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I have an intermatic T101 timer to put in the line for my 240 volt water heater. Can you provide a wiring diagram

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Click here for the manual with included diagram

Posted on Apr 04, 2011


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Intermatic t101

99% chance the Timer wires are reversed ... and line from breaker and line to pump are reversed. Or remotely possibly the circuit is 240V, and somebody changed clock motor on old T101 from WG1570 to WG1573, converting old T101 into T102...
Add a comment with what you discover

May 14, 2013 | Hardware & Accessories

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Can you use a plug in timer to switch your storage heater on during the cheap rate electricity

Generally NO. Depends on amp rating of timer, wattage of water heater, and line voltage.
Look at label on side of heater for watts.
Electric water heater will work on any voltage.

1) Start with 120 Volt outlet::
Volts x amps = watts
Watts divided by volts = amps
Let's say outlet is 120Volts. Lets say water heater is rated 4500 watts.
4500 divided by 120 = 37 amps
There is NO plug-in timer rated for 37 amps.

Let's say water heater is rated 900 watts.
900 divided by 120 volts = 7.5 amps

Yes. The Intermatic HB113 timer will handle up to 8 amps.

2) 240 Volt outlet
Same calculations as above.

1900 watt element divided by 240 volts = 8 amp.
Yes, the Intermatic HB112 timer will safely handle that element.

3) Here are some water heater timers:

4) Here are some off-peak water heater ideas.

Oct 31, 2012 | Hardware & Accessories

1 Answer

I need installation or wiring diagram for Timer Intermatic T101

Copy following link for 120Volt T101 timer wiring options:

Nov 29, 2011 | Home

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1) T101P201 timer does not have a separate manual yet

2) However typical T101P201 timer is ordinary T101 timing mechanism inside Nema 3R beige-colored outdoor plastic enclosure, with additional fireman's switch.
Wiring for T101 shows on following link, and shows on door of timer enclosure:
Check that your timer terminals match illustrations because many timers can fit inside Intermatic enclosures.

3) Fireman switch wiring:
T101P201 has a fireman's switch that wires directly to the pool heater thermostat.
If you are not using the timer for pool heater, or if heater does not have connection for fireman's switch, then do not connect fireman switch wires, and just tape them out of the way.

Add a comment for more information

Jun 16, 2011 | Intermatic & Indoor/Outdoor Rain Tight...

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I think I have My T101 time switch wired wrong I have nothing under terminal A ! side of my whit to terminial 1 and the other side of my white to terminal 2 which feeds my water heater and the blacks tied...

The timer that you have is a 120 volt timer. You are only breaking 1 leg of electricity which means in the off postion you still have 120 volts going to the heater. Also the clock will not function because you do not have a neutral going to the A terminal. You will need to replace time clock with a 240 volt clock T 104

Sep 24, 2010 | Intermatic T101 - 24 Hr. Dial Time Switch...

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I have a problem with my wh21 intermatic hot water heater timer.When it trips off the indicating light is still on dimly and there show low 92 volt on load side.

There is a short. The timer mechanism is mechanical, so the problem is not failed electronics.
The WH21 is for 240 volt circuits, so it has 2 hot wires and 1 ground from the breaker box. Only one hot line to the water heater is turned off, but both lines are attached to screw terminals at timer.
To see if the problem is a shorted element or shorted wire in water heater, disconnect hot leads to water heater one at a time, and then test. Then disconnect ground wire from water heater and test again. Then disconnect all wires to water heater, and test again.
If the problem is in the water heater, search for troubleshooting steps on internet. Focus on testing elements.
If the problem is not in the water heater, then a frayed wire on back of timer is next checkpoint. The timer motor is the final suspect. You can detach the timer motor from the housing, and test for stray voltage. Intermatic WH21 is inexpensive to replace.

Aug 23, 2010 | Electric Intermatic Inc Wh21 Water Heater...

1 Answer


Here's the wiring diagram:

The wiring is as follows:
Connect _both_ the incoming and outgoing neutrals (white) wires to the "A" terminal. The incoming [(LINE) (hot) (from the breaker or source)] black wire is connected to the #1 terminal and the outgoing (LOAD) black wire is connected to the #2 terminal.
Both of the bare or green wires are twisted together along with a 6 inch or so pigtail using a red or yellow wire nut. The pigtail is then connected to the green "GR" screw on the enclosure.

May 07, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

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How do you wire a model GMXST-1-240-M Intermatic timer

There are many ways to wire the Intermatic GMXST-1-240-M timer. If it is not wired correctly you can permanently damage the timer.

For "regular" use, if all you want to do is turn a 240 volt load ON and OFF with the 7-day timer, and you are _very_ sure that you have a 240 volt timer (they can be 120 volt or 240 volt), here is how to wire it:

LINE connections:
The first incoming LINE (L1) 240 volt wire (pick one) is connected to terminal #1. A jumper (same wire size) is then installed from terminal #1 to terminal #3 [(COM) or (Common)].

The other incoming LINE (L2) 240 volt wire is connected to terminal #2.

LOAD connections:
The first outgoing (LOAD) 240 volt wire (pick one) is connected to terminal #2 _also_.

The other outgoing (LOAD) 240 volt wire is connected to terminal #4 [(NO) or (Normally Open)].

Again, while this is still just a basic timer there are at least 10 different ways to wire it depending on what kind of equipment is used, how one wants to control the equipment (using the Normally Open or Normally Closed contacts) or (HI or LOW speed for a 2 speed fan), the clock voltages (120v or 240v), and the load voltages (24 volt to 240 volt).

If you are not sure how to wire this timer after reading this post, I highly recommend posting back with very specific information or calling a _qualified_ electrician, as mis-wiring this timer can permanently damage the timer, connected equipment, and/or personnel (that means you).

Here is the wiring diagram:

Feb 27, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

1 Answer

I need to instal a mechanical time switch

john, i'm assuming the water heater is 240 volts and the timer is 240 volts, if ok follow these instructions. the 2 wires coming from the breaker box goes on 1 & 3 screws, also each yellow wire going to the timer motor goes on 1 & 3. now the 2 wires going to the water heater goes on 2 & 4. be sure to ground the timer box

Apr 13, 2009 | Intermatic & Indoor/Outdoor Rain Tight...

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