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.

On Sat, 06 Jan 2007 02:07:41 -0800, Andrew L. wrote:

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.


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



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards

Ed Sirett wrote:
On Sat, 06 Jan 2007 02:07:41 -0800, Andrew L. wrote:

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.


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

Ed Sirett - Property maintainer and registered gas fitter.

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.

In article .com,
Andrew L. writes
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.

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

--
John Alexander,

Remove NOSPAM if replying by e-mail

John wrote:

In article .com,
Andrew L. writes
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.

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

--
John Alexander,

The boiler instructions are available as a .pdf online, but sadly they
are identical to the printed ones. They just say that the pump must be
connected directly to the boiler and the loop must be removed if
fitting remote timer.

Thanks, anyway.
(Andrew L.)

On Sat, 06 Jan 2007 07:42:53 -0800, Andrew L. wrote:

John wrote:

In article .com,
Andrew L. writes
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.

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

--
John Alexander,

The boiler instructions are available as a .pdf online, but sadly they
are identical to the printed ones. They just say that the pump must be
connected directly to the boiler and the loop must be removed if
fitting remote timer.


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



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards

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.



"Andrew L." wrote in message
oups.com...
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.