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Thread: Mystery Black Box
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03-26-2010, 02:25 AM #1
Mystery Black Box
Does anybody know what this small black box is attached to the condensing unit. It is about the size of a pack of cards/cigarettes. It has two red l.e.d. lights on it.
I don't know if this had anything to do with the device, but the unit would turn on/off on it's own throughout the inspection even though the thermostat was set to it's lowest setting.
Similar Threads:Last edited by Matthew Barnicle; 03-26-2010 at 02:27 AM. Reason: add photo
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03-26-2010, 02:28 AM #2
Re: Mystery Black Box
Sorry, here is the photo
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03-26-2010, 06:01 AM #3
Re: Mystery Black Box
Need to know what it is wired to. Contactor? Pressure switch?
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03-26-2010, 07:51 AM #4
Re: Mystery Black Box
Some electrical utilities companyies have a program that permits them to cycle residential condensing units on and off to shave demand peaks off of the grid. In Utah-in my area the electrical company offers a one time "gift", like $25 or something to permit them to install this on your condensing unit.
In fact the State legislators have been working on a program to force home owners to do this.
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03-26-2010, 02:29 PM #5
Re: Mystery Black Box
Never have seen one myself. Just curious if it could be some type of alarm device in case someone was attempting to steal the unit. I've heard of such devices but have yet to come across one in the field. I understand that one of the larger alarm protection service companies have such a device.
Just a thought.
rick
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03-26-2010, 03:03 PM #6
Re: Mystery Black Box
Yes, part of the alarm system was an afterthought I had when I left the inspection. I also wondered if it was shutting down the unit anytime a door was open for any length of time...there was an alarm at the house and the keypad did beep as is typical when doors and windows were opened. I have seen such devices on hotel room doors/windows, but wouldn't think anyone would put it on their own home.
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03-26-2010, 03:05 PM #7
Re: Mystery Black Box
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03-26-2010, 04:25 PM #8
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03-29-2010, 09:33 PM #9
Re: Mystery Black Box
maybe its a lightning surge protector?
looks like the ones you mount on a electrical panel
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03-30-2010, 03:53 AM #10
Re: Mystery Black Box
Having the 2 red lights on it I'd have to think it's a tattle tale device that could monitor system pressure and notify a tech to intermittant problems. It could be wired to the high and low pressure switches.
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