Appliance Repair Questions? Ask a Technician for Answers ASAP
Hi .what is your current thermostat?
Ok , don't quite understand why you have rated bad service. Have just downloaded the wiring diagrams and was ready to help
Ok , no probs . are you using a heat link with it?
heat link ?
yes it is a heat link
You need two wires from your thermostat
i have wired this into AC mains with the relevant link
the last connection is the SWL
i have identified the existing thermostat wires which i can take off and use for the NEST thermostat and connect to the heat link
its the SWL im having trouble identifiying/connecting
there is a timer/controller which im told to leave in situe and leave the HW timer as is but make sure the timer for CH is on always
Come from programmer CH out 4 and into 2 on heat link. 3 on heat link , out to swl
i have the wiring diagram from the web of the RWB9 programmer
this is wired in my kitchen the this is wired upstairs to a mass junction box(this is where the existing thermostat is wired to and where i will remove to use for the new NEST thermostat)
the programmer has 6 connections:
N - to mains fuse
1 - HW off
2 - ch off
I have the wiring diagram for your programmer
3 hw on
these are wired then i think go upstairs to this mass junction box
Ok . I understand .do you have two motorised valves or one
could you help not sure what a motorised valve is ?
Your programmer for central heating will come out of 4 this will connect in your wiring box to common or 1 in your existing thermostat and then out of your existing stat wiring from 3 to your motorised valve. Will find a picture of a m valve
ok ill check
Or this is a 3 port . first was a 2 port
just getting a pic now
do you have an email i will send you the pic as it wont let me load them
They won't allow email to come up. Can you see the images I uploaded ?
Ok , do you have any of these?
its just this pc doest have email and i have taken the pictures with my ipad but the attatchment icon is not there as it is on my pc
The way I do it is copy the picture from another page , then paste it in
do you have an email address i could send you these pictures
i have something similar in the boiler cupboard
Just answer won't allow email addresses to come up
it says MID postion actuator code
looks similar to your photos
Ok . the orange wire from your mid position valve is the switched live back to fire the boiler
ok so if i identify this orange wire do i remove the other junction box wiring from this terminal or just t into and connect to NEST heat controller
The order is fused spur to programmer . out of programmer heating on(4) to thermostat ç, out of thermostat 3 , onto mid pos valve white wire, out of mid pos valve orange and onto boiler swl. So the nest will replace the current thermostat .this is where the heat unit is wired in
i have checked the junction box upstairs and i can confirm that the orange wire from the motorised valve is connected to a brown wire (which in turn routes direct to the water boiler cylinder) on the other side of the choc block it is connected to a yellow wire which runs down stairs.
this wire (yellow) im sure routes down to the current controllers 3 hw on, within the RWB9
shall i remove this from the RWB9
The number 2 connection on the heat unit is wired into the programmer 4 connection.this is where your thermostat in is connected.
yes ive got that
No all wiring connection will be made in the wiring centre that thge programmer etc goes to
i know where the existing thermostat wires are on the junction box, ill remove these and use them to connect the NEST thermostat. The existing yellow wire (terminal 3 on the RWB9) routes to the junction box then to the orange cable as discussed, this is the position of the CFH (terminal 3 on nest)
Where the programmer goes to is your 2 on heat unit. You will have to work out your existing thermostat wiring so you can find the other incoming thermostat wire. This will be you heat unit 3. Then you are nearly there
the NEST diagrams terminal 2 states it can be linked to the fuse spur LIVE , i have put a link cable in as per the documentation
Use the two areold thermostat wires for your heat unit t1 an t2. Take photos of all wiring before you do anything just in case .or write down numbers and colours
link cable from the heat links live
No 2 isn't live
Neutral and live go into neutral and live in heat unit.
it states that in the NEST diagram that it is , the one im looking at
it shows a t of from the fused spur to the power supply for the heat link then onto terminal 2
Not in the one I'm looking at
Go to page 13
Connect the control circuit
What you are looking at must if the nest is the only control you have
yes i see that , but in the install book i have it shows you can t off from the live feed to the heat link onto 2
saving you having to run another cable/core to the heat link
ok i think im there i know the thermostat wires and which ones to remove
Your be missing out your progr if you do it that way
the yellow wire from the RWB9 (yellow terminal 3) connects to the junction box upstairs and then onto the orange wire as we have discussed
Your programmer will be bypassed
for HW too >
Not for hot water , just your heating
This shows 4 for CH on for your programmer
ok ill will find the common as per your info coming to the junction box and connect to heat controller terminal 2
ref the yellow for CFH (heat controller terminal 3) shall i leave in connected to the RWB9 to ?
Yes that is for hot water , that can be left as it is
Would you mind re rating? You can always come back if you need further help ,all the best with it