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Making assumptions

J

JoeRaisin

Jan 1, 1970
0
I have never dealt with Europlex but made erroneous assumptions
regarding the loops.

New business taking over an old Circuit City building.

Nearly a hundred protection points through 4 splice points each with 3
expanders in it.

Using a V-128FBPN to replace the Europlex and the new folks only want
doors and a few motions - 21 points in total including poc's to Simplex
Panel.

Got all the wires ID'd and found each splice point had 3 6-conductors
going to head end which meant I could run each point right to the head
end and do everything with two expanders instead of four - Oh sure, I
did have one splice box that now has NO spares... but hopefully they
will not need any more points from that area.

Couldn't find the eolr's. Finally I had a thought and did what I should
have done from the get go - I metered the door contacts.

While normal (magnet applied) I got 500 ohm reading. Tripped (magnet
removed) I got 1.5 Kohms.

Now just what the heck am I to do with that? Sure, great for
supervision - shitty for changing out the panel.

Nothing for it but to order 7 door contacts and 4 overhead door contacts.

For even more fun and excitement, the Fire Marshall did his walk through
and revoked their temp occupancy 'cause they needed more emergency exits
- guess there were plenty for a Circuit City but not for a fireworks store.

But I'm ready for 'em, wires run and all set to install the contacts
when the doors are done. There were some construction type fellas there
Friday making all sorts of noise as they made holes in the block.

Should be able to wrap it up Monday...
 
G

G. Morgan

Jan 1, 1970
0
Jim said:
If you feel guilty about it .... you could always leave a note in the panel.

"Dear next alarm guy. Somewhere on the burg loop there are 700 ohm resistors added to the circuit to make up the difference in total loop resistance. Good luck. Signed: Last alarm guy. Consulting Fee: $95.00 per hour. "

True story, an ADT fire alarm panel (SK 5208) I opened the can and
noticed resistors in parallel to the detection zones. At first I
thought, oh man... they didn't supervise the circuit. Then I
noticed on the door written with a Sharpie and arrows drawn to the
terminals: "These are NOT resistors, they are *equalizers*!"
OMG.

I just locked the can back up. I was there re-doing & taking over
ADT's burg. system, that didn't work at all.
 
D

doug

Jan 1, 1970
0
ABLE1 said:
Add 700 ohms at the contacts a be done with it.

Les

Unless I'm misreading the original post, if the 700 ohm is placed in series
with the contact that will result in 1.2K with the door closed and 2.2K with
the door open.

I think the V-128FB will see the zone as normal with the door open, I'm not
sure how the panel will interpret the circuit at 1.2K with the door closed,
probably as a short and will show an open zone or possible even still show
as normal depending on the tolerance of the panel.

Doug
 
J

JoeRaisin

Jan 1, 1970
0
Unless I'm misreading the original post, if the 700 ohm is placed in series
with the contact that will result in 1.2K with the door closed and 2.2K with
the door open.

I think the V-128FB will see the zone as normal with the door open, I'm not
sure how the panel will interpret the circuit at 1.2K with the door closed,
probably as a short and will show an open zone or possible even still show
as normal depending on the tolerance of the panel.

Doug

Most of the doors were landed on one of the expanders (4208U) so we are
looking for 10K. So 9.5 in series could have worked, 1.5 is low enough
to make a reliable point.

But it's over and done. We got 10 hrs added to the job for replacing 11
contacts (4 oh doors, 7 regular).
 
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