Cable missing in central heating wiring

[baldelectrician]

You could do away with the timer and install a hive reciever in the area where the zone valves are.
A 2 channel hive (or similar) would work and leave you an extra core if needed as the hive only needs a 230V supply
You would still be able to connect things to this such as remote thermostats etc.

 

[davesparks]

You could do away with the timer and install a hive reciever in the area where the zone valves are.
A 2 channel hive (or similar) would work and leave you an extra core if needed as the hive only needs a 230V supply
You would still be able to connect things to this such as remote thermostats etc.

How would that solve the problem?

 

[baldelectrician]

How would that solve the problem?

Unless I am reading it wrong there is one core short at the junction box (where the zone valves / cylinder are)

The Hive (or similar) only needs a L,N,E so the reciever can be located adjacent to the joint box. As the reciever will give you seperate switched lives for HW (on), CH (on) and even HW (off) if you need it in the cylinder cupboard you will have a supply and switch wires needed at that location.

Am I missing something?

 

[davesparks]

Unless I am reading it wrong there is one core short at the junction box (where the zone valves / cylinder are)

The Hive (or similar) only needs a L,N,E so the reciever can be located adjacent to the joint box. As the reciever will give you seperate switched lives for HW (on), CH (on) and even HW (off) if you need it in the cylinder cupboard you will have a supply and switch wires needed at that location.

Am I missing something?

Yes there are 4 cores between the joint box and the boiler when it requires 5, so the pump cannot currently be connected to the pump terminal of the boiler.

The controls, whether they are wired or wireless have no bearing on this part of the circuit.

 

[baldelectrician]

Yes there are 4 cores between the joint box and the boiler when it requires 5, so the pump cannot currently be connected to the pump terminal of the boiler.

The controls, whether they are wired or wireless have no bearing on this part of the circuit.

I would have the 4 cores as
L,N,E - supply to JB (install hive reciever at joint box)
4th core pump over run

The hive adjacent to the zone valves stops the need for the s/l for the CH and HW as it can now be derived from the new hive reciever (in the cylinder cupboard)

 

[Lucien Nunes]

But if the receiver is in the cupboard, the problem is getting its output to the boiler.

 

[baldelectrician]

But if the receiver is in the cupboard, the problem is getting its output to the boiler.

I was assuming the 5 cores went from the boiler (FCU) to the cyliner cupboard.
By moving the reciever for the programmer you now have s/l for CH and HW adjacent to the pump and motorised valves, the 4 cores you have will do L/N/E/SL - boiler.
The existing programmer would now be redundant

 

[Lucien Nunes]

Operating the valves from the programmer is not the problem. It is getting SL from the valves in the cupboard to the (remote) boiler, and the boiler's pump output back to the pump in the cupboard. For these two functions there is only one core. Previously, the core was used as SL to the boiler and the pump was operated directly in parallel, but the lack of overrun caused boiler overtemp. Hence the present offering of solutions: Move the pump adjacent to the boiler, leave the pump in the cupboard and control it with a wireless link from the boiler, or ignore the boiler pump output and provide a timer in the cupboard to create the overrun.

 

[davesparks]

I would have the 4 cores as
L,N,E - supply to JB (install hive reciever at joint box)
4th core pump over run

That gives you no switched live to the boiler, so it will never work!

 

[brianmoooore]

What are the four wires going to the boiler at the moment? Earth, neutral ,switched live to boiler, and perm. live?

 

[AJshep]

There is another product I've used a few times called Mains Switch - RF Switch for Wireless Control of HVAC pumps controlled by Boilers. - https://mainsswitch.co.uk/

 

[naylorpd]

On balance the wireless link is probably the neatest option. Moving the pump takes it from a cupboard to a usable store room so is marginally less suitable, though technically sound. But at least I have two viable solutions.

The system is already run through Hive. But moving that upstairs puts it one floor further from the router so anyway would not seem like a good idea, though it seems that doesn't work anyway - the issue is the power to the pump.
Thanks

 

[davesparks]

On balance the wireless link is probably the neatest option. Moving the pump takes it from a cupboard to a usable store room so is marginally less suitable, though technically sound. But at least I have two viable solutions.

The system is already run through Hive. But moving that upstairs puts it one floor further from the router so anyway would not seem like a good idea, though it seems that doesn't work anyway - the issue is the power to the pump.
Thanks

From a technical perspective moving tbe pump is tbe simplest option which leaves you with the least number of potential failures.