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Boiler Operating And Circulating Temperature
Scott Rodriguez
Member Posts: 5
I am a residential owner of a 100 year old 3-story home. It is heated with a natural gas fired hot water boiler and radiator system with cold water static pressure of about 19 psi, a 30 psi safety valve and expansion tank. It is an old B-Line boiler with a circulating pump. Last year a service company replaced the old leaking gas valve with a new unit. At that time he changed the settings on the boiler that effect circulating and pump on/off cycling. The gas firing seems to cycle a lot more now and I'm not sure if this is good or bad, but it is my understanding you want to minimize boiler heating and cooling cycles. I assume the two thermostats on the boiler control the temperature at which the circulating pump turns on and off, also based on the desired temperature commanded by the thermostat control in the living area. The boiler thermostats are currently set at 100 degrees F and 142 degrees F. I'm not sure what they were set at before, but 100 and 135 rings a bell. As you can see, I'm still learning the ropes on the system. Can someone please explain how the (2) thermostats on the boiler effect boiler and gas operation, circulation operation, and how they should be set for optimal performance? Thanks!
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