timer and stat wiring

[alexmurchison]

im replacing an old programmable thermostat with a single channel TS715si programmer and a seperate RETB RF + RX1 room stat. can anyone in simple terms explain wiring. the TS715SI is as i think


live to live
neutral to neutral
then wire from plug 8 on boiler term block to plug 4 (N/0) on
and wire from plug 9 on boiler term block to plug 1 (com)

the book says to link live to term 1 (com)on the programmer ?? why, and is this corrrect

retb rf is similar

L = L
N = N
THEN im unsure from herre, anyone got any constructive info

 

[M.Joshi]

then wire from plug 8 on boiler term block to plug 4 (N/0) on
and wire from plug 9 on boiler term block to plug 1 (com)

Which boiler do you have? Or are you referring to the wiring centre (box where all the wires converge)?

Also, what is the make and model of your existing programmable thermostat?

 

[alexmurchison]

forgot to say,, boiler is a grant vortex combi

 

[alexmurchison]

also, room stat i replacing is the tp5000, sorry forgot to add all this, only reason for changing is, there is no real control over the boiler with th tp5000 model, only varients in temp throughout the day, fairly uneconomical to be honest

 

[dancinplumba]

can you not program temp to 5 degrees when you don't want heating on ?

 

[M.Joshi]

Is it the Combi V3 or Combi Max?

Do the terminal block connections correspond to those on page 49 of this manual:

[DLMURL]http://www.grantuk.com/downloads/combi-tech-manual.pdf[/DLMURL]

 

[tamz]

A separate programmer and stat will be no different or better than a correctly set tp5000

 

[alexmurchison]

yes you can, ideally at night turn to low demand but it better IMO to programme the boiler to come on for a set period of time then control the temp in that set time. whereas the tp5000 allows the demand to be there 24hrs a day, unless like you say, turn it down to say 5 degrees. its ok if you are used to this system, but the person who its for is old and doesnt understand these fancy functions and would just prefer the ON / OFF function

 

[M.Joshi]

A separate programmer and stat will be no different or better than a correctly set tp5000

That's what I was just thinking!

The wireless room thermostat could have been added on with the old programable thermostat that you had.

 

[alexmurchison]

hi M Joshi, yes section 12.3 is the correct diagram for this model as i have in the manual

 

[dancinplumba]

put a honeywell 921 in, it has off, manual and auto setting. and simple to turn on(manual) or off with 1 switch also have big bright display 🙂
imo

 

[alexmurchison]

i am not debating that the tp5000 is not any good, its more for ease of use for the user.You have to constantly adjust the old programmer to suit your needs, ie if you are not home all day or in for a few hours, its constant adjusting temp for demand

 

[M.Joshi]

the book says to link live to term 1 (com)on the programmer ?? why, and is this corrrect

I just read that in the TS715si programmer manual too! It doesn't make sense? Looking at diagram 12.4 in the boiler manual, if terminal 1 on the programmer was connected to live, then terminal 9 on the boiler would be permanently live too. This would mean that the programmer is continuously calling for heat regardless of the program setting???

 

[alexmurchison]

it says the same for the retb rf stat. link live to term 2 of the rx 1 reciever.



the tp5000 uses the same rx1 reciever and it has not linked the live as it says. I presume, that it doesnt need linking up in either the programmer or stat as it is a 2 wire setup , perhaps not a single wire setup , ie my heatslave only uses one wire for demand and the other is the linked live (com) to complete the circuit

 

[M.Joshi]

I am assuming that the common terminal on the TP5000 was not connected to live?

Also, the boiler manual states that the output contacts from the timer must be volt free.

In this case, I don't think you need to link terminal 1 to live on the programmer.

 

[alexmurchison]

ok, this is starting to clear things up a little , so if i go along with my 1st post ........L = L.....N = N......BOILER (9) = TERM 1.....BOILER (8) = TERM 1
THEN RX1 RECIEVER SHOULD BE SIMILAR L = L.....N = N......BOILER (5) = RECIEVER 2 (COM)......BOILER (4) = RECIEVER 3 (ZONE 1 ON)

 

[M.Joshi]

ok, this is starting to clear things up a little , so if i go along with my 1st post ........L = L.....N = N......BOILER (9) = TERM 1.....BOILER (8) = TERM 1
THEN RX1 RECIEVER SHOULD BE SIMILAR L = L.....N = N......BOILER (5) = RECIEVER 2 (COM)......BOILER (4) = RECIEVER 3 (ZONE 1 ON)

Boiler (9) = Term 1 (programmer)
Boiler (8) = Term 4 (programmer)

Have a look at diagram 12.5 on page 51 of the boiler manual. It has the correct wiring for the TS715.

Boiler (4) & Boiler (5) either way round to the receiver COM and NO contacts. Remember to remove the link between Boiler 4 & 5 if it is still in place.

 

[alexmurchison]

Boiler (9) = Term 1 (programmer)
Boiler (8) = Term 4 (programmer)

Have a look at diagram 12.5 on page 51 of the boiler manual. It has the correct wiring for the TS715.

Boiler (4) & Boiler (5) either way round to the receiver COM and NO contacts. Remember to remove the link between Boiler 4 & 5 if it is still in place.

ok. thank you very much for your advice / assistance, shall go get it done next week then