JStar
Joined on February 27, 2010
Last Post on May 12, 2013
Recent Posts
Duct
@ May 12, 2013 8:20 PM in duct sizing
0.1 inches of static is only appropriate for a total equialent length around 100 feet. Every good ductulator should have a chart to find the adjusted static per different TEL. using 0.1 for wvery job is like using a 1/2" gas line for every furnace no matter what size.Furnace
@ May 12, 2013 5:38 PM in Bryant 90 plus furnace wont fire.
Oh my!!! Put down your tools and turn that furnace off!! You are exercising EXTREMELY DANGEROUS practices by jumping out a limit. Walk away now.Ducts
@ May 12, 2013 5:35 PM in duct sizing
There are no rules of thumb for ductwork. None!The CFM depends on your sensible load. The static pressure depends on blower ability, restrictions in the duct system (coil, filter, etc), and total equivalet length.
There are no rules of thumb for ductwork.
Steam
@ May 12, 2013 10:34 AM in whatever happened to the development of a steam assoc.?
Start it!Boiler
@ May 10, 2013 8:32 PM in No hot water unless calling for heat
Lower the low limit to 140. I think the differential is interfering.Boiler
@ May 9, 2013 6:28 AM in Triangle tube and taco sr 506
You will be best off with a Primary/Secondary piping arrangement AND a mixing valve on the the low temp radiant.Subcooling
@ May 9, 2013 6:22 AM in What is SubCooling
Subcooling gurantees that you have enough liquid at the metering device. The amount of subcooling required depends on the pressure drop through the liquid line. See photo below...It's way too early for me to be doing any kind of real math, but you can calcuate the pressure drop of your LL, then correlate that to a temperature change in refrigerant. If the temperature remains below saturation, even after your pressure decreases, you are subcooled at the metering device. The manufacturer gives us an easy number to aim for, with a fairly healthy margin for error.
Heat
@ May 8, 2013 8:40 PM in Steam and Heat Pump
Right now, there is no way to integrate both systems. I wouldn't do it anyway. Steam needs its own cycles per hour. You're better off doing it manually.Trap
@ May 8, 2013 8:32 PM in Identifying this trap
Found this previously posted image.Trap
@ May 8, 2013 6:12 AM in Identifying this trap
It looks like the pipe inlet is lower than the outlet.Trap
@ May 7, 2013 8:24 PM in Identifying this trap
Looks like it forms a water seal. No moving parts.Burners
@ May 4, 2013 5:33 PM in Power Gas Conversion Burners
I find that the companies who do not install them correctly, and have no idea how to make them run efficiently, perpetuate these rumors so that they can sell entire systems. There is a direct correlation between a technician who bad mouths conversion burners and a technician without a combustion analyzer.AC
@ May 4, 2013 6:19 AM in ideal temp to check A/C
Yes, you raise the head pressure, but you do not raise the indoor temperature or wet bulb. All you change is one side of the system. Are you checking superheat as you do this? What is your theoretical ambient temperature at that point?Yes, it does work. I just don't think it's very accurate. We always schedule a spring startup on winter installs. It protects our work and our equipment.
DHW
@ May 3, 2013 7:52 PM in what size boiler woul you recommend?
Sounds like a job for the Triangle Tube tank-in-tank. Those babies have outrageous ratings at lower BTUH's.Ugh!
@ May 3, 2013 7:48 PM in ideal temp to check A/C
I haaaaaaaate the idea of blocking the condenser. All you simulate is a dirty condenser. You do not change anything useful.Boiler
@ May 3, 2013 7:45 PM in Looking for a Reputable Plumber in Bergen County, NJ.
Steve,I'd be more than happy to offer an estimate. Call any time. 732-494-HELP. You can see some of our job photos at www.facebook.com/ecuacool
Ideal
@ May 2, 2013 6:28 AM in ideal temp to check A/C
If my indoor wet bulb, and outdoor temperature are high enough to give me at least 5 degrees Superheat, I'll test the system. That's usually 55F wet bulb, and 70F outdoor.Steam
@ April 30, 2013 6:45 PM in signing a contract for first time...
Make sure the piping will be black threaded pipe and fittings. We always install an oversized drop header, Vaporstat, and maxxed out main venting on every job, too.Rad
@ April 30, 2013 6:01 AM in Name this radiator!
Can't find anything exact, just similar.Indirect
@ April 29, 2013 8:33 PM in BTU rate Amtrol WH7L
It can "use" anything. What the right amount of BTUH's are depend on your demand. How man showers, sinks, laundry, etc. Size of boiler, and water temperatures will also greatly affect performance.Filters
@ April 28, 2013 9:35 AM in Carlin 1150FD Flame Failures
Sid Harvey's 265-12a 30GPH bio filters.I liked the idea of being able to see the filter after hours of use.
