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Central Boiler / Re: Pumps in summer
« on: July 14, 2012, 12:00:34 PM »
Hi everyone,
yep I'm new here and have been using the Central Boiler brand since 2005. Its a 1999 year CL40. Came with the house and heats the infloor system as well as DHW.
We really like it and have had few problems but this topic of running circulating pumps caught my attention. Our place is off the grid which means I am always looking for ways to keep electrical loads to a minimum. Initially the Grundfos circulating pump ran 24 hour a day. This did not look right so I hooked up a Taco relay box which fired up all the circulating pumps only when there was a demand from one of the zones. It has been this way since 2005 and there has been no problems of overheating etc. Even replaced the big circulating pump from the boiler to the house with the smaller Grundfos and suffered no reduction in performance at a 1/3 savings in electrical output.
So, I was talking to the Central Boiler people recently about the faulty temp display and mentioned the pump doesn't run 24/7. He acted concerned with overheating. This model has the simple side draft intake and fixed aquastat that shuts off at ~ 183. The displayed temp has never risen above 186 after the damper closes and typically only goes up to 184-185. Maybe it is the lower quality wood we have here? We are in AK and run this thing all year since there is currently no alternate domestic hot water heating source. Now I'm seeing this topic and wonder if everyone is running 24/7 circulation?
As for the OP question; is the need to run the pumps all year, according to the manufacturer and installers, to keep the pumps from seizing or are there other reasons?
yep I'm new here and have been using the Central Boiler brand since 2005. Its a 1999 year CL40. Came with the house and heats the infloor system as well as DHW.
We really like it and have had few problems but this topic of running circulating pumps caught my attention. Our place is off the grid which means I am always looking for ways to keep electrical loads to a minimum. Initially the Grundfos circulating pump ran 24 hour a day. This did not look right so I hooked up a Taco relay box which fired up all the circulating pumps only when there was a demand from one of the zones. It has been this way since 2005 and there has been no problems of overheating etc. Even replaced the big circulating pump from the boiler to the house with the smaller Grundfos and suffered no reduction in performance at a 1/3 savings in electrical output.
So, I was talking to the Central Boiler people recently about the faulty temp display and mentioned the pump doesn't run 24/7. He acted concerned with overheating. This model has the simple side draft intake and fixed aquastat that shuts off at ~ 183. The displayed temp has never risen above 186 after the damper closes and typically only goes up to 184-185. Maybe it is the lower quality wood we have here? We are in AK and run this thing all year since there is currently no alternate domestic hot water heating source. Now I'm seeing this topic and wonder if everyone is running 24/7 circulation?
As for the OP question; is the need to run the pumps all year, according to the manufacturer and installers, to keep the pumps from seizing or are there other reasons?
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