John Molyneux
Member
One of the things I'm noticing about my new Bosch Greenstar 57 is that it will shut down sometimes even though the thermostat is still calling for heat. For example: it'll be 50F outside and the boiler will be sending out 90F water based on where I've set the curve. (Base Point 80F, Design Day 130F, cast iron radiators, WWSD disabled.) When the t-stat first calls, the boiler runs for awhile (at least 10 minutes or more) but then the boiler and secondary circ pump will shut down even though the zone valve is open and the t-stat is still calling for heat. Then after awhile it fires back up until the t-stat is satisfied.
I'm confused why the boiler wouldn't just run until the t-stat shuts it off. I have the WWSD disabled and the max boiler heating temp set at 175F. I've never seen the boiler get hotter than about 110F unless it's charging my indirect hot water tank.
Any thoughts?
I'm confused why the boiler wouldn't just run until the t-stat shuts it off. I have the WWSD disabled and the max boiler heating temp set at 175F. I've never seen the boiler get hotter than about 110F unless it's charging my indirect hot water tank.
Any thoughts?