Set button on 2442-222 and 2444-222 won't work with line voltage on the yellow sense wire.

[philgood]

I purchased some referb'd 2444-222 micro modules and though they might have just been repackaged without being QC'd since the SET buttons wouldn't work.  After wasting a couple of hours troubleshooting, I discovered that the SET button will not respond if you have 120V line voltage coming in on the yellow sense line.  Has anyone else come across this or is this common knowledge?  Any thought on if this is a design issue or is there some functional purpose?

[stusviews]

That's true. Using the set button requires that there be no input on either sense wire. That's not a flaw nor should it be a problem. Do you have a specific need to use the set button while power is live on a sense wire?

[philgood]

I am using these refurb'd units (half the price) as controller and the sense wires are attached to the switched line of some outdoor motion detecting PIRs.  I just need to be sure not to trip the PIR if trying to set one.  The only issue was the time spent figuring it out as I could find any documentation stating this fact.

[stusviews]

There is no documentation about that. Nor is any needed. Links are usually created before voltage is applied or, at least, when there's no voltage applied. Bottom line: not every possible situation is documented for every device.