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Techman

Techman

Joined on December 30, 2005

Last Post on September 1, 2014

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two metals

@ September 1, 2014 9:37 AM in two different metals

What is the purpose of di-electric fittings on DHW units? Part of my job function onboard a WW2 submarine was to inspect/replace all sacrificial zink elements on a routine inspection. Electrolis does take place!

Short?

@ August 30, 2014 8:55 AM in carrier packaged unit......electrical short...HELP

A couple of things. Is the line voltage also 208v ?, is the xformer a multitap ? Is the 24v really 24v? Install a 10 loop multiplier of wire on each of the xformer ,y1 and y2 contactor colis and the cond fan motor contactor coil if there is one, then start the AC and bring on 1 stage at a time and read the amps. The "multiplier" has to be just big enough to go around the amp meter jaw.
A short would be a "short to ground" or a "turn to turn " , you might have an "over amp " situation .

Stupid is as Stupid does.

@ August 26, 2014 1:10 PM in Stupid is as Stupid does.

A midnite thief struck one more AC cond unit. .Someone disconnected the top/cond fan motor assembly and put it off to the side ,leaning gently against the bldg. The screen that kinda protects the cond coil fins was unscrewed and put off to the side also. The comp discharge line was crimped/cut and the LL as well . Then they stole the cond coil only, they didn't take SL &LL that was on the wall, 15' of it, this is on a 4t 10seer system. How much did they make? Aluminum fins on copper tubing! They were neat!

Which switch?

@ August 25, 2014 4:01 AM in NO A/C

Assuming it is a press switch, you can try a "Tattle Tale" device. It goes across the contacts/wirers of the press sw. & when a sw. opens the Tattle Tale blows, like a fuse.

Pipe wrench's

@ August 21, 2014 1:49 PM in Not the Usual Failure

I gotta ask, what's the difference between "Skuld" and "Stuart" ?

Drain

@ August 21, 2014 1:39 PM in condensate drain ?

The trap was down by the floor ? I'm not sure about that. The I&O manual should show a diagram of the recommended trap setup. All traps collect debris and should be cleaned/flushed out once a year. I make my own trap w/ a 3/4 pipe plug for the cleanout. With a piece of plexi-glass you can see the water backup while the system is running. What do the evap coils look like?

Drain water

@ August 21, 2014 8:50 AM in condensate drain ?

That's a lot of build up in the drain pan. And a lot of stuff to backup ,causing a trip. Where is it coming from? How much stuff is in the actual condensate drain line leaving the unit? Can you check the level of the evap coil/drain pan? How are the evap coils themselves? The air filters? On P traps , I think having a trap both ways is better. When air is blowing out , the water is pushed away from the drain pan hole ,building up in the rest of the pan, the other way air is getting sucked in causing a water backup, pulling water away from the drain hole.The return air airflow also helps to keep the water in the pan. A dirty filter adds to the problem, sucking more air thru the hole.

drain pan

@ August 21, 2014 2:11 AM in condensate drain ?

Does this system have a P trap in the condensate line?

Too late? HA!!!!

@ August 18, 2014 10:53 PM in Oil additive/bonding/gasket friendly/"O" ring friendly/

I woun't think of you that way!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

OIl additive, yes?, no?

@ August 17, 2014 7:40 PM in Oil additive/bonding/gasket friendly/"O" ring friendly/

I agree w/ meplumber! Copeland Compressor Co. says the same thing! I am Copeland trained and educated! COMPRESSOR MANUFACUTORS WILL VOID ANY COMPRESSOR WARRANTY IF ANY OIL ADDITEVES ARE FOUND IN THE COMPRESSOR UPON INSPECTION!!   BELIVE THAT!!!!!!!!!!!!!!!!!!!!!!
When a family owned/operated delicatessen/bakery/kinda  business has a "tight" 1/2, 3/4 ,  1hp  comp and under , and were are talking up to 6 grand, I added that #88 "just to see" and the comp lived another couple of years. This was with the customer as a co-conspirator. In a regular local bar ,they have "beer coolers" its usually better to replace the entire worn out beer cooler. So, Hay bartender! Owner! How about this stuff!!!!!
Most residential AC has ALL of the seals and stuff replaced w/ the upgrade of equipment. But on a 15 year old res AC:  with 20lbs of r22 and a can of this "magic seal" stuff vs a new system was ,again ,in cahoots w/ the customer.
Now, Chris, my friend , with the stuff that you work on , that "do not add additives" rule should be enforced , will be enforced! I TOTALLY agree !

Super Change

@ August 16, 2014 6:53 AM in Oil additive/bonding/gasket friendly/"O" ring friendly/

Be careful there McGee, Supco said that the #88 oil additive does not bond Mineral oil to AB oil or to POE ,or AB to POE as SUPER CHANGE claims. And #88 will not have an effect on O rings, Teflon seals( Schrader inserts) etc ,again, as SUPER CHANGE claims. Changing an inwarranty comp is a pain in the butt. Supco did say that #88 is miscible with each individual oil.

Supco88 vs SUPER CHANGE

@ August 13, 2014 9:11 AM in Oil additive/bonding/gasket friendly/"O" ring friendly/

My 1st couple of bosses used Supco88, I've used it a few times . Not bad .I am not aware that the supco88 is an "oil bonder"and "gasket lover". The Super stuff is supposed to bond all oils and eliminates changing the oil and gaskets/Schraders and others. My 1st time using ICOR's r22 replacement blend, I was back 12hrs later replacing the old LL Solenoid Valve . I WILL try the SUPER CHARGE as a trial/error in cahoots w/ the local Sid Harvey manager. So, I have not tried it yet .Compressor mfg's. do not like oil additives! NCIS McGEE?

Heart

@ August 12, 2014 1:27 PM in Heart attack

Thanks,guys! What is that SWEI?

Heart attack

@ August 12, 2014 8:27 AM in Heart attack

My best friend/pal/buddy/confidant/mi amigo is in hospital in very critical condition. he was seeing a Doc. Get yourself checked out, its painless. I knew all 5 of his kids before they were born. Damn .

3 phase power

@ August 12, 2014 5:06 AM in Books/Manuals on 3 phase electric

That is an interesting site SWEI ! MickeyB ,what do you plan on doing w/ this info?Do you work on 3ph.motors or ACR compressors? Stuff like, the voltage imbalance is only 2% for 3ph ACR comps? Or failures in 3ph stator windings?

A few reasons

@ August 11, 2014 9:47 PM in 6 dead 25hp ac comps in 12 years on one system

Air handler return was 6" off a block wall. That's 10,000cfm. It was a "Hot Deck/ Cold Deck" set up
System was run low on Freon, could not pump down into undersized receiver.
Oversized "double suction riser" , capped off one pipe.
Hot Gas Bypass/Capacity Control set incorrectly. Found that sucker at 4 in the am.Tripping the oil failure safety.
Gallons of oil in the evap, 40' below rooftop cond unit.
 Plugged evap/cond coils
Wrong "cage" assembly of TXV.

6 dead 25hp ac comps in 12 years on one system

@ August 11, 2014 8:06 AM in 6 dead 25hp ac comps in 12 years on one system

. My one and only comp ( comp #7) lasted 18 years! We then shut down the system , dismantled everything and installed 5 little systems of 5t each! That was "public money" that bought all of those dead comps!

Oil additive/bonding/gasket friendly/"O" ring friendly/

@ August 9, 2014 8:56 AM in Oil additive/bonding/gasket friendly/"O" ring friendly/

teflon friendly/ neoprene friendly stuff called SUPER CHANGE ! When retrofitting an R22 system you don't have to change out the oil or any of the above! Has anyone used this stuff? It bonds mineral oil, alkylbenzene , and POE to each other, so no oil change out.  Its by CLIPLIGHT Co. I've used their pin hole in evap coil  sealing stuff with good results this year on one system. No more Freon leaks in the evap , so far.

A 27 year old problem

@ August 9, 2014 2:34 AM in A 27 year old problem

A local Animal Hospital has had an "inadequate cooling" problem ever since the AC was installed in 1987. My dog , Freon, needed a new Vet and the Dr. needed a new AC guy. Freon is fine and the AC is in recovery. The " V " coil ( upside down "A" coil has the return air going into just one side of the evap coil, bypassing the other of the coil.The Dr. just smiled and asked if it could be fixed, and I just smiled also.

overheating

@ August 6, 2014 9:41 PM in Compressor Overheating and Rfrig. Oil

Geez Harvey, I asked you to tell us, you SHOUTED that info out to us . GOOD INFO, REAL GOOD . Now how many really care? ALL OF US SHOULD CARE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

overheating

@ August 6, 2014 8:56 PM in Compressor Overheating and Rfrig. Oil

For those of use who can't read , do tell use what that magic # is, Harvey!!So , is the SH of the evap, critical? the SH of the Suction Line? the SH's of the comp critical? or the TOTAL SH in the discharge line? Good thread Harvey!!!!!!!!!!!!!!

TIF ELECTRONIC SIGHT GLASS

@ August 6, 2014 7:48 AM in TIF ELECTRONIC SIGHT GLASS

Seeing into the LL all the way from the cond unit  to the TXV would be cool. Like a glass LL. The next best thing is the Electronic SightGlass ! See that SC go by? Just right! The TXV needs a full LL no matter what!.Use this tool along with the SC of the cond unit.
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