thermost wiring

[linux44]

Hi all,


I am trying to change my honeywell analog thermostat with a wireless thermostat .


My current thermostat is
T6360 Room Thermostat - Honeywell UK Heating Controls


my new thermostat is salus rt500rf
RT500RF - Wireless Programmable Room Thermostat - 868MHz


blow is the diagram of my old (current thermostat )

1 or brown is live as tested with my multimeter


2 and 3 are both neutral and can't work out the difference between them . when I put the multi meter probe on 2 the voltage is higher than it is with 3 . on three it is around 200 and on 2 around 230.


From the diagram , I think the coil symbol and the rectangle symbol between 2 and 3 means resistor , right ?


The new thermostat has a relay and then the wireless thermostat
now the relay , I have Live , Neutral, Normally open and Com(Linked live feed) connection ports.
The picture from the manual is below.

Now I connected the live to live on the new relay and pin 2 from the old thermostat to neutral and left 3 out . The relay came on but was not sending any signal to the boiler.


I swapped 2 with 3 so this time I have 1 (live ) and 3 neutral connected with 2 left alone . The boiler came on permanently and the thermostat was ignored.


what do I need to do ?


Many thanks

 

[Leesparkykent]

Hi all,


I am trying to change my honeywell analog thermostat with a wireless thermostat .


My current thermostat is
T6360 Room Thermostat - Honeywell UK Heating Controls


my new thermostat is salus rt500rf
RT500RF - Wireless Programmable Room Thermostat - 868MHz


blow is the diagram of my old (current thermostat )

1 or brown is live as tested with my multimeter


2 and 3 are both neutral and can't work out the difference between them . when I put the multi meter probe on 2 the voltage is higher than it is with 3 . on three it is around 200 and on 2 around 230.


From the diagram , I think the coil symbol and the rectangle symbol between 2 and 3 means resistor , right ?


The new thermostat has a relay and then the wireless thermostat
now the relay , I have Live , Neutral, Normally open and Com(Linked live feed) connection ports.
The picture from the manual is below.

Now I connected the live to live on the new relay and pin 2 from the old thermostat to neutral and left 3 out . The relay came on but was not sending any signal to the boiler.


I swapped 2 with 3 so this time I have 1 (live ) and 3 neutral connected with 2 left alone . The boiler came on permanently and the thermostat was ignored.


what do I need to do ?


Many thanks

the wire connected to 3 on your existing honeywell thermostat should be a switched live, 2= neutral and 1=L

 

[Leesparkykent]

if you are trying to replace the existing thermostat with the new one at the thermostat position then you wont have enough cores.

what heating system do you have? combi?

 

[davesparks]

You may need to buy a new thermostat now as you may very well have killed the one you have with your second guess at the connections.

I would strongly recommend you employ the services of a qualified electrician before you damage more than a simple thermostat.

 

[linux44]

Many thanks but how would i do that ? Can i plug it to comm on new thermostat which is described as linked live ? Or to normally open ? Or do i need a seperate system ?


is wire 3 live or neutral ?

 

[linux44]

It is combi viallant eco pro 24.

i placed the old thermostat and it is working for now

why would i have killed the new thermostat ?

 

[TJ Anderson]

On the Honeywell 2 & 3 are not both neutral. 2 is Neutral, 3 is Normally Open (Calling), 4 is Normally Closed (satisfied). The small rectangle symbol is your load connected between Normally Open and Neutral. Your new Salus has a volt free contact, which you have to put a link in (2&3) so you have a 230V switch live (that's why boiler did not fire when you first connected it).

 

[linux44]

On the Honeywell 2 & 3 are not both neutral. 2 is Neutral, 3 is Normally Open (Calling), 4 is Normally Closed (satisfied). The small rectangle symbol is your load connected between Normally Open and Neutral. Your new Salus has a volt free contact, which you have to put a link in (2&3) so you have a 230V switch live (that's why boiler did not fire when you first connected it).

many thanks

what does volt free means?


so simply plug the new relay as follow ?

1 to live
2 to neutral
3 to n/a(normallyopen )

find a short piece of wire and connect 2 and 3 , right ?

 

[TJ Anderson]

many thanks

what does volt free means?


so simply plug the new relay as follow ?

1 to live
2 to neutral
3 to n/a(normallyopen )

find a short piece of wire and connect 2 and 3 , right ?

4 Is Neutral, 3 is Live, 1 is Switched Live (to Boiler). Link 3 to 2 (to feed 230V to one side of your switched contact, this then switches onto 1 when thermostat calls for heat).

 

[linux44]

Many thanks

so it will be as follow

my brown wire which is live will go to pin 3
my grey wire which i think is netural to 4
my black wire which is boiler live to 1
and then loop and link 2 and 3 , 2 has nothing in it but 3 does .


i am unsure whether the grey or the black is netural . Black was connected to pin 3 on my old honeywell and grey to too.

i really appreciate any help with understanding above . I am confused why both grey and black wire were showing around 200v in them

multimeter needs a live and neutral so if brown was live and black was live how did i get a voltage reading?

 

[linux44]

so I managed to install it and it worked , many thanks to TJ Anderson

I did also do some research to try and understand how it works . I appreciate if anyone can clarify below for me .

The boiler it self has a L and N .

The thermostat also has a L and N .

from Boiler there is only one cable which is N( I believe ) that is going to the thermostat ( pin 4 on the boiler, vaillant ecotec pro 24 manual) .

The N from boiler is plugged into pin N/O of my thermostat . I then linked comm and L on the thermostat .
My question is how does my thermostat sends or provides L and N to the boiler when there is only N wire from the boiler to it ?

Is the L and N of the main boiler linked to the thermostat L and N ?

The thermostat is located some 5 meters away from the boiler and they have routed the cables inside the wall.
The boiler L and N is brown and blue but the thermostat L and N is brown and grey which makes me think they are separate!!

Any help will be much appreciated

 

[telectrix]

i assume the wiring to the stat. is 3 core/E, so grey will have been used for N. the stat. wiring usually goes into a wiring centre as it needs to switch the pump and valve/s from there as well as firing the boiler.

 

[linux44]

i assume the wiring to the stat. is 3 core/E, so grey will have been used for N. the stat. wiring usually goes into a wiring centre as it needs to switch the pump and valve/s from there as well as firing the boiler.[/QUOTE

not sure what stat means but the boiler had three pins for connecting wire and only one of those was used which was N.

i am now confused how does the N only on its own switches the boiler on and how does me linking comm and L helps ?

 

[TJ Anderson]

Your boiler will get its neutral from fused switch or via wiring centre, however yours is done. The RF stat requires a Neutral to operate but only switches a live. Glad you got it working anyway. Feel free to press the thanks button