Harman DVC 500 fan CFM

Harman DVC 500 fan CFM

PostBy: Nevercold On: Sun Oct 18, 2009 3:00 pm

This is my 4th season burning in the dvc 500.
It seems to me, the distribution blower had more force when it was new . I'll have to remove, clean, and lube to be sure it's up to par......BUT.......

The real question ....PER SPECS; the blower is 135 CFM
Other manufacturers of similar stokers have blowers in the 265 CFM range....DAMN NEAR DOUBLE THE CFM !!!

This fact makes me consider if I'm loosing the ability to get the most heat out of my stove, as compared to others with the larger CFM blowers.

Your thoughts, ideas, and experiences would be appreciated.........
Nevercold
 
Stove/Furnace Make: Harman
Stove/Furnace Model: DVC-500

Re: Harman DVC 500 fan CFM

PostBy: 009to090 On: Sun Oct 18, 2009 3:25 pm

It may need to be oiled. Can you tell if the Distribution motor was mounted upside-down? If it is it'll be hard to oil it. Try unmounting it and spin it 180 degrees, then remount it. That way, any oil you add will goto the shaft. That issue is discussed here.....
Harman DVC-500 Efficiency
009to090
 
Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice

Re: Harman DVC 500 fan CFM

PostBy: ablumny On: Sun Oct 18, 2009 5:09 pm

WOW! I see my motor is also mounted with the label on the bottom and the oil hole on the bottom. So the problem with that is that the oil hole is not on the top and oil could seep out? How hard is this to rotate? My stove is fired up, will I have to wait for a complete cool down? Anyone confirm with Harman that this is really a problem ?
ablumny
 
Hot Air Coal Stoker Stove: Harman dvc500
Coal Size/Type: Rice

Visit Lehigh Anthracite

Re: Harman DVC 500 fan CFM

PostBy: CoalBin On: Sun Oct 18, 2009 11:12 pm

If it’s upside down I would remove the motor, clean the squirrel cage, lubricate the motor & remount right side up. My motor came to a screeching halt last year (mid third season) first it slowed down, then it made progessivly nastier sounds – took it apart & re-lubed – its running as good as new again. All the oil leaked out of the felt reservoir while it was mounted upside down. Its up to you if you want to attempt contacting harmon about this :? My dealer just went on & on about not having some sort of yellow wty form on file - so I fixed it myself.

I'll be keeping an eye on the squirrel cage & clean it as necessary - my fan's fins were caked with dust/ash - so maybe thats where your reduced CFMs are ?

PS - I looked into a replacement with more CFMs - but could not spec one, either not the right size or too many amps.
CoalBin
 
Stove/Furnace Make: Harman
Stove/Furnace Model: DVC-500

Re: Harman DVC 500 fan CFM

PostBy: ablumny On: Mon Oct 19, 2009 7:04 am

CoalBin wrote:If it’s upside down I would remove the motor, clean the squirrel cage, lubricate the motor & remount right side up. My motor came to a screeching halt last year (mid third season) first it slowed down, then it made progessivly nastier sounds – took it apart & re-lubed – its running as good as new again. All the oil leaked out of the felt reservoir while it was mounted upside down. Its up to you if you want to attempt contacting harmon about this :? My dealer just went on & on about not having some sort of yellow wty form on file - so I fixed it myself.

I'll be keeping an eye on the squirrel cage & clean it as necessary - my fan's fins were caked with dust/ash - so maybe thats where your reduced CFMs are ?

PS - I looked into a replacement with more CFMs - but could not spec one, either not the right size or too many amps.


I'm also on Long Island, good chance we have the same dealer :) and if so I can see them getting tangled up in missing paperwork over customer service. I dropped an email into Harman but no matter, I'll take it out and rotate it during the week. What kind of oil did you use and how do you know when you've added enough? thx
ablumny
 
Hot Air Coal Stoker Stove: Harman dvc500
Coal Size/Type: Rice

Re: Harman DVC 500 fan CFM

PostBy: CoalBin On: Mon Oct 19, 2009 10:03 am

ablumny wrote:I'm also on Long Island, good chance we have the same dealer :) and if so I can see them getting tangled up in missing paperwork over customer service.


That’s the dealer with the R - a capital R - :? Went in circles with them about the FORM, bottom line is that they wanted me to drop it off in person before they would even acknowledge my existence – meanwhile they have me in their system and deliver my coal every year – go figure.

So – instead of dealing with them, I looked into a Harman replacement ($127) – turns out Grainger has the same complete fan for $70? – just before ordering a new one, I fixed the old one.

Who knows – they may even consider that motor to be “permanently lubricated” Dayton calls their lube system Permawick – but in my case over time, the oil leaked out & seized the bushings. The oil would not have leaked out if the oil holes were facing up.

If you lubricate the beast, you are looking to wet the felt in there – not saturate it to the point of dripping wet. I used regular motor oil – but the right thing to use is a non-detergent oil (won’t affect the bronze & leave deposits) Electric motor oil or 20W non detergent -
CoalBin
 
Stove/Furnace Make: Harman
Stove/Furnace Model: DVC-500

Re: Harman DVC 500 fan CFM

PostBy: ablumny On: Mon Oct 19, 2009 4:33 pm

Coal Bin: I know who your dealer is and they are my dealer for the stove but I dont buy coal from them. They are a tough bunch to deal with for sure. You have to have the right personality to work with them! A friend of mine burned thier coal only to find it produced more ash, burned faster thus ran out faster then the "other" popular Long Island source many use and thats Bethlahem Coal.

Anyway, I just hung up with Harman. Interesting response to the motor upside down question which was they've dont know which way its supposed to be mounted. I sent them pics from the forum of the motor mounted both ways and they can see the obvious difference but say they felt there is no way that oil would seep out of that hole when mounted upside down but did agree that the motor looked like it should be the other way. The felt pad is not supposed to be saturated so much that oil would seep out even when upside down. The also stated that while there is nothign in the manual about scheduled maintenence on this motor, it could be lubricated if necessary. Basically they were very nice, took time to review my data and call me back but didn't have a good conclusion. I'll turn it over regardless.
thx (give Ron @ Bethlehem a call !)
ablumny
 
Hot Air Coal Stoker Stove: Harman dvc500
Coal Size/Type: Rice

Re: Harman DVC 500 fan CFM

PostBy: wenchris On: Mon Oct 19, 2009 8:39 pm

Been dealing with Ron for years, real gentleman. Got from "R" only once, never again(John is a real piece of work). If you look at Rons truck it even says:"THE NICE GUYS" and that they are.... :)
Stay warm Jimmy
wenchris
 
Stove/Furnace Make: Harman
Stove/Furnace Model: Magnum stoker with water coil

Re: Harman DVC 500 fan CFM

PostBy: CoalBin On: Mon Oct 19, 2009 8:56 pm

Cool, I'm going to call Ron in the morning !

My coal is still producing lots of moisture ? sitting in the bin since last august - this last load definitely produced more ash & ash was rather red

Alblumny - did you ever solve that fines issue - I'm just wondering because I took a look at your photos & your coal sort of looks like your flakey fines problem. My coal is consistant - in all ways including moisture.
CoalBin
 
Stove/Furnace Make: Harman
Stove/Furnace Model: DVC-500

Re: Harman DVC 500 fan CFM

PostBy: ablumny On: Tue Oct 20, 2009 6:57 am

CoalBin wrote:Alblumny - did you ever solve that fines issue - I'm just wondering because I took a look at your photos & your coal sort of looks like your flakey fines problem. My coal is consistant - in all ways including moisture.


Ya know, I was thinking the coal was the problem but as I ran out of my initial load last season, I grabbed a 5 gal bucket of rice from a friend of mine who got it from the R dealer and although 5 gal wasn't enough to fill the fines tray, it seemed to produce a higher then expected level of fines as well. So when the season was over I dived into the pusher bar assembly as was suggested but there was no excess play no indication the pusher was moving to far back or forward so at this point i'll check the tray one a week during peak and chuck the contents back on the fire..... Im contemplated calling my dealer but I think I'd rather extract my own wisdom teeth :)

.....and Ron IS a great guy. do a search for Bethlehem Coal on the forum. He's been discussed many times...
ablumny
 
Hot Air Coal Stoker Stove: Harman dvc500
Coal Size/Type: Rice

Re: Harman DVC 500 fan CFM

PostBy: ablumny On: Tue Oct 20, 2009 7:00 am

CoalBin wrote:Cool, I'm going to call Ron in the morning !

My coal is still producing lots of moisture ? sitting in the bin since last august - this last load definitely produced more ash & ash was rather red


Moisture? Sure. Most dealers wash down their coal and Ron does as well. My Bin is vented and allows for draining. I get my delivery late summer, by the time I got to the stove the coal was moist enough not to puff up a cloud of dust when filling the hopper and gave me no trouble to burn.

Coal producing moisture? I never thought about that but I did vent my bin, maybe that took care of it? More ash and redder then expected.....thats what my friends that use coal from R dealer say. Must be their source.....
ablumny
 
Hot Air Coal Stoker Stove: Harman dvc500
Coal Size/Type: Rice

Visit Lehigh Anthracite