Question about Intermatic T104 24h 208-277v Mechanical Time Switch

1 Answer

Hello, I installed a T104 timer switch following the directions on the manual. I connected supply lines to terminals 1 & 3 and the load wires going to the pool motor on terminals 2 & 4. The clock motor doesn't run and when I flip the switch on the pool motor doesn't run. Here's the trouble shooting I've dome so far: I verified I have 115V coming in on terminal 1 and 115 V present on terminal 3, measuring from each seperate terminal to ground. No voltage is present on terminals 2 & 4 when the flip switch is off, 115V is present on both terminals 2 and 4 when the switch is turned on. I also verified I have the 115 V on each wire terminal on the motor when the switch is on and no voltage present when the switch is off. The pool motor is factory preset for 230 V and I verified that the transformer selector is actually turned to the 230V position. I'm baffled at this point, any ideas on what else to check?

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It doesn't sound like you are getting a true 230 volts to the timer. Measure from terminal 1 to terminal 3. You should read 230 volts. If you are getting 230 volts between 1 and 3, return the timer, it's defective. If you are not getting 230 between 1 and 3, then you'll have to have a look inside the electric panel to see what has been miswired. There should be a 2 pole breaker with a white and a black wire connected to it that goes out to the timer.

Posted on May 27, 2011

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  • greywolf6082 May 29, 2011

    As a futher follow up to what caused my exact problem, I'm using a GE sub panel to where my wiring for the pump is connected. I'm using a double pole circuit breaker. The desighn of the breaker panel allows the breaker to be either centered on the slot that is energized or placed in between 2 of these slots (which is neccessary to have to true 230Vs). I was measuering 115V on each of the wires but that was not giving me the 230V out to the timer box. Once I placed the breaker so it is in contact wiuth 2 of the panel slots, now I have 230V going to the timer. It's all working now!

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My T 104 R has power to Line 1 and line 3 but when switched on nothing on load 2 and load 4. What am I doing wrong.


More information is needed.
How is timer being 'switched on?'
Is this new timer installation? Or timer that worked previously and stopped working?
Open following links for wiring and troubleshoot, and then add a comment with actions taken so far including how you are testing Load terminals 2 and 4, and what voltage shows when testing across terminals 1 and 3.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html

Jul 23, 2011 | Intermatic T104 24h 208-277v Mechanical...

Tip

How to wire Intermatic T103 and T104 timers


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.
Comment by gotgeek2, posted on Jan 08, 2010ckuzkuz, I'm a licensed master electrician in 2 states with 30 years in the trade. I've installed a lot of Intermatic timers over the years. I wrote this tip because I saw that a lot of folks were having problems wiring them.

on Mar 07, 2010 | Garden

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 | Hardware & Accessories

1 Answer

What you mean put line to ground can this be done? could u explain what are those wires for?


1) No you don't put 'line' to ground in any application.
But people use the word 'line' to describe a cable or a wire.
So your question is not clear, or maybe an answer you got from someone is not clear.

2) Let's go over wiring for T104 timer.
You posted under T104 Intermatic 240V timer.

3) Electricians use the words 'Line' and 'Ground' to mean specific things:
Line wires are wires that come from breaker box and go to timer.
Load wires are wires that leave timer and go to Load (light, fan, motor, pump)
Ground wire is extra safety line that is bare copper or green insulated wire.

4) How to wire T104 240Volt timer:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

Line wires from circuit breaker connect to terminals 1 and 3.
Load wires going to Load (light, fan, motor, pump) connect to terminals 2 and 4
Bare ground wire connects to green ground screw.
Terminal A does not have any wire in typical 240V connection. So terminal A has no wire.

5) If your power is 120V, then T104 is not the right timer.
You might need T101 or T103 depending on what you are doing.
Add a comment if needed.

6) If you have a different timer than T104, add a comment with specific brand and number that shows inside timer door. I have wiring diagrams for most box-type timers.

Add a comment for more free help.
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.
Fixya is always less expensive than a service call.

Feb 01, 2011 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

Hi expert: I am installing intermatic P1353me digital pool or spa mechanism and having trouble to figure out how to do this heater Firemen Switch connection. My existing pool timer is T104 and there were...


1) Fireman's switch automatically turns off heater few minutes before turning off pump.
Not all pool timers have fireman's switch.
If old timer did not have it, then don't worry about it.
P1353 has wires marked for fireman's switch, so simply don't use them if you don't want to.
http://waterheatertimer.org/pdf/Intermatic-P1353-manual.pdf
page 21 of manual shows wiring for fireman's switch.

2) T104 and P1353 comparison
Difference 1: T104 turns OFF both hot wires, while P1353 turns Off 1 hot wire.
http://waterheatertimer.org/Compare-120-and-240.html
Difference 2: T104 controls 1 240V load with 1 time schedule, while P1353 controls 3 different 240V loads, each with different time schedule.
Check that wire(s) coming from breaker can handle all 3 loads.
http://waterheatertimer.org/Color-codewire.html

3) 240Volt T104 is wired as follows:
http://waterheatertimer.org/images/T-104-240-Volt-400.jpg
Hot1 from breaker connects to T104 terminal 1
Hot2 from breaker connects to T104 terminal 3
There is constant power on terminals 1 and 3, each terminal has 120V when combined makes the 240V circuit.
Load1 wire connects to T104 terminal 2
Load2 wire connects to T104 terminal 4
Terminals 2 and 4 have power whenever timer turns ON

4) Definition:
In electric wiring, Line means power from breaker, and Load means wire going to light,fan, motor, pump.

5) Converting T104 to P1353
http://waterheatertimer.org/images/P1353-timer-350.jpg
http://waterheatertimer.org/images/P1353-terminals-566.jpg
Hot1 from breaker connects to P1353 terminal 1
Hot2 from breaker connects to P1353 terminal 2
This will power timer electronics and timer clock and switches.

Jumper wire is placed from Hot1 at terminal 1 to each Line terminals 3 5 and 7.
This will put power at the switch, and when switch turns ON, then power will flow from Line wires to Load wires and then on to the Load.
Load 1 connects to terminal 4, Load 2 connects to terminal 6, Load 3 connects to terminal 8
To complete each 240V circuit, Hot2 is connected directly to each Load.

6) You say 'salt' system connects to terminals 1 and 3 on T104, then those wires are carrying constant 240V to that device. So Salt system connects to terminals 1 and 2 on P1353

7) Get a second opinion:
I frequently contact Intermatic for various problems.
P1353 is fairly new product, and manual is long, and I might not fully understand your problem or wiring.
Intermatic answers their email.
http://www.intermatic.com/customer%20service.aspx

Add a comment for more free help.
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.
Fixya is always less expensive than a service call.

Jan 28, 2011 | Intermatic Digital 3-Circuit Timer...

1 Answer

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


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.

Dec 26, 2010 | Intermatic T104 24h 208-277v Mechanical...

1 Answer

How do I wire an intermatic t-103 timer switch


The T-103 has a 120Volt clock motor

From there, the wiring can go two directions depending on your Load voltage (load is the fan, light or motor that timer turns on-off)

Here is a link that shows exact wiring:
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T103

When wiring the T-103, steps 1-2-3 are true for 120V or 240V installation:
1) A white Neutral wire is always connected to terminal A (Neutral wire connects to Neutral busbar in breaker box)
2) A black Hot wire is always connected to terminal 1 >> this hot wire can come from 120V or 240V breaker
3) Black wire going to Load (fan, light, motor) is always connected to terminal 2
The following step is true for 120V Load
4) if Load is 120V, then white wire from Load connects to terminal A
The following steps are true for 240V Load
5) Only the neutral wire connects to terminal A as described in (1
6) The second Black hot from breaker box (240V has 2 hot wires) connects to terminal 3
7) The second White going to Load connects to terminal 4

Here are 2 more links that show how 120V and 240V circuits are wired
http://waterheatertimer.org/See-inside-main-breaker-box.html
http://waterheatertimer.org/B220C.html

Oct 21, 2010 | Intermatic T103 Indoor 120-Volt 40-amp...

1 Answer

I installed a t 104 timer on my sons water heater with the wires from the panel to line terminals 1 and3 and the load to water heater to terminals 2 and 4. the ground wires to the ground screw i set the...


You have wired it correctly assuming this is a 230V water heater. The timer should have come with the motor connected to terminals 1 & 3. You should be able to see two small wires coming from the rear. These are the motor leads. Make sure they are on terminals 1 &3 also. Check for 230V on the 1 & 3 terminals with the load off just to be sure you didn't accidentally reverse the line and load. Check to be sure timer motor is running. GOOD LUCK!

Aug 02, 2010 | Intermatic T104-20 Indoor Hot Water Timer

2 Answers

Clock doesn't work


The wiring diagram for that timer is somewhat misleading. The 120 volt clock timer motor is connected internally to the "A" (neutral) terminal and the #3 terminal. The "A" (neutral) terminal is to the immediate left of the #1 terminal.
Here's how to do the wiring for your use, (assuming a 120 volt supply circuit and a 120 volt lighting or other load):
Connect the incoming power (line) black wire to terminal # 3. Connect the incoming (neutral) white wire to terminal "A".
Connect the outgoing (load) black wire to terminal # 4.
Connect the outgoing (neutral) white wire to terminal "A".

Mar 08, 2009 | Intermatic T103 Indoor 120-Volt 40-amp...

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