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cold starts
Eric Taylor
Member Posts: 33
Hi all,
I'm a homeowner who has been lurking around the wall for some time. I have an old house with a compleatly new heating system (HWBB). The boiler is a gas fired Buderus G124X at 83MBTU net output with a vent damper. The distribution piping is parallel direct return continuously circulated with a 007.
The thermostat used to be a Chronotherm IV, but no matter how I set it up it was short cycling the boiler. It would run for 8-10 min. 3-4 times per hour and never get the temp above 130 unless I raised the setting. I wasn't using the setback feature anyway, so I put in a mercury thermostat and set the heat anticipator at .18 amps (it's controling a Taco relay). Now the boiler runs for 20-30 min. every other hour. The house temp swings a bit more now, but it is acceptable.
The question is are the cold starts going to degrade the life of the boiler? It takes a good 15 min. to get the water temp above 130, and the thermostat is usually satisfied before I hit the high limit (180F). The boiler runs enough to dry out the block and I have a dehumidifier keeping the basement below 55% relative humidity.
If I take the circulator off constant operation I end up with thermal shock when the house calls for heat. I'm thinking that thermal shock is worse than cold starts, so my gut tells me to leave it alone.
What do y'all think?
Eric
I'm a homeowner who has been lurking around the wall for some time. I have an old house with a compleatly new heating system (HWBB). The boiler is a gas fired Buderus G124X at 83MBTU net output with a vent damper. The distribution piping is parallel direct return continuously circulated with a 007.
The thermostat used to be a Chronotherm IV, but no matter how I set it up it was short cycling the boiler. It would run for 8-10 min. 3-4 times per hour and never get the temp above 130 unless I raised the setting. I wasn't using the setback feature anyway, so I put in a mercury thermostat and set the heat anticipator at .18 amps (it's controling a Taco relay). Now the boiler runs for 20-30 min. every other hour. The house temp swings a bit more now, but it is acceptable.
The question is are the cold starts going to degrade the life of the boiler? It takes a good 15 min. to get the water temp above 130, and the thermostat is usually satisfied before I hit the high limit (180F). The boiler runs enough to dry out the block and I have a dehumidifier keeping the basement below 55% relative humidity.
If I take the circulator off constant operation I end up with thermal shock when the house calls for heat. I'm thinking that thermal shock is worse than cold starts, so my gut tells me to leave it alone.
What do y'all think?
Eric
0
Comments
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Oh ....A wise guy !
Answering your own questions will NOT be tolerated on this site ! (just kidding ) I think you got it right . Chris0
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