Keep the circulating pump running for 2-3 mins after boiler shuts off

Dtp1979 · 14-10-2018 12:42PM

Bleed but should face you and not the sky

John.G · 14-10-2018 06:06PM

Blowheads wrote: »

Ok, the frost stat was set to -4, I've set that to +4 now.

I turned up the frost stat and pump and boiler ran, water through the bypass as all other valves were off. Water got hot v quickly and boiler shut off but pump kept running. I don't think this was directly related to recent events because there was no frost

I also checked the hole for the stat/high limit, it seemed clean enough

Since I started this thread it hasn't tripped once

Back to the pump orientation, which way should the air nut be facing? Out towards me or up to the sky?

One other thing I meant to mention, you say above "Since I started this thread it hasn't tripped once", did this coincide with not running the solid fuel?, I was just thinking that if the solid fuel was in service at the same time and its circ pump runs at a higher head then there would be a much reduced flow through the oil boiler and even though we now know that the by pass is working it might result occasionally in tripping out the oil boiler hi limit stat. On the other hand if the oil boiler was tripping the hi limit stat when running alone then forget it.

Edit: yes, forget it, you already answered that question in post no14 thanks.

Dtp1979 · 14-10-2018 08:18PM

Solid fuel pump comes on, draws air pocket in through the AAV on the oil boiler. Oil boiler fires then trips stats. Not sure if this was mentioned

Blowheads · 14-10-2018 09:46PM

Dtp1979 wrote: »

Solid fuel pump comes on, draws air pocket in through the AAV on the oil boiler. Oil boiler fires then trips stats. Not sure if this was mentioned

Sounds like a potential issue. We already see there is a leak of some sort on the flow from the boiler. Would you recommend like the others in replacing all that, a single NRV placed horizontally, then the AAV then down and in to the house

I do get some air in the system inside from time to time, not a lot but I do bleed 2 rads an odd time

John.G · 14-10-2018 10:44PM

Blowheads wrote: »

Sounds like a potential issue. We already see there is a leak of some sort on the flow from the boiler. Would you recommend like the others in replacing all that, a single NRV placed horizontally, then the AAV then down and in to the house

I do get some air in the system inside from time to time, not a lot but I do bleed 2 rads an odd time

You probably mean that anyhow but be sure to renew/remake any couplers or fittings on the suction side of the pump as that is a very likely point for ingress of air.

Blowheads · 17-10-2018 04:22PM

Afternoon all,
Latest update,
1. All couplings and fittings removed and replaced
2. There was only 1 NRV installed, rest were reducing joints. New NRV installed but due to space it's vertical
3. No AAV was installed, this I think was the problem, new one installed
4. New pump installed Yilo Pici
5. New fuel lines installed
6. New dual stat/high limit

See picture of new set up

I guess time will tell now what happens

I rotated the image for easier viewing. Wearb

John.G · 17-10-2018 07:32PM

Blowheads wrote: »

Afternoon all,
Latest update,
1. All couplings and fittings removed and replaced
2. There was only 1 NRV installed, rest were reducing joints. New NRV installed but due to space it's vertical
3. No AAV was installed, this I think was the problem, new one installed
4. New pump installed Yilo Pici
5. New fuel lines installed
6. New dual stat/high limit

See picture of new set up

I guess time will tell now what happens

I rotated the image for easier viewing. Wearb

Is that a swing check NR valve or a spring assisted swing check or maybe it is a poppet valve, if the former then it will just hang down and not close as intended when the solid fuel stove is operating on its own, you can also fit the spring type poppet valve like the original as these operate in the vertical.
The PRV should really be located on the boiler shell itself, there is usually a 1/2 ins plugged port on top of the boiler itself.

What model of Wilo pump have you installed, is it the Wilo Pico Yonis 1-6 and what control option have you chosen, is it constant curve or proportional differential head?

The fitting of a AAV is a very good decision and hopefully now you can now enjoy a trip free winter.

Blowheads · 18-10-2018 12:29PM

John.G wrote: »

Is that a swing check NR valve or a spring assisted swing check or maybe it is a poppet valve, if the former then it will just hang down and not close as intended when the solid fuel stove is operating on its own, you can also fit the spring type poppet valve like the original as these operate in the vertical.
The PRV should really be located on the boiler shell itself, there is usually a 1/2 ins plugged port on top of the boiler itself.

What model of Wilo pump have you installed, is it the Wilo Pico Yonis 1-6 and what control option have you chosen, is it constant curve or proportional differential head?

The fitting of a AAV is a very good decision and hopefully now you can now enjoy a trip free winter.

It's a spring NRV because no space for a vertical swing one

I'll also see if/where on boiler to there is a connection for a AAV when boiler gets serviced

Yonis 1-6, but absolutely no idea for the settings, plumber did that

John.G · 18-10-2018 01:02PM

Blowheads wrote: »

It's a spring NRV because no space for a vertical swing one

I'll also see if/where on boiler to there is a connection for a AAV when boiler gets serviced

Yonis 1-6, but absolutely no idea for the settings, plumber did that

Its the PRV that you may consider re locating to the boiler top, the AAV location is OK, IMO.

Purely from a interest point of view, sometime when you are in the vicinity of the boiler house and the heating is on, you might have a look at the power consumption of the circ pump, I think it's displayed on those Wilo pumps.

Blowheads · 11-11-2018 06:44PM

Job done 3 weeks now, no issues since. Fingers crossed it stays that way

Keep the circulating pump running for 2-3 mins after boiler shuts off

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