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How to wire Tork DTU40 / DTWH40 timer

Tork digital timers and manuals
Tork DTU water heater timer
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Tork DTU
40 amp 120V-208V-240V-277V 

Buy 24 hour/ or 7-day
DTU40 At Amazon

DTU40 instruction manual
Sell sheet with model numbers
Tork TU universal timer
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Tork TU series
40 amp 120V-208V-240V-277V
Automatically detects voltage
24 hour 15 minute intervals 
Tork TU series DPDT/ 120-277V
Tork P1104-M 240Volt SPDT at Amazon
Tork P1104FM 240V SPDT with fireman switch

Manuals/ Resources:
Sell Sheet
GE 15136 timer
40 amp 120V-208V-240V-277V 
Buy 24 hour or 7-day:
GE 15136/ 7 day/ 7 programs /40 amp/ outdoor metal box

GE 15132 manual
How to wire GE 15136
More GE timers and manuals
GE 15136 timer
40 amp 120V-208V-240V-277V 
24 hour 15 minute intervals 
Buy 24 hour:
GE 15135 24-hour/ 40 amp/ outdoor metal box

56922 plastic box at Amazon

15207 Manual
Quick-start guide to wiring
More GE timers and manuals
Intermatic GM40AVE
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GM40AVE digital 
40 amp 120V-208V-240V-277V 
Automatically detects voltage
7-day programmable, 20 on 20 off set points
Power outage backup
GM40AVE  120-208-240-277Volt
GM40AVE at Intermatic

GM40AVE manual
GM40AVE sell sheet
FM1D 20 setpoint programming
GM40 timer
GM40 series
40 amp 120V-208V-240V-277V 
7-day and 24 hour
Dip switch voltage selection

GM40 24 hour at Amazon
GM40 7-day at Amazon
GM40AV   auto detect voltage
GM40AVQ  auto-cetect  w/ back-up battery

GM 40 series timers with same wiring
Compare all box timers
Woods 59402 timer
40 amp 120V-208V-240V-277V 
Jumpers to select voltage
24 hour 15 minute intervals 
Buy 24 hour:
Woods 59402 timer

59401 and 59402 manual
59402 sell sheet
More Woods timers
water heater timer
Intermatic 24 hour timers
Tork box timers

Compare all box timers
Tork DTU water heater timer
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DTU40/ 120V; 208-240V; 277V/ Automatically detects input voltage/ random mode/ battery backup/ outdoor box

Tork 9000N Indoor/ outdoor plastic enclosure
120-240Volt/ 40 amp NO contacts/ 30 amp NC contacts
7 ON-OFF per 7-day week/ choose blocks of days or individual days/ or random function
Minimum set time 1 minute
Power outage backup
Can be wired to control 2 separate loads/ 3-phase loads/ etc

Buy DTU40:
DTU40 at Amazon
GM40E timer module instructions/ pdf
Tork DT series sell sheet
Tork DTU40 timer instructions
DTW40 water heater timer

DTWH40/ 120-240 volt water heater timer/ override located on clear plastic cover/ random mode/ battery back up/ indoor box

Outdoor clear plastic enclosure
120-240Volt/ 40 amp NO contacts/ 30 amp NC contacts
7 ON-OFF per 7-day week/ choose blocks of days or individual days/ or random function
Minimum set time 1 minute
Power outage backup
Can be wired to control 2 separate loads
Buy DTWH40:
DTWH40 at Amazon
Sell sheet
Tork DT series sell sheet

Tork DTW40 timer instructions
FM1 digi timer
Intermatic/ Grasslin GM40E module
A = AM; P = PM

GM40E timer module/ Used on Tork DTU series timers (above)

GM40E timer module also used on Tork 454 old design, Grasslin CP924, Westinghouse/Stanley timer max, Intermatic DTAV40E2 defrost timer
Tork DTU40 timer   
DTW/ DTU timers have typical NO NC terminals found on many brands and models
How to wire Intermatic GM40 timer
Intermatic Timer modules
GM40E timer module instructions/ pdf
Intermatic terminal wires Fire safety resource:
Do not use stranded wire without soldering to make solid end. Stranded wire will come loose and cause arcing.
Use only solid copper wire. Do not use aluminum wire.
Maximum 2 wires under same screw plate.
Do not use 2 different gauge wires under same screw plate.
For more wires, or differen gauge wires, attach with wire nut and connect jumper wire to screw plate.
Tighten screws very tight against copper wire.
Keep Door to enclosure closed at all times.
Turn off power before working on wires.
DTU40 timer wiring

240 Volt (208-240V)

Wire DTU40 for 240Volt water heater

Basic 240Volt wiring
Turns OFF both hot wires going to load
Same diagram applies to voltages 208-240

Use 30 amp breaker and 10 gauge wire for any 240Volt water heater exceeding 3800 watts.

More ways to wire for 240Volt
Figure volts amps watts for water heater
Wire size charts

277 Volt

Timer automatically detects voltage
Same diagram applies to 277V, except white wire is Neutral and no black tape is added
When using black-and-white wires for 240Volt, add tape to white wire.
This action will tell next electrician that white wire carries power
GM 40 timer controls 2 water heaters

240 volt (208-240V)

DTU40 controls two 4500 watt 240Volt water heaters
Turns off 1 hot wire to each water heater

Use 40 amp breaker and 8 gauge wire to timer.
Use 10 gauge wire to each water heater
Timer not rated for controlling two 5500 watt water heaters

How water heaters work
How to wire water heaters
Figure volts amps watts for water heater
Two water heaters
Wire sizes

240 volt

DTU40 controls two 4500 watt 240Volt water heaters using dry terminals
Timer can control two different voltages, and two separate circuits.
Both circuits turn ON-OFF at same time.
Control any voltage with dry terminals that are separate from clock terminals
Two separate wires from breaker box.
Turns off 1 hot wire to each water heater

Two water heaters

Use two 30 amp breakers and 10 gauge wires when wiring two 240Volt water heaters with element wattage over 3800 watts.
GM 40 timer controls two water heater

240 volt

DTU40 controls two 240Volt water heaters

One or other water heater is ON.
Both heaters not ON at same time
Use 10 gauge wire

Two water heaters

Tork DTU40 208-240 volt 3-phase timer
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120-208-240 volt

Example: High leg delta
Tork DTU 3-phase timer 120 or 208 or 240Volt

See more 3-phase

High leg delta
Timer toggle between applainces
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Use Timer to toggle between appliances

240Volt circuit can be cut off by turning off one hot wire.
Put water heater on NC normally open terminal, so water heater is ON all the time, except when timer turns ON, and then circuit to dryer is activated.

Same wiring applies to many timers including Intermatic GE15000 series, Tork DTU40
Other timers can perform same operation such as Intermatic T1905 & T1975

How to wire 240Volt outlets

Tork DTU40 controls 2-speed pool pump
Always check pump voltage and wiring diagram located on nameplate
Pump operates continuously. Install another timer on L2 Hot line to turn pump ON-OFF

240 volt/ 2 speed pump

DTU40 controls 2-speed pump

Low speed is connected to NC terminal, and then pump operates continuously in low speed until timer turns ON.
When timer turns ON, High speed turns ON.
Diagram applies for both 120V and 240V 2-speed pool pumps.
Other timers can be used for 2-speed pool pump:

Intermatic GM40, GE 15207 series, T106 timer, T1906 timer

GM40 timer wired for 277 volts

277 volt/ 1 load

Wire DTU40 for 277 volt

Wire GM40 for two 277Volt loads

277 volt/ 2 loads

Wire DTU40 for two 277 volt loads
277 volt 3 phase timer
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277 volt/ from 3-phase

Wire DTU40 for 277 Volt to control 480 Volt
Control 3-phase contactor
Fused cut off required for 3-phase and timer in commercial applications
3-pole contactors at Amazon
Square D 30 amp 277V coil at Amazon
How to wire 3-phase timer

277-480 3-phase
277-480 3-phase service
GM40 timer

120 volt/ 1 Load

Wire DTU40 for 120Volt water heater

Timer automatically detects voltage
3 phase timer
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120 volt/ controls 3-phase

Use DTU40 to control 3-phase circuit

Most buildings with 3-phase also have 120Volt outlets.
Use 120volt to power timer. Wire timer as shown in illustration directly above.
Timer opens-closes circuit to 3-pole contactor with 120Volt coil.
Fused cut off required for 3-phase and timer in commercial applications
3-pole contactors at Amazon
Square D 40 amp 120V coil at Amazon

See more 3-phase

Element rated for 4500 watts @ 240Volt, will consume 25% or 1125 watts @ 120Volt

120 volt or 240 Volt/ toggle voltages

OFF peak

Wire DTU40 timer to toggle water heater between 120Volt and 240Volt.

Use this technique for peak electric prices.
When prices are peak, set water heater to opeate at 120 volts for slower heating. Tank stays hot, but hot water does not recover quickly.
When peak price ends, resume 240Volt operation for faster heat recovery inside tank.

Wiring inside water heater is not changed
Elements and thermostas will work wirh 120 or 240
This will not work for Whirlpool energy smart water heater
Off-peak water heater options
Intermatic IG1240RC3
Whole house surge
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Whole-house surge protector

Whole house surge protector

Digital timers need to be protected from surge.
Same with any water heater that is plugged into outlet.
All new appliances and water heaters with digital controls are vulnerable to surge

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Change water heater temperature using DTU40 timer

Applies to Intermatic WHQ timer and  GM40 timer and GE 15207 series timers and Intermatic T106 timer

240 Volt

Use timer for two different temperatures on electric water heater.

Either upper thermostat and element have power or lower themostat and element have power. But not both at same time.

Install ECO-protected thermostat for lower thermostat.
Both upper and lower parts of tank are ECO-protected from overheating
Rewire tank so upper and lower parts are separate.
Use GM40 timer to switch power between lower and upper parts of tank.

Normal operation, the lower thermost and element receive power and keep tank at temperature set point. Upper thermostat and element have no power.
This is called 'redundant' water heater operation. This technique for heating tank more rapidly after cold water first enters tank.

When timer activates, power to lower part of tank turns OFF. Power to upper part of tank begins. Upper thermostat is set for higher temperature.
Since tank is at regular temperature, the higher setting means upper element will turn ON and begin heating tank to higher set point.

Use this technique to heat water very hot for laundry cycle.
Disadvantage: The lower part of tank will cool rapidly as new cold water enters tank, so this technique is good for making short-term batches of hot water.
Tork DTU timer Off peak operation
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Tork DTU timer OFF peak

Wire water heater so lower part of tank is OFF during peak price times.
Less hot watger is available.
Tank is cooling during peak price, and probably will not run unless hot is drawn from tapm

9 ways to save with water heater
Off peak ideas

How to wire thermostats
How electric water heaters work
Control 2 water heaters
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Control 2 water heaters

Each water heater can have different 7-day schedule

10 gauge wire and 30 amp breaker run cooler.
30 amp circuit breaker and 10 gauge wire for water heater runs cooler with less energy loss. Breaker box lasts longer.

Different wiring:
For two 4500 watt water heaters, you can use one 40 amp breaker and 8 gauge wire to bring power from breaker box to the first timer.

For two 5500 watt water heaters, you can use 50 amp breaker and 6 gauge wire
Water heater timers
EH40 water heater timer
Things you can do to increase amount of hot water

9 ways to save with water heater


Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Multimeters at Amazon
Electric testers at Amazon 
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrcial repairs

Basic house wiring

Non-contact voltage tester

Test for power without touching connectorss
NEVER assume power is OFF

Non-contact voltage tester Amazon
Electric testers at Amazon
How to test electric power is off
wire connector assortment

Twist-on wire connector assortments

Do not reuse old connectors 

Connector assortment at Amazon
Connector assortment at Amazon

How to select and install twist-on wire connectors
Weatherproof wire connector

Weatherproof wire connector

Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
Buy from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

How to select and install twist-on wire connectors
Wire connector wrench

Wrench to apply wire connectors

Tighten connector 

Wire connector blaster
Twist connector wrenches at Amazon

How to twist wire
How to select and install twist-on wire connectors

linesman pliers
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
End cutting nippers at Amazon

Fire inside timer caused by stranded wire
Keep enclosure door closed at all times


Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Read about terminals

How to install terminals
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
Additional links:
Intermatic control centers Intermatic control centers:
+ manuals and parts

Including Z-wave
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