Not holding temperature

 
Jason79
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Post by Jason79 » Tue. Mar. 02, 2021 7:19 pm

Hey everyone!!
I'm looking for some suggestions concerning my Reading Juniata model stoker stove. I haven't had any problems over the past 7 yrs using it during the winter months. I just had to change the stoker motor and I'm having an issue holding temps now. My coaltrol is set to hold 75 degrees and I'm only getting it to reach 70 to 71. I've adjusted the red tab to compensate for the difference in rod lengths between 2 motors. My current settings I'm using are a max of 42 and a min of 6. Here is a pic of the fire.

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lincolnmania
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Post by lincolnmania » Tue. Mar. 02, 2021 8:33 pm

did you lube the combustion air motor recently. Did you clean the ash from under the grate while it was apart for service? are the combustion air holes on the grate clear?

 
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McGiever
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Post by McGiever » Tue. Mar. 02, 2021 9:22 pm

Recent stoker motor change...new one same rpm???

Same rotational direction, might matter???

 
Jason79
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Post by Jason79 » Tue. Mar. 02, 2021 9:36 pm

lincolnmania wrote:
Tue. Mar. 02, 2021 8:33 pm
did you lube the combustion air motor recently. Did you clean the ash from under the grate while it was apart for service? are the combustion air holes on the grate clear?
Thanks for the response!! I did clean all the ash from under the grate as well as making sure all the holes were opened up.

 
Jason79
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Post by Jason79 » Tue. Mar. 02, 2021 9:41 pm

McGiever wrote:
Tue. Mar. 02, 2021 9:22 pm
Recent stoker motor change...new one same rpm???

Same rotational direction, might matter???
Not sure if the rpm is different, I would think it is the same. I wired it the exact same way as the old one...but its a good point. Not sure what would happen if wires were switched around?? I would think it wouldn't matter on this motor. I could be wrong.

 
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McGiever
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Post by McGiever » Tue. Mar. 02, 2021 10:02 pm

Reversing wires has no effect on AC.
To reverse a shaded pole motor one would need to “flip” the laminated core.

Gears internal determine rpm...all those “C” frame motors run at either ~1500-3000 rpm and gears take that down to some calculated single digit rpm for stoking

 
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CoalisCoolxWarm
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Post by CoalisCoolxWarm » Wed. Mar. 03, 2021 10:56 am

Not enough burning coal bed. Most likey cause is too much air.

It's like trying a 50 watt light bulb when you need 150 watts. Not enough heating power.

It looks like you need at least 2x burning surface lit at once.


 
Jason79
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Post by Jason79 » Wed. Mar. 03, 2021 5:14 pm

CoalisCoolxWarm wrote:
Wed. Mar. 03, 2021 10:56 am
Not enough burning coal bed. Most likey cause is too much air.

It's like trying a 50 watt light bulb when you need 150 watts. Not enough heating power.

It looks like you need at least 2x burning surface lit at once.
I ran at this temp, on this stove with no issues for 8 years now. Not sure what changed all of a sudden.

 
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CoalisCoolxWarm
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Post by CoalisCoolxWarm » Wed. Mar. 03, 2021 5:22 pm

Jason79 wrote:
Wed. Mar. 03, 2021 5:14 pm
I ran at this temp, on this stove with no issues for 8 years now. Not sure what changed all of a sudden.
That is why I said air adjustment. It could also need more coal feed, but if it was okay before....

If you cut the air down some, the coal won't burn up as fast and won't send as much heat up the stack. Should result in a larger area burning at a time and better heat transfer. I've seen it lots.

 
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Hambden Bob
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Post by Hambden Bob » Wed. Mar. 03, 2021 5:30 pm

Where did you get the Stoker Motor? Do you still have the old one? Compare spec plates. McGiever may have hit your problem on the head..

 
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Rob R.
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Post by Rob R. » Wed. Mar. 03, 2021 6:23 pm

Some motors have a reversing switch. The one on my EFM does, and when it runs the wrong way the fire is very lazy.

 
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McGiever
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Post by McGiever » Wed. Mar. 03, 2021 11:21 pm

Rob R. wrote:
Wed. Mar. 03, 2021 6:23 pm
Some motors have a reversing switch. The one on my EFM does, and when it runs the wrong way the fire is very lazy.
As stated earlier, shaded pole "C" frame motors can only be reverse by "flipping" the laminate core...take out a couple long screws and flip it put screws back in again.

https://woodgears.ca/reader/walters/reverse_motor.html


 
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Rob R.
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Post by Rob R. » Thu. Mar. 04, 2021 3:38 am

McGiever wrote:
Wed. Mar. 03, 2021 11:21 pm
As stated earlier, shaded pole "C" frame motors can only be reverse by "flipping" the laminate core...take out a couple long screws and flip it put screws back in again.

https://woodgears.ca/reader/walters/reverse_motor.html

Sorry, missed your post. Thanks for the info.

 
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Post by WNY » Thu. Mar. 04, 2021 5:40 am

do you have a feed screw adjustment. Normally with a Coaltrol, you set them at max feed and then let the mIN/MAX on coaltrol adjust it. It could a slightly different RPM, maybe bump the MAX on the coaltrol up a couple points and see if it raises temp, if it does, go a couple more points. let it catch up after a couple hours and see what happens.

 
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StanT
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Post by StanT » Sat. Mar. 20, 2021 10:02 am

Turn the min up,That will help.


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