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Re: T87F anticipator appears faulty
" Apparently, the resistor is in parallel with the switch wire. "
If a resistor of the low resistance value of the anticipator's resistor was in parallel with the actual thermostat's switch the boiler would never turn off with the thermostat's switch opening.
The anticipator resistor is in series with the mercury switch as the wiring diagram shows. So it only heats up during a call for heat and cools down when there is no call for heat.
Normally the small amount of added heat simply causes the thermostat to open just a bit sooner, anticipating the heat to come briefly after the call is terminated. This provides better comfort and tighter temperature control.
109A_5
Re: LP boiler Shuts off completely after reaching room temp
did anyone pull out the burners and clean them? it looks like that needs to be done regardless
mattmia2
Re: Monoflo tee and pumping away
high pressure drop through the monoflo circuit, plus the fact radiators are in series makes the pump selection critical for it to work as intended.
Inadequate flow may leave you with cool emitters at the end of the loop
hot_rod
Re: Main Vent Location
That long white pipe halfway up the wall is NOT functioning as a return. Although it wasn't meant to do that, the new boiler water line is low enough that it is functioning as a steam main extension — and as a result, you can put a big main vent anywhere you want to along it and it will work just fine.
Re: Monoflo tee and pumping away
And the behaviur of a monoflow system has nothing to do with the location of the pump nor even the static pressure in the system. It does, however, have a lot to do with the water velocity in the distribution pipes — so one way to mess it up which your guys may have found is to substitute a very different pump…
Re: LP boiler Shuts off completely after reaching room temp
I wouldn't replace it by shooting the parts cannon. What happens if you replace it and that doesn't fix it? If you have a standing pilot you have to light with a match or lighter, do you??
If you do I doubt the aqua stat is your problem. Post some pictures you probably have a bad thermocouple. The pilot once lit should stay lit
Re: Monoflo tee and pumping away
They don't know what they are talking about.
In most residential systems the pump location doesn't matter because the systems typically have little pressure drop.
But pumping away is better and if possible, you always pump away from the expansion tank.
Re: Hydronic Heat Zone heating when thermostat is off
The black ones don't accept an IFC. As far as I know, the black 007's are shipped with package boilers.
If you can get a press tool, you can install spring checks on the returns.
It's weird that this is the first year its happening. You're sure there's no check valves anywhere that we can't see in the pics?
What boiler is there? Does it have separate BTU outputs for domestic, fin tube, and radiant? It must have because I don't see any mixing valves.
HVACNUT
Re: DIY questions tuning up my furnace
@HVACNUT which is why he should take that valve ot and install a check valve.