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

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Wiring a wh40 intermatic timer to a sears hot water heater

This heater has 3 wires at the tank blue, black and yellow the schematic that came with the tank is very vague i want to make sure i wire it correctly thanks rick

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  • Anonymous Jan 17, 2009

    My heater has 3 wires from the circuit breaker to the tank. Ground, black and white. Breaker is 30 AMP. The wiring instructions that came with the intermatic WH40 are virtually worthless. It's the weekend now and they closed.

  • redsox5904 Feb 03, 2009

    I HAD THE QUESTION ABOUT THE THREE WIRES AT THE NEW SEARS TANK BLUE BLACK AND YELLOW. AND I WIRED THE BLUE AND BLACK TOGETHER AND BROUGHT THAT BACK TO 2 ON THE BOX AND THE YELLOW TO 4 SEEMS TO BE WORKING FINE THANKS FOR YOUR HELP.

  • Ty Parcher
    Ty Parcher May 11, 2010

    How are the blank and white wires currently connected at the tank? Is the 30 amp breaker a 2 pole breaker?

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Shut off breaker to you water heater. STILL TEST FOR VOLTAGE BEFORE YOU TOUCH ANY WIRING. The 3 wire that go to you water heater disconnect them. You are going to install them to your WH 40 timer.
The wires that you disconnected will now go to terminals: Black to Terminal 1 & White To Terminal 3, The Ground copper wire will go to the ground terminal should be a green screw.
You will have to buy some 10/2 wiring to go from your timer to your water heater. You can buy it by the foot at Lowes. Figure how much you will need.
With the new 10/2 wire install the Black to terminal 2 & White To Terminal 4, the ground wire will go to the ground screw with the other ground wire.
Wiring that went to terminals 2 & 4 will be installed to you water heater, the same way when you disconnected them. Set your timer clock and your done. Turn breaker back on!


Posted on Jan 28, 2009

  • Ron Krysiewski Feb 04, 2009

    Well Done! TheePlumber

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The manual switch does not engage, found a wire spring in the box?


1) Copy following links:
http://waterheatertimer.org/images/WH-Off-pin-clip-washer-600.jpg
http://waterheatertimer.org/images/WH-lever-001-400.jpg
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html

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This might be considered V-shaped spring.
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3) Add comment and say what you discover, and attach photo

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1 Answer

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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
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1 Answer

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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

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1 Answer

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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.
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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

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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

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