Security Seal Facebook Twitter GooglePlus Pinterest Newsletter Sign-up
The Wall
Paul Fredricks

Paul Fredricks

Joined on March 22, 2006

Last Post on July 1, 2014

Contact User

Recent Posts

1 2 3 4 5 ... 71 »


@ July 1, 2014 5:33 PM in One of the greatest heating tech' has passed away

It has been far too long since I saw Chris. The last time was probably at Ruth's house, and I haven't been there for a number of years. A great guy with a great sense of humor. A loss for all of us and the industry.


@ April 10, 2014 2:30 PM in Thanks,Dan H.!

Congrats Dan! Well deserved.


@ June 3, 2013 9:58 AM in 275 gallon tank pressure test

Oil tanks are not rated pressure vessels. We've had inspectors in the past request it, but we weren't happy about doing it. If the manufacturer states not to do it, then that is manufacturers recommendation, and following that is code.


@ May 24, 2013 9:08 AM in You like cars?

On our way to Hershey, we made a stop at the Antique Automolbile Club of America Museum in Hershey. A great museum, very well done, and worth the stop if you are in the area. Mostly American cars (I'm more of a European sports car fan) and great displays.


@ May 15, 2013 4:10 PM in r22 condenser

A blocked or stuck TXV will not cause high pressure. I thinks John's suggestion is the only possibility: Pull the whole charge out, evacuate and start over. Make sure the condenser fan is turning the right way and the blade is in the right position, and that the coil is not center loaded. Does the noise start instantly, or does it take a little while?

the day

@ April 24, 2013 9:06 AM in vacuum

We did have one or two units that used R-500 (yellow can?), a blend of 12 and 22 that old carrier equipment used. We also used R-11 to flush systems after a bad burn out. Just pump it in one side and let it dump out the other onto the ground. No wonder the ozone is in such bad shape.

I remember

@ April 23, 2013 2:07 PM in vacuum

Back in the day, the directions that came with Sanyo ductless splits said to leave the suction line port open and crack the liquid valve open for two seconds. The liquid would expand and vaporize, pushing the air out of the liquid and suction lines.
I have never pulled the schrader cores, and never had a problem pulling a good vacuum. I can see it slowing things down a little for the first few minutes, after that the flow rate is so low that I can't see it making a difference. Of course, I'm talking residential sized units.
And, it seems to me, that 410 shouldn't be that much of an issue. If the system is empty, just purge nitrogen through the system. There shouldn't be much, if any, 410 holding on to moisture. Sure, there will always be a little, but I can't see it making that much of a difference. I always pull down to at least 500 microns, 250 is better still.
Just my 2 cents.


@ April 18, 2013 11:17 AM in Boston Tragedy Hits Closer To Home

$77,000 raised in one day! Keep it going!


@ April 17, 2013 3:45 PM in Boston Tragedy Hits Closer To Home

Every little bit helps. And he will need a lot of help.


@ April 4, 2013 7:13 AM in I've always found better musicians here!

That thing must take a lot of lung power. I'd think an air compressor might be a good idea.
Love the Ian Anderson pose!


@ April 3, 2013 7:54 AM in brazed fittings ok for oil line?

Back in the 80's, if we had an issue with the fitting or line at an inground tank, we'd dig it up, cut the lines, install new drops into the tank and braze them. Never had an issue. Of course, for the last 20 years or so we'd just get rid of the tank. But that was the good old days.


@ April 2, 2013 11:36 AM in brazed fittings ok for oil line?

NFPA says that brazing materials uased on oil lines must have a melting point over 1000°


@ March 22, 2013 7:50 AM in I've always found better musicians here!

You can't tighten a pipe wrench with a banjo, but you might be able to tighten a banjo fitting with a pipe wrench.


@ March 20, 2013 10:16 AM in I've always found better musicians here!

Monday night 5- 20


@ March 19, 2013 7:38 AM in I've always found better musicians here!

This is my band. We're playing the OESP convention in May:


@ March 4, 2013 10:51 AM in Toyotomi OM-180 down-fireing

I assume listing covers everything. If the unit was rated with only a specific nozzle you'd have to use that one. Any time you substitute a different part that was not approved originally I would think that would be a problem.
Yes, the price of the nozzles is nuts, and it's gone up quite a bit in the last few years.


@ March 4, 2013 8:31 AM in Toyotomi OM-180 down-fireing

I've seen that the excess air is very high with these units and mentioned it to them, but never got a resolution. I'm surprised that you can get away with a standard .75 nozzle. Never tried it, and probably never will. The unit is not UL appoved for that nozzle and we try to avoid lawsuits. If it were in my house I'd give it a try.

Wire Nut

@ March 4, 2013 7:20 AM in Alex Marx!

Have a great birthday!


@ February 28, 2013 12:52 PM in Burnham V7

I've had my V74 for a while now with no issues. It is a bit oversized so I have it down fired and the aquastat is set to 110° - 160°. Thermal change kills these, so anything to limit that helps.


@ February 20, 2013 9:37 AM in Toyotomi OM-180 down-fireing

The 148 and the 180 are basically the same. the 180 has an adjustable differential that we usually set at 18° for heating applications. We did use the 180 for hot water production, but I think the 148 is better due to the piping arangement which helps limit the flow.
You have to efficeincy test the unit, just like any other. Not that you can adjust anything but pressure. But you have to be sure it's running right. I typically have the home owner run the hot water at a sink until the boiler is cold, then max the aquastat to get the longest run time possible, usually about 2 minutes. Efficeincys run around 82%, IIRC. In our tests, vs an Aero 30 gallon, it used about 30% less oil.


@ February 19, 2013 1:28 PM in Toyotomi OM-180 down-fireing

We put in a bunch of these units over the past 6 years or so. We have about 50 to 16 148's out there for hot water, and we have 20 or so 180's doing either hot water or as a boiler. All of them short least compared to a "normal" unit. But they were designed to operate that way. The only way to stop the short cycling would be to crank up the flow rate through them.

Don't touch it

@ February 19, 2013 7:41 AM in Toyotomi OM-180 down-fireing

It is a special nozzle.  .85 60° XAJ
The pump pressure is 192 PSI and you have to use their pressure gauge to check it. The fittings are metric ball flares and no one has the parts to adapt to them.
They short cycle. That's just how they work. It's not an issue as far as operation goes.
1 2 3 4 5 ... 71 »