How to wire the chime module when the coil is accessible ?

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VincentT
Posts: 46
Joined: 09 Jul 2020, 14:06

How to wire the chime module when the coil is accessible ?

Post by VincentT »

The most important thing to respect is to wire it in parrallel with the coil of the chime in most use cases. Let’s picture some examples, the wire colors refer to Figure 1 :
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Figure 1 : Standard wiring

Example 1 : LTW1171A 12VAC

There is no more simple, there are only two spots, the coil of the chime is visible and connected to the two screws. So the chime module should be connected to them :
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Figure 2 : LTW1171A 12VAC

Example 2 : LEGRAND 41651

Same example below with only two spots on the chime but the coil is not visible. LEGRAND 41651 is a 230VAC chime, do not forget to switch the chime module in HIGH position :
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Figure 3 : LEGRAND 41651

Example 3 : CHACON 84198

Now, let’s talk about the chime with an integrated transformer. I will try to give some tips to understand where to connect the chime module :
- The transformer is the big block where it is written some voltage and current informations. It is always connected to the closest screws (here 3 and 2).
- The coil of the chime is hidden from the front view but you can see some iron wires circled in yellow : this is the coil. That is why the chime module is connected between 0 and 3.
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Figure 4 : CHACON 84198

Example 4 : Honeywell D3126

Another example with a chime with an integrated transformer.
- The transformer is still connected to the closest screws (here 0 and 1).
- The coil of the chime is hidden from the front view but you can see some iron wires circled in yellow on Figure 5. When looking to the back of the chime (Figure 6), you can see that the coil is between 0 and 2 and there is a component in serie between 2 and 3 (black wires). This component is a thermal fuse to limit the current in the coil and avoid any damage.
- As you can see on front view, the chime module has been connected between 0 and 3. It is important to be in parallel with the coil and the thermal fuse to let the chime module drawn all the current possible from the transformer.
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Figure 5 : Honeywell D3126 (front view)
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Figure 6 : Honeywell D3126 (back view)
Vincent - Netatmo Hardware Engineer
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