Eberspacher Overide Switch

[robbieg]

My boat's fitted with an Eber Airtronic D4 with a mini controller switch on off unit. I'd like to set a switch up near my bunk to turn the heater on & off w/o getting up to & going into the saloon to do this at the mini controller. Can it be done-if so anyone know what wires the switch needs to go accross-looked at the wiring diagrams but can't work it out.
Cheers.

 

[PBooth]

Hi, if you interrupt the yellow wire, you can switch off the heater, this will put the heater into it's 'cool down' sequence. If you cut the yellow wire and connect a pair of wires leading to a simple switch accross it, you will be able to switch the heater off from the other cabin, but both the remote switch and the mini-controller will need to be switched on for the heater to run. The red wire on the controller is the battery positive feed to the controller, so bridging this to the yellow wire will switch the heater on remotely if the controller is off. The difficulty is in having full control at either switch. Hope this helps.

Peter

 

[robbieg]

Peter,

Thanks-very helpful.

Robbie

 

[misterg]

[ QUOTE ]
The difficulty is in having full control at either switch. Hope this helps.

[/ QUOTE ]

Could you connect the yellow wire in the same way as a 2 way domestic light circuit?

As long as the controller was calling for heat, you could switch it on or off from either end.

Yes?

Andy

 

[PBooth]

Hi, no, that wouldn't work in this situation. The domestic 2-way light switch (on stairs etc) works by reversing live and neutral to the bulb fron either switch so that if there is a live and a neutral on either side of the bulb, it lights and if there are 2 lives or 2 neutrals, it doesn't. Being AC, it doesn't matter which way round live and neutral are.
With the Eberspacher heater, the heater is switched on by a positive signal on the yellow wire and switched off when the positive signal is removed. One way round this would be to have a timer, say 30 minutes, triggered by the remote switch, so 1 press on a momentary button will let the heater run for the set time and then drop out leaving full control at the master controller.

Peter

 

[misterg]

[ QUOTE ]
Hi, no, that wouldn't work in this situation. The domestic 2-way light switch (on stairs etc) works by reversing live and neutral to the bulb fron either switch ...

{snip}

... With the Eberspacher heater, the heater is switched on by a positive signal on the yellow wire and switched off when the positive signal is removed.

[/ QUOTE ]

I don't agree with your explanation of the domestic switching arrangements, but let's not fall out about that /forums/images/graemlins/smile.gif

From your second statement, I *do* think that '2 way' switching would work. The problem is how to explain it !

You would need two '2 way' switches (or SPDT, 'changeover' or whatever you want to call them).

Break the yellow wire, and connect each end to the common terminal on a '2 way' switch (extending the end of the yellow wire to reach the far switch as necessary. Connect the corresponding 'ways' of each switch to each other.

The section A-A to B-B is the wiring that needs to run to the remote switch.

Bad ascii art:

<font class="small">Code:</font><hr /><pre>
yellow
wire A B
in
| o------------------------------------o
|________./ \._______
|
o------------------------------------o |
Local Remote |
switch switch |
_________________________________________________________|
|
| A B
yellow wire
out
</pre><hr />

When the switches are in the 'same' position, electricity can get down the yellow wire (through one or other of the interconnections). When the switches are in the 'opposite' position, then it can't.

So switching either of the switches starts or stops the heater.

Disclaimer - this works, electrically speaking, but I know nothing about Eber-watsits.

Andy

 

[fireball]

Can't see why that wouldn't work ...

 

[PBooth]

Hi, yes, I agree this will work, as long as the heater contol is left switched on (to supply the positive signal to the yellow wire.
Care to elaborate on the domestic 2-way switching?

Peter

 

[misterg]

[ QUOTE ]
Care to elaborate on the domestic 2-way switching?

[/ QUOTE ]

There are a few ways of drawing the circuit which revolve around using the available connections in commercially available fittings, but I think it's roughly the same as above: One side of the bulb is fed directly from L or N, with the other side being fed through the same arrangement of 2 way switches as I sketched above, so there's no change in polarity, etc.

Something like this (my ascii art was stretched to the limit above /forums/images/graemlins/smile.gif):

You can see one side of the bulb is always connected to N.

Picture stolen from here

Andy

 

[PBooth]

Hi, thanks for that, 30 year's misunderstanding cleared up!

Peter

 

[kennyh]

Hi, if you interrupt the yellow wire, you can switch off the heater, this will put the heater into it's 'cool down' sequence. If you cut the yellow wire and connect a pair of wires leading to a simple switch accross it, you will be able to switch the heater off from the other cabin, but both the remote switch and the mini-controller will need to be switched on for the heater to run. The red wire on the controller is the battery positive feed to the controller, so bridging this to the yellow wire will switch the heater on remotely if the controller is off. The difficulty is in having full control at either switch. Hope this helps.

Peter

Opening up an old thread - but I've a question for all you Eberspacher experts.

In the original response above, it states that the Yellow wire is used to switch the unit On or Off (connect Yellow to +12v and the unit will run - remove +12v and the unit will shutdown).

Now I've an GSM enabled Alarm system fitted to my boat that can also control relays. So I was thinking that I should be able to fit a relay between the Yellow wire (splicing into the wire to leave the original digital controller still working) and the Red +12v wire on the loom.

That way I will be able to send an SMS message to my alarm to switch the relay and thus switch on the heater.

Does that sound correct/sensible?

It would be nice to be driving up to my boat, switch on the heater enroute and get to a nice and warm cabin!!

Any thoughts?