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[David Allred]

So, please send this version only in the form of the CURRENT WIRING and then we can tell you where to insert the auxiliary relay(s) primary. 

This is the the current entire circuit. 

[Steve-White]

Get yourself a DPST relay with a 110V primary and 1A or so for capacity for use as auxillary switching or isolation.  Wire one side of the coil to the line-in neutral, route the L1 or hot side of the line to the common on the relay on the control board.  The NO side of the relay will go to the other side of the auxillary switching or isolation relay.

Use the NO contacts independently for each fogger.

[Steve-White]

Don't ASSume because they use the same remote switch, their circuitry is the same.

It seems that separate fully isolated relay contacts should work to provide switch closures without interaction.

JR

And even if the circuitry was exactly the same is no guarantee that any of the units could share common control circuitry.  Even the same model may or may not be able to work in tandem off of a common switch.  Ya just never know without a schematic.

[David Allred]

Get yourself a DPST relay with a 110V primary and 1A or so for capacity for use as auxillary switching or isolation.  Wire one side of the coil to the line-in neutral, route the L1 or hot side of the line to the common on the relay on the control board.  The NO side of the relay will go to the other side of the auxillary switching or isolation relay.

Use the NO contacts independently for each fogger.

Thanks.  That confirms what I thought.

[Steve-White]

Thanks.  That confirms what I thought.

Layout your circuit and let us have a look to assist you.

[Luke Geis]

The issue I see is that if there is any kind of voltage or feedback loop in the switch circuitry of the machines, then having both the switches tied together will allow this feedback or voltage transfer to occur between them. I would be looking to make a circuit that utilizes optocouplers, or vactrols. The idea is to break the physical connection between the devices, but yet still have the switching control signal exist in any one of the two lines. I.E. the vactrols turn off one of the unused devices switch, thereby taking it out of the physical loop.

[Steve-White]

A simple DPST NO relay will provide 100% electrical isolation which it appears in this case to be necessary.

[David Allred]

Layout your circuit and let us have a look to assist you.

Your detailed description... "Get yourself a DPST relay with a 110V primary and 1A or so for capacity for use as auxillary switching or isolation.  Wire one side of the coil to the line-in neutral, route the L1 or hot side of the line to the common on the relay on the control board.  The NO side of the relay will go to the other side of the auxillary switching or isolation relay.
Use the NO contacts independently for each fogger." ... followed my drawing to he tee.  Here is the slightly clarified layout.  Thanks for the help.

[Steve-White]

^^^  Had to look again.  You are right, I misread the relay block.  Sorry sir.

I misread pins 1 & 8 on the relay as dual primary's and not the common for each side between the NO/NC contacts.

Perfect.

Let us know how it works.

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