Harman Shutdown on Warm Days

[Dougsey]

Does anyone know what causes the stove to shut down on warm days when in Room Temp/Auto ignition mode?

Like temp rise a certain number of degrees above set point or something?

And what conditions cause it to re-light again?

It was fairly warm and sunny here the past couple days and my Accentra has burned on maintence burn with the
room air blower off all afternoon but no shutdown. But the temp only rose 2* above the set point so maybe that's not high enough to initiate a shutdown.

 

[Southbridge06GT]

Mine seems to run just about all day on low burn. I wish it didn't but it never gets real warm i here

 

[toastyinri]

Does anyone know what causes the stove to shut down on warm days when in Room Temp/Auto ignition mode?

Like temp rise a certain number of degrees above set point or something?

And what conditions cause it to re-light again?

It was fairly warm and sunny here the past couple days and my Accentra has burned on maintence burn with the
room air blower off all afternoon but no shutdown. But the temp only rose 2* above the set point so maybe that's not high enough to initiate a shutdown.

this is not an exact science because of all the variables that would enter into it, but with my stove I've noticed that my stove will run on maintanance mode if the temp is within about 2- 5 degrees of what I've set it at on the stove.(usually at 72 deg.) if my home maintains the temp for an amount of time, and outside temps are rising the stove will shut down. (usually at mid-day) it will then restart when the temp in my home goes below approx 5 to 7 degrees of what I've set it on the stove. (usually before sun set) this only happens at the start and end of the burning season when outside temps remain higher longer. I think heat retention within the home is probably the biggest factor.
the amount of times doors are opened and closed, how well insulated your home is, fans running, the sensor, the ESP.......etc. probably contribute to it all. Like I said...it's not an exact science.

 

[ugenetoo]

one way to check is to set it 5 degrees lower and see if it does shut down.
ive been told by the dealer that the stoves try to maintain a fire as long as possible without overheating the room in order to save using the ignitor and also fuel.
try posting at iburncorn.com under the harmon thread and charlie will esplain everything.

 

[wwburning]

What I like to do is once I get the stove up and running before I go to bed I put it on manual room temp @72-73 instead of auto. This allows the stove to run on it's lowest possible setting when it reaches room temp without cycling the ignitor on several times overnight. Also keeps my bedroom which is 3 rooms away @ 68-69 all night even when it's in the 20's. Sometimes on auto, the bedroom will dip to 65-66 so the wife is happier.

 

[toastyinri]

What I like to do is once I get the stove up and running before I go to bed I put it on manual room temp @72-73 instead of auto. This allows the stove to run on it's lowest possible setting when it reaches room temp without cycling the ignitor on several times overnight. Also keeps my bedroom which is 3 rooms away @ 68-69 all night even when it's in the 20's. Sometimes on auto, the bedroom will dip to 65-66 so the wife is happier.

I live one city over from you in Warwick which in Rhode Island terms is merely a stones' throw away.

What brand stove are you burning?

 

[toastyinri]

oops, I see your burning a harman p-61.
I'm burning a Harman advance.

I've yet to have mine turn off and restart during night time running at a set temp of 72. I run at auto everything...set it and forget it mode.

 

[The Patriot]

Does anyone know what causes the stove to shut down on warm days when in Room Temp/Auto ignition mode?

Like temp rise a certain number of degrees above set point or something?

And what conditions cause it to re-light again?

It was fairly warm and sunny here the past couple days and my Accentra has burned on maintence burn with the
room air blower off all afternoon but no shutdown. But the temp only rose 2* above the set point so maybe that's not high enough to initiate a shutdown.

I can't speak for the Accentra, but I believe it runs the same as the P68 or P61A.

Once the room reaches a certain temp over the setting, it will shutdown until the temp falls back to the set temp. If not, the stove could be running when it doesn't need to. It's possible to have a cold morning in the 30's, you leave for the day and it warms up to the 70's or 80's in the middle of the day. I don't know about you, but I'd be happy if my stove turned off automatically. Mine does almost every weekday anyway. I turn down the stove to the low 60's when I leave for work.

There have been a couple detailed postings about how it works exactly. I'm still searching. Don't quote me on above, I'm going on memory.

 

[The Patriot]

Quoted from "Pelletheat" on this thread....

https://www.hearth.com/talk/threads/964/

"Room Temp”

The feed rate setting on Harman pellet stoves is based on a 60 second cycle. When the stove has a demand for heat based on your “Room Temp” setting of 74* and is 3* below the setpoint the stove will initially run the augar on a 60 second cycle, feed rate of 4 means the augar will run for 40 seconds, idle for 20 seconds. This cycle continues until the temp being registered by the room sensor approaches the temp setpoint on the stove, before the temp over shoots the target setpoint the circuit board over rides the initial feed cycle and starts to maintain the heat output by running the augar only to keep the room temp satisfied, this will vary within the 60 second cycle. When the room temp is satisfied the stove will run the augar approx. 7 seconds every minute to keep fuel in the burnpot. If you are running your stove in “Auto” with self ignition the stove will shutoff when it “CAN NOT” maintain a temp within 3* (77*)of your setpoint. Mostly on warmer days in the spring and fall. Having the feed rate set to low will not allow the stove to bring the room temp up in a reasonable amount of time, thus it will take much longer to achieve a setpoint with a feed rate of 2 because the augar will only cycle fuel for 20 seconds and sit idle for 40 seconds. You can potentially consume more fuel with a low feed rate setting, because you limit the max BTU output of the stove.

 

[Dougsey]

Thanks. I think it needs to warm up just a bit more for my stove to shut down during the day.

I don't think my room temp has risen beyond 2* over my set point yet.

My set point is 72 so I'll wait until I see my room temp rise to 75 or 76 and see if it shuts down.

 

[The Patriot]

Again, I would recommend turning the stove down when you are leaving for long periods if you can.

I set all my oil boiler thermostats to 55 in the house (in case the pellet stove runs out of pellets or has another problem). So when I leave for work in the morning, I turn the stove down to around 60 to keep the temp above 55 in the whole house so my oil burner doesn't need to provide any heat.