Friedland Door Bell Chime - Adding a 2nd Chime Box?

[Addz]

Newbie Post so please be gentle!

I have a circa 1980's Friedland 107 Door Bell Chime (connected to a simple Bell Push)

and it is connected via the usual bell wire to a Transformer next to the CU which is a Friedland 752 (8v / 1amp) :

and I would like to add a 2nd Door Chime at the other end of the house.

I have bought the newer version of the original Chime - a Friedland (Honeywell) D107 so it is similar in looks and sound.

The original Door Chime is wired like this :

Coming out of the Transformer at the CU is 2 wires :

The new Door Chime is around 10m cable distance away.

How best to I tap into the original circuit to add the 2nd Door Chime, and what terminals on the new Door Chime should I connect it to?

Any advice would be very much appreciated

 

[flameport]

New chime is wired the same way - terminals 2&3 on the old chime connect to 2&3 on the new one.
The transformer will need to be changed for a 2A version, that 1A transformer can only supply a single chime.

 

[Addz]

Thanks Flameport!

Stupid question - so the terminal numbers on the new one are not in the same position as the original Chime - so would it be 2 and 3 as it is labelled on the new one (in their different locations), or 0F and T3 as the terminals are positioned on the new one (to mirror the terminal locations on the old Chime)?

New Chime Wiring Diagram to assist:

 

[flameport]

OF and T3, which are the two that have the thin copper wires that go to the solenoid inside the chime. The other two are just spares not connected to anything so they can be used to connect the push button to the chime if required, or for when the chime is used with batteries and not a transformer.

 

[winston1]

The transformer will need to be changed for a 2A version, that 1A transformer can only supply a single chime.

But try it first. The load is only on for a few seconds occasionally so no harm will be done and it may work fine.

 

[Addz]

Sorry for another stupid question. The only section of the wiring I can easily get to is the 2 wires coming out of the transformer. Can I tap into it here?

So it would effectively be like this (with the old bell chime on the left and the new one on the right):

Would this work? Or is there a problem with it being on the other side of the bell push?

 

[flameport]

Would this work?

No, the second chime will get power continuously which will likely result in it overheating and never working again.

 

[Addz]

Thanks Flameport, your advice has been really helpful.

So I have temp connected the 2nd Bell Chime from the terminals within the 1st Bell Chime, and I can now get the 2nd Chime to quietly Dong (it doesn't Ding!).

Am I right in saying that is due to the length of temp cable I am using (and a 2amp Transformer would fix that problem as you suggest?).

Of course, the above is superceeded by the fact I cannot get to the wiring that goes from the 1st Bell Chime to the Bell Push, as it is all buried under plaster and within the frame of my new Porch! Bugger!

Is there any way around this?

 

[SUNRAY]

Thanks Flameport, your advice has been really helpful.

So I have temp connected the 2nd Bell Chime from the terminals within the 1st Bell Chime, and I can now get the 2nd Chime to quietly Dong (it doesn't Ding!).

View attachment 211532

View attachment 211533

Am I right in saying that is due to the length of temp cable I am using (and a 2amp Transformer would fix that problem).

Of course, the above is superceeded by the fact I cannot get to the wiring that goes from the 1st Bell Chime to the Bell Push, as it is all buried under plaster and within the frame of my new Porch! Bugger!

Is there any way around this?

Yes. use a 18V 1A transformer and wire them in series.

 

[RF Lighting]

Try connecting the temporary wire to your new chime directly to the existing bell wire and do not connect it to your old chime to prove your new wiring is connected to the right terminals, and also that one chime works fine but having two together overloads the transformer.

 

[SUNRAY]

It's been 30 years since I looked but IIRC the coil is in the order of 15Ω so the current will be in the order of 0.5A, therefore it's not usually an overload issue, it's more usually due to voltdrop in the wiring and the only way to overcome that is to increase the transformer voltage. Tacking the second on to the first like this will usually result in a very noticeable difference in performance between the two, it will be improved if you can find the junction between the existing 3 cables and connect there to eliminate some of the volt drop to the first chime.

For what it's worth the twice I've been in this position I've ended up running in series, one I used 2x 8V transformers in series as the second was already to hand but the other situation had well over 100m of cable so I used 24V transformer [stock items for me].
Other benefit is the second chime can be added anywhere in the circuit without it making a difference.

 

[SUNRAY]

I struggle to get this into previous post.

 

[Addz]

Try connecting the temporary wire to your new chime directly to the existing bell wire and do not connect it to your old chime to prove your new wiring is connected to the right terminals, and also that one chime works fine but having two together overloads the transformer.

OK mate, I shall do this in the morning

 

[Addz]

I struggle to get this into previous post.
View attachment 211584

OK I have done a better diagram to assist my plight

Here is my current situation:

 

[Addz]

Can I wire it like below and beef up the transformer if required? :