The bit of a delay in "fan on" condition will allow the three way to fully open to the coil, close to the return line and have a full head of hot water INSIDE your heat exchanger by the time the blower starts. This bypass, diverter valve or three way valve will be controlled by your room thermostat.Ĭonsider a "timed on" 24v relay wired in parallel with the three way valve to close a set of contacts to energize your air handler blower. It is a simple three pipe valve, one to the supply and one to the coil and the other back into the return line giving continual flow of hot water within a few feet of the heating coil. consider a "bypass" or "diverter" valve (24v) piped in the circuit at the air handler (gas furnace in your case). The above aquastat will start and run the pump 24/7 as long at the water is in between on/off temps. Of course this is not needed if you are circulating Propylene Glycol. Parallel those contacts with a simple "outdoor" thermostat that closes on a drop in temp and set that control at 32 degrees to start the pump to get water moving in case of extended "no-fire" time in the middle of winter. What you may consider would be a simple aquastat to turn on the pump when the supply side of the boiler piping warms and off as it cools with diminishing fire. You should NOT even consider an automatic damper in the flu pipe for the above listed reasons.my. ![]() When the wood boiler one calls for heat I assume I will wire it so the circulating pump turns on and just the blower fan in the furnace as well.Īm I overlooking anything when it comes to controlling the boiler?Īlso if in the future I wanted to put radiant floor heat in or hot water radiators how do I set up the temp and pump control on that? I assume due to the long time from when it starts heating till the heat is actually felt that a regular thermostat isn't used? I will have two thermostats one that I have now to control the furnace will be set at a low temperature and on for the wood boiler that will be set to the temp I want in the house. ![]() I will have to put something between the aquastat and damper controls if the aquastat can't run on 24 volts.įor the furnace I plan to put a heat exchanger in the plenum of my furnace. I already have a couple aquastats(I'm not sure what voltage they are for) and two honeywell 90 degree damper control that are set up for 24 volt. When the aquastat says it is too cold the dampers will open and when it is at the set temp they will close. I plan to use an aquastat to control two dampers, one on the air into the fire box and one on the chimney on the way out of the fire box. ![]() My plan is to have it set up with natural draft (no fan blowing into the fire box). I don't have any concerns about building the boiler, my concerns are the controls for it. I think I have it all figured out but figured I would run it past you guys to see if it will work.
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