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How to wire Intermatic GM40 series timer to control DC voltageApplies to GM40, GM40AV, GM40AVE, WHQ, GE 1500 series. Tork timers, Woods box timers |
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power to terminals L1 L2 Other terminals are 'dry'/ receive no power when L1 and L2 are energized Connect power to COM terminals NO normally open have no power when timer is OFF NC normally closed have power when timer is OFF  |
Wire GM40 timer to control DC motor:Use same diagram to control any single-phase voltage.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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240 VoltWire GM40 for 240Volt water heaterBasic 240Volt wiring Turns OFF both hot wires going to load  |
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240 volt and 208 voltGM40 controls two 4500 watt 240Volt water heatersTurns off 1 hot wire to each water heater Use 8 gauge wire to timer. 10 gauge ire to each water heater Timer not rated for controlling two 5500 watt water heaters |
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240 volt and 208 voltGM40 controls two 4500 watt 240Volt water heaters using dry terminalsSet 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 voltGM40 controls two 240Volt water heatersOne or other water heater is ON. Both heaters not ON at same time Use 10 gauge wire  Two water heaters |
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120-208-240 volt 3-phaseExample: High leg deltaGM40 3-phase timer 120 or 208 or 240Volt 3-phase lines amd timer must have fused disconnect See more 3-phase What is 3-phase  |
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120-240Volts appliancesUse Timer to toggle between appliances240Volt 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 |
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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 voltGM40 controls 2-speed pumpLow 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: Tork DTU40, GE 15207 series, T106 timer, T1906 timer |
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277 voltWire GM 40 for 277 volt Set dip switches for 277Volt. Dip switches must be set before power is applied to timer  Wiring is identical to 120Volt How to wire 3-phase timer |
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277 voltWire 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 Wire and breaker size charts |
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277 voltWire GM40 controls 3-phase Use 277V Or 480V contactor Fused disconnect required on 3-phase line and timer in most commercial applications  How to wire 3-phase timer See more 3-phase |
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120 voltWire 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 loadsBoth loads turn ON-OFF at same timeDo not exceed timer 40 amp rating Volts x Amps = Watts. Each electrical device has rating plate |
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120 voltUse 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. See more 3-phase |
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120 volt or 240 VoltWire GM40 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 |
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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. Read more CT2000 cycle timer |
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SurgeWhole house surge protectorHow 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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