Intermatic T104 24h 208-277v Mechanical Time Switch Logo
Posted on Dec 26, 2010

How to wire a intermatic timer T104 240 v to a 120v?

1 Answer

A

Anonymous

T104 is 240volt timer.
Timer has terminals A 1 2 3 4
T-104 clock motor must receive 240Volts to operate.
Clock motor wires are white-colored and can be seen connected to terminals 1 and 3.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/images/Back-of-WH40-2b.jpg

There are two work-arounds for using T104 for 120V.

1) Diagram 1 showing how to change wiring:
http://waterheatertimer.org/images/T-104-control-120V-Load-500.jpg
Move 240V clock motor wires to terminal 1 and A.
Connect 240V Hot leads to terminals 1 and A. This will power the 240V clock motor
Hot wire going to 120V load connects to terminal 2. This wire will be turned on each time timer turns on, and 120Volts will power the 120V load.
To complete 120V circuit, neutral wire that comes from neutral busbar in breaker box connects to 120V load.

To control additional 120Volt circuit, run jumper wire from terminal 1 to terminal 3.
Connect Hot to second load to terminal 4.

2) Second method is to change T104 timer into T103 timer:
http://waterheatertimer.org/images/T-104-control-120V-Load-2-5.jpg
Replace T104 240V clock with identical 120V clock motor from Grainger
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK1?Pid=search
Neutral wires connect to terminal A.
Hot wire from Breaker connects to terminal 1
Hot going to Load connects to terminal 2

To control additional 120Volt circuit, run jumper wire from terminal 1 to terminal 3.
Connect Hot to second load to terminal 4.

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http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T102
http://waterheatertimer.org/How-to-replace-Intermatic-clock-motor.html

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Manuals for pool timers

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http://waterheatertimer.org/Intermatic-timers-and-manuals.html#pool
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http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

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No. You are doing something incorrect with the wiring, or programming, depending on timer.
Intermatic makes very good timers, and not the promo line found at Walmart.
Interrmatic also has a solid warranty, plus full line of repair parts.
I know every timer in the versatile Intermatic line, and can figure out what is going wrong.
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http://waterheatertimer.org/Intermatic-timers-and-manuals.html
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/Intermatic-trippers-and-parts.html

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http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

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http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

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