Re: Alarm Stays On
- From: frank1492 <frank1492@xxxxxxxxxxx>
- Date: Thu, 07 Jun 2012 22:55:09 -0400
Those must be much newer units. There is nothing digital in this one.'
Ademco 1023-12 2/85..
On Thu, 07 Jun 2012 18:33:38 -0500, G. Morgan
Here's a weird one. I have an old Ademco hard-wired alarm panel which
has been running well since 1985. Recently it went into alarm
condition but would not shut off. (For a momentary opening of the
closed loop, it's supposed to shut off after 12 minutes.
The closed loop contains a Dual Tec PIR/microwave combo unit
which has a very low false alarm rate. When it false alarmed recently,
I forgave it, but the alarm stayed on so I assumed it was "latching"
due to some failure and not shutting off. I replaced it with a second
unit, and watched the LED's carefully. The new one was clearly working
On testing the system, I simulated an alarm condition and
watched the LEDs turn on and off, so I knew the OC was momentary. I
even checked the output with a meter. The alarm did not turn off after
I then did a manual open and reclose of the loop with the Dual
Tec out of the circuit. The alarm cut off after 12 minutes.
What is going on here? The Ademco recognizes the opening of the
loop but does not recognize the closing, but *only* when the closing
is done by the Dual Tec and not manually.
Ideas? I'd say the relay on the DT is not re-closing properly
but the other unit apparently did the same thing. The panel must think
it sees something other than a closed loop!
A real hair tearer. (Thanks for help.)
P.S. The loop has a 2000 ohm terminating resistor.
Each time the sensor is tripped, a new alarm is generated - thus
adding another 12 minutes. You probably have a Vista-10 or 4110XM
both have an adjustable siren time-out. It also has a "runaway"
feature so a faulty sensor with not alarm after "x" amount of
All this is done via the installer's level of programming. If
your system is monitored, you should not attempt to program it or
you may mess up something important. If you give me the exact
model number (on the circuit board label) I'll shoot you an
installer's manual. Hopefully the panel is not 'locked', so only
the alarmco can access it. Most are not locked.
Also, you will need a 6160 or 6139 alpha keypad to see what you're
doing while programming. Hopefully you already have one in the
system, rather than the cheaper fixed-English display.
- Alarm Stays On
- From: frank1492
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