I need a better thermostat
I have a large 2 story house.
Both floors have train HVAC systems there about 9 months old.
I have a 500 gallon wood boiler that I would like to use for heat. I did have the heat exchangers installed when they installed my systems.
As far as the controls Iím running 2 thermostats on both units; one for the train and one for the wood boiler.
I would like a thermostat that would control both systems and have a water temp sencer so if I donít have the boiler running then it would use the heat pump.
I do have it working the way I want it to right now but itís using 4 relays on both systems and it dose not always work right.
Anyone have any solutions for me? I talked to the people at the train place and no one knows of anything to help.
Is there an electrician in the house?
Hmmm. Seems to me that only 3 relays are required:
1 double pole on the thermostats to potentially close the TT circuits for the boiler and the heat pump when the thermostats call for heat
1 aquastat which opens on low temperature mounted on the wood boiler and in the TT circuit for the boiler. This aquastat prevents the wood boiler circulator from running when the boiler temperature is below the set point.
1 aquastat which opens on high temperature mounted on the wood boiler and in the TT circuit for the heat pump. This aquastat prevents the heat pump from running whent the boiler temperature is above the set point.
Of course the set points for each aquastat should be identical.