Tjernlund AD-1 Draft inducer positioning question

Tjernlund AD-1 Draft inducer positioning question

PostBy: lsayre On: Sat May 18, 2013 9:29 pm

I run my boiler year-round, and I often see very low draft in the summer. I have a very short flue pipe arrangement, and about the only place where I might have room for a Tjernlund AD-1 is on the far side of my 6" diameter baro tee (the side opposite the baro damper). Is it possible to position the Tjernlund AD-1 at that location, or should I consider a far more expensive chimney top inducer?
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Anthracite Pea
Other Heating: Resistance Boiler (if I ever get it fixed)

Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: Dennis On: Sun May 19, 2013 7:38 am

I have a short flue pipe,about 4'.It's located about 10" off the boiler and 2' before the baro. You MUST turn down the speed of the inducer first,if not you will blow exhaust out thru your baro.
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: lsayre On: Sun May 19, 2013 7:40 am

Dennis wrote:I have a short flue pipe,about 4'.It's located about 10" off the boiler and 2' before the baro. You MUST turn down the speed of the inducer first,if not you will blow exhaust out thru your baro.


Sounds like I will not be able to go this route. Problem is that the chimney top draft inducers cost about 10 fold more.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Anthracite Pea
Other Heating: Resistance Boiler (if I ever get it fixed)


Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: Dennis On: Sun May 19, 2013 7:58 am

lsayre wrote:
Dennis wrote:I have a short flue pipe,about 4'.It's located about 10" off the boiler and 2' before the baro. You MUST turn down the speed of the inducer first,if not you will blow exhaust out thru your baro.


Sounds like I will not be able to go this route. Problem is that the chimney top draft inducers cost about 10 fold more.


I think Tjerlund makes another smaller inducer,I believe member "wood & coal" has one.
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: Rob R. On: Sun May 19, 2013 8:00 am

Draft inducers are not without drawbacks. When run at full speed the inducer may max out your baro...throttle it down with a rheostat, and the inducer motor may run too hot.

I think a repeat cycle timer is a better solution...run the AHS blower once or twice per hour, maintain a stronger draft, and give the unit a chance to ash once in a while.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: Lightning On: Sun May 19, 2013 9:57 am

Dennis, your draft inducer is before the baro? I would be afraid it would push exhaust out the baro even on a low setting.
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: lsayre On: Sun May 19, 2013 9:59 am

Lightning wrote:Dennis, your draft inducer is before the baro? I would be afraid it would push exhaust out the baro even on a low setting.


Where are they supposed to go with respect to the baro damper?
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Anthracite Pea
Other Heating: Resistance Boiler (if I ever get it fixed)

Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: Lightning On: Sun May 19, 2013 10:25 am

It makes best sense to me that it at last in position since it could create positive pressure in the pipe until draft is reestablished. My configuration is below.

Appliance→MPD→baro→draft inducer→chimney

I have a hand fed appliance. I use the inducer rarely, only on warm days in the spring and fall when the draft fails. I've since learned how to manipulate my secondary air adjustment to maintain my draft without the inducer.

I also use the inducer during fire starting or while I'm cleaning since it will pull ash dust away from me. :D
Lightning
 
Hand Fed Coal Furnace: Clayton 1537G
Coal Size/Type: Nut Size / White Ash

Re: Tjernlund AD-1 Draft inducer positioning question

PostBy: I'm On Fire On: Mon May 27, 2013 2:19 pm

Rob R. wrote:Draft inducers are not without drawbacks. When run at full speed the inducer may max out your baro...throttle it down with a rheostat, and the inducer motor may run too hot.

I think a repeat cycle timer is a better solution...run the AHS blower once or twice per hour, maintain a stronger draft, and give the unit a chance to ash once in a while.


That's why I changed my switch out on the AD-1 draft inducer.
KBWC-16K (H9001) Wall Mount AC Fan Motor Control
http://www.amazon.com/KBWC-16K-H9001-Mount-Motor-Control/dp/B007YA2YLC/ref=sr_1_1?s=industrial&ie=UTF8&qid=1369678557&sr=1-1&keywords=KBWC-16K+%28H9001%29+Wall+Mount+AC+Fan+Motor+Control

That's the switch I use, it doesn't allow the motor to stall. You can run it as low as you'd like. I have mine set at .04" WC and with the old switch the motor would stall that low, it's barely turning. But with the new switch it has no problems.

I also have my AD-1 about 8" from the back of the stove. I screwed a heat shield to it to protect the motor though. Although, I'm not running a baro.
I'm On Fire
 
Hand Fed Coal Stove: DS Machines DS-1600 Hot Air Circulator