Recent content by paw500

I currently have a M1KP LCD Keypad located near an entry door which has a glass inset. For system status obfuscation purposes, I have set up this keypad by opting: "LEDs off 60 S after no activity". In this 'all-dark' mode, peering eyes from the outside won't see any status LEDs (such as the...

  ^^ Hope they're not the ones going into the Dreamliner.   :huh:

By the way the stamped number on the back side next to the label, which I guess is the board's serial number, of the fried board is 110301 (or it could be 110307 - it's a bit smeared)

So do we have a more descriptive understanding of what this chip does? Furthermore, how do we "protect" these boards and other components in our systems?

I pulled the new board out again to look for the marking on that chip: LM393 PFRF

When I swapped the new board in, I obviously kept the same bus address and termination jumper setting as the old bad board, since I wasn't changing any rules nor wiring. All I did to do the swap was to remove the terminal blocks, so all my wire terminations stayed the same. I thought that was...

I have an output from the ribbon whip from that board that drives a System Sensor RRS-MOD polarity reversal module that synchronizes the sounders of the smoke detectors. I didn't want to go without this life-safety component so I was a bit unnerved when I found the board was fried. Fortunately I...

I looked back at historical weather data on weatherspark.com and apparently right about when the log registered the board failure, there was a thunderstorm that hit the area. By the time I got home, other than the wet grounds, you wouldn't even have known a storm of such severity came by...

I came home from work today and noticed an "output expander lost comm" message displaying on my keypad. At first I thought it was a momentary hiccup in the databus, and so I ignored the message. However, when I checked a little later in the evening, the message remained. So I went and did some...

Haha... it's all about staying cool! The heck with water spillage... (a waterbug sensor on the floor will pick that up, right?). Actually with my two air handlers dumping into this pump, and the way the fans continue to run on lower speed when cooling demand is off during dehumidification mode...

Thanks guys for clarifying the zone hookup part. If the Elk power supply is dead, or somehow dies, the DPDT relay won't be energized regardless of the overflow switch position. So the shutdown circuit (R-G) will throw open in the relay, telling the air handler to shut down (or not allowed to...

I have a condensate pump with an overflow switch. The switch has 3 leads: N.O., COM, and N.C. When the pump is normal (not overflowing), N.C. - COM is closed. When the pump is overflowing (i.e. motor died, downstream clog…) N.O. - COM is closed. Typically this switch is wired directly to...

Perhaps something like this to avoid nuisance glitches or momentary outages: WHENEVER [GFCI Zone] BECOMES NOT SECURE THEN TURN Output 99 ON WHENEVER EVERY 1 MINUTE AND Output 99 STATE IS ON THEN DISPLAY "GFCI LOST POWER" {THEN ANNOUNCE …} WHENEVER [GFCI Zone] BECOMES SECURE...

GFCI - Ground Fault Circuit Interrupters Here are some samples: http://www.leviton.c...&minisite=10251

Thanks guys! I'll give the Relay In Box a try.