Heating Help

SIZE

@ May 7, 2010 9:22 PM in air conditioning

what do you mean twice the normal electricity, compared to what? please elaborate. high humidity and over-shooting of temp setting sounds to me the unit is probably oversized. Being oversized causes the unit to run shorter run times, preventing unit from pulling the normal moisture out of air. Also being too large can cause space to become overcooled before t-stat can respond. 

stay brite 8

@ March 21, 2010 11:33 AM in Braze Solder R410a

I've been in the industry for 14 yrs and was brought up through the ranks brazing all refer lines with a nitro purge, but within the last 2-3 yrs ive been seeing more and more of stay #8. I've used it on number of jobs, 410a included, with no problems. In some instances it was required that I use stay #8 instead of brazing the lines. Stay brite #8 has a melting temp at 430* and a tensile strength of 15,000 psi vibration making it more than strong enough to handle the vibration of discharge lines. You just want to keep temp of pipe while soldering at 430* or close to it, not to overheat, and get full penetration. That is of course if you are using these lines for refrigeration and air conditioning and not for hanging off a bridge

witch hunt

@ March 21, 2010 11:06 AM in relief valve

with boiler off I fast filled system and found relief blows at 24 psi. system pressure is 12 pump increases it to 22 psi. changed out relief and its been workin fine. thanx 4 the help, after all the work done, it comes down to a defective relief!!

hieght

@ March 13, 2010 2:42 PM in relief valve

the highest pipe is about 3.5' (radiant floor heating) just to and from boiler, and about 3' between xpansion tank and supply. Supply and return piping is 1 1/4" and pipe to expansion tank is 3/4"

WATER FEED

@ March 13, 2010 10:24 AM in relief valve

I installed a tee on suction side of pump approx 24" from pump, in which I come off with length of pipe and tee again for my fill and continue to my expansion tank

relief valve

@ March 13, 2010 2:32 AM in relief valve

I have a 14 yr old 180,000 btu boiler used for radiant floor heating in a 3100 sq ft house. 5 zones. Heat exchanger blew out. Upon arrival found the flue was inproperly ran to roof, prv set @ 3psi, expansion tank and fill piped into discharge side of pump and no air vents in high points of piping. After rectifying all these problems, boiler starts and runs with a 17 degree delta thru boiler, psi on suction side of pump is 11 and 21 on discharge, shuts down off temp at 150 (setting) or satisfies on home stat. Only problem is upon next start up, the relief valve blows and causes knocking noise that wakes the dead every time, even though the psi in heat exchanger is below the 30lbs that the relief is set at. Anyone had any similar experiences? I'd appreciate any ideas. By the way, boiler ran for 14 years before blowing out heat exchanger with those problems mentioned before. ( save the prv setting which probably caused the exchanger to go out)