Question about Intermatic T103 Indoor 120-Volt 40-amp Timer Switch-Double Pole/Single Thro

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How to wire.

I am replacing an old timer with the T103 unit. The wires coming out of the wall are as follows:
2 red, 1 white, 1 gray.
I can't tell what numbers to use on the T103.
Thanks.

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Intermatic T103P Timer (120V) Wiring Guidance


Copy following link for T103 timer wiring options:
The clock motor is 120Volts, but clock motor can be changed from WH1570 to WG1573, and this action changes 120V T103 into 208-277V T104 timer:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103

Jun 08, 2012 | Intermatic Timers

Tip

How to wire Intermatic T103 and T104 timers


These instructions are for USA residential wiring only.

VERY IMPORTANT: Understand that in US residential wiring the WHITE wire is _NOT_ ALWAYS_ the neutral wire. Additionally, prior to 1999 the National Electric Code (NEC) did not require that these white wires be re-identified with black tape or similar means when used for purposes other than neutral. The white wire is sometimes used as a hot, especially when wiring Intermatic T103 and T104 timers.

Also understand that the WHITE neutral wire and the bare (or green) equipment grounding wire are connected together ONLY at the main electric power panel and must _never_be connected together _again_. Once those two wires leave the main electric panel, the WHITE neutral wire must _always_ remain insulated from the bare or green equipment grounding wire. This is very important for safety considerations.

If your wiring is very old and does not have a bare equipment grounding conductor, you _must_ protect the circuit with a GFCI (Ground Fault Circuit Interupter). GFCI wiring is not difficult but is beyond the scope of this post.

DETERMINE WHAT CABLE YOU HAVE:
Usually one will find one of the three following scenarios for the incoming supply cables when wiring a T103 or T104 Intermatic timer:

1...A 120 volt cable with 3 wires: black, white, and bare. The black is LINE (hot), white is neutral and bare is equipment grounding. Black to white is 120 volts. This scenario can be used with the T103, but not the T104.

2...A 240 volt cable with 3 wires: black, white, and bare. The black is LINE(hot), the WHITE is LINE (HOT), and the bare is equipment grounding. Black to white is 240 volts. This scenario is used with the T104 ONLY.

3...A 120/240 volt cable with 4 wires: Black, red, white, and bare. The black and red are (LINE) hot, white is neutral and bare is equipment grounding. Black to red is 240 volts. Black to white is 120 volts. Red to white is 120 volts. This scenario can be used with either the T103 or the T104.

The only difference between the T103 and the T104 is the timer motor voltage rating. The T103 uses a 120 volt timer motor and the T104 uses a 240 volt timer motor. The T103 timer motor is connected to terminal "A" and terminal #3 during manufacturing. The T104 timer motor is connected to terminal #1 and terminal 3# at the factory.

Also, when connecting the bare or green wires to the "GR" terminal, it is best to wirenut the wires together with a pigtail, then connect the pigtail to the "GR" (GRound) terminal, WHICH IS THE GREEN SCREW ON THE LOWER PART OF THE CASE.

WIRING THE TIMER:
The wiring diagram for the T103 is here:
http://www.progressive-growth.com/wiring/T103.pdf
___________________________________________________________________
WIRING THE T103 USING AN INCOMING 120/240 VOLT CABLE WITH 4 WIRES (scenario #3):

Incoming (LINE) wires from 240 volt circuit breaker:
Connect the black (LINE)(hot) wire to terminal #1. Connect the red (LINE) (hot) wire to terminal #3. Connect the white (neutral in this case) wire to terminal "A".
Connect the bare equipment grounding wire to the "GR" terminal, which is the green screw on the case.

Outgoing wires to 240 volt load:
Connect one (hot) wire to terminal #2 and the other (hot) wire to terminal #4. The bare or green wire goes to the "GR" terminal.
___________________________________________________________________
WIRING THE T103 USING AN INCOMING _120_ VOLT CABLE WITH 3 WIRES (scenario #1):

Incoming wires from 120 volt breaker or source:
Black (LINE) to terminal #3. White (neutral) to terminal "A". Bare to the "GR" terminal.

Terminals #1 and #2 are NOT used in this case.

Outgoing wires to 120 volt load(s):
Black(hot) to terminal #4. White(neutral) to terminal "A". Bare to the "GR" terminal.

The wiring diagram for the T104 is here:
http://www.progressive-growth.com/wiring/T104.pdf
______________________________________________________________
WIRING THE T104 USING AN INCOMING 240 VOLT CABLE WITH 3 WIRES (scenario #2):

Incoming (LINE) wires from breaker:
Connect the black (LINE) (hot) wire to terminal #1. Connect the white (LINE) (hot in this case) to terminal #3. Connect the bare wire to the "GR" terminal.

The "A" terminal is _NOT_ used.

Outgoing wires to load:
Connect one (hot) wire to terminal #2 and the other (hot) wire to terminal #4. Connect the bare or green wire to terminal "GR".

The "A" terminal is _NOT_ used.
______________________________________________________________
WIRING THE T104 USING AN INCOMING 240 VOLT CABLE WITH 4 WIRES:
Same as above, except the white wire is not used. Just tape or wirenut it off.

on Dec 28, 2009 | Timers

1 Answer

I have had a T103 running my pool pump for the last several years. All of a sudden the timer would switch on but not off. It was like the dial did not have enough torque to force it to switch and would...


1) T103 is 120Volt timer that can control multiple loads and different voltages..
If new timer dial stops turning after the tripper passes, then wiring from circuit breaker is probably reversed with wiring going to pump.
Open following link to identify correct wiring:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103

2) Add a comment for specific help with wiring, and I will respond.
Give details of pump voltage, and description of each wire.

3) To fix old timer, Replace 3-watt, 120Volt WG1570 clock motor.
Open following link for illustrations showing how to replace clock motor:
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html#clock

4) 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.
Fixya is always less expensive than a service call.

Sep 05, 2011 | Intermatic T103 Indoor 120-Volt 40-amp...

1 Answer

I have Intermatic timer WG 1573 208/277V 60Hz 3W stamped on the case. I would like to chage this unit to a 110V timer system if possible. (In other words just be able to switch clock motors) If this is...


WG1573 is a 240 Volt clock motor for T100 series timers.
This means you have T-104 timer.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
Image shown on link above is T104R outdoor timer.
T104 indoor timer is the same except door does not have rubber gasket.
Terminals are labeled A 1 2 3 4
If this is not your timer, then add a comment.

Following instructions will convert T104 240V timer to T103 120V timer

Clock motor can be replace with identical 120V clock motor from Grainger
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK1?Pid=search

Timer mechanism snaps out and clock motor is located on back.
Remove clock motor with star screwdriver tip

Connect new clock motor wires to DIFFERENT terminals than before.
Old clock was connected to terminals 1 and 3
New 120V clock motor is connected to terminals A and 1

Wiring for 120V T103 is shown on link below.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103
White neutral wire must connect to terminal A
Black hot wire must connect to terminal 1

Dec 19, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

1 Answer

I have an Intermatic T103 DPST timer installed now (120v). The clock mechanism has failed. I bought Tork 1103 guts to replace it. The wiring is a bit different. Can u map for me which wires go to which...


T-103 has 120V clock motor with 5 terminals A 1 2 3 4
Tork 1101 has 120V clock motor with 4 terminals L 1 X 2

T103 is DPST and can control one-or-two 120Volt loads, or one-or-two 240Volt loads.
Tork 1101 is SPST can control one 120Volt load

Common ground between these timers one 120 Volt load
Changeover for one 120 Volt load:
White wires T103 terminal A go to Tork terminal X
Black wire T103 terminal 1 goes Tork terminals L and 1 (there is brass connector plate that connects L and 1 - if connector is missing, jumper between L and 1)
Black wire on T103 terminal 2 goes Tork terminal 2

If Load requirement is greater than T1101, Grainger sells T103 clock motor for $16
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK1?Pid=search
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

How to wire T103
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103
T1101 wiring manual
http://waterheatertimer.org/pdf/110111021103WIRING.pdf

Dec 02, 2010 | Intermatic T103 Indoor 120-Volt 40-amp...

1 Answer

I have a T103 that replaced a old Tork timer. my problem is i have 3 wires black,red white where do they go?


T103 has 120volt clock motor.
If your circuit is 240volt, then change T103 for T104.
Electricians test before hooking up wires.
Use ordinary tester.
Separate wires and turn on power.
Test each wire to bare ground wire.
Tester will light up on hot wire.
In absence of bare ground, test each wire against other wires or against grounded surface to isolate the hot wire.
Hot wire connects to terminal 1 on T103 timer.
Now test hot wire to other wires (exclude bare ground)
Tester lights up on Neutral wire.
Neutral wire connects to terminal A.
The last wire must go to Load, so connect this wire to terminal 2.
Bare ground wire connects to green ground screw.
Turn on power, click manual override to check if load turns on and off.
Lift and rotate yellow dial until current time lines up with silver pointer.
Put trippers on outer edge of dial at on-off times.
Off tripper are brass colored.
Each tripper is marked.
Minimum 1 hour on-off period.

Nov 30, 2010 | Intermatic T103 Indoor 120-Volt 40-amp...

2 Answers

I'm trying to install this for our outdoor Christmas lights. The wall switch box has 1 black, 1 white, and 1 bare (ground). Where do I connect the red "timer" wire from the timer unit? When I...


Single pole application, red wire is capped off.
http://waterheatertimer.org/ST01C-program.html#ST01C

That being said, you still have to connect Blue and Black wires correctly.
Switch has two wires, if you do not know which wire is which, follow instructions below.
Connect Blue and Black to either wire.
Turn on power.
Push ON-OFF button.
If lights work, then timer is wired correctly.
If lights don't work, then reverse Blue and Black.

Be sure outdoor bulb is working.
I have a long story about that, and tested every wire and breaker ... and bulb was burned out.

Nov 28, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

I having troble with my t103 timer to turn the lights on manualy i try to set the timer but for some reason doesn't work what can i do ???


T103 Intermatic timer has 120Volt clock motor and can control 120V or 240V Loads.
Wiring for timer is shown on following link:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103

Troubleshoot T103:
1) Manual override is working correctly, and it snaps crisp and clean, and Load turns on-and-off.
That means timer is basically good.

2) Next look to see if yellow dial is rotating.
If dial is not rotating, then 120Volt clock motor needs to be replaced.
Take photo of wiring and mark wires before starting.
Remove two white wires connected to screw terminals 1 and A.
Snap timer mechanism out of box, clock motor is on back of timer.
Use small star screwdriver to remove old clock motor.
Reattach white wires on terminals 1 and A, tighten screws very tight.
Reset current time: lift and rotate dial until current time lines up with silver pointer.
Grainger sells 125V clock motor:
http://www.grainger.com/Grainger/INTERMATIC-Time-Clock-Motor-1PNK1?Pid=search

3) If dial is rotating, but gets stuck at certain times, or runs slow, then replace clock motor.

4) If dial is rotating, and trippers are attached to dial, but timer does not turn ON, then trippers are worn down and need to be replaced.
Grainger sells the T103 trippers
http://www.grainger.com/Grainger/INTERMATIC-Timer-Tripper-2E054?Pid=search

5) How Intermatic mechanical timers work:
Dial with ON-OFF trippers is rotated by clock motor.
Trippers on dial contact ON-OFF lever.
ON tripper pushes lever one direction.
OFF tripper pushes lever opposite direction.
Lever moves electrical contacts on back of timer that turn Load ON-OFF.
Manual override lever clicks back and forth with each ON-OFF action.

geno_3245_85.jpg

Nov 20, 2010 | Intermatic T103 Indoor 120-Volt 40-amp...

1 Answer

Am replacing an old wall timer with a GE Smart Digital Timer. The old timer had two black wires connected to two black wires from the wall. The new timer however has red, black, white and green wires. I...


I've tested these timers.
Here's what to do:
1) Connect green to bare copper
2) Switch has 2 wires. For now, connect these two wires to timer-black and timer-red. Choose either one.
3) In back of wall box are white neutral wires twisted together and covered with wire nut. Timer-white wire connects to these white neutral wires. This action gives power to time clock.
4) If wall box does not have white neutrals described above, then connect timer-white to bare ground wire. Bare ground connects to neutral busbar in breaker box.
5) Turn on power and click manual override button or switch. If lights turn on, timer is wired correctly. If lights do not turn on, then reverse timer-red and timer-black wires.

Nov 16, 2010 | GE 60minute Automatic ShutOff Timer Switch...

1 Answer

T103 clock not working


Please read all of this post. You may burn up the 120 volt T103 timer motor is you are not careful.

The statement: "I have 120v board with 120 constant and 240 timed" is not very clear to me as to what you mean.

In US residential wiring, the white wire is not always the "neutral;" The white wire is sometimes used for 240 volt circuits.

We cannot tell you how to wire your timer unless we know _exactly_ what you have.

If your incoming supply cable (from the breaker box) has 3 wires (black, white, and bare), there are two scenarios:

1...If the voltage from black (hot) to white (ALSO hot in this case) is 240 volts, and you have only 3 wires (black, white, and bare), then the T103 is the _wrong_ timer if you are trying to control a 240 volt load. You should use a T104 timer.

The T104 uses a 240 volt timer motor and the T103 uses a 120 volt timer motor.

2...If the voltage between black and white is 120 volts, then you will only be able to control 120 volt loads; then the incoming black supply wire is connected to terminal 3 and the white (neutral) wire is connected to the "A" terminal. The bare equipment grounding wire is then connected to the "GR" terminal.

To show the difference, if you are trying to control a 240 volt load, to use a T103 and wire it _correctly_, you would need to have a incoming supply cable with a total of 4 wires (black, red, white (neutral), and bare) Black to red would be 240 volts. Black to white would be 120 volts. Red to white would be 120 volts.
The connections would be as follows:
White (neutral in this case) to the "A" terminal
Black to terminal 1
Red to terminal 3
The 240 volt load would then connect to terminals 2 and 4
Both the bare equipment grounding wires are connected to the "GR" terminal.

Since you did not mention a red wire, I can only ASSUME that this is not the case.

Sorry, we can't tell you how to wire this timer based upon assumptions.

So, what do you have?


Dec 23, 2009 | Intermatic T103 Indoor 120-Volt 40-amp...

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