I have built an out door wood boiler to supply heat to forced air home and shop. The boiler is wraped in all cooper brazed tube in cased in poured refractory masonry jacket with water storage in the basement. The water will have glycol freeze protection.
I was planning a open system with a automotive type coolant overflow tank non pressurized at the highest point in the system to act as a reservoir and expansion tank. I do not want to add a auto fill valve because I want to be aware of water loss and not dilute the freeze protection. The system will not be fired on most weekends.
The system uses two pumps one in the basement return line at the 50 gallon storage tank and one in the shop which has no water storage tank. I am going to put a low water shutoff in the shop water manifold to protect that pump from running dry.
This is the system controls and there locations.
High limit snap disc at boiler outlet to control boiler induction fan
Low temp snap disc to keep system from running when not fired, not sure where to put this or what it should control
Aquastat at manifold inlet in basement to control boiler induction fan.
Flow switch wired in line with aquastat basement manifold
My questions.
Is the open system the best way to go?
Will the system stay purged of air in an open system, if not How should I build in a air purge?
Control wiring setup suggestions.
Are there any other design considerations
I was planning a open system with a automotive type coolant overflow tank non pressurized at the highest point in the system to act as a reservoir and expansion tank. I do not want to add a auto fill valve because I want to be aware of water loss and not dilute the freeze protection. The system will not be fired on most weekends.
The system uses two pumps one in the basement return line at the 50 gallon storage tank and one in the shop which has no water storage tank. I am going to put a low water shutoff in the shop water manifold to protect that pump from running dry.
This is the system controls and there locations.
High limit snap disc at boiler outlet to control boiler induction fan
Low temp snap disc to keep system from running when not fired, not sure where to put this or what it should control
Aquastat at manifold inlet in basement to control boiler induction fan.
Flow switch wired in line with aquastat basement manifold
My questions.
Is the open system the best way to go?
Will the system stay purged of air in an open system, if not How should I build in a air purge?
Control wiring setup suggestions.
Are there any other design considerations
