How to wire a Siemens RWB27 timeswitch

hanloj1

Hi Folks. I purchased a Siemens RWB27 digital timer for my central heating. I know where to wire the load and neutral but haven't a clue where to wire the wire that turns on the valves and boiler. I have attached a few pictures of the boiler setup if it helps.

Thanks in advance lads.

New timer:


Back of new timer:


Wirig diagram of new timer:


Old timer:


Back of old timer:


Boiler:


Plugs in shed for boiler:


Valves for boiler:

trodsky

Have you installed the system yet? I'm thinking about buying one of these.

hanloj1

No not yet. I'm stumped on where to wire the switch wire. It looks like a good timer.

meercat

i assume you are just replacing the old apt timer for the new siemens

if so
turn the power off

the 2 neutral wires on apt connect to N on siemens clock(blue cables)
the 2 brown wires on apt connect to L on siemens clock
the single brown wire on apt connects to 4 on siemens clock

when you have done these connections insert a small loop cable between terminals
L and 2

put the clock back on base plate and turn power back on

hanloj1

Yep, all i want is a straight swap. Thanks a million for the help.

meercat

hanloj1 wrote: »

Yep, all i want is a straight swap. Thanks a million for the help.

no worries
come back with an update if all is well

hanloj1

You were spot on. Thanks again. The wife will be happy out now.

Patrick.Walsh

Hi
This is my first post on Boards. I too want to replace an apt with a Siemens RWb27 on a gas boiler, but I have 3 sets of brown/blue connections to the apt, 2 for the incoming power and 4 to control the boiler. Can anyone sort this out for me?

paddy

IAC

meercat wrote: »

i assume you are just replacing the old apt timer for the new siemens

if so
turn the power off

the 2 neutral wires on apt connect to N on siemens clock(blue cables)
the 2 brown wires on apt connect to L on siemens clock
the single brown wire on apt connects to 4 on siemens clock

when you have done these connections insert a small loop cable between terminals
L and 2

put the clock back on base plate and turn power back on

Hi, I wonder if you can help. I bought the same timer and am replacing the same timer as the post above. Problem I have is that it is wired L1 - black L2 - brown and L3 Blue.
I can't get the timer to work on old one so I bought the Siemens one and wondering how to wire it up

Sleeper12

IAC wrote:

Hi, I wonder if you can help. I bought the same timer and am replacing the same timer as the post above. Problem I have is that it is wired L1 - black L2 - brown and L3 Blue. I can't get the timer to work on old one so I bought the Siemens one and wondering how to wire it up

Follow instructions in post 4. If you can't follow them you might be safer calling in a sparks