How to wire GM40 timer to 240vac

TU40 is analog dial timer, wired same as GM40, DTU40, GE15000 series etc
http://waterheatertimer.org/How-to-wire-GM40-timer.html#TU
http://waterheatertimer.org/images/Wire-GM40-timer-600.jpg
http://waterheatertimer.org/images/Wire-GM40-timer-120V-600.jpg

TU series can handle motor load 3Hp @ 240V, 1.5Hp @ 120V
TU series automatically detects voltage... no dip switch selection

How to set analog timer dial:
http://waterheatertimer.org/How-to-set-timers.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Something is fried. Probably the electronics if relays turn on-off with override.
http://waterheatertimer.org/How-to-wire-GM40-timer.html
http://waterheatertimer.org/How-to-wire-Whole-house-surge-protector.html
http://waterheatertimer.org/How-to-wire-GE-15207-timer.html

2) Try moving dip switches to different voltage, and change wiring and voltage for possible work around.
For example if you are controlling 240Volt, then move dip switches to 120V and run neutral wire to timer and use one 120V hot leg from 240Volt circuit to power clock motor.

3) If timer module is not rotating, then remove module for identifying marks on back. Order new FM1 timer module.

4) There is no reset protocol for this timer, or surge protection. Timer has one year warranty against workmanship defect. There are no replacement circuit boards.

5) Buy cheaper-made GE 15207 timer at Home Depot. Then if timer goes bad, buy another timer and return defect in new box for refund. This gives timer owner unofficial extended warranty.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Woods 59402 timer wires identical to Intermatic GM40, with same ratings and dip-switch settings.
http://waterheatertimer.org/How-to-wire-GM40-timer.html

Here is specific wiring diagram per your request, showing 240Volt input controlling two 120Volt outlets.
http://waterheatertimer.org/images/GM40-wiring-240v-120-volt-5.jpg
http://waterheatertimer.org/See-inside-main-breaker-box.html

Keep in mind that with 240Volt, both hot wires coming from breaker box carry 120Volt each, with 240Volt potential across both hot leads.
Each 120Volt Hot from breaker box, also carries 120Volt potential to Neutral or ground wire.
So the 240Volt wires from breaker box can supply the Hot for a 240Volt circuit, but the circuit must also have a neutral wire to complete 120Volt circuit.

Be mindful that timer is not 2-channel, so both outlets are controlled by same timing schedule.
If you want two different schedules for the outlets, then buy a 2-channel timer like Intermatic ET1125. Wiring for ET series remains similar to illustration link above.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

10-22-12
Intermatic ET1125 240Volt, two independent circuit Wiring shows on following link: Wire colors can vary. 240Volt line can be black-white, or red-white, or black-black. Non-code wiring can be white-white.
http://waterheatertimer.org/How-to-wire-Intermatic-ET-series-timer.html#1125

I have no idea what color wires you have.

Add a comment and include photo and more information about your wires.

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Copy following link for GM40 wiring:
http://waterheatertimer.org/How-to-wire-GM40-timer.html#277

Refresh page using Ctrl+F5 key

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Copy following link for illustration showing GM40 controlling 2-speed pool pump.
http://waterheatertimer.org/How-to-wire-GM40-timer.html#pool
Same wiring applies for 120Volt or 240Volt.
Voltage, Wire colors and wiring illustration appear on pump name plate.
Be sure to set dip switches before applying voltage to timer.
Do not test wires by sparking against terminals. Use a tester.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following links to help identify correct wiring:
If you are wiring GM40 timer, be sure to set dip switches before applying power.
http://waterheatertimer.org/How-to-wire-GM40-timer.html
http://waterheatertimer.org/See-inside-main-breaker-box.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Open following links to identify timer and download manual:
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#GM

GM40 can be used for 120V or 240V 277V applications for single-phase and some 3-phase applications.
For 120Volt, set all 4 dip switches to ON position BEFORE applying power.
ON position is pushed to left.

120Volt cable from breaker box has black hot and white neutral wire.
Black hot typically connects to terminal L1
White neutral connects to terminal L2/N
This action will power the time clock and relays.

Other terminals on GM40 are the relay terminals, and these terminals are dry.
Dry means they receive no power when wires are connected to L1 and L2/N.

There are two independent relays and each relay has 3 terminals: NC NO and COM.
If you are controlling one 120volt Load, then use one relay.
Run a jumper wire from terminal L1 to COM terminal.
So COM terminal is connected to Hot.

Cable going to 120V Load has black and white wire.
Connect black Load wire to terminal NO (normally open).
Connect white Load wire to L2/N.

Online manual for GM40:
http://www.intermatic.com/products/grasslin/electromechanical%20time%20switches/multi-voltage%20time%20switches.aspx

http://www.intermatic.com/~/media/files/intermatic/products/instructions/grasslin/gm40%20-%20english.ashx

You own a high-quality time piece.
I have defrost versions of same timer and have tested aspects of the timer, and own few FM1 series clock mechanisms for various projects.

Complete run down for setting GM40:
1) For 240Volt the dip switches are set: Please set dip switches before applying power to timer.
4-OFF
2-ON
3-OFF
1-ON

2) Line wires are the Hot wires from breaker box.
Line wires connect to terminals L1 and L2N

3) Load wire are wires that go from the timer to water heater.

4) Jumper wires are short lengths of same gauge wire.

5) There are many ways to wire GM40 timer
Open manual and look at wiring diagram titled: Controlling one 240VAC (Dual Phase) Load

6) A jumper wire is added from terminal L1 to COM
Another jumper wire is added from terminal L2N to COM2

7) Load wires going to water heater are connected to NO and NO2

8) Following image shows typical FM1 timer dial:
http://waterheatertimer.org/images/FM1-timer-002-350.jpg
As timer dial rotates the pins move small red switch that turns Load on-off.
Move pins in-or-out to control Load.

9) If you are uncertain about your pins, then set 20 consecutive pins one direction and then manually rotate dial and watch green indicator light turn on-off.
Put tester across NO and NO2 terminals and check when 240V turns on.

10) If you have defective timer, contact Intermatic:
http://www.intermatic.com/customer%20service.aspx

11) Add a comment for more free help.
Also take advantage of fixya expert assistance live.
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.

Here is the instructions for your unit:

Intermatic GM40

Go to page #4 for wiring instructions on 120v dual loads.

Hope this helps and please rate this!