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Old 01-16-2012, 06:37 PM   #1
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Digital timer - help with symbols and wiring needed


I am trying to set up a programmable digital timer to run off a 12V battery that will power a flourescent RV light fixture. It did not come with any installation instruction or other explanation on setting it up. I do not have any electrical experience. The top has two slots labeled 1 and 2 and the bottom has three slots labeled 3-5. There is a puzzling circular symbol with a wavy mark under slots 1 & 2 and a symbol for a switch over slots 3-5. Can anyone tell me what these symbols mean and how to wire this timer? I've attached a pdf file with pictures to show timer and symbols. Also, what do the letters "L", "N", "NO", and "NC" mean?

Thanks,
Rick
Attached Files
File Type: pdf Weekly Programmable Timer.pdf (83.1 KB, 49 views)

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Old 01-16-2012, 06:45 PM   #2
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Digital timer - help with symbols and wiring needed


L is line power 24V/115V? N is the neutral ...NO is normally OPEN -l l- contacts,and NC is normally CLOSED -l\l- contacts.normally means with the timer in your hand no power applied.if you want the timer to turn something ON use N.O. with ON/OFF times

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Old 01-16-2012, 06:49 PM   #3
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Digital timer - help with symbols and wiring needed


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Originally Posted by biggles View Post
L is line power 24V/115V? N is the neutral ...NO is normally CLOSED contacts,and NC is normally OPEN contacts.normally means with the timer in your hand no power applied.if you want the timer to turn something ON use N.O. with ON/OFF times
I think you have that backwards.
A NO contact is open without power applied.
A NC contact is closed without power applied.
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Old 01-16-2012, 07:09 PM   #4
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Digital timer - help with symbols and wiring needed


So does that mean that I connect a wire from the battery out to slot #5 labelled "NO" and then another wire from slot 4 out to the light fixture?
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Old 01-16-2012, 07:19 PM   #5
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Digital timer - help with symbols and wiring needed


just break the hot 12V+ thru the contacts (battery to timer timer to light) so when it opens the contacts the power stops at the timer the NEG (-) from the battery goes direct to the light.the contact position depends on what you want to do turn it on or turn it off 4-5-6 middle # is common between contacts
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Old 01-16-2012, 07:29 PM   #6
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Digital timer - help with symbols and wiring needed


So if I understand right "NO" means "normally open" which means that if I hook up my light to this switch it will be off until the timer turns it on and if I hook it up to "NC" the circuit is "normally closed which means the light will remain on until the timer turns it off. Am I right?

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