boiler wiring

I've recently had a new boiler installed, but it's not wired up.

My old boiler didn't have an independent power supply. It had a single

2-core & earth cable running to the board. The board connects the mains, the pump, the timer & the 3-way valve.

My newly installed boiler (Ravenheat) has three double blocks - the first block is already connected to a mains cable. The middle block has a loop between the two terminals. The third block is marked for direct connection to the pump. The instructions say that nothing must interrupt the supply to the pump, also that the middle loop must be removed for "timers/programmers".

Can I just remove the loop and connect the existing cable to the third set of terminals? Must the boiler mains cable be connected to an independent power supply?

TIA for any useful hints.

Andrew L.

Reply to
Andrew L.
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You will need to run one or more extra cables between the boiler and the rest of the heating.

I could make an educated guess about the rest of the system you probably have a HW cylinder and a programmer/timer and thermostats. It is the _supply_ to these that will also supply the boiler. There is no need supply the boiler with an additional power supply but the supply to the boiler must not be switched by timers or thermostats.

Without knowing the details about the rest of the system I can't say exactly how the loop should be replaced. On a typical S-plan system with 2 Zone valves the grey/orange wires will be connected in parallel in place of the loop.

The pump connects to the pump connection in the boiler.

HTH

Reply to
Ed Sirett

In article , Andrew L. writes

I take it you have googled for the boiler and not managed to find the installation instructions on line?

Reply to
John

2-core & earth cable running to the board. The board connects the mains, the pump, the timer & the 3-way valve.

block is already connected to a mains cable. The middle block has a loop between the two terminals. The third block is marked for direct connection to the pump. The instructions say that nothing must interrupt the supply to the pump, also that the middle loop must be removed > >for "timers/programmers".

of terminals? Must the boiler mains cable be > >> connected to an independent power supply?

the boiler with an additional power supply but the

Thanks for this. TBH my sytem looks more like Honeywell Y than Honeywell S. (3way valve instead of zone valves).

The black wire connects to pump (blue) / 3way valve (blue) / clock (black). The red wire connects to pump (brown) / 3way valve (orange) / cylinder stat (black). It occurs to me that I can run the original cable to the middle block on the boiler, and install a new cable for direct connection between pump and boiler. Then connect the mains cable to mains - obviously with the correct fused unit.

Does this make sense or suicide?

Thanks for your help so far.

Reply to
Andrew L.

2-core & earth cable running to the board. The board connects the mains, the pump, the timer & the 3-way valve.

block is already connected to a mains cable. The middle block has a loop between the two terminals. The third block is marked for direct connection to the pump. The instructions say that nothing must

for "timers/programmers".

terminals? Must the boiler mains cable be connected to an independent power supply?

Reply to
Andrew L.

Looks like you have a pump overrun boiler. First connection is pemanant live from the wiring centre, this is to allow the pump to run on for a short time after boiler shutdown.The link/loop is connected to timer/thermostat, etc which will cause the boiler to fire when heat is called for (don,t connect live & neutral accross these). Third connection to go to pump only so that it can run on when required.

Reply to
Heliotrope Smith

2-core & earth cable running to the board. The board connects the mains, the pump, the timer & the 3-way valve.

block is already connected to a mains cable. The middle block has a loop between the two terminals. The third block is marked for direct connection to the pump. The instructions say that nothing must

for "timers/programmers".

of terminals? Must the boiler mains cable be connected to an independent power supply?

Which is all you really need to know to correctly connect the system.

Reply to
Ed Sirett

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