Updating the Controls in the Harman Pellet Pro II.

[Shakenbake]

I would say maybe 3hrs total it took me. I worked on it maybe an hour a day over 3 days until I fired it up. Not hard to do at all.

 

[Dlaj76]

I have a pellet pro ll that both of the boards fried. Does the p38 upgrade kit give you what you need for both boards or does it eliminate one of them? Thanks.

Old Blue is back alive! Control board upgrade seems like a success! I went with the p38 upgrade kit since it uses the same board as p61 now and It was one purchase with everything I needed.
View attachment 300469View attachment 300470

I have a harman pellet pro ll 55,000 btu. Both of the board got fried. Does the p38 upgrade kit give you what you need to replace both of the boards or does it eliminate one of them? Thanks.

 

[Finner]

I replaced original Pellet Pro II boards in Dec. 2022. I used P61A board set to manual .New wiring harness , black wire exaust gas temp probe and room air sensor. I chose the automatic board as I have a P61 A and thought it made sense to have common parts. Made a tin bracket to mount nicely, small cutout in bottom of new new board for feed control knob shaft. Has been a working well since than. Only thing I question still is the extra steel plate set on top of burn pot cover. It may push flames to far towards glass.

 

[Don2222]

Hi W-Up
It took 3-4 hours and some test time. Also got the parts before hand.
It took a P61 circuit board, circuit board face plate and p61 wire harness plus a red ESP probe and some cutting and drilling.

 

[sbparks]

Hello,

Looking for some help if possible. I've been running a Harman Invincible in my home since 1995. The stove has been great, but not burning well the last few years. I am always careful to properly clean before each heating season. The stove was not getting very warm, and turning up the feed rate always led to un burnt pellets in the ash can.

I recently updated the Invincible using the parts as described in this post. New control board, wiring harness, ESP and distribution fan. Don (Don2222) helped me through the entire process - Much thanks to Don!

I'm not certain how to properly identify the new control board that I used... I have it set to the P61 Manual Ignition setting. I used the red ESP probe and I mounted it close to where the original probe was mounted. I needed to drill and tap a new hole to mount the new ESP.

The stove burns better than I ever remember... nice even ash and no partially burnt pellets being pushed over the edge of the burn pot. I am very happy with that.

One thing that could be better... My distribution fan (new) doesn't come on unless I have the burn setting (I run in Stove Temp mode, not Room Temp mode) at about 4.5. The distribution fan will come on for short periods at setting 3, and not at all at setting 2 or less. I know the fan operates as it does come on (as described above) and when I set the Feed Rate dial to Test Mode. I have a manual feed wheel (old Invincible) set to 6 turns open.

My stove is quite warm and I would benefit if the fan were on pushing that heat into the room / house.

Any suggestions for getting the fan to operate more frequently, or even constantly? I am used to the distribution fan running constantly.

Thanks for any help on this matter! Let me know if I missed any details that would be useful.

Scott

 

[Washed-Up]

Are your dip switches set correctly on the board?

 

[ARC]

My distribution fan (new) doesn't come on unless I have the burn setting (I run in Stove Temp mode, not Room Temp mode) at about 4.5.

Isn't that how its suppose to run in Stove Temp on the P61?

The Harman P61's room fan operation is controlled by the stove's control knob in "room temperature" mode, which senses the room's heat and engages the fan when the stove is warm enough. In "constant burn" mode, the fan speed is manually adjusted with the knob, but in manual "stove temp" mode, the fan comes on when the feed rate is set above a four and turns off at or below a four.

In room temperature mode

• The room fan is controlled by the room temperature sensor.
• The fan will automatically turn on when the stove reaches a certain temperature to distribute heat into the room.
• The fan will automatically shut off when the stove's temperature drops below a set point, which is determined by the control board's programming.

In manual "stove temp" (or "constant burn") mode

• The control knob has a setting that manually controls the fan speed, from low to high.
• If the stove is set to manual and the knob is set to a four or lower, the room fan will shut off.
• If the knob is set to a setting higher than a four, the room fan will come on.

 

[Whitenuckler]

Hello,

Looking for some help if possible. I've been running a Harman Invincible in my home since 1995. The stove has been great, but not burning well the last few years. I am always careful to properly clean before each heating season. The stove was not getting very warm, and turning up the feed rate always led to un burnt pellets in the ash can.

I recently updated the Invincible using the parts as described in this post. New control board, wiring harness, ESP and distribution fan. Don (Don2222) helped me through the entire process - Much thanks to Don!

I'm not certain how to properly identify the new control board that I used... I have it set to the P61 Manual Ignition setting. I used the red ESP probe and I mounted it close to where the original probe was mounted. I needed to drill and tap a new hole to mount the new ESP.

The stove burns better than I ever remember... nice even ash and no partially burnt pellets being pushed over the edge of the burn pot. I am very happy with that.

One thing that could be better... My distribution fan (new) doesn't come on unless I have the burn setting (I run in Stove Temp mode, not Room Temp mode) at about 4.5. The distribution fan will come on for short periods at setting 3, and not at all at setting 2 or less. I know the fan operates as it does come on (as described above) and when I set the Feed Rate dial to Test Mode. I have a manual feed wheel (old Invincible) set to 6 turns open.

My stove is quite warm and I would benefit if the fan were on pushing that heat into the room / house.

Any suggestions for getting the fan to operate more frequently, or even constantly? I am used to the distribution fan running constantly.

Thanks for any help on this matter! Let me know if I missed any details that would be useful.

Scott

Can that run in Stove Mode, Igniter switch in "ON" or enabled? That should get the blower running.

 

[sbparks]

Thanks for the replies.

I double checked the dip switches. Correctly set for the P61 Manual Ignition setting.

ARC asked "Isn't that how it is supposed to run"... Well, yes it is, but my stove is nice and hot, but I need to get the heat convected into the room, Right? This will be fine for a very cold day, but in these fall days, I'd like to run the stove at a lower temp, but still have the fan operating. Just my take on it.

I can try running the stove with the Ignitor switch in the on position. I've always had it set to off at this point.

Again, thanks for the replies.

Scott

 

[Whitenuckler]

Thanks for the replies.

I double checked the dip switches. Correctly set for the P61 Manual Ignition setting.

ARC asked "Isn't that how it is supposed to run"... Well, yes it is, but my stove is nice and hot, but I need to get the heat convected into the room, Right? This will be fine for a very cold day, but in these fall days, I'd like to run the stove at a lower temp, but still have the fan operating. Just my take on it.

I can try running the stove with the Ignitor switch in the on position. I've always had it set to off at this point.

Again, thanks for the replies.

Scott

Thread 'How Your Harman Works -what your manual doesn't tell you..'

Sep 30, 2012

Thanks Mod for correcting the title!

Now, let's have some fun and stay warm!

How your stove works - The facts are pretty straightforward, but how you get people to properly interpret the facts is the hard part. It's your toy, run it the way you want as long as you understand what's going on behind the scenes! Everything noted below is based on me seeing what the stove is doing via the Harman diagnostic tool during the various operation methods. I get to see feed rates, max feed rates, current ESP temps, ESP set temps, room sensor temperatures, room sensor target...

• lbcynya
• Replies: 152
• Forum: The Pellet Mill - Pellet and Multifuel Stoves

• 

Let us know how you make out. I ran in stove mode a long time when I first got my stove. I actually kept the switch off on purpose, as I wanted to see how little pellets I could burn. You lose some efficiency not running the blower, but less noise. Now I am running in room mode, igniter off which also allows the blower to shut off. It does that as it knows the room is up to temperature, and it wants to cut the heat output (but not shut off)

 

[sbparks]

As per Whitenickler, I flipped the little switch to Auto... Sure enough, distribution fan comes on. That's what I wanted!

Thanks, guys, for the suggestions!

Scott

 

[sbparks]

Thanks also for posting the article about how the stoves really work. That was enlightening.

Another question please... When it comes time, what do I do to initiate a Shutdown sequence? My old control panel had a shutdown button. This one doesn't. I'll have to close my manual feed rate wheel, but anything else?

Scott

 

[Washed-Up]

I would just leave the wheel as is, turn the temps down and flip the igniter to manual…or let it run out of pellets would be the easiest

 

[Whitenuckler]

Thanks also for posting the article about how the stoves really work. That was enlightening.

Another question please... When it comes time, what do I do to initiate a Shutdown sequence? My old control panel had a shutdown button. This one doesn't. I'll have to close my manual feed rate wheel, but anything else?

Scott

The normal way is to turn the dial to midway between Stove and Room mode.