Problem With Primary Zone

Problem with primary zone

PostBy: thegreatone On: Fri Mar 31, 2017 9:12 am

My primary zone doesn't seem to be heating properly. The circ pump runs inconsistently. I changed the pump and the issue continued. It runs for a while then stops before the thermostat is satisfied. All other zones run fine. I removed the thermostat and bugged the wires together and the pump didn't run (boiler was at high temp limit). I put the thermostat back in and it ran (pump only). Sometimes it runs with the boiler and sometimes it doesn't. When it runs it really doesn't run long enough to heat the entire zone. It usually isn't an issue because I have a TLC 2000 in that zone but I was going to shut it down and use the EFM. I always thought this zone wasn't heating correctly but like I said really was never an issue. Now I have to fix it because its driving me nuts. I also bled the zone to rule out air lock. Any help is appreciated. Thanks
thegreatone
 
Stoker Coal Boiler: 1984 EFM DF520 & 1986 EFM DF520
Hand Fed Coal Stove: Harman TLC-2000, Hitzer Model 82
Coal Size/Type: rice/pea/nut

Re: Problem with primary zone

PostBy: thegreatone On: Fri Mar 31, 2017 9:29 am

I just move the wires off the pump from a different zone onto the pump on the primary zone and it works correctly. Its gotta be a wiring issue. I'm going to go over the wiring.
thegreatone
 
Stoker Coal Boiler: 1984 EFM DF520 & 1986 EFM DF520
Hand Fed Coal Stove: Harman TLC-2000, Hitzer Model 82
Coal Size/Type: rice/pea/nut

Re: Problem with primary zone

PostBy: freetown fred On: Fri Mar 31, 2017 9:30 am

Nice T--good luck with it.
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut

Re: Problem with primary zone

PostBy: lsayre On: Fri Mar 31, 2017 10:24 am

Intermittent running sounds like a short. Looks like you are on the right track.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Problem with primary zone

PostBy: Rob R. On: Fri Mar 31, 2017 2:42 pm

If you have the circulator wired to C1/C2 in the triple aquastat, the behavior you described will happen if the boiler temperature drops below the low limit setting. This is intentional.

If you want to prevent this, you can do a few things.

1. Reduce the flow rate of the zone.
2. Increase the feed rate of the stoker.
3. Reduce the low limit setting (assuming you do not use tankless coil).
4. Wire this zone off a separate relay.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Problem with primary zone

PostBy: waldo lemieux On: Fri Mar 31, 2017 4:14 pm

So you are running a Argo or similar zone controller for multiple zones?
waldo lemieux
 
Stove/Furnace Make: efm
Stove/Furnace Model: s-20