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Joined on October 17, 2010

Last Post on August 26, 2014

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Time to ask the Professor.

@ June 21, 2012 8:10 PM in Burn Out

I don't think I know the actual definition either. but I sure know what it smells like when it happens. I know it is a catastrophic mechanical failure of the compressor, but that is about all.


@ June 21, 2012 8:07 PM in Low temperature aquastat

Honeywell T675A1045. I use them for snowmelt, outdoor reset pump control on simple systems and on refrigeration/chiller applications.


@ June 21, 2012 4:34 PM in recovery bottles

As long as the two refrigerants never hit the same cylinder.  Once a cylinder has had either refrigerant in it, you can't put the other in.  So one cylinder would be R410A only and one would be R22 only.  Then if you get a burnout, turn it in for exchange.

I learn something new everyday too.

@ June 21, 2012 4:31 PM in Replacing Propane Cu Piping

NFPA 58 5.9.4 states that all metallic pipe fittings be rated for 125 PSI.  Copper compression fittings do not meet that standard.  (Or so I have been told.)
NFPA 54 lists only brazing and flaring as acceptable joining methods.
Lord knows, that I could be wrong, but up here it is flare only on gas. 

No compression on LP.

@ June 20, 2012 5:21 PM in Replacing Propane Cu Piping

Mark, compression fittings are not allowed on LP. Flare only on soft copper.

I agree. Tell the delivery company about it and they will fix it. If it is at the tank piping, they will should take care of it.

Never Mix

@ June 20, 2012 5:17 PM in recovery bottles

Never ever mix refrigerants in a cylinder. We keep 1- 50# for 22. 1- 50# for 410. 1-30# for odd refrigerants (usually small systems for process refrigeration) these get turned in pretty quickly. If it is a burnout, we also turn that cylinder in soon too. My chiller techs keep several 50's on their vans. They deal with R-407 quite a bit on mid 2000's air cooled McQuay chillers.

Vacuum gauge

@ June 16, 2012 9:29 PM in digital vacuum gauge and nitrogen regulator

Nitrogen regulators are all the same in my opinion. I would invest in a flow meter for nitrogen to use when purging while brazing.

As for vacuum gauge, I have a JB 22. It works, but then again, I don't do as much hands on as I used to. Most of my guys are moving to the BlueVac. This thing is the bomb. The key to vacuum is the hoses. Don't pull a vacuum through your manifold. And always use vacuum rated hoses.

Good Luck.


@ June 8, 2012 9:35 PM in trane tracker system

I concur on the fault 4 being comm loss. I have no idea what fault 31 is.

I saw that Chris, but...

@ June 7, 2012 8:48 PM in Low Temp Baseboard Piping

The outputs are only slightly better than regular high output baseboard. You can get 560/530 out of Petite 9 at 150 F. The Smith stuff is somewhat better, but still not enough to justify the cost in my opinion.

The problem is that it is still convection. In order to create convection, you have to produce a high enough Delta to cause the air to move.

Just one dude's opinion.

Gotta dig out an old plan.

@ June 5, 2012 8:40 PM in Sweat and body heat

Techman, I did the HVAC in a fitness center a few years ago. I will see if I still have that information in the archives (pile of s**t in the back of the shop).

I seem to remember an ASHRAE number of like 950 BTU/h/person in exercise rooms. But don't quote me on that. I don't remember the humidity increase, but it was on the specs.

Maybe I can find it in the morning.

Similar in reverse.

@ May 31, 2012 8:39 PM in Mismatching coils

Up here in Maine, we frequently put a larger evap coil on a smaller condenser. On the coast, most of my customers are on the immediate coast, we have little to no cooling load. What we do is basically drop the interior humidity to a comfortable level and simply keep the indoor temp below 74 deg with Outside Design Temp at 84 deg.

For instance, a 4 ton evap coil on a 3 ton condenser causes longer run times. Thereby increasing the air contact time with the coil. As long as the airflow is set for the smaller condenser then you are ok. So you would set the fan in the 4 ton evap to flow at a 3 ton equivalent CFM.


@ May 30, 2012 8:37 PM in Refrigerant thread sealant

I misread what you were looking for. Hate it when that happens.

I don't use anything.

@ May 29, 2012 7:16 PM in Refrigerant thread sealant

I don't use any special additive and have had no problems. A little refrig oil on the threads of the flare fitting and lock it down. It works. The threads on a flare aren't the sealing surface. The face of the flare is. The threads provide the resistance to separation.

ChrisJ that isn't the case in every jurisdiction.

@ May 29, 2012 6:27 PM in Gas Pipe Sizing

While most people can do whatever they want to their own home with proper permits, gas work is typically not one of them. In most jurisdictions, the gas provider will require that any interior work be performed by a licensed and insured contractor. Why? To shift liability should there be a problem. I would say that your situation was the exception and not the rule.

Forane R-427A

@ May 25, 2012 3:58 PM in RS-44

We have recently done two replacements using Forane's R-427A. Temperature Glide is almost identical. Pressures are identical to 22. We decided to change the compressor oil to be safe. Took out Mineral Oil, went back with POE because I was concerned about oil return. Will check the oil in a month to look for carry over.

I am paying special attention to these two to see how it works. I will keep you posted.

I wish someone would just pick something and lets stick with it. I don't care what it is, just pick something. In a couple of years we are all going to be carrying around 10 different refrigerants to cover all the drop in replacements that we all tried.

Just my $.02.

Timmy is dead on once again.

@ May 18, 2012 8:40 PM in boiler gas pressure

That CB has a gas train on it that per CSD-1 has regulators on it with high and low gas pressure switches among other devices. The owners compliant would lead me to believe that the regulator to the main burner is malfunctioning. Is the pilot affected as well?

There are of specific safety devices on large appliances. If you are not familiar with them, you could wind up another statistic. Seek some help if you are unsure.

Greenhouses are a little different.

@ May 17, 2012 9:20 PM in Heat Load for greenhouses.

While Mark's method is the more scientific approach, the greenhouse people usually have a heating package geared for the horticultural intent.

They are usually done for Seasonal, Local, Tropical, etc... That drives the design temp and humidity. Tropical greenhouses are normally designed for 84 F year around indoor temp. Seasonals are 72 F shoulder and 60 F winter indoor temp.

Greenhouses are the only buildings that I do a radiation only survey on for boiler replacements and even new installations. Because the greenhouse folks always spec the radiation amounts.

Good Luck.

Same time frame here.

@ May 6, 2012 9:59 AM in Why Is the US Always Last

Ditto. I was told late summer 2013.

Nice Point Eugene.

@ May 5, 2012 8:06 AM in bad txv?

I read the OP and immediately thought Air Flow.

Way too many technicians think refrigerant first. I tell my guys to always look at the whole system. But start with the basics, is there enough airflow to facilitate change of state in evaporator? The kinds of problems described in the OP could easily be caused by a clogged filter, a slipping belt on a belt drive system, an undercurrent situation causing the evap fan to spin too slowly.

The morale of the story is don't always assume that the problem is with the refrigerant cycle.

Approval Process

@ May 5, 2012 7:59 AM in Why Is the US Always Last

Chris, if you talk to any of the European executives, they will admit privately that the North American approval process is a significant deterrent to bringing new products over. I had that very same conversation with an executive of one of the companies last month.

The UL/CSA approval process, while necessary, creates a lot of product overhead with redesign and modification. It frankly gets expensive. When you factor that cost into the package, then the very small amount of the American and Canadian market that Hydronics occupies, makes it less attractive.

I will try and find the article that I read in one of the Trade Business magazines recently. It had the breakdown in percentages of US households and heating method. Hydronic was small and shrinking. With the advancements in heat pump technology and the simplicity of dual fuel (gas/heat pump) systems, hydronics is behind.

By the way, we will see this gadget very, very soon. Or something very similar.

We use Sage Timberline, but...

@ May 3, 2012 8:57 PM in Computer programs to run your business ?

Unless you are running 50 employees, it doesn't make sense. We use it to integrate Accounting, Project Management, and Service Management for 70 employees.

It works very well, but is very pricey.

Great Stuff Gordo

@ April 28, 2012 7:06 PM in Where to Go to Get Rare Fittings in Baltimore

We have a supply source up here like that. Completely unchanged since the 60's. If it is old and you need it you can probably find it there. It might be covered in 3" of dust, but it is there.

What will we do when these places are gone?
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