How to wire Tork DTU40 timer

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2012

Tork digital timers and manuals

DTW/ DTU timer has typical wiring terminals found on Tork TU timers and Intermatic timers

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DTU40 instruction manual
Sell sheet with model numbers
NO dip switches.
Timer automatically detects voltage

AM and PM appear to right of minutes
A = AM; P = PM

Rating: SPDT; DPDT
Nema 3 indoor/outdoor enclosure
Up to 8ga AWG solid copper wire
Manual override on timer dial

DTU40 120 volt; 208-240; 277Volt/ 50-60 Hz
DTWH40 120-240Volt
NO contacts 40 amp resistive
NC contacts 30 amp resistive
1Hp 120V
2 Hp 208-240V

7-day timer
Minimum setting1 minute
Push button adjustment for daylight savings change
Manual override until next timer set point
Random mode
Backup battery is replaceable

Do not mix different gauge wires under same screws. Smaller wire comes loose, causing sparking and high heat and fire.
Do not mix solid wire and stranded wire under same screw.
Stranded wire will come loose as amperage heats and expands the connection, and then wires cool when power is off. Tighten screws very tight against copper wire.

Wire DTU40 timer to control DC motor:
Use same diagram to control any single-phase voltage.

240 Volt

Wire DTU40 for 240Volt water heater

Basic 240Volt wiring
Turns OFF both hot wires going to load

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

Figure volts amps watts for water heater

Wire size charts

240 volt

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.

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

120 volt

Wire DTU40 for 120Volt water heater

Timer automatically detects voltage

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120 volt

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.

See more 3-phase

120 volt or 240 Volt

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

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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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
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