Question about Intermatic & Indoor/Outdoor Rain Tight Timer

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An apartment complex where I do maintenance has intermatic outdoor timer, a very simple mechanical timer . It keeps good time tabs are set for off and on and yet sometimes the lights are on past the off setting. I suspect weekend tampering because 2 timers had the same problem monday . I can see 1 going bad but 2 at the same time thats like all your sparkplugs going bad at once. Anyway if it wasnt tampering what could it be? I pulled the "off tabs" out and they arent worn, clock keeps time. What else is there?

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Timer pins make physical contact with a metal lever that has a bit of grease. When the metal lever is pushed far enough by the pin it clicks into 'on' or 'off' position. The lever moves a slider on back of timer. The slider pushes and pulls the brass-copper contacts located on back of timer.

The metal lever is connected to manual override. So the manual override changes position with each on-off function.

1) When you click the manual override back and forth, is it loose? Or does it snap crisp and clean with no play? This would tell the general condition of the lever mechanism.

2) It seems the pins are a softer metal than the metal lever ... but if the metal lever is worn, the pins might slip past without turning off lights. You can watch the turn-off sequence and see what happens.

3) The contacts on back of timer are pushed together and pulled apart by the slider, so burned points would not cause the lights to stay on ... unless the stop that holds the stationary contact is somehow broken. You would have to take timer out of box and click it back and forth to see what the contacts are doing.

Posted on Sep 16, 2010


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1 Answer

Need manual to set timer

You posted under T-100 series outdoor timer
If you have different timer, add a comment with timer model number located inside cover.

T-104, T-103, T-101 timer manuals show on following page:
If your timer has R suffix, like T-101R, that means box is Raintight for outdoor use.
T-101R and T-101 mechanisms are identical except for box. T-101 box is indoor use.
Click model number and drop-down menu reveals link to manual

If you need simple wiring diagrams, and explanation for each T-104, T-103, T-101 timer:

Here's how to set Intermatic T100 series timers:
Lift and rotate yellow dial until current time lines up with silver pointer.
Silver pointer is stationary at 6 o'clock position.
Put ON-OFF trippers on dial at times you want ON OFF functions.
Minimum on-off is 1 hour because of tripper width.
If timer is not working, add a comment and we'll troubleshoot.

These timers have replacement trippers and clock motors at Grainger

How timer works:
Clock motor, located on back of mechanism, rotates yellow dial.
Trippers on dial push lever that turns power ON and OFF.
Off tripper pushes lever one direction.
ON tripper pushes lever opposite direction.
When lever is pushed, manual override lever clicks back and forth with audible click sound.


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1 Answer

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You posted under Intermatic electro-mechanical timers.
If you have a different timer, add a comment with model number.
I have extensive files on timers.


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