Question about Electric Intermatic Wh 21 Water Heater Timer

1 Answer

There is a light on the outside of timer should it stay on all the time

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1 Answer

1) WH21 manual does not say if indicator lights up when Load is ON. That says indicator lights up when timer has power.
2) Flip manual control to reverse program and see if light stays on or goes off.

3) GE15207 water-heater-timer has two different indicator lights. One is ON when timer has power. The other is ON when Load has power. But GE timer has NO and NC terminals.

4) The reason I answered this question is that folks have problems wiring timers and then ask questions trying to piece together why timer is not working.
5) If timer is not functioning as expected, read below, or add a comment with details about your wiring.

6) Wiring WH21
240V circuits have 2 hot leads.
Hot leads from breaker connect to center terminal and to left terminal.
Leads going to Load (water heater) connect to center terminal and to right terminal
If you have leads from breaker and leads to Load reversed, timer will not function except when manual control is switched ON.
In this case, reverse wires on right and left terminals.

Posted on Dec 03, 2010

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Copy following link to identify timer:
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2) Add comment and describe timer in detail, and/or include photo of timer so expert can identify timer.

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Pull up all of the little pins around the dial.
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I have a double switch box controlling inside lights and outside lights. I installed a GE Smart Digital Timer (model 15086) to control the outside lights. In the wall box, the white wires are tied together...


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1 Answer

How do I set it and can I use it indoors?


I see nothing in the manual that says 'outdoor use only' EXCEPT timer runs on photoelectric eye.
Timer turns ON automatically at dusk, so if timer is inside, and indoor lights are ON, then timer stays OFF.

http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/hb51rc%20-%20english.ashx

http://www.intermatic.com/products/timers/consumer%20outdoor%20timers/electromechanical%20timers/hb51rc.aspx


To use timer outdoors.
Plug timer into wall.
Timer turns ON automaically at Dusk.
Rotate dial to set how long timer will stay ON.
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Set timer to turn off at dawn
Set timer to ON so lights are ON full time
Set timer to OFF so lights are off full time.
geno_3245_161.jpg

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The dawn to dusk feature is activated by photoelectric eye that senses when it gets dark.
If you put timer in a dark room, it will turn ON ... let's say to operate Christmas tree after you leave a room for the evening.
But if room stays dark, the timer will not sense when to turn off unless you also set timer to turn off 1-9 hours after ON.
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Lights stay on


manually turn the dial pass the red pointer. that shoudl shut-off the light.
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turn the dial one or more revolution till the arrow head in the center align with the time of day in the center windows.

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