Best Of
Re: Thermostat Issue
2 thermostats is the least invasive, and MacGyver doesn't get involved. You said "Door #3, but the heat pump might help when it gets really cold. Is this your radiant design and install? Wondering why the heat pump if it's only used for cooling. Rebates?
HVACNUT
Re: Chimney condemned; wood stove conversion question
I would definitely get a second opinion on that chimney.
But no, just putting a screen over the exhaust from a wood stove isn't going to fly. That is NOT a safe option.
Re: Help choosing a new boiler (Part 3 - the Results! and more questions :)
Set the heating circulator to "LOW"…………it is currently on "HIGH". Very simple. This will slow the flow rate and raise the DT so the return water is cooler. You are looking for 15-20F for a difference between supply and return. Don't listen to them if they claim it won't work.
(Leave the circulator for the indirect on "HIGH".)
LRCCBJ
Re: Adding Hydronic Loop Before HX?
sorry everyone I see I left out some critical detail. It is my assumption HX is to isolate very old radiant floor, likely non oxygen barrier pex. Bosh boiler is not a combi (PN is on schematic but it is KBR 21-3)
Rvacinek
Re: New Boiler - Radiator Screaming
Anyone heard from OP? I would like to hear how things are going.. New here and I posted once a few months ago but resolved my problem. I've been interested in OP's plight and all the great information on here.
Re: Thermostat Issue
@Alan (California Radiant) Forbes
What is the net result you want to accopmplish?
- To have the heat pump be primary when above a certain outdoor temperature an the Radiant to be the primary below that temperature
- Have the radiant be the primary all the time and only use the warm air when the radiant cant keep up
- Have the radiant as the primary and not use the warm air in the heating season.
I can draw you a diagram to do 1, 2, or 3.
Need model number of the air handler and the outdoor unit. It gets tricky if the system has a variable speed ECM blower motor. But it can be done.
Re: Thermostat Issue
I think @ratio has the right solution. If you want floor heat priority, you can also move the floor heat to W1 and the air handler to W2 and Aux. You would still need a normally closed relay to de-energize G when W1 is on.
Kaos
Re: Thermostat Issue
Aux is aux, the thermostat is working as designed. What the customer probably wants though is for the floor heat to be primary and the heat pump to be aux.
That thermostat is just sending an on/off signal to the heat pump, so there's no reason why the heat pump couldn't be aux in heating mode. However, there's no setting that allows you to use the aux device for cooling in the summer, so you'd have to rewire between seasons.
What kind of heat pump is it? Would it be happier with a sensing thermostat that allows it to modulate to meet load rather than an on/off? If that's the case then two thermostats set a degree or two apart, with the floor higher, is probably the best solution.
One other note: is the floor using electric resistance heat? I can't count how many times I've had guys say that they'll configure the floor heat so it's only on "to take the edge off" but that the heat pump will do most of the heating. That's not how heat works.
