Question about Intermatic Fm1stuz-120u 24 Hour Time Switch Module

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Two screws marked timer 1 screw nc 1no 1com wiring for timer spst 120vac power2 timer screw 1 power out at screw2? power in power out???

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  • lyle maes
    lyle maes Jan 01, 2011

    Thank you.I should of remembered that

  • lyle maes
    lyle maes Jan 01, 2011




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The timer screw 1 is the hot to run the timer.... the screw 2 is the neutral to run can jumper from screw 1 the hot to the COM terminal...then power out comes off of either NC or NO depending if you want normally closed or normally open power to whatever you are running....


Posted on Dec 31, 2010


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I'm replacing a missing relay on coleman furnace 7655-856, 120vac, 24vac 40amp 1no/1nc. what is the input voltage of the coil?

Input voltage to a 24v coil will be 24 volts ac. The 120volts is on the load side, NO/NC switches. The coil that causes the switches to act is a 24 volt coil.

Sep 11, 2017 | Coleman Heating & Cooling

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I need a wiring diagram for an Omron H5CX-A timer

Wiring will appear on side of timer.
Test the timer with multimeter to see which terminals are connected. When timer has no power, then Com and NC terminals will have continuity.
H5CX-A Timer has 11 screw terminal connections and timer is rated 100V to 250Volt AC 50-60Hz.
Input is power IN > this is the 100V to 250Volts coming from breaker box or transformer. For example input terminals might be labeled A and B.
This will give power to timer, but remainder of screw terminals have no power.
To put power to relay terminals, jumper the power from Input terminal A to COM terminal.
For example Com terminals might be 7 and 9.
So jumper Hot wire from Terminal A to terminal 7.
This action will put hot on Com terminal 7, but also give power to the NC terminal.
For example the NC terminals might be 1 and 3.
So when timer is OFF, the NC terminal has power.
Then when timer turns ON, the NC terminal no longer has power, but the NO terminals are Hot.
NO terminals might be 4 and 6, and these terminals turn on-and-off when timer turns on--and-off
Open following link to help with Omron 11-pin wiring:

Jun 14, 2012 | Omron Hardware & Accessories

1 Answer


Wiring diagram shows on side of timer and looks same as to following illustration:
For more complicated illustration showing din rail and modular timer wiring variations:

With din rail timers, the power connects to screw terminals 1 and 2 and this will run the clock and relay.
The TE502 image is bad, and I can't see wiring diagram exactly.
It appears that terminal 4 is common. This is typical for din rail timers.
Put Hot lead to terminal 4.
Terminal 3 appears to be the NO terminal, so put wire going to Load to terminal 3.

Jun 20, 2011 | Electrical Supplies

1 Answer

C8835 Intermatic Timer, 30 Minute Cycle, used for and EFM coal stoker to keep it burning in summer. We are not sure how to hook up the timer, we did put the green wire on the green nut, not sure which...

Intermatic C8835 is 120Volt 30-minute cycle timer, which repeats same timing cycle every 30 minutes.
Timer has NO and NC terminals.
You will not use the NC normally closed terminal for this application, so no wire will connect to far left NC screw.

Green wire on green screw is correct, so you have started off well.
Bare copper wire also connects to green screw, so no more talk is needed about ground wires.

If you are using 240V or 277V, then add a comment and we'll lay out a plan for that wiring.
Wiring below is for 120V only.

You have 2 120Volt cables.
1) One cable comes from circuit breaker and has 1 black and 1 white wire.
The black 'line' wire connects to 'switch common' terminal, which is 3rd screw from left.
The white 'neutral' wire connects to 'clock' terminal, which is 4th screw from left.

2) The second cable goes to coal stoker, and has 1 black and 1 white wire.
The black wire connects to Normally Open or NO terminal which is 2nd screw from left.
The white wire connects to Clock terminal, which is 4th screw from left.

Notice that both white wires connect to same screw.

Upvote the help.
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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.

May 16, 2011 | Intermatic C8835 Cycle Timer

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Need wiring diagram SPST power to timer timer to light . two screws marked timer 1 nc 1no 1 com

Here are two possible solutions, since timers are made different ways:

1) Diehl timer has 5 terminals
Drawing below shows wiring for Diehl SPST:

2) Your timer might also be wired as follows:
Two screws marked 'timer' are for 120Volt Hot and Neutral that power the clock motor (in drawing above, these are terminals 1 and 2).
Another Hot wire connects to COM. (in drawing above this hot wire shown connecting to terminal 3)
Load wire connects to terminal NO (in drawing above this wire shown connecting to terminal 4)

3) NO is Normally-Open turns ON when tier turns ON
NC is Normally-closed is ON all the time, EXCEPT when timer turns ON. So NC terminal turns OFF when timer turns ON.

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Fixya is always less expensive than a service call.

Dec 31, 2010 | Diehl TA-4150 24 Hour Electromechanical...

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Why do I need to use the Jumper? Does the timer close the circut on the nutrel side only or does is close both ?

EH10 has four screw terminals: 1 2 3 4
EH10 has two screw terminals exclusively for electronic clock motor.
These terminals connect exclusively to clock ... there is no internal jumper that passes power to another terminal.

Terminals 2 and 3) Black Hot lead connects to two terminals. Hot connects to terminal 2 and to terminal 3 ... so you put a jumper wire between terminals 2 and 3.

Terminal 1) All neutral or white wires connect to terminal 1, so there are two white wires on terminal 1.

Terminal 4
) Black wire going to 120V Load connects to terminal 4.

Contrast EH10-electronic-timer with T-101-electro-mechanical-timer. T-104 clock motor has two separate wires that connect to terminals A and 1. Electronic clock doesn't have those separate wires.

Your second question about closing the circuit.
When timer turns ON, it closes circuit between terminals 3 and 4.
So the Hot is closed.
Neutral is not closed, it is open at all times.
EH10 is SPST timer ... One single pole is opened-and-closed (SP), and timer completes action with a single throw (ST)

Nov 24, 2010 | Intermatic 7 Day Electronic Timer Eh10...

1 Answer

I have a 110 Pool Pump and I am trying to wire it into a Tork1103NC timer. From the pool pump I have a black, white and green wire that I need to wire into the timer. Can you tell me what position those...


Here is Tork 1103 wired for single load.

1) The green pump wire and bare copper wire go to green ground screw
2) Pump black wire goes to pole 2, the NO (normally open) pole
3) Pump white wire goes to unmarked screw

4) Black from circuit breaker goes to pole L
The T1103 comes with a removable brass bar that connects pole L and pole 1
If that removable brass bar is not there, then add a jumper between pole L and pole 1 as shown in diagram above
5) White neutral from breaker box goes to unmarked pole (all whites connect to unmarked pole)

In your case, pole X is not used. Pole X is NC or normally closed > which means the power is ON continuously until timer turns on, and when timer turns ON, the NC pole turns OFF

Oct 11, 2010 | TORK Variable Cycling Timer 8601

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I'm in need of an inexpensive timer, preferably mounted in a wallswitchbox, which has two output circuits, one from a n/o and one n/c contact. Can you recommend a model? Thank you

Instruction sheet
Sales sheet

Deihl spa-and-pool timer shows a 15A DPST NC NO timer in sales sheet
Wiring diagrams show DPST.
However most 880's sold are 125V SPST.
Deihl makes 125 V, 24V and 240V models ... but I don't have product sheet that shows all models

I don't see any NO NC wall-timers while looking at: Woods, GE, Intermatic, Aube, Hagar, Leviton, Lutron, Paragon, Pass and Seymour, Swilight, Sylvania, Timex, Tork, UPM, Utilitec

Box timers by Intermatic offer NO NC:
T1900 series

Ordinary 3-way switch is NC NO
Ordinary 4-way switch is NC NO can be wired to control 2 independent circuits

There are heavy load NO NC contactors (relays)
Item 2cg37
You can wire ordinary wall timer to control the contactor

Oct 08, 2010 | Hardware & Accessories

1 Answer

Wiring program timer switch model t1905 intermatic

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T1905 has 4 screws: NO normally open > NC normally closed > COM > Clock
NO screw is on left
NC screw is 2nd from left
COM is 2nd from right
Clock is on right

A) How to wire t1905 for 125V
You will have four wires >> a Black and White from breaker box; and a Black and White to load

1) Black hot wire from breaker connects to COM
2) White neutral wire from breaker box connects to Clock
3) White neutral wire to load connects to Clock
4) Black wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]
NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect Black wire to NC screw

B) How to wire t1905 for 240V
You will have four wires >> 2 hot wires from breaker box; and 2 hot wires to load. These wires might be Black and White or Black and Red

1) Black hot wire from breaker connects to COM
2) Red or White hot wire from breaker box connects to Clock
3) Red or White hot wire to load connects to Clock

4) Black hot wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]

NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect black wire to NC screw

Sep 10, 2010 | Intermatic Timer T1905 24 Hour Dial 120V...

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