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How
to wire GM40
GM40AV
GM40AVE WHQ series DPDT timers/ all with indoor-outdoor Nema 3R enclosure Applies to Intermatic, GE, Tork, Woods |
GM40
 40 amp 120V-208V-240V-277V Dip switches to select voltage 7-day with 15 minute intervals or 24 hour with 1.75 hour intervals Buy Buy GM40 24 hour at Amazon Buy GM40 7-day at Amazon Buy: WHQ4 120-208-240-277Volt 24-hour at Amazon Resources GM40 instruction manual Sell sheet with model numbers How to set analog timers Intermatic timers and manuals |
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 Permanent ON-OFF override |
GM40AV
40 amp 120V-208V-240V-277V Automatically detects voltage 24 hour, 15 minute intervals Power outage backup option Buy: GM40AV 120-208-240-277V at Amazon GM40AVQ w/ back-up battery at Amazon Manuals/ Resource: GM40AV Manual GM40AV sell sheet |
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Permanent ON-OFF override |
GM40AVE
digital
40 amp 120V-208V-240V-277V Automatically detects voltage 7-day programmable, 20 on 20 off set points Power outage backup Buy: GM40AVE 120-208-240-277Volt at Amazon Manuals/Resources: GM40AVE manual GM40AVE sell sheet FM1D 20 setpoint programming FM2D 50 setpoint programming Intermatic timers and manuals |
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Woods Wifi 30 amp Woods 50054 WiFi contactor Auto detect voltage/ 120, 208, 240, 277 volt WiOn contactor connects to app on phone How to wire wifi Buy WiOn contactor from Amazon Resource: How to wire WiOn for 120 volt and 240 volt |
 Larger image Permanent ON-OFF override |
Woods
59402 40 amp 120V-208V-240V-277V Select voltage using jumpers 24 hour, 15 minute intervals Buy: Woods 59402 timer at Amazon Manuals/ resources Woods 59401 and 59402 manual Woods timers and manuals |
 GE timers and manuals |
Discontinued replace with
Tork TU or Intermatic GM40 GE 15135 40 amp 120V-208V-240V-277V Dip switches to select voltage 24 hour, 15 minute intervals Buy: GE 15135 24-hour/ 40 amp/ outdoor metal box at Amazon 56922 at Amazon Manuals/ Resources: GE 15207 manual How to wire GE indoor 15207 |
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Discontinued/
Replace with Tork DTU timer GE 15136 digital 40 amp 120V-208V-240V-277V Dip switches to select voltage 7-day programmable, 9 on 9 off set points, with countdown and random options3 month power outage back-up Buy: GE 15136/ 7 day/ 7 programs /40 amp/ outdoor metal box Resources: GE 15132 manual How to wire GE 15136 |
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Tork
TU series 40 amp 120V-208V-240V-277V Automatically detects voltage 24 hour 15 minute intervals Buy: Tork TU series DPDT/ 120-277V universal timer at Amazon Tork P1104-M 240Volt SPDT at Amazon Tork P1104FM 240V SPDT with fireman switch at Amazon Buy Tork DTU digital timer at Amazon Manuals/ Resources: Sell Sheet TU wiring manual TU instruction manual |
 Larger image Permanent ON-OFF override |
Tork
DTU
digital
40 amp 120V-208V-240V-277V Automatically detects voltage Replaces Intermatic GM40E 7-day programmable, 7 on 7 off set points, with random option. Power outage back-up Buy: DTU40 At Amazon Manuals/ resources DTU40 instruction manual |
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240
Volt and 208 volt Wire GM40 for 240Volt water heater Basic 240Volt wiring Turns OFF both hot wires going to load Resource More ways to wire for 240Volt Figure volts amps watts for water heater Wire size charts  |
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240
volt and 208 volt GM40 controls two 4500 watt 240Volt water heaters Turns off 1 hot wire to each water heater Use 50 amp breaker and 6 gauge wire to timer. 10 gauge ire to each water heater Timer not rated for controlling two 5500 watt water heaters Resource How water heaters work How to wire water heaters Figure volts amps watts for water heater Two water heaters Wire sizes |
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240
volt and 208 volt GM40 controls two 4500 watt 240Volt water heaters using dry terminals Set dip switches for 240Volt 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 Use two 30 amp breakers and 10 gauge wires when wiring two 240Volt water heaters with element wattage over 3800 watts. |
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240 volt and 208 volt GM40 controls two 240Volt water heaters One or other water heater is ON. Both heaters not ON at same time Use 10 gauge wire  Resource Two water heaters |
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120-208-240
volt 3-phase Example: High leg delta GM40 3-phase timer 120 or 208 or 240Volt 3-phase line and timer must have fused disconnect Resource See more 3-phase What is 3-phase  |
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Toggle
between 30 amp Loads Sometimes there are not enough circuit breakers for new 240 volt 3 HP irrigation motor. Use timer to toggle between 240 volt loads, and set timer to schedule irrigation pump. When pump is off, the water heater receives power. 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 when pump is Off. Same can be accomplished using 30 amp 3-way switch Buy: Leviton 3033-2 3-way switch at Amazon Leviton 3-way 30 amp switch Pass and Seymour 30 amp 3-way switch Dishwashers at Amazon Resource How to wire 240Volt outlets Motor resources Not enough circuit breakers |
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 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 or 208 volt
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: Resource T106 timer T1906 timer |
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277
volt Timers with automatic voltage detection do not have dip switches, and will detect 277 volt. GM 40: Set dip switches for 277Volt. Dip switches must be set before power is applied to timer  Wiring is identical to 120Volt, with Hot and Neutral. 277 volt is a derative of some commercial 3-phase 440 volt services, and does not apply to residential 120-240 volt services. Resource How to wire 3-phase timer What is 277 volt |
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277
volt Wire GM40 for two 277Volt loads Both loads turn ON-OFF at same time Do not exceed timer 40 amp rating Volts x Amps = Watts. Each electrical device has rating plate Resource Wire and breaker size charts |
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277
volt 3-phase Wire GM40 controls 3-phase Use 277V Or 480V contactor Fused fused safety switch, or disconnect, is required on 3-phase line and timer in typical installation.  Resource How to wire 3-phase timer See more 3-phase How to wire fused safety switch |
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120
volt Wire GM 40 for 120Volt water heater Set dip switches for 120Volt. Dip switches must be set before power is applied to timer  |
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120
volt 2 loads Both loads turn ON-OFF at same time Do not exceed timer 40 amp rating Volts x Amps = Watts. Each electrical device has rating plate |
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120
volt 3-phase
Use GM40 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. Resource See more 3-phase |
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GM 40 timer is NOT rated
for DC voltage, but can switch 24 DC volt line Wire GM40 timer to control DC motor: Use same diagram to control any single-phase voltage. Buy: Omron-DC-Power-Relay Resource: DC relays 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.  |
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Toggle between 120
volt or 240 Volt Off Peak Wire GM40 timer to toggle water heater between 120Volt and 240Volt. Wiring inside water heater is not changed Elements and thermostats will work with 120 or 240 This will not work for Whirlpool energy smart water heater, electronic water heaters, heat pumps, tankless, etc Use this technique for peak electric prices. When prices are peak, set water heater to operate at 120 volts for slower heating. Tank stays hot, but hot water does not recover quickly. Element rated for 4500 watts @ 240Volt, will consume 25% or 1125 watts @ 120Volt and heat water 1/4th as fast as 240 volt. When peak price ends, resume 240Volt operation for faster heat recovery inside tank. Resource Off-peak water heater options |
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Turn
Load ON once every 10 minutes for 8 hours per day Set 120Volt cycle timer for chosen time duration. For example once per each 10 minutes. Or once each 5 seconds. The cycle timer dial rotates continually, and turns load ON-OFF for each cycle. To operate the cycle timer at different hours, install GM40 timer. GM40 timer can be installed on the Hot line before or after the cycle timer. Resource Read more CT2000 cycle timer |
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Surge Resource Whole house surge protector How to wire whole house surge protector Digital timers should 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 using 2 EH40 timers 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 Resource Water heater timers EH40 water heater timer Things you can do to increase amount of hot water 9 ways to save with water heater |
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the economy: Buy water heaters from my associate links: 50 gallon Gas water heaters at Amazon 40 gallon gas water heaters at Amazon 50 gallon Electric water heaters at Amazon 40 gallon electric water heaters at Amazon Hybrid / heat pump/ water heaters at Amazon Resources: How to install gas water heater How to install electric water heater Troubleshoot gas water heater Troubleshoot electric water heater Point of use water heaters |
How to wire Tork DTU40 |
How to wire Intermatic GM40 |
Intermatic EH10 and WH21 |
Intermatic
EH40 and WH40 |
Intermatic T-101 T103 T104 |
Sylvania timers
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Pool timers and manuals |
 GE box timers |
Tork timer Tork digital timers  |
Intermatic ET series |
Pool timers and manuals Tork pool timers and manuals |
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Resource: Compare box timers DPDT timers Intermatic Control water heater w/ Z-wave |
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Resource: Programmable timers Countdown timers Off delay timers On delay timers Timer modules Din rail Twin & one-shot Woods Intermatic Tork |
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