Switching for Biomass

[Roddie82]

Hi I am currently working on a Biomass installation on a farm which will be servicing two houses and a fan blower. I need to be able to run the main pump in the boiler room when demand is called for from any of these 3 systems. 1 house is over 150m away with the other 90m in the opposite direction. What I am trying to consider is how this can be done without back feeding on the lives, I am new to heating installations of this size and any help would be appreciated.

Thanks

Rodders82

 

[Leesparkykent]

Through a relay/s.

 

[Engineer54]

There are several ways of doing this. First and foremost it's best to draw out the overall control circuits and check that the individual controls operate the appropriate plant associated with that building without affecting the other buildings controls.... The use of relays is just one method of achieving this....

 

[Roddie82]

There are several ways of doing this. First and foremost it's best to draw out the overall control circuits and check that the individual controls operate the appropriate plant associated with that building without affecting the other buildings controls.... The use of relays is just one method of achieving this....

The controls of the other buildings should not be affected, when the buildings call for heat this should operate the pump.

 

[Engineer54]

Eh, yes, that's what i think said!!

 

[Knobhead]

Doddle of a job with relays.

Where is main power for the boiler fed from? What is the loading?

 

[Roddie82]

Doddle of a job with relays.

Where is main power for the boiler fed from? What is the loading?

fed from 16a type C MCB

 

[Knobhead]

From where

 

[Toby Kuhnert]

As everyone else has said..relays. I've done a few biomass installs now, biggest one to date is one boiler to supply 6 houses/plots. We install 1 relay for each plot next to the control panel in the plant room.

 

[Roddie82]

From where

The CU in the plant room right next to the boiler.

 

[jackhammerJIM]

What make of boiler is it ?
Is there a buffer tank in the plant room and is this pump on the primary or secondary side of the buffer tank ?

 

[Roddie82]

So I can supply all programmers/motorised valves from the property CU's and run the switch wires back through relays at the plant room?

 

[Knobhead]

Basically yes. If one house is calling for heat it signals the boiler to start up. You may have to be careful if the boiler requires a run on time.

 

[jackhammerJIM]

Basically yes. If one house is calling for heat it signals the boiler to start up. You may have to be careful if the boiler requires a run on time.

Depends on the setup .

Large systems will have a buffer tank which the houses will draw from . The boiler will only fire to keep this buffer tank topped up .

 

[ALD]

Most likely like jack described a district system. Usual setup is biomass boiler feeding buffer. From buffer to district pump.One district pump I should imagine with only feeding 2 houses. Pending on manufacture of boiler, all these can be wired back to boiler and controlled via biomass boiler controls. Treat the heat exchangers in the houses as conventional boilers and usually wired as S plans supplyed from local supply.

 

[mache]

Most likely like jack described a district system. Usual setup is biomass boiler feeding buffer. From buffer to district pump.One district pump I should imagine with only feeding 2 houses. Pending on manufacture of boiler, all these can be wired back to boiler and controlled via biomass boiler controls. Treat the heat exchangers in the houses as conventional boilers and usually wired as S plans supplyed from local supply.

I would expect this system also boiler feeding buffer tank in feeding to house heat exchangers 24/7 regardless of property demand. Each property then drawing as required from heat exchangers on demand from house heating controls.

 

[Roddie82]

The pump is being run independently so that there is minimal disruption to the controls at each plot as it is existing houses with heating systems already installed. Forget about the boiler and it's set up completely. All I want to do is have 4 independent circuits that are able to switch a two port valve at each plot which then brings on a pump when called upon from any plots.

 

[Leesparkykent]

Just an idea, could you fit a precision flow meter with an output signal or flow switch so when the pumps inside each property kicks in when calling for heat the flow switch/meter detects the flow and the signal activates the main pump in the boiler room? Obviously there would be some calculations involved for sufficient flow to trigger the flow switch/meter etc.