Coalgun- Puff backs & Explosions

ValterBorges · By: **ValterBorges** On: Sun Jan 01, 2012 3:19 pm

Dayton 1LPN8

I think Rob was not talking about slowing it down as much as controlling the amount of ash dumped/new feed, with on -off cycles. As long as the Sv is not satisfied it would cycle. The off cycle would give stove time to heat up and potentially reach the sv without dumping more.

I guess if you slow it down it may have the same effect.

lsayre · By: **lsayre** On: Sun Jan 01, 2012 3:20 pm

I would have to remove a shroud to see the detail plate on mine, but Shawn at AHS told me they are Dayton Model # 1LPN8 1/2 hp motors with 2 RPM. However, if I go to the Granger website and look them up they indicate that this motor has only 1/20 hp. It does look just like mine though.

http://www.grainger.com/Grainger/DAYTON ... otor-1LPN8

ValterBorges · By: **ValterBorges** On: Sun Jan 01, 2012 3:24 pm

Dayton 1LPN8 by ValterBorges, on Flickr

lsayre · By: **lsayre** On: Sun Jan 01, 2012 3:25 pm

That's the one. It is only 1/20 hp.

ValterBorges · By: **ValterBorges** On: Sun Jan 01, 2012 3:26 pm

lsayre wrote:I would have to remove a shroud to see the detail plate on mine, but Shawn at AHS told me they are Dayton Model # 1LPN8 1/2 hp motors with 2 RPM. However, if I go to the Granger website and look them up they indicate that this motor has only 1/20 hp. It does look just like mine though.

http://www.grainger.com/Grainger/DAYTON ... otor-1LPN8

Yep that looks like it.

McGiever · By: **McGiever** On: Sun Jan 01, 2012 5:27 pm

Yanche wrote:If I were spending any money to slow down the ashing, I would spend it on a variable speed control for the ashing gear head motor. Would someone look at the motor and post the make and model number. I'll look for a suitable controller.

yanche,

Here is one I came across for an unrelated application a while back.

http://www.kb-controls.com/product.sc?p ... egoryId=26

Bob · By: **Bob** On: Sun Jan 01, 2012 6:33 pm

Yanche wrote:If I were spending any money to slow down the ashing, I would spend it on a variable speed control for the ashing gear head motor. Would someone look at the motor and post the make and model number. I'll look for a suitable controller.

Mine is a Dayton, Mod 1CPN8, RPM 2, HP 1/20, V 115, A 1.6

rychw · By: **rychw** On: Mon Jan 02, 2012 9:05 am

I would agree with the fact that the existing ash motor set up allows too much fresh coal to the fire too quickly. I have also noticed that while ashing, if I turn off the grate motor switch after a few minutes, the thermal ash temperature does rise quickly without the grate motor running. That tells me that the motor speed is too fast or is running too long during the ash dump cycle. Again, Yanchee's idea of a controller sounds promissing.

Dennis · By: **Dennis** On: Mon Jan 02, 2012 9:25 am

to all coal gun owners,
is this puffback/explosion problem with the new coalguns or are the older coalguns having the same problems also :?:

coaledsweat · By: **coaledsweat** On: Mon Jan 02, 2012 10:22 am

Dennis wrote:to all coal gun owners,
is this puffback/explosion problem with the new coalguns or are the older coalguns having the same problems also

It is going to be a problem in anything where the coal is fed to the top surface of the fire at too fast a rate/too much at a time. Hand fired, stoker, whatever. You don't see this with underfeed and pusher type systems. It isn't a design issue really as much as an operational one. Coal is grumpy, if you bury a fire with fresh coal it may erupt.

lsayre · By: **lsayre** On: Mon Jan 02, 2012 1:31 pm

Dennis wrote:to all coal gun owners,
is this puffback/explosion problem with the new coalguns or are the older coalguns having the same problems also

Mine was made in October of 2009, and I am not having this problem.

ValterBorges · By: **ValterBorges** On: Mon Jan 02, 2012 2:01 pm

lsayre wrote:Per the response I got from AHS the set value (SV) can be anywhere from 140 degrees to 120 degrees. They suggest leaving it at the factory preset value of SV = 140 unless there are issues with unburned or partially burned coal.

A setting of below 120 degrees is inviting an outfire.

This maybe for an S130 not so much on the S260, the larger mass will keep the fire burning longer.
I've gone as low as 95 during the summer with no issues.
During the two power outages this year the first I was out 5 days the first and 7 days the second.
The first outage when the power came on the fire recovered the second it did not. The outside temp both times was around 40.

ValterBorges · By: **ValterBorges** On: Mon Jan 02, 2012 2:03 pm

lsayre wrote:
Dennis wrote:to all coal gun owners,
is this puffback/explosion problem with the new coalguns or are the older coalguns having the same problems also

Mine was made in October of 2009, and I am not having this problem.

You're probably running the sv lower than 140, keeping your hopper full, and your heat load probably matches the S130 very well and not being lightly loaded.

McGiever · By: **McGiever** On: Mon Jan 02, 2012 7:10 pm

Not a Coal Gun...he has an Axeman-Anderson...

We moved in the house 12 years ago and it was here, didn't know much about them, well still don't just what I learned out here. When we moved in we had that Booming problem, would blow the pipes off and everything. Not good, I didn't know about this forum then, or if it existed 12 years ago. I noticed that when I got coal it would happen for about a month after that, it was so bad the neighbor could hear it and they live 100 yards away. So I switched where I bought my coal, has never has happened again, not even a peep out of the furnace. Probably 10 years of silence.

In the 12 years we have been here it has never been shut down until now. We run it year round for hot water. I have replaced the belts and chain once. Lube the auger rollers on occasion, I tend to use chain lube on them, seems to work well. We have never had the fire go out, and the timer isn't set-up to run hourly, there is one there, but I don't think it was ever used. Coal in ashes out. We burn about 4-5 tons/year for a 2000 square foot house and a lot of hot water with 4 children. We do also burn wood in the winter in a Kodiak stove on the first floor. So the furnace does a lot of idling, use it the most for heat in the fall and spring when a wood fire would just be to much.

Yanche · By: **Yanche** On: Mon Jan 02, 2012 9:22 pm

Bob wrote:
Yanche wrote:If I were spending any money to slow down the ashing, I would spend it on a variable speed control for the ashing gear head motor. Would someone look at the motor and post the make and model number. I'll look for a suitable controller.

Mine is a Dayton, Mod 1CPN8, RPM 2, HP 1/20, V 115, A 1.6

The motor is a shaded pole motor. That's good news because it's speed can be adjusted with the least expensive type of motor control, the TRIAC type speed control. This is commonly used on ceiling fans. See:

http://en.wikipedia.org/wiki/Shaded-pole_motor

Someone with a spare ceiling fan controller give it a try. Be sure your speed control is designed for shaded pole motors and has sufficient power rating for the 1/20 HP motor. Shaded pole motors have low starting torque characteristics. Be sure not to set the speed so low that it will not reliably start the motor. This is unlikely to be a problem because of the gearhead reduction torque multiplication effect.

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