Question about Intermatic INC ET104C 24 HOUR ELECTRONIC TIME SWITCH 30 amp

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How to program a Intermatic Et104c Electronic 24 Hour Timer 120v 277v

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Posted on Jan 02, 2017

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SOURCE: how to wire an intermatic et104c for 120v

Copy following link for ET104C 120volt wiring diagrams.
Don't forget ET104C arrives with default voltage set for 240Volt
http://waterheatertimer.org/How-to-wire-Intermatic-ET-series-timer.html

Posted on Aug 13, 2012

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SOURCE: Im installing an Intermatic ET104C

Line voltage is not known.
240Volts has 2 hot wires and no neutral wire.
If both 10-2 wires test hot to ground, then you are working with 240V and no neutral is present.
http://waterheatertimer.org/240-v-water-heater-circuit.html#120-240

ET104C timer is shipped default setting for 240Volts.
ET104C can be wired many different ways.
Terminals 1 and 2 are for running the timer operation. So power lines connect to terminals 1 and 2.
Terminals 3 4 5 6 are dry. They have no power when wires are connected to terminals 1 and 2.
Typical 240v ET104C wiring shows next image.
http://waterheatertimer.org/images/ET-water-heater-circuit2-40.jpg

Posted on Jun 19, 2011

Testimonial: "couldnt have explained any better or clearer than it was. The diagrams were particularly helpful and your help is appreciated immensely. -JMW"

SOURCE: intermatic digital lamp timer dt300.

There is no repair for defective timer.
The DT300 is sold under at least 3 different brands and product numbers, and each manual shows identical steps for choosing 12H and 24H format.

The manual says to press and hold CLOCK button until display shows 24H. Then press HOUR button to change to 12 hour format.
I am guessing this step cannot be done if timer has programming in memory, so timer has to be reset first by pushing in reset button for a few moments.

Open following links to identify timer and download manual:
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#DT300
http://waterheatertimer.org/pdf/DT300-series-manual.pdf

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Posted on Sep 14, 2011

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How to wire an intermatic et104c for 120v


Copy following link for ET104C 120volt wiring diagrams.
Don't forget ET104C arrives with default voltage set for 240Volt
http://waterheatertimer.org/How-to-wire-Intermatic-ET-series-timer.html

Aug 11, 2012 | Intermatic INC ET104C 24 HOUR ELECTRONIC...

1 Answer

Do not know how to open door of the intermatic wall time switch Do not know howto set timer--I want timer to go on at 7 PM and turn off at 7 AM


Question posted under ET104 timer.
This timer arrives with default voltage set for 240Volts.
Move voltage selector to select 120Volts as per instruction manual:
http://waterheatertimer.org/pdf/Intermatic-et104c.pdf
You can add a comment any time for more specific help with this timer.

1) If this is a plastic enclosure, then push inward to unlatch enclosure door.
See illustration: http://waterheatertimer.org/images/IMG_9431-Open-enclosure-400.jpg

2) Model number of timer and wiring diagram and programming appear on inside of timer door.
Add a comment with timer number if different from below.

3) How to program ET104 timer:
http://waterheatertimer.org/pdf/How-to-program-Intermatic-ET104-timer.pdf
-Read instructions.
-Set current time.
-Set program 1 for 7pm
-Set program 2 for 7am
-Not necessary to use programs 3 4 5 6 7 8

4) More resources
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#ET100

Sep 22, 2011 | Intermatic INC ET104CPD82 24 HOUR...

1 Answer

Im installing an Intermatic ET104C timer and have in the past installed a few WH40 Intermatic timers with no problem but ive always had 4wire supply or 10/3. This time its a 3wire supply or 10/2 w/ground...


Line voltage is not known.
240Volts has 2 hot wires and no neutral wire.
If both 10-2 wires test hot to ground, then you are working with 240V and no neutral is present.
http://waterheatertimer.org/240-v-water-heater-circuit.html#120-240

ET104C timer is shipped default setting for 240Volts.
ET104C can be wired many different ways.
Terminals 1 and 2 are for running the timer operation. So power lines connect to terminals 1 and 2.
Terminals 3 4 5 6 are dry. They have no power when wires are connected to terminals 1 and 2.
Typical 240v ET104C wiring shows next image.
http://waterheatertimer.org/images/ET-water-heater-circuit2-40.jpg

Jun 18, 2011 | Intermatic INC ET104C 24 HOUR ELECTRONIC...

1 Answer

What configuration do the output power wires look like. Do I connect to 3 and 4 , slots etc. What is meant by "load" in the instructions?


1) You posted under ET104C DPST (double pole single throw) 24-hour 4-ON and 4-OFF per-day selectable-voltage timer
DPST means that timer will turn off two wires going to 240Volt Load or two separate 120V Loads

Open following link for example Intermatic ET series wiring diagrams and manual:
http://waterheatertimer.org/How-to-wire-Intermatic-ET-series-timer.html

2) Load means whatever electrical device is controlled by timer. ie fan, light, motor, pump, alarm-bell, water-heater, bowling-ball-machine etc.
Line means cable coming from breaker box.

3) If you have a different timer, then add a comment with photo of inside of timer door for possible identification and complete answer.
http://www.fixya.com/support/r6568559-post_photograph_fixya_questions_answers

4) Selectable voltage means you have to choose voltage.
Timer come preset for 240Volts.
If you have 120V 208V or 277V, then follow the vague instructions shown on page 2 #2 of manual.

5) Do not apply voltage to this timer before matching selectable voltage setting with circuit breaker voltage.

6) ET104C has 6 terminals and can be wired many different ways depending on Load voltage, etc.
This timer can do a lot of different things.
If you have ET102C with 4 terminals, then add a comment and clearly explain voltage, color of wires, and what breaker you have and what Load you are controlling for best answer.

7) ASSume you have 240Volt cable coming from breaker box, and that you are controlling a single 240Volt Load like a water heater or pool pump.

240Volt cable from breaker will have 2 hot wires called Line 1 and Line 2
Line 1 black wire will attach to both terminal 1 and terminal 3 (use a jumper wire between terminal 1 and 3)
Line 2 red or white wire will attach to both terminal 2 and terminal 5 (use a jumper wire between terminal 2 and 5)
Your 240Volt Load will also have 2 wires.
Load 1 black wire will attach to terminal 4
Load 2 red or white wire will attach to terminal 6

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Apr 23, 2011 | Intermatic INC ET104C 24 HOUR ELECTRONIC...

1 Answer

I have an ET104CP and cannot read the instructions, therefore I need an instruction manual or the step to program one-(1) event both on and off.


Thank you for including model number of product.

-One confusing part of ET104CP 24-hour timer is that event1 is ON and event2 is OFF and event3 is ON, and event4 is OFF etc.
-Another confusing part is that on-line manual says: "Refer to programming instructions on time switch door."
-So if timer door has gotten wet or paper has aged, then key instructions are missing unless you have new timer in front of you.
-Last confusing part can be selector switches.
To program timer, selectors are set to Manual and RUN
To operate timer programs, selectors are set to AUTO and RUN

1) Manual for product appears below:
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/et104c%20-%20english.ashx

2) According to manual, you put timer in Manual and RUN and then press and hold reset button, and then event1 will display.
Guessing at this point, press hour and minute button to set event1 ON
Press event button again to display event2, and then press hour and minute
Make sure events do not conflict with each other or timer will not operate

3) If instructions in #2 above are not correct, then add a comment and write out what is printed on your timer door, I can work alongside you to help decipher

4) If timer instructions on door panel have gotten wet and are unreadable, then contact Intermatic directly.
http://www.intermatic.com/customer%20service.aspx

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Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
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Feb 15, 2011 | Intermatic INC ET104CPD82 24 HOUR...

1 Answer

Looking for a timer to turn a 120volt 2amp water pump on for 1min 2 times aday that will last for more than 3 years please help


1) You need 120V timer to control 2 amp water pump.
V x A = watts so 120V x 2amp = 240 watt
754 watts per HP divided by 240W = 1/3 HP horsepower.

2) To get 1 minute time periods, you need electronic timer.
Most electronic timers have minimum 1 minute set time.
Same schedule each day, you can use 356-day, 7-day or 24-hour electronic timer.

3) To have electronic timer last longer than 3 years you need a clean circuit and expensive timer.
Use circuit analyzer to check circuit. Hire electrician to check circuit and replace pump if necessary to make sure timer will last as long as possible.

4) Intermatic ET70115C should last for many years. Battery is replaced every 8 years.
http://www.intermatic.com/products/timers/electronic%20time%20switches/next%20generation%20time%20switches.aspx
ET70115C $379
http://www.1000bulbs.com/product/3391/ELEC-ET70115C.html

5) You posted under EH10 water heater timer, which is inexpensive water heater timer rated for 1HP. You can't expect inexpensive timer to last as long when using a motor, although 1/3 HP is lightweight motor.

6) You can buy five EH10's for same price as one ET70115C.

7) List of ordinary electronic timers, each with slightly different features
Intermatic EH10 $73
http://www.amazon.com/Intermatic-EH10-Electronic-Heater-Indoor/dp/B000GHIPOA
Intermatic ET1105C $96
http://www.amazon.com/Intermatic-ET1105C-Hour-Electronic-Switch/dp/B002X1FYWI
Intermatic ET101 $101
http://www.westsidewholesale.com/24-hour-programmable-electronic-timer.html
Tork EW100B $177
http://www.1000bulbs.com/product/8434/TORK-EW101B.html
Sylvania SA300 $72
http://www.amazon.com/Sylvania-SA300-120-Volt-Single-Pole-Industrial/dp/B000KKNEO4

8) See wiring diagrams and manuals for some of the timers listed above:
http://waterheatertimer.org/Boxtype.html

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Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 31, 2011 | Intermatic 7 Day Electronic Timer Eh10...

1 Answer

Dear sir I am trying to connect Model Et104, my questions are as follows: I am having a problem connectiing your system. Both power source 110v and 220 volts have to connect to your system???? If my...


Fixya answers questions about other people's products.

I specialize in timers.
Intermatic is changing their product line
I suggest you download the manual:
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/et104c%20-%20english.ashx

The manual is generic across all the ET100 series products.
The manual does not describe individual models.
The instructions are on the timer door.
Look for the clock voltage.
The clock voltage tells the story of your timer model.

NOW lets say your clock voltage is 120V.
I believe you suspect the clock voltage is 120V.

To make this timer work with your 240V cable, there are 2 methods

Method 1) To meet code, run a white wire from nearby 120V receptacle.
This is a Neutral wire.
Connect the Neutral to terminal 1
Connect one leg from the 240V cable (1 of the 240V wires) to terminal 2 and that will complete the 120V circuit and the clock will run.
This is true because each leg of a 240V circuit is actually 120V, and only when the two legs are combined do they produce the 240V circuit

Method 2) Connect bare ground wire to terminal 1 and to grounding screw
The bare wire connects to the Neutral busbar in the main breaker box, so it will complete the 120V circuit just as described above.
This is not code, but your clock will operate.
Then connect one leg from the 240V cable to the terminal 2

IF your clock is 240 V, then connect both legs of the 240V cable to terminals 1 and 2

7:59 CST Add a comment if you need more assistance, I will be here later this evening

Nov 06, 2010 | Intermatic INC ET104C 24 HOUR ELECTRONIC...

2 Answers

Need instructions to program Intermatic Model #E140C wall switch timer.


Do you mean Intermatic E104C box-type timer? Intermatic does not make E140C

Manual says "refer to programming instructions on time switch door"
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/et104c%20-%20english.ashx

Manual says timer has 8 events per 24-hour day ... 4 'on' events and 4 'off' events. Normal operations, selectors are set to AUTO and RUN.

Using sketchy info from manual about programming:
Set sliders to MANUAL & TIME/SET
Press EVENT for event 1 ... set hour and minute using HOUR & MIN buttons ... this will be 'on' time
Press EVENT for event 2 ... set hour and minute ... this will be 'off' time
Set all 8 events ... 4 'on' and 4 'off'
Move sliders to AUTO & RUN for timer operation

Sep 15, 2010 | Hardware & Accessories

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