Powervent With Coaltrol

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McGiever
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Location: Junction of PA-OH-WV
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hand Fed Coal Boiler: BUCKET A DAY water heater
Hand Fed Coal Stove: Warm Morning 414A
Coal Size/Type: PEA,NUT,STOVE /ANTHRACITE
Other Heating: Ground Source Heat Pump and some Solar

Post by McGiever » Tue. Dec. 08, 2015 8:12 am

With a PowerVent and a CoalTrol what does the Fields WMO-1 safety kill power to?

1. The CoalTrol power source?
2. The combustion blower motor power?

The CoalTrol knocks off everything and only stopping the blower circuit only would allow the room fans to still remove the heat but feeder would still be able to push coal even with the fire being out.

Who knows what's the safest?
Emptied hopper and Ash pan filled with raw coal is a only an inconvience.
Last edited by McGiever on Tue. Dec. 08, 2015 8:09 pm, edited 1 time in total.


 
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nwaelder
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Post by nwaelder » Tue. Dec. 08, 2015 4:32 pm

McGiever:
The general answer is that the NFPA 211,"STANDARD FOR CHIMNEYS, FIREPLACES, VENTS, AND SOLID FUEL-BURNING APPLIANCES" requires that the fuel supply be interrupted when a mechanical vent system fails.

With respect to the Coal-trol, the specific answer depends on the specific product. The CM2-4-I, where the fume switch plugs directly into the control, will de-energize all motors when tripped, and if the power vent/inducer motor is also powered from the Coal-trol, this one too.

Another arrangement is for power to the Coal-trol to be through the fume switch. When a trip occurs all motors cease and the thermostat loses power as well. This is often done on control retrofits.

The case to watch out for is when the vent motor is on a separate source of power and continues to run after a fume switch trips. This may allow negative pressure in the hopper and cause the fire to chase toward and up into the hopper. In this case, a barometric damper will relieve the excess draft and prevent this. IMO, the best arrangement is for every motor, including the vent, to stop. The fire will go out in a short time and the gas will be contained in the appliance, i.e minimal CO leakage into the house.

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