Thanks to all of the help in the past. New problem has arisen. I have a Biomass 40, with a 500 gallon buffer tank. I put a T&P valve on the tank. The expansion capacity is 4.5% of the estimated total volume of hte system, actual capacity, bladder tanks.
If I run my temperature on the boiler to 175, my T&P valve will release. Now that number is down to 162psi. The only T&P to blow off is the one on the tank. There is also one on the boiler. When the tank T&P blows off, the pressure on the boiler reads 20 psi or so (1.5 on the gauge).
Any ideas what could be causing this? Thanks for your input.
Bill
If I run my temperature on the boiler to 175, my T&P valve will release. Now that number is down to 162psi. The only T&P to blow off is the one on the tank. There is also one on the boiler. When the tank T&P blows off, the pressure on the boiler reads 20 psi or so (1.5 on the gauge).
Any ideas what could be causing this? Thanks for your input.
Bill