new line will pull apart at the fittings.

Tom
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Old 01-21-2016, 06:47 PM   #13
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TomW, I read your linked blog on the A/C. You sure did a lot of work to make yours run right! That's impressive!

As noted elsewhere, (names changed to protect the guilty) Outlaw RV wanted $150 to ship the shroud from somewhere inland from LA to Phoenix. So I picked the shroud up myself at their shop in conjunction with one of my wife's cherished SoCal vacations.

BTW, going up a thousand BTUH on your compressor will push the condenser pressure higher and pull the suction pressure lower by just a little. If it runs, don't worry about it!
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Old 03-22-2016, 07:16 AM   #14
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Armstrong help

I have the Armstrong TR21 12 and the fan isn't kicking on,I can hear a click when I turn down the thermostst so I'm assuming thay's the compressor. Any idea what's wrong with the unit and how can I fix it?
Appreciate any help.
Mike
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