Joined on February 3, 2007
Last Post on July 18, 2014
@ July 18, 2014 10:45 AM in Constantly purging air in hydronic systemauto vents should be valved off after initial start up, they can draw air in if you have low system press. If your exp tank is on the supply side (not seeing point of no press. change ) ,your NPSP (net possitve suction press. could go into a negative press.causing air to be drawn in.
@ July 13, 2014 10:05 AM in determing to cfmHot wire anemometer. you can get one for $175.00 when reading air flow at diffusers always factor the free air through the grill or diffuser. also what Spence talked about, using fan curve for unit
@ July 2, 2014 6:34 PM in major problems with new carrier systemThere is a chance that the rubber plugs on the end of the line sets were left in by accident, if any brazing was done on line set a partial restriction or floating debris in line set is a possibility. Something floating in the line set or evap coil may allow normal oper at startup and than cause a partial restriction which could cause compressor overheating and failure as the compressor may not cycle off on the low press control. Or in one commercial job I worked on the liquid drier was installed incorrectly and the dessicant beads were found in the system
@ June 2, 2014 2:54 PM in A little guidiance please?You may need a evaporator pressure regulating valve (EPR ) on your evap coils, they will maintain a set evap pressure I would contact the local Sporlan or Alco rep for some application help
@ May 15, 2014 4:58 PM in meterwhats the best meter currently out there now for measuring water flow for example. on w/s heat pumps. also what is the best balancing valve 1 inch which has meter connections
@ May 13, 2014 12:40 PM in RTU vs Mini SplitsI would strongly consider replacing the RTU as it is 12 yrs old ? option 3, well as a service tech I would not want to run into this 10 yrs down the road after the bldg. changes hands and everyone is trying to figure out whats controlling what.
@ May 4, 2014 1:19 PM in Wiring size controversySome installs will require separate wiring and disconnect for the heat strips, check the codes in your area. Also are you figuring a compressor and a evap motor whats the total horsepower and KW
@ April 12, 2014 11:36 AM in lowering steam pressure in a industrial buildingHopefully they are involving a mech.engineer From my experience working with high press. steam, smaller diameter piping sometimes could be used. lowering the main press. with the same size piping may be a concern.
@ April 9, 2014 6:49 PM in New install FurnaceBetter to balance air flow at the plenum using vents or diffusers for balancing can cause velocity noise. although most residential installs don't use these, I would put them in if I was doing a new install.
@ April 9, 2014 10:17 AM in New install FurnaceI would install these dampers on the plenum ahead of the runs easy install
@ April 9, 2014 9:47 AM in Looking for residential installer in Denver, ColoradoPasterkamp Heating or AMS mechanical
@ April 7, 2014 11:03 AM in New install FurnaceI recommend a manual damper installed on the supply plenum for each run for balancing purposes, you can buy a ductulator on line to help you size all duct.
@ March 26, 2014 7:14 PM in Removing and loosening painted radiator condensate trap coversGet the paint off like Jamie said. For the radiator trap I would use my pocket knife and cut the old paint around where the cap assy screws to body ( where gloves ) than use a large socket and breaker bar, tighten first (clockwise) this will help break any paint and rust loose. than loosen using large pipe wrench for backup. For the F&T trap a lot of paint removal and rust dissolver. You may consider replacing the entire F&T trap ( picture on right ) as a lot of the rebuild kits cost almost as much as a new trap.
@ March 19, 2014 6:59 PM in compressorSupco M501 is a good inexpensive meter for checking hermetic compressors. about $160.00 New hermetic compressors will usually show a insulation resistance value of 100 megs or higher, readings of 50 megs or less indicate either the winding insulation is deteriorating or the oil/refrig is contaminated, may be moisture in system. The first step if you get a low reading would be to clean up system (install oversize liquid drier ). If you still get a low reading I usually explain to the customer that the winding insulation is breaking down and that premature failure of compressor is inevitable. I have seen compressors run along time with low readings. This meter can also be used to check motors and transformers. If you are going to work on larger equip. a crank style meter will give you more options AmpProbe makes a good one they can run in the thousands
@ March 10, 2014 6:50 PM in fuel cellA friend called me from another state about a major hvac upgrade they are looking at doing to there church. One person at the church wanted to look into replacing the boiler and emergency generator with a fuel cell ? any input on this would be great. don't know any equip details at this time.
@ February 26, 2014 8:36 PM in Condensate drain trap question:Over the years I have seen hundreds of poorly installed and misunderstood cond. trap installs If the condensate pan is on the inlet side of the fan then a trap is needed or the static of the fan will not allow water to drain. Can you post a drawing of your system. the dimensions of the trap, especially in larger units depends on the air static of the system
@ February 20, 2014 6:17 PM in Waterlogged Compression tanksGo to the main wall jan. 9 2014 compession/exp tanks
@ February 20, 2014 6:06 PM in geothermal vs. airsourceWater furnace makes a good product and I believe they have engineering available
@ February 19, 2014 11:09 AM in geothermal vs. airsourceTwo interesting installs (1) A high end residential ground source heat pump job, In northern Ca with piping set in wells hundreds of feet deep, everthing looked to be installed and grouted correctly, the problem when the soil around the wells was moist the system worked ok, when the soil was dry the units would trip on high head press.in the cooling mode.
(2) A large software co in Silicon valley ca large heat pumps using a pond for the heat source, worked ok until the geese moved in, some of the goose poop ended up around the coils in the pond effecting the heat transfer.
@ January 22, 2014 6:59 PM in securityHas anyone had there e-mail hacked while on this site