Question about Fahrenheat Electric Hydronic Baseboard Heater, 240 Volt

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I want to install a timer on a 240v wall heater. Do I intercept just one leg?

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Hi and welcome to FixYa,

The short answer is yes. A few other ideas you may want to consider:

  • current capacity of the contacts of the timer switch (relay);
  • terminals should be screw type, not soldered nor plug-in;
  • preferably switch the Line 1 (the hot wire);
  • for safety reasons, separate fuses for the timer circuitry as well as the load (heater).
Good luck and thank you for using FixYa.

Posted on Feb 23, 2009

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Electric Wall heater programmable thermostat


First of all most home thermostats operate on 24volts. If you want to have one that directly turns the 240 volt power on and off you need to get a special 240V line voltage thermostat. How many wires come out of your heater? Most 240v circuits have three wires. A white wire for the common and two black or black red wires that are +120 volts and negative 120 volts. That's why a 240 volt plug has 3 prongs instead of two. If you look at the wiring diagram that comes with the thermostat it should give you an idea of how to hook the wires up. In your particular case though, I think I would try making friends with an electrician.

Nov 09, 2013 | Hardware & Accessories

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How do you wire the intermatic fd60mwc timer 220v? there are no lugs for the second line and load on the right side of the unit.


You can turn off 240Volt circuit by turning off 'one leg.'
240Volt circuit has two hot wires that come from breaker box, so 240V has two legs:
These hot wires are usually labeled L1 L2 in wiring schematics.

FD60 timer is usually SPST and has two wiring terminals, but some versions are SPDT and have 4 wiring terminals.
Cut L1 line in half, and put each end into FD60 terminal.
Open following link for rough drawing:
http://waterheatertimer.org/images/FD60-wired-to-control-240V.jpg

Open following links for more illustrations and information:
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/See-inside-main-breaker-box.html
http://waterheatertimer.org/Countdown-timer-horsepower-ratings.html

Jul 27, 2011 | Intermatic FD60MWC Energy Controls -...

1 Answer

I REQUIRE A TIMER THAT WILL LOOK AFTER 220 VOLTS FOR A SMALL WALL BUILT IN ELECTRIC HEATER SPRING LOADED 30MIN


You want spring-operated 30 minute countdown timer for 240Volt electric heater.
You don't say how many watts your heater is.
Answer is longer without knowing watts.

1) As you know, you can turn off any 240Volt circuit by turning OFF one hot leg.
http://waterheatertimer.org/240-v-water-heater-circuit.html#120-240
People are skeptical when working with 240 V and believe both hot wires have to be turned OFF.
But you know the heater needs both hot wires. Disconnect one hot wire and see.
240V water heater thermostats operate in this way ... they turn OFF 1 hot wire.

2) Intermatic FF30 and FD30 series timers can directly turn off 1 leg of 240Volt 2500 watt heater.
Max 2500 watt, no more.
This Intematic timer is rated for wattage shown. With other brands, check the rating.
Amazon sells FD30 30-minute
http://www.amazon.com/dp/B00004W4WW/ref=sc_vs_google_Intermatic_2520FD3

3) Intermatic also makes DPST timer if you want to turn OFF both hot wires
Aplussupply sells FF and FD Intermatic timers, and 30-minute DPST model FD430M
The rating is same as shown above.
http://www.electricsupplyonline.com/prod/intermatic-springwound_timers.php
http://www.intermatic.com/products/timers/in-wall%20timers/decorator%20spring%20wound%20timers.aspx

4) If your wattage is greater than 2500 watts, then you need to install a 30amp contactor with 120Volt coil. Timer turns magnetic coil on-off, coil opens and closes contacts that turn heater on-off. You can use any ordinary light-weight wall timer with a contactor.
http://waterheatertimer.org/Countdown.html

5) Following page gives you information for installing a contactor to handle 240Volt loads up to 5500 watts.
Pages show how to wire, where to buy, what to buy.
http://waterheatertimer.org/How-to-install-water-heater-timer.html

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 26, 2011 | Hardware & Accessories

1 Answer

No hot or warm water what is the voltage reading susposed to be on the heating elements? I have 122 volts on each terminal on both elements but no action, what am i doing wrong?


If water is totally cold, then upper element is not getting 240V. Since element tested for 120V, then that says upper element is burned out, upper thermostat is bad, or circuit breaker is bad.
Best thing is to buy multimeter and do 30 minute troubleshoot:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Also read information below for understanding how water heater works.

Testing elements for voltage can be misleading.
If water heater has 2 elements, then tank is 240Volts.
240V water heaters have 120V on each element at all times.
So elements have hot 120V power, but they are not turned on until the circuit is complete with 240V.
Open following links to read specifics about 120V and 240V
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/How-water-heater-thermostat-works.html

240V is made from two 120V Hot wires from breaker box.
Each 120V line from breaker is called a 'leg.'
So 240V circuit has two legs, and both legs need to be turned on to complete 240V circuit.

Water heater thermostats turn off only one leg.
The other leg is Hot all the time.
So when you test screws on an element, for example test between a screw and any bare metal part of tank, then the screw will always show 120V.
That is just one leg of the 240V circuit.
But the 240V circuit is not turned On until both legs are connected.
Every residential circuit needs two wires to complete the circuit, and in the case of 240V, those two wires are both 120V.

When the thermostat turns on, it turns on the second leg to the element and that completes the 240V circuit.
http://waterheatertimer.org/How-it-works.html

Dec 16, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I have a Et 70115C Intermatic Timer, I want to install it on my Hot Water Heater, I have connected the 2 110V leads from my breaker to Terminals 1 & 2 and connected the two leads from the hot water...


A) 5 terminal ET70115C.
Voltage selector set to 240.

B) BUT you say you have 120Volts from breaker >>> confusing, so I'm proceeding on basis that you meant to say 240V from breaker.
Add a comment at any time.

C) Review timer:
5-terminal ET70115 timer has NO and NC terminals
NC is normally closed >> this terminal has power when timer is OFF
NO is normally open >> this terminals has power when timer turns ON
For water heater, you want NO terminal 4 so water heater turns ON when timer turns ON

D) Wire for 240Volt water heater

Two hot wires from breaker connect to terminals 1 and 2. This powers timer clock.
Jumper wire connects between terminal 2 to terminal 3. This sends power to the switch circuit.
Wires to water heater connect to terminals 1 and 4

E) 5-terminal timer turns off 1 hot wire to 240V water heater.
Turning off 1 hot wire will stop 240V circuit from working; Water heater thermostats also turn off one hot wire.
240V water heater has black and red wire.
Wire from terminal 4 should connect to Black wire on water heater.

Diagram shows two wires on terminal 1
Two wires on terminal 2
One jumper wire on terminal 3
One wire on terminal 4
Zero wires on terminal 5


geno_3245_133.jpg

Dec 03, 2010 | Intermatic ET70115C Electronic Energy...

1 Answer

Dear sir I am trying to connect Model Et104, my questions are as follows: I am having a problem connectiing your system. Both power source 110v and 220 volts have to connect to your system???? If my...


Fixya answers questions about other people's products.

I specialize in timers.
Intermatic is changing their product line
I suggest you download the manual:
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/et104c%20-%20english.ashx

The manual is generic across all the ET100 series products.
The manual does not describe individual models.
The instructions are on the timer door.
Look for the clock voltage.
The clock voltage tells the story of your timer model.

NOW lets say your clock voltage is 120V.
I believe you suspect the clock voltage is 120V.

To make this timer work with your 240V cable, there are 2 methods

Method 1) To meet code, run a white wire from nearby 120V receptacle.
This is a Neutral wire.
Connect the Neutral to terminal 1
Connect one leg from the 240V cable (1 of the 240V wires) to terminal 2 and that will complete the 120V circuit and the clock will run.
This is true because each leg of a 240V circuit is actually 120V, and only when the two legs are combined do they produce the 240V circuit

Method 2) Connect bare ground wire to terminal 1 and to grounding screw
The bare wire connects to the Neutral busbar in the main breaker box, so it will complete the 120V circuit just as described above.
This is not code, but your clock will operate.
Then connect one leg from the 240V cable to the terminal 2

IF your clock is 240 V, then connect both legs of the 240V cable to terminals 1 and 2

7:59 CST Add a comment if you need more assistance, I will be here later this evening

Nov 06, 2010 | Intermatic INC ET104C 24 HOUR ELECTRONIC...

1 Answer

My EH40 is not supplying power to the water heater. I hooked the power line in to posts 1 and 2 and I hooked the load out to posts 4 and 6. When I use my power checker it reads no power to posts 3,4,5,...


I have an EH 40 sitting in front of me right now.
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html
The link above shows correct 240V water heater timer wiring for EH40
Link below shows an overview picture of EH 40 connected to 240V water heater
http://waterheatertimer.org/images/EH40-water-heater-circuit-5.jpg
http://waterheatertimer.org/240-v-water-heater-circuit.html


EH40 has a 240V clock.
Terminals 1 and 2 send power to the 240V clock
Power to the clock terminals do not pass through timer to any other terminal

How to wire EH40 for 240V
240V line has 2 hot wires from breaker box.
Lets call these wires Hot1 and Hot2
These wire are interchangeable on 240V circuit
Hot1 connects to terminal 1 with a jumper to terminal 3 (or connect to 3 and jumper to 1)
Hot2 connects to terminal 2 with a jumper to terminal 5 (or connect to 5 and jumper to 2)

240V circuit has 2 wires going to the Load
Let's call these Load1 and Load2
These wires are interchangeable on 240V circuit
Load1 connects to terminal 4
Load2 connects to terminal 6

If the timer is still not working, go back to the breaker and test if it is delivering 240V to the circuit.
If breaker is bad on one leg, then the circuit can test with live power, but the 240V appliance will not work.
240V circuit requires both legs of 240V before circuit is complete.

Oct 24, 2010 | Intermatic EH40 - Electronic Water Heater...

1 Answer

My intermatic model T104 was not activating. I bought a new one yesterday but sill not activating. Howcan I prove the unti when it has two white cable only. Please advise asap. Thanks


T104 is 240V timer with 240V clock motor.
-This timer will not work for 120V circuits.
-Test your two wires for 240V.
-If your load (lights, motor etc) is 120V then you need the T101 timer.

Confusion about cables
When you say 2 white cables, does each cable have a black and white line?
If you have two cables with black and white lines, then one comes from breaker box, and the other goes to load ( water heater, motor, lights etc.)

How to wire T104 for 240V
How to wire T101 for 120V
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

Sep 16, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

1 Answer

Kenmore 80 Series No Heat


The heater gets one leg of power through the timer and one leg through the motor terminal.Make sure power is leaving the timer and terminating at the heater. Check the switch on the motor for continuity for the other leg of power.(The motor must be running to check this switch).

Aug 24, 2009 | Kenmore 63942 Dryer

1 Answer

How to hard wire 240 volt wall heater


Black is 120v hot
Red is 120v hot
Black and Red go to opposite legs to get 240v between them.
White is 0v neutral
copper is Ground

Dec 27, 2008 | Fahrenheat (FFH1614) Wall Mounted Panel...

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Need wiring help with Fahrenheat PLF754 240V baseboard heater with Fahrenheat PT2DS double-pole thermostat Open kimono - I know enough about electrical wiring to be dangerous. I have a Fahrenheat PLF754 240V baseboard heater and a Fahrenheat PT2DS (also known as Marley T2) double-pole integrated thermostat that and the heater isn't working. My power supply is a single cable with white, black, and red wires. I traced the supply line back to the circuit panel and found that the red and black wires terminate on a DP-40A breaker. The white wire is grounded. The heater has 2 red wires exiting a center tube at the end of the heater where the thermostat goes and 2 black wires exiting a small cut-out near the top of the same end. There's also a green ground wire from the heater. The thermostat has 2 red wires on the left top and bottom, 2 black wires on the right top and bottom, and a green ground wire. An electrician friend of mine (since left town) installed the wiring, heater, and thermostat for me. It worked fine for about 1 year and then stopped working. I'm trying to troubleshoot the problem but don't have any documentation on how this thing should be wired or how I might isolate the problem to the thermostat, heater, or both. I did verify that the power supply is good. Everything is currently wired as follows: Black power supply to black thermostat (top) Red power supply to black thermostat (bottom) One black heater to red thermostat (top) Other black heater to one red heater Other red heater to red thermostat (bottom) Green heater to green thermostat White power supply not connected - just wire-nutted Can anyone confirm this is the correct wiring for this configuration and, if not, what it should be? If this is correct, how best to isolate the problem? Thanks!

Dec 06, 2012 | Fahrenheat Electric Hydronic Baseboard...

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