8124 Question

 
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Rick 386
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Post by Rick 386 » Sat. Oct. 29, 2016 9:33 pm

Finishing up my reworking of the AA 260.

Ripped out the old birds nest of wires and pipes and replacing with all new controls and pumps. Pics will follow soon.

I have a Honeywell 8124a controlling the boiler and feeding an R845a relay to each zone and pump.

Do I need to hook up the zr and zc of the 8124a to each R845a relay ??

Wiring is not my strong suit.

Rick


 
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Scottscoaled
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Post by Scottscoaled » Sat. Oct. 29, 2016 9:44 pm

ZR and ZC. Search L8124A. There is a real good, easy to understand wiring diagram on the Honeywell PDF website.

 
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Post by Rob R. » Sun. Oct. 30, 2016 4:15 am

ZR/ZC is used to power the relays so that the 8124 can shut the circulators off if the water temperature drops below the low limit setting. This is to prevent you from getting a cold shower if you are using the tankless coil.

I am guessing the 260 just loafs along and doesn't have any problems maintaining temperature. If that is the case, you don't need to hook up the zone relays that way.

 
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Rick 386
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Post by Rick 386 » Sun. Oct. 30, 2016 7:06 pm

So I'm at a loss here. I do have the L8124a instructions. I thought I followed them correctly but still no circulator when I jump the TT wires.

Here's what I got:

L8124a is as follows

Hot line to L1 neutral to L2
B1 and B2 to AA 260 fan and auger drive motor. (I do have a separate gear motor for my auger and asher. )
And wires coming off ZR and ZC

R845a as follows:

Terminal 1 has neutral feed
Terminal 2 has ZC from 8124a and circulator motor neutral lead
Terminal 3 has nothing
Terminal 4 has ZR from 8124a
Terminal 5 has hot feed
Terminal 6 has circulator motor hot lead
TT wires from each TT are connected to each R845a corresponding to each circulator

Rick

 
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Scottscoaled
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Post by Scottscoaled » Sun. Oct. 30, 2016 8:06 pm

Hold on fella! Here ya go.
Neutral from L2 goes to all the 2's on the 845's

Hot from L1 goes to all the 3's and 6's on the 845's

ZC wire goes to all the 1's on the 845's

ZR wire goes to all the 4"s on the 845's


The circ pumps on all the zones terminate on the 2 (Neutral), and the 6 (hot)

4 wires from the L8124a to the first 845. 4 wires between each 845.

 
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Post by Rob R. » Sun. Oct. 30, 2016 8:25 pm

Scott, he has an oil boiler in this system as well. how will the zone circulators work when running the oil boiler if the relays are powered via the 8124 on the coal boiler? Not saying it can't work, but it doesn't make sense to me.

 
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Scottscoaled
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Post by Scottscoaled » Sun. Oct. 30, 2016 8:53 pm

I don't know about the oil boiler but if he has ZC on the neutral of the circ pump it won't work. ZC is a switched feed from the L8124a that is enabled when the boiler is up to temp. Without a neutral, the circ pump won't run. he has the wires switched on 1 and 2. He also needs to jumper 3 and 5.
Last edited by Scottscoaled on Sun. Oct. 30, 2016 8:59 pm, edited 1 time in total.


 
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Rick 386
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Post by Rick 386 » Sun. Oct. 30, 2016 8:59 pm

Scott and Rob. I'm setting this up as a stand alone coal boiler right now. Not even connected to the oil.

But Scott are you sure you about the circulator pump wires. Shouldn't the line hot go to terminal 5 and the circulator pump hot leg go to terminal 6 ????

Rick

 
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Scottscoaled
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Post by Scottscoaled » Sun. Oct. 30, 2016 9:05 pm

5 and 3 are the Hot. 6 and 4 are the switched legs of the contacts. 6 goes to your circ pump and 4 goes to the ZR terminal. By your initial setup. The wires on 1 and 2 were backwards. The pump neutral needs to be on 2. All neutrals on 2. The 1 is the power that feeds the 845. It is fed from the ZC terminal.

 
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Rick 386
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Joined: Mon. Jan. 28, 2008 4:26 pm
Location: Royersford, Pa
Stoker Coal Boiler: AA 260 heating both sides of twin farmhouse
Hot Air Coal Stoker Stove: LL Hyfire II w/ coaltrol in garage
Coal Size/Type: Pea in AA 260, Rice in LL Hyfire II
Other Heating: Gas fired infared at work
Contact:

Post by Rick 386 » Sun. Oct. 30, 2016 9:17 pm

Gotcha. On your reply you initially said hot on 3 and 6. And pump also on 6. Got it now.

Thanks so much.

Beers are on me......

Thanks again. My head hurts from dealing with this all day.

Rick

 
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Scottscoaled
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Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup

Post by Scottscoaled » Sun. Oct. 30, 2016 9:25 pm

Oh! My bad. Sorry for the mix up. Gave you a little added drama. Is she up and running? Pics?

 
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Rick 386
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Posts: 2508
Joined: Mon. Jan. 28, 2008 4:26 pm
Location: Royersford, Pa
Stoker Coal Boiler: AA 260 heating both sides of twin farmhouse
Hot Air Coal Stoker Stove: LL Hyfire II w/ coaltrol in garage
Coal Size/Type: Pea in AA 260, Rice in LL Hyfire II
Other Heating: Gas fired infared at work
Contact:

Post by Rick 386 » Sun. Oct. 30, 2016 9:59 pm

Yeah she's up and running. Will post pics soon on the repiping and rewiring.

Wifey knew immediately that it was running after I joined TT wires and got the circulator pump running. She's sweating and happy. New grundfoss pumps really push the water through the pipes.

And the new air separator is working well. I heard the compression tank gurgling which means the air is getting in there........

Beer time.

Rick

 
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Rick 386
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Posts: 2508
Joined: Mon. Jan. 28, 2008 4:26 pm
Location: Royersford, Pa
Stoker Coal Boiler: AA 260 heating both sides of twin farmhouse
Hot Air Coal Stoker Stove: LL Hyfire II w/ coaltrol in garage
Coal Size/Type: Pea in AA 260, Rice in LL Hyfire II
Other Heating: Gas fired infared at work
Contact:

Post by Rick 386 » Wed. Nov. 02, 2016 10:17 am

New issue has popped up.

It seems like the thermostats are not working/reading like they did while connected to the oil burner.

On our zone, there might be a 5* difference in where we need to set the thermostat. Other zone may be closer to 10* difference.

Should I replace with digital thermostats ??? Maybe change out thermostat wiring ??

We didn't have the issue with this until I changed over the boiler wiring to this new setup.

Rick

 
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Post by Rob R. » Wed. Nov. 02, 2016 1:18 pm

Are they mercury thermostats with adjustable heat anticipators?

 
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Rick 386
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Joined: Mon. Jan. 28, 2008 4:26 pm
Location: Royersford, Pa
Stoker Coal Boiler: AA 260 heating both sides of twin farmhouse
Hot Air Coal Stoker Stove: LL Hyfire II w/ coaltrol in garage
Coal Size/Type: Pea in AA 260, Rice in LL Hyfire II
Other Heating: Gas fired infared at work
Contact:

Post by Rick 386 » Wed. Nov. 02, 2016 5:29 pm

Rob R. wrote:Are they mercury thermostats with adjustable heat anticipators?
Pretty sure they are Rob.

They are just your plain basic round thermostat.

Rick


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