Question about Intermatic WH40 - Water Heater Time Switch - NEMA 1 Indoor Steel Case - DPS

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How to set clock time for intermatic wh40 electric ?

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DO NOT attempt to move the pointer!

With the power OFF, pull and hold the timer dial OUT. Twist the dial in either direction to align the current time with the pointer. Let the dial return to the original (in) position. You'll have to do this whenever DST changes and after power outages.

The manual for the WH40 can be downloaded for free, here.

Please rate this reply - thanks!

Posted on Dec 17, 2010

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The black wire on the inside panel sparks


You posted 2 questions.
Add a comment to clarify problem
One question says black wire is sparking is inside water heater, and this question says black wire is sparking inside the panel and is posted under WH40 water heater timer.

If wire is sparking, then it is not attached firmly, or wire is not attached correctly, or there may be too many amps drawn across the terminal.
WH40 has 40 amp terminals and will handle all residential water heaters.

Open following links for instruction how to avoid sparking, and avoid fires inside timer:
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html#fire
Open following link to see how to apply wire nut:
http://waterheatertimer.org/How-to-twist-electric-wire.html

Oct 08, 2011 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

Just replaced my electric water heater this morning. When power was restored, my intermatic timer begain making a high-pitched squeal. What is this?


Probably some dirt fell on the gears inside timer.
Turn off power and spray WD40 on gears.
Or blow out timer with air.

Open following link for photos, illustrations and resources.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html#clock

Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
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Sep 06, 2011 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

My WH40 makes a loud hum, but it works well. It is about 20 years old, and didn't make this noise until fairly recently. Could the motor be requiring replacing?


1) Yes, the noise is from clock motor turning the gears.
When timer is new, parts have a bit of white grease on them.
Turn off power and spray WD 40 or apply some white grease and see if that helps.

2) Yes
WG1573 240Volt clock motor is going bad.
Tip out mechanism using thumb spring located top inside box and check clock motor number.

Buy
WG1573 240Volt clock motor and extra trippers from Granger number 1PNK2
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

http://waterheatertimer.org/How-to-wire-WH40.html

Notice on image below, there is a bit of white grease on lever.
This photo is from new WH40.
geno_3245_290.jpg

Feb 22, 2011 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

I have an intermatic WH40 timer that works great when it is "On". However, once the unit encounters the "Off tripper", it turns the hot water power off, but the timer dial no longer...


If this is new installation, you have Load wires and Breaker wires reversed.
http://waterheatertimer.org/How-to-wire-WH40.html
http://waterheatertimer.org/images/WH40-water-heater-circuit-5.jpg


Hot wires from breaker connect to terminals 1 and 3 ... notice also there are small white wires connected to terminals 1 and 3.
Small white wires go to 240Volt clock motor located on back of mechanism, so these terminals have to be Hot all the time so clock motor is ON all the time >> thus hot wires from breaker connect to same terminals that have small white wires.

Load wires to water heater connect to terminals 2 and 4

Reverse your wires and things should work fine.

geno_3245_138.jpg

Dec 05, 2010 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

Timer will not turn water heater ON at set time, has to be done manually. However, it will turn water heater OFF at set time.


If this is new installation, check wiring. Hot and Load wires might be reversed.
Check that ON OFF trippers are both attached to yellow dial.
http://waterheatertimer.org/How-to-wire-WH40.html

If timer worked fine before, and started missing recently, then tripper pins probably worn out.
Trippers contact mechanical lever, and push lever on-and-off.
Trippers are softer metal and designed to wear out before lever.
If lever is worn out, timer needs to be replaced, but try new trippers first.
Buy trippers at Grainger
http://www.grainger.com/Grainger/INTERMATIC-Timer-Tripper-2E054?Pid=search
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

How WH40 timer works:
Clock motor rotates dial.
ON-OFF trippers on dial contact lever.
ON tripper pushes lever one direction.
OFF tripper pushes lever other direction.
Lever moves electrical contacts together, or pulls contacts apart.
When lever moves on-and-off, manual override lever also snaps back and forth with audible clicking sound.

Using q-tip, add touch of white grease to lever where trippers contact.

geno_3245_110.jpg

Nov 25, 2010 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

Replacement timer motor needed


If you have Intermatic timer, then clock motors are available for most hard-wire box-type timers. Most pool and spa timer modules are available or have same/similar replacements. If you have plug-in timer, including power pack or portable outdoor timer or indoor plug-in or in-wall timer, then no clock motors are available.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html

If you have Tork timer, then clock motor is available for 1100 series.
http://waterheatertimer.org/Tork-timers-and-manuals.html
If you have Paragon timer, clock motors will be hard to find
http://waterheatertimer.org/Paragon-timers-and-manuals.html
If you have other brands of timer, then clock motors are not available except Deihl, DIGI and Grasslin timer modules, but post brand and model number of timer so I can search my files.
http://waterheatertimer.org/Woods-timers-and-manuals.html

Sep 11, 2010 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

New Intermatic WH40 electric water heater timer for solar


make sure your line wire is on the correct connection seems to be connected to the off going contact. then the clockmotor runs only if timer is switched on. to be sur there is a diagram on electricsuppliesonline.com, search/shop by brand, intermatic. good luck

Dec 27, 2009 | Intermatic WH40 - Water Heater Time Switch...

1 Answer

Clock on Intermatic WH40 Timer Switch does not rotate


Timers are a waste of time . I would disconnect it and get rid of it. Water heaters nowadays are so energy efficient and the thermostats take care of when it heats and shuts off. Your timer might save you pennies a year!

Feb 27, 2009 | Intermatic WH40 - Water Heater Time Switch...

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