Replacing timer with Hive on an old oil boiler

[stephenmitchell1802]

Hi,

I am trying to install a hive receiver & thermostat to replace an old mechanical timer connected to an old trianco redfyre 28/32 oil boiler.

Upon untangling the mass of wires contained in the old timer I am left with the following:
[FONT=arial]Mains feed from switch[/FONT]
Feed to boiler - twin and earth
Feed to pump - twin and earth
Feed from tank thermostat - twin and earth feed from old thermostat - hopefully now redundant.

I don't suppose anyone could assist with how I can wire all this together into the hive two channel receiver please. Also note there are no motorised valves.

[FONT=arial]Many thanks [/FONT]

Steve

 

[RandomGrinch]

As they say, a picture is worth a thousand words.
Can you show us the wiring behind the old timer and thermostat, and let us know what models they are?

Edit:
It sounds as if you have an old 'gravity' heating system. Did the hot water also come on when heating was selected?
If so the Hive receiver should be put into 'Gravity' mode.

 

[stephenmitchell1802]

Hi,

Please see below for thermostats and timer, not sure on models.

Yes I believe it is a gravity system as the water had to be on to run the heating.

Thanks

Steve

 

[RandomGrinch]

Usually it is possible to find information on the previous programmer and simply map the wires over to the new one.
In your case it appears that you have an AMF Venner programmer, and the wiring information that I've found doesn't seem to match yours...

AMF Venner - Wiring Diagram?

I've recently bought a Tado thermostat with Hot water to replace a very old (90s) AMF Venner CHC/W2 programmer. Problem is I cannot fathom the wiring and thought if I put all of what I know together, someone with the knowledge would be able to help me! I can't seem to find a wiring diagram for...

www.diynot.com

However, I believe a gravity system with a tank stat should be wired something like this (from a post by @stem )

If this maps out to your existing wiring, A dual channel Hive receiver should be a straightforward swap - just ignore the room stat connection and connect terminal 4 of the Hive to the pump L and tank stat satisfied.
Not forgetting to put the Hive into Gravity mode...

It may also be worth checking the power of your pump - the Hive is capable of switching 3A resistive load, or 1A inductive - a pump motor is usually an inductive load.

 

[stephenmitchell1802]

Hi,

Thanks for the diagram. Still just trying to get my head around the wiring!

So heating pump would be attached to Hive programmer as below:
Pump Live into #4 on Hive
Pump Neutral onto Neutral on Hive

Boiler I'm a bit more confused about how it connects to the programmer/thermostat. I don't suppose you have a simple diagram of how that would be mapped out please? Apologies for the stupid questions!

Thanks


Steve

 

[RandomGrinch]

Boiler I'm a bit more confused about how it connects to the programmer/thermostat. I don't suppose you have a simple diagram of how that would be mapped out please? Apologies for the stupid questions!

They're not stupid questions, but I'm afraid, what I can offer is limited.
We can draw up a diagram for the above circuit, but it doesn't mean that it will match yours, and work.

It might take some time, but the best thing to do, would be for you to draw out the wiring and connections on your existing system and we can check that it does map over to the above.

 

[stephenmitchell1802]

This is the wiring that I have and need to try and connect up:

Cheers

Steve

 

[stem]

Based on the diagram below:

Hive terminal 3 "Hot Water ON" corresponds to - Programmer "Water Live"
Hive terminal 4 "Heating ON" corresponds to - Programmer "Heating Live"

You will also need to provide a N & L to the Hive from the 'Main Feed' to provide the Hive with operating power.

As you are replacing the room thermostat with Hive, the wires originally shown below going to the Room Stat, would simply be joined together.

However, you have incorrectly shown this:

A Hot Water Cylinder Thermostat is a switch and does not have E L N connections

I believe it will correspond to the below:

If it does:

C Goes to the boiler L
2 Goes to the pump L
1 Goes to Hive 3 Hot Water ON

If it doesn't, post details of the thermostat wiring terminals.

 

[stephenmitchell1802]

That's great, will try this and report back.

Many thanks!

 

[stephenmitchell1802]

All working now, thanks both!