Been Running About 5 Hrs Now

ShawnTRD · Post by **ShawnTRD** » Wed. Oct. 15, 2014 7:56 pm

On timer (4 pin ever 15 min) only took about 3 hours to go from 155ish to 140.

On high fire for about 10 minutes

Once it reached about 155. But high aquastat is set for 180. Why did it shut off?

lsayre · Post by **lsayre** » Wed. Oct. 15, 2014 8:05 pm

Lookin good there ShawnTRD!

ShawnTRD · Post by **ShawnTRD** » Wed. Oct. 15, 2014 8:12 pm

Question about the triple aquastat. If I have the "Low" setting at 140, and the "High" setting at 160. Shouldn't the feeder kick in at 140 and stay running to 160? And what the Diff for?

lsayre · Post by **lsayre** » Wed. Oct. 15, 2014 8:17 pm

ShawnTRD wrote:Question about the triple aquastat. If I have the "Low" setting at 140, and the "High" setting at 160. Shouldn't the feeder kick in at 140 and stay running to 160? And what the Diff for?

Coal Gun's don't use triple aquastats, so I can't help you there. Someone more familiar with them should be along soon to assist you. if not, my advice would be to try sending Rob a PM.

McGiever · Post by **McGiever** » Wed. Oct. 15, 2014 8:18 pm

ShawnTRD wrote:Question about the triple aquastat. If I have the "Low" setting at 140, and the "High" setting at 160. Shouldn't the feeder kick in at 140 and stay running to 160? And what the Diff for?

Which model aquastat do you have?

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Post by **franco b** » Wed. Oct. 15, 2014 8:21 pm

ShawnTRD wrote:Question about the triple aquastat. If I have the "Low" setting at 140, and the "High" setting at 160. Shouldn't the feeder kick in at 140 and stay running to 160? And what the Diff for?

My understanding is that the unit will run at the low setting and then at the high setting when the thermostat calls for heat. The differential is to shut off the circulator when the boiler temp falls how many degrees it is set for below the high limit.

lzaharis · Post by **lzaharis** » Wed. Oct. 15, 2014 8:28 pm

I have the strap on pipe aqaustats Shawn.

But it comes down to the satisfaction of the thermostat and the aquastats from what I
remember and if the pumps are set at a slow speed like I have mine set
(3 speed B+G pumps set on the number one setting) you have more hot water
staying in the boiler longer.

I am unsure if you have too much unburned coal in the ash tube but opening
the air inlet on the secondary fan would help with that.

Are you leaving your oil tank by the stoker?

ShawnTRD · Post by **ShawnTRD** » Wed. Oct. 15, 2014 8:38 pm

franco b wrote:
ShawnTRD wrote:Question about the triple aquastat. If I have the "Low" setting at 140, and the "High" setting at 160. Shouldn't the feeder kick in at 140 and stay running to 160? And what the Diff for?
My understanding is that the unit will run at the low setting and then at the high setting when the thermostat calls for heat. The differential is to shut off the circulator when the boiler temp falls how many degrees it is set for below the high limit.

Ok so 180 is when the thermostat is on, and DIFF 10,15 or 20 is for turn on at 170, 165 or 160. Does the same go for the low side?

ShawnTRD · Post by **ShawnTRD** » Wed. Oct. 15, 2014 8:42 pm

lzaharis wrote:Are you leaving your oil tank by the stoker?

It's getting moved this weekend.

Post by **Rob R.** » Wed. Oct. 15, 2014 8:44 pm

ShawnTRD wrote:Question about the triple aquastat. If I have the "Low" setting at 140, and the "High" setting at 160. Shouldn't the feeder kick in at 140 and stay running to 160? And what the Diff for?

No. It will not run up to the high limit unless the TT terminals are joined or if there is 120v at the ZR terminal.

Low limit differential is normally set at 10.

ShawnTRD · Post by **ShawnTRD** » Wed. Oct. 15, 2014 8:45 pm

Post by **franco b** » Wed. Oct. 15, 2014 9:09 pm

ShawnTRD wrote:Ok so 180 is when the thermostat is on, and DIFF 10,15 or 20 is for turn on at 170, 165 or 160. Does the same go for the low side?

Yes it should go to 180 when thermostat calls and is connected to the TT terminals. The differential is to turn off the circulator when the temperature falls below whatever the differential is set at. If hi limit is 180 and differential is 15 then the circulator should turn off at 165. It gives the boiler time to recover heat and prevents having domestic water run out of heat. Should not effect low limit. This is my understanding

I much prefer the set up of many years ago when three separate aquastats were used; low or running aquastat, High limit, Reverse. The aquastats were activated by a helical bi-metal coil that turned a mercury switch. Reliable and lasting and safer. The high limit was strictly an extra safety, ordinary operation was only with the low limit and generally the system was sized for 160 to 180 degree water. With the new system there is only one aquastat guarding against runaway water temperature when heat is called for and there is only one sensor. A micro switch as opposed to a mercury switch.

Post by **franco b** » Wed. Oct. 15, 2014 9:15 pm

Rob says that the differential works on the low limit and I would prefer his word on this.

McGiever · Post by **McGiever** » Wed. Oct. 15, 2014 9:30 pm

franco b wrote:Rob says that the differential works on the low limit and I would prefer his word on this.

You're both correct.

ShawnTRD · Post by **ShawnTRD** » Wed. Oct. 15, 2014 9:33 pm

Ok so that makes sense. So in summer if your running just DHW and leave the High limit at 180 it doesn't matter. Because you never turn on the thermostat. So it can stay at 140 via the Low limit for DHW. But in the winter you change the Low to 160 so it's not that far from 180.

So the Diff works on both High and Low?