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[Noam]

The three-phase theory is interesting, but the OP said in the first post that it didn't work, even with the controller and the module in the same outlet.

[leonpc]

@ Jeff

You mentioned that HVAC unit with variable speed blower motors can be bad for X10.  Since I have 3 of them in my house I was wondering if you have a recommendation on how to isolate these as they are directly wired into my distribution panel...

Thanks

Leon

[JeffVolp]

You mentioned that HVAC unit with variable speed blower motors can be bad for X10.  Since I have 3 of them in my house I was wondering if you have a recommendation on how to isolate these as they are directly wired into my distribution panel...

Isolate each circuit with a big X10 XPF filter (or 2 if it is a 240V circuit).

Jeff

[dave w]

You mentioned that HVAC unit with variable speed blower motors can be bad for X10.  Since I have 3 of them in my house I was wondering if you have a recommendation on how to isolate these as they are directly wired into my distribution panel...

Try and determine first if the blower is actually putting out noise. I have a varible speed blower and it is not a problem, (verified by Jeff's XTBM signal/noise meter).

[bkenobi]

My HVAC has a variable speed motor and that does not cause noise.  I find that the circuit board does cause noise though.  I have the same issue with a dryer circuit where the noise is present when the unit is on but does not change when it is running (thus the circuit is to blame).  In my case, the HVAC circuit board could be filtered with a single XPF but it would possibly void my installer's warranty if I were to install it myself so I haven't tried.  Jeff gave me a schematic for installing a pair of XPF for the dryer circuit, but I was unable to get it to function correctly (no difference in noise so obviously hooked up wrong) so I disconnected it.