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Re: Loss of temp sensors due lighting.
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Posted by Bob on Saturday, 4 July 2009, at 2:38 p.m.,
in response to Re: Loss of temp sensors due lighting., posted by Phil
Thanks Phil for clarifying the difference between DS9097U and the WEL bus grounding.
I tried to display my wiring layout but the spaces get removed when posting. Used dots as spaces...
[WEL]----[T-StatMonitor]----+-+--[GSHP-Sensors]
|. |. . . . . . . . . . . .. . . . . . . . . . | . |
|.+---[InsideAirSensor] . . . . | . +--[DHW/DSH-Sensors]
| . . . . . . . . . . . . .. . . . . . . . . . |
+-----[OutsideAirSensor] . . +----[GroundLoopSensors]
I just checked the tstat-monitor schematic and see the 1N5908 zener diode in the circuit. I suspected that tstat monitor must have suppressed the surge because the sensors connected directly to the WEL survived. It is still weird that the two DHW tank sensors on the bus after the tstat monitor survived.
Regarding the use of twisted pair wire (all my cable was CAT 5 UTP), the weather guys mention that minimum voltage/current is still inducted into twisted pair wiring. However when dealing with millions of volts in a lightning strike and its magnetic field, induction greater than 300 watts is still possible.
h ttp://pond1.gladstonefamily.net:8080/surge-protection.html
Question is could several of the 'inline protection' TVS devices be placed into the bus to isolate and protect groups of sensors?
I now have all the sensors replaced except the six outside ground loop sensors. I think I will hold off on this for now.
Thanks again,
Bob G
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