How To Install an Intermatic T104 Timer

WRITTEN BY:  Inyo Pools

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Running pool equipment 24 hours is usually unnecessary and expensive. Installing an Intermatic T104 timer is a great way to dramatically reduce run time and energy costs. The following steps will provide a guide on how to install the T104 timer. Note, timers vary with supply voltage. A T104 timer is used for 230V supply voltage. If you are using 115V supply voltage, you will need a T101 timer. The installation steps are the same for either.

Step by Step

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Step 1

Open up the T104 box and remove the black plastic insulator. The insulator is held in place by one screw.

Step 2

Locate an area on the wall near the pool equipment for the timer box. Locate the timer out of reach of the sprinklers or drainage spouts.

Step 3

Mark the locations for the three mounting screws. One is located on top of the timer box and two are located inside the timer box towards the bottom.

Step 4

Drill three holes where the mounting screws will be installed. Note: We used a special 3/16" carbide drill bit to drill into the concrete.

Step 5

Install screws (or other hardware appropriate for the mounting surface) through the mounting holes of the Intermatic T104 timer box. Note: We used 1/4" x 1-1/4" hex head concrete anchors. Hex head anchors are recommended for better traction when installing into concrete.

Step 6

Remove two of the knockouts from the timer box. One knockout will lead to the breaker panel and the other will lead to the pool equipment.

Step 7

Thread a 1/2" mpt terminal adapter into the knockouts on the timer box.

Step 8

Your next step is to wire the power from the breaker panel to the pool timer. When wiring, be sure to follow local and NEC/CEC electrical codes. CONTACT A PROFESSIONAL ELECTRICTIAN IF YOU ARE UNCOMFORTABLE WORKING WITH POWER. Incorrect wiring can cause dangerous shocks and may void your warranty.

Step 9

TURN OFF THE POWER AT THE BREAKER PANEL.

Step 10

Measure the distance from the breaker panel to the timer box. Cut a piece of 1/2" electrical conduit to match this distance.

Step 11

Feed the three cables from the breaker panel through the conduit and into the Intermatic timer box.

Step 12

Press the conduit into the terminal adapter.

Step 13

Connect the ground wire to the green screw located on the Intermatic timer mechanism. The ground wire will be green or exposed copper.

Step 14

Locate the two input power cables that come from the breaker. Connect one to terminal 1 and the other to terminal 3. Terminals 1 and 3 are called the "Lines". Note: it does not matter what color goes to 1 or 3. It only matters that one cable is on 1 and the other is on 3.

Step 15

The next steps will involve connecting the equipment to the timer.

Step 16

Measure the distance from the equipment to the timer box. Cut a piece of 1/2" electrical conduit to match this distance.

Step 17

Feed the three cables from the equipment through the conduit and into the Intermatic timer box.

Step 18

Press the conduit into the terminal adapter.

Step 19

Connect the ground wire to the green screw located on the Intermatic timer mechanism. The ground wire will be green or exposed copper.

Step 20

Connect the cables running from the equipment to terminals 2 and 4. One cable will go to teminal 2 and the other to terminal 4. Terminals 2 and 4 are called the "Loads". The Loads are what the timer controls. Note: it does not matter what color goes to 2 or 4.

Step 21

Place the black plastic insulator back into the box and tighten the screw to keep it in place.

Step 22

The next steps will involve programming the timer.

Step 23

There is a silver Time Pointer on the Clock-Dial. This Time Pointer will point directly to the current time.

Step 24

To set the time, pull the Intermatic Clock-Dial outward. Turn the dial in either direction and align the exact time of day on the Clock-Dial to the Time Pointer. The picture displays the timer set to 12:00 pm.

Step 25

The next steps will demonstrate how to set the trippers. The trippers will determine when the equipment will turn on and off.

Step 26

Locate the "On" tripper. The "On" tripper is typically green and will be labeled "On".

Step 27

To set the "On" tripper, hold the tripper against the desired time and tighten the tripper screw firmly. The picture displays the "On" tripper set at 8:00 am.

Step 28

Locate the "Off" tripper. The "Off" tripper is typically gold and will be labeled "Off".

Step 29

To set the "Off" tripper, hold the tripper against the desired time and tighten the tripper screw firmly. The picture displays the "Off" tripper set at 4:00 pm.

Step 30

Turn on the the power at the breaker panel.

Step 31

The Intermatic T104 Series Timer should now be successfully installed. The yellow clock dial should be spinning and the equipment should turn on and off at the set time. Close the timer door and enjoy the energy savings with using a timer.

Comments

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(1 to 40 of 79)

Inyopools  Posted: 08/30/2017 10:52 AM  Inyo Product Specialist

Anonymous (T104 trippers) - No, it does not matter where the manual switch is set. When the yellow dial rotates, the ON tripper will contact the switch at the time you set and flip it to ON (or leave it at ON). When the dial rotates to your OFF position, the OFF tripper will flip the switch to OFF. Make sure you have both trippers installed and that one is an ON tripper and the other is an OFF tripper. One is longer than the other.


Anonymous  Posted: 08/29/2017 12:17 PM 

You have a t104 are does it matter what the manual switch is set to will it still turn on and off if the timer is set to run at 10 a.m. and shut off at 3 p.m should it be in the off position all the time for the on position all the time would be leaving for several months but we wanted to run everyday and it doesn't seem to be doing that thank you.


Inyopools  Posted: 08/05/2017 14:03 PM  Inyo Product Specialist

Frustrated - I assume you replaced the whole timer and not just the motor or the timer mechanism. Check that you have the correct timer for your voltage. T104 for 220V. T101 for 115V. Then check that the white motor wires are connected to terminals 1 and 3. Also, check that the two supply wires from the breaker box are attached to terminals 1 and 3 and that the grounding wire from the box is attached to the grounding lug on the timer. Turn the manual timer switch off. Take the "ON" and "OFF" trippers off the dial so they aren't a factor. The motor should run and the yellow dial should advance in time.


Frustrated  Posted: 08/02/2017 20:50 PM 

My pool timer was 17 years old. I just had my pool resurfaced and shortly afterwards the timer quit working. If you looked into the peep hole you could see the gears turning but the clock dial didn't move (it was engaged, checked that). I purchased a new timer, installed it and the gears didn't even turn. Returned that one installed another new one. This one I could see the gears turning so I walked away to give the clock dial time to move. I came back later to find the breaker tripped at the box and also tripped the breaker at the main panel in the house. I reset the breakers and now the gears are no longer turning. What now?


Inyopools  Posted: 07/07/2017 11:07 AM  Inyo Product Specialist

Anonymous (timer ground) - If your timer doesn't have a ground wire coming into it from the breaker box, you should rewire that circuit to include a ground wire.


Anonymous  Posted: 07/04/2017 16:46 PM 

Trying to replace a timer, but there was no ground wire on the one being replaced. What's a solution?


Inyopools  Posted: 07/04/2017 13:54 PM  Inyo Product Specialist

Stephen - Thank you for your feedback. You are correct. 12 gauge wire could not be used on a heater's 60 amp circuit. It would be more like 6 gauge. However, this timer installation is intended for a pump, not a heater. I do not see where we say that a 12 gauge wire is required to connect the timer to a heater. We could probably be clearer on how this timer is going to be used.


Stephen  Posted: 06/30/2017 17:36 PM 

It shows that 12 gauge wire is used to connect the timer to the heater. How can that be when at 60 amps that wire would not suffice? I'm confused. I have a 125 BTU Hayward heat pump and was told to use an Intermatic Timer 220 Volt Plastic Enclosure - T104P3. Does anyone have the same combo? If so, how did you wire it?
Thanks


JohnS  Posted: 05/30/2017 12:23 PM 

i have 2 20amp circuits that are wired to box and one wire from panel shows 0 volts when grounded (neutral), the other 2 show 110.

want it to control a new pump (set at 115) via timer and manual override.

a GFI outlet a on/off switch to swimming pool light

and (auto( temperature controlled /on/off switch that controls solar heating to pool.

the intermatic switch is a T104M model.

the A post is connected to the neutral, the other two wires to the line (which is 1 and 3 which have the associated clock wires), the pump is connected to the 2 and 4 post.

clock runs correctly but the electric motor / pump does not work when manual switch is ON. haven't bothered to test to see if timer will start pump.

without the pump wires connected, a voltage tester shows 0 when manual switch is off and 110 when on.

with the wires connected a voltage tester shows 0 when manual switch is off and goes off the chart when manual is set on.

1st, am I using the correct switch? if not, which one?

any ideas on how to fix or test?



Inyopools  Posted: 05/15/2017 0:58 AM  Inyo Product Specialist

chipper - Make sure the white wires from the clock motor are attached to terminals 1 and 3 and not 2 and 4. If they are wired correctly, I'd replace the clock mechanism. See our guide on "How to Replace an Intermatic T104 Mechanism".


chipper  Posted: 05/12/2017 18:01 PM 

on trip is tight. the dial stops turning as soon as the timer shuts the pool down


Inyopools  Posted: 05/11/2017 23:28 PM  Inyo Product Specialist

chipper - The "ON" and "OFF" trippers are different. See step 28. Make sure you have placed an "ON" tripper where you want the pump to be turned on. Also, make sure the tripper is on tight so it flips the switch on. If this doesn't correct the problem, you may need to replace the timer mechanism.


chipper  Posted: 05/10/2017 20:55 PM 

timer will turn off pool, but not start it. where should the manual switch be set


Inyopools  Posted: 02/17/2017 10:12 AM  Inyo Product Specialist

wire gauge - The selection of wire gauge between the timer and pump depends on three factors: HP, supply voltage, and distance. An 115V pump will use twice the amperage as a 230V pump. If the distance to your pump is less than 50 feet, for a 1HP or less pump, on 230V you would need 14 gauge wire - for 115V you would need 12 gauge wire. If the distance to the pump is between 50 feet and 100 feet and you have a 1 HP pump, 230V requires 12 gauge, 115V requires 8 gauge. For a 3/4 HP pump, 230V requires 12 gauge, 115V requires 10 gauge.


Anonymous  Posted: 02/16/2017 23:09 PM 

What gauge/type wire should be used from timer to pool pump?


Inyopools  Posted: 12/12/2016 12:20 PM  Inyo Product Specialist

Timer wiring - Are these two additional wires than what is shown in this guide and where are they. I would have to know more about the make and model of this timer to help you.


Anonymous  Posted: 12/11/2016 13:15 PM 

The new timer has two black wires that the old timer doesn't have. Where do they go?


Inyopools  Posted: 11/22/2016 16:53 PM  Inyo Product Specialist

Tino - I'm assuming you are trying to install a timer for a 220V system since you have two hot wires coming into the timer. And I'm not sure which timer mechanism you have but the T101M mechanism has the same 5 number of terminals as the T104M mechanism. A major difference between the T101 and T104 timers that you have to consider is the timer motor. The T104 runs on 220V; the T101 runs on 110V.


tino  Posted: 11/21/2016 12:33 PM 

I have the 101 series and I have two hot lines coming in and the timer only has tree terminals instead of five is there a way to ether buy extra terminals or there is deferent wiring options.


Inyopools  Posted: 08/26/2016 10:37 AM  Inyo Product Specialist

mrjaydeeone - You should have a label inside the cover of the timer box that identifies your timer as a T101 for 110V, or a T104 for 220V. If that label is gone, take the timer mechanism out and look at the back of the timer motor. It will be labeled 110V or 220V specifying what voltage it uses. If your clock is not moving, it is likely that the motor has failed and you would only have to replace the motor. See our guide on "How To Replace an Intermatic T104 Clock Motor". Or if the whole mechanism has failed due to jammed gears, see our guide on "How to Replace an Intermatic T104 Mechanism".


mrjaydeeone  Posted: 08/26/2016 7:36 AM 

I just purchased a house with an AG Pool. And it has an intermatic timer for the pool pump and filter. The timer is not working. The close does not move. How can I determine if I have a 110 volt or 220 volt? on the plate for the timer it is stamped D10694. Thank you
Jason


Inyopools  Posted: 08/17/2016 8:50 AM  Inyo Product Specialist

T104 timer wiring - When wiring a T104 Timer for 220V, the white wire in a 3 wire plus ground cable is not used. It is generally capped off inside the timer with a wing nut.


Anonymous  Posted: 08/16/2016 20:00 PM 

Where does the common or White wire get connected to? Usually a 220V
has three wires Black,Red White and ground (Green / Bare )


Inyopools  Posted: 08/10/2016 10:28 AM  Inyo Product Specialist

T104M replacement - It not clear why you have 4 wires coming from the panel. For a 220V installation, you normally have one hot red and one hot black coming from the panel and attaching to terminals 1 and 2. A green ground would also be attached to the grounding lug. Power for the clock would come off of terminals 1 and 3. See our guide on "How to Replace an Intermatic T104 Mechanism" for more information.


Anonymous  Posted: 08/09/2016 15:48 PM 

Question: I am replacing a T104M that has stopped working (with another T104M) and there are four wires coming from the panel(two black and two red). For the existing (broken) timer, the two black wires from the panel are connected to the two white wires from the clock motor, and the two red wires from the panel are connected to terminals 1 and 3. [There are also two red wires that connect to the equipment, which are connected to terminals 2 and 4 as you would expect.

Should I (a) just copy this setup for the new timer (i.e. disconnect the white clock motor wires from terminals 1 and 3 and connect them directly to the two black wires from the panel, and connect the panel red wires to terminals 1 and 3), or (b) leave the clock motor wires connected to terminals 1 and 3 and also connect the black and red panel wires to terminals 1 and 3 (and if so,should I connect one red and one black to each of terminals 1 and 3), or (c) something else...?

Thanks!


Inyopools  Posted: 07/05/2016 10:26 AM  Inyo Product Specialist

Jboy - The A post is only used in very special circumstances and is generally not wired to anything. Check your wiring against this guide again to see if you missed something.


Jboy  Posted: 07/01/2016 10:42 AM 

question What should the A post be connected to ? In the wiring diagram is says neutral .. when I connect it to the white neutral bar in the fuse box it trips the gfi same if I connect it to the ground bar ... this is a double pole switch with GFI.
When not connected to anything the timer is not working??


Inyopools  Posted: 03/26/2016 11:58 AM  Inyo Product Specialist

DavidJ - The easiest way to "disable" the timer is to pull off the "ON" and "OFF" trippers. See Steps 26-29 of this guide for instructions on putting the trippers on (or taking them off). The motor on the timer will still run, but it won't engage the on/off switch.


DavidJ  Posted: 03/24/2016 18:35 PM 

Just bought a house that has a T104 on the hot water heater. How do I disable the timer so that the heater functions normally as it would without the timer?


Inyopools  Posted: 03/19/2016 9:45 AM  Inyo Product Specialist

Dave - Sound good to me. Check the wiring again. On a T104, the inputs are on terminals 1 & 3 and the outputs on 2 & 4. Make sure that the circuit breaker to your timer is large enough to handle both functions.


Dave  Posted: 03/18/2016 12:11 PM 

Hi guys, I recently bought a Pentair vs super flo pump w/timer from you and am ready to install. I have an Intermatic T104 timer that is also used to control on roof solar heating. Since the new pump has it's own digital timer can/should I wire this to the 'line' terminals (1&2) so that it has continuous power? I plan on keeping the solar on 'load' terminals (3&4) to control with T104 timer.

As usual, thanks for all the help!


Inyopools  Posted: 03/14/2016 14:14 PM  Inyo Product Specialist

Doug S - There is a set of contacts on the backside of your timer that may not be closing properly. Look at our guide on "How to Replace an Intermatic T104 Mechanism" to see how to remove this mechanism and see the contacts. You do not have to remove the wires to see behind the mechanism. Make sure the power is OFF. When you manually switch the timer on, you should see both of these contacts close. If they do not, I would replace the mechanism. If they close properly, recheck your wiring.


Doug S  Posted: 03/12/2016 10:48 AM 

I have it wired correctly but I can not manually shut the pump off with the on/off switch nor does it cut off when it reached the clock trippers. Any suggestions


Inyopools  Posted: 03/07/2016 9:45 AM  Inyo Product Specialist

George - The knockout plates are cut out most of the way around and are only held in by thin uncut tabs. Force a small screwdriver into the cut out area and pry the plate out. The uncut tabs will break off.


George  Posted: 03/05/2016 16:39 PM 

How do I open the knockout holes on the timer? A procedure please!

George


Inyopools  Posted: 02/29/2016 14:49 PM  Inyo Product Specialist

Captain - I have a call in to confirm these answers with the Intermatic rep but here is my understanding now:
1- According to the fine print in the wiring figure, the "A" connector is used with 277/480 volts not generally available to a typical resident.
2- If you have 220V coming in on the black and red wires and the green is ground, the forth supply white wire is extra and should be capped off.
3- This timer is limited to a total of 40 amps so would not handle a 20 amp pump and a 50 amp heater. I think most users rely on the "no flow" switch within the heater to shut off the heater when the pump is turned off.


Captain  Posted: 02/26/2016 22:20 PM 

1.) What is the "A" connection for on the T-104R?

2.) Besides Line #1 (Black), Line #2 (red) and ground (copper), I do have a nuetral (white)wire that is not connected to anything in the timer box. Do I connect it to anything? or do I just cap it off?

3.) Can I wire this timer (T-104R) to start both my pump and heater at the same time? Both are 220VAC, The pump is on a 20amp breaker and the heater is on a 50amp breaker.


Patridr  Posted: 02/10/2016 18:44 PM 

Read your directions to install a new T104R Timer. I'm a guy who hates dealing with anything electrical and any more than three wires baffles me. You made it easy and SAFE... Thanks a lot, David


Inyoopools  Posted: 10/09/2015 10:05 AM 

dj- Unfortunately, we do not have that information. I suggest calling Intermatic direct and seeing if they can provide a wiring diagram. Their number is 815-675-2321.


dj  Posted: 10/08/2015 14:37 PM 

i need to control a 1hp. 3phase, 460volt, with a timer i know one can do it with a 230v intermatic timer, Can you supply the wiring diagram for the 1hp submersible water pump motor?