Kilowatt wrote:
Folks thanks for all the replies.

Jim I posted the same question over in rec.food.equipment so take a
look over there also for possible replies.

Ken Thanks for the pointers although I'm still not clear on how a
ignitor becomes a sensor...but there's got to be a sensor somewhere.
I'll clean em and see what happens. Do you remember what that
circuit/black box cost you?
Greg;
My guess (educated - sort of) is that a high frequency low voltage
signal is applied to all the igniter electrodes whenever *any* control
knob is turned to the on position. This signal allows a comparator
circuit to measure resistance from the probe through the spark gap to
ground. When the resistance falls below a certain value the comparator
circuit signals the high voltage spark circuit to turn on - there is a
separate high frequency and voltage circuit for each burner. The
different frequencies allow the two circuits to operate through a common
electrode without cross interference. Any build-up of conductive
material (eg. burnt on carbon - salt, moisture) on the insulator around
the spark electrode will produce the symptoms you see.
That's the best I can do to explain it.
The black box I originally replaced was potted with a transparent epoxy
and it was easy to see the four separate sections in it.
The replacement 'black box' (kitchenaid) cost me somewhere in the
neighborhood of
$450.00 CDN.
Hope this helps.
Ken.
PS: Penmart (aka Sheldon) was the first person on this (or any other NG) to
earn a place in my kill file.
His childish and in many cases plain-nasty-drivel isn't missed.

Penmart - I have never understood those kinds of responses to
newsgroup questions...maybe it's something personal between you and
Ken, I really don't care, but if you have some knowledge you'd like
to share, I'm listening. As far as Viking QC, I'm inclined to agree
with you...but if it had been wired incorrectly from the factory why
did these symptoms appear after three years of working fine.

Mompegram - thanks for the referal to rec.food.equipment I posted
over there this morning.

Thanks again,
Greg
"Kilowatt" wrote in message
om...
I hope this is the correct group for a query such as this if not
could someone point me in the right direction.

We have a Viking 30in VGIC and when we turn on the right front
burner the right rear and left rear ignitors keep
clacking(reigniting). The RF works fine, ignites the gas, and we get
a nice flame. This symptom only occurs on the RF. The LF work fine.
The LR lights fine but it does fire the RR ignitor ONCE. The RR
works fine.

Basically we can get all the burners to light correctly but the RF
causes itself and two other ignitors to fire.

I've looked at the wiring diagram but it doesn't really help as the
reignitor circuitry is in a "black box" anyway. Right know that's
where I'm guessing the failure is occuring but I don't know under
what conditions the reignitor circuit asks the ignitor to fire.

Can anyone explain how the reignitor circuit knows when to fire the
ignitor?

Any suggestions, I am pretty experinced with troubleshooting simple
electronic/electrical circuits?

Thanks,
Greg


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