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How to wire EH10 120 volt timer/
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How
to wire EH40 / 240 volt water heater timer/ How to wire EH10 120 volt timer/ |
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EH40 240Volt timer 30 Amp programmable/ DPST Minimum 1 minute set times Up to 6 on-off per week AA battery for backup and power-outage carryover 1 year limited warranty Override button located on face of timer. Temperature range -40ºF to 104ºF/ back-up battery will fail when exposed to freezing temperatures 7-3/4" high x 3" deep x 5" wide Use 10 gauge wire, 30 amp breaker rated for 4500+ watt element Inductive: 30 Amp, 240 VAC Resistive: 30 Amp, 240 VAC Tungsten: 5 Amp, 240 VAC 1 ½ HP, 240 VAC Reset timer using reset button before programming |
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EH40
water heater timer Wiring can vary because both wires are HOT: Jumpers can connect 2-3 -or- 2-5 etc. Different arrangement of wires Terminals 3-4 and 5-6 are simple on-off relay switches that activate when timer turns on-off. Terminals 1 and 2 are for powering the timer and relay switches. Relay switch terminals 3-4 and 5-6 are 'dry' and receive no voltage when power is connected to terminals 1 and 2... relay switch terminals are connected to terminals 1 and 2 as illustrated. Always connect ground wires together on the green ground screw. If wires are too short, but short length of wire and connect wires using wire connector. Attach wire or conduit to enclosure using clamp Buy: EH40 240Volt 7-day digital timer 30 amp timers 10-2 wire< Resources: EH40 sell sheet EH40 manual Figure volts amps watt for water heater Basic water heater circuit Color code wire Compare all box type water heater timers Compare 16 ways to control water heater |
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Jumper
wire connects two terminals 10 gauge wire, 30 amp breaker Timer rated 30 amp, 4500+ watt water heater EH40 does not have a connection terminal for Neutral. Keep end of wires straight. Clean wire ends with sandpaper if discolored Tighten screws very tight  |
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Neutral
wire? Does 240 volt circuit have a Neutral? Generally no, because both wires are Hot. But some 240 volt circuits have 12-3 wire with 2 Hots and a Neutral wire. If circuit has Neutral, then do not attach to screw terminal. Instead attach both Neutrals together with a wire connector inside the EH40 wiring compartment. Resources: See wiring for main breaker box Basic water heater circuit |
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Attach wire or conduit to
enclosure using clamp Keep enclosure door closed Keep plastic cover over wiring terminals unless power is OFF Use correct wire and breaker Buy: 10-2 wire Southwire electrical tools and wire Multimeter Electrical testers Resources: Select wire and breaker size Read about Wire connector |
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EH40 controls 2 water heaters/ same schedule Must use 2 separate 30 amp breakers Buy: EH40 240Volt 7-day digital timer Resources: 2 water heaters |
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Repair EH40? Resources: How to repair EH40 timer Use 24 hour mechanical timer Use ET series timer |
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EH40 controls 2 water heaters/ different schedules Override button located on face of timer Buy: EH40 240Volt 7-day digital timer Resources:> 2 water heaters |
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EH40 controls 120 volt load Use to power power-indicator light, pump, or any 120 volt load with same schedule as water heater Buy: EH40 240Volt 7-day digital timer Indicator lights High grade indicator Resources: Water heater recirculation system |
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EH40 off-peak water heater Use off peak strategy in conjunction with timer: Top of tank is heated while lower part of tank is off. Lets you use timer to produce some hot water during peak prices, without turning water heater completely off. \ Buy: EH40 240Volt 7-day digital timer Resources: How to wire off-peak water heater How to wire water heater thermostats |
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Fire
safety/ Do not use stranded wire under screw plate Stranded wire can come loose under screw plate, causing connection to heat up, and become fire hazard over time. Keep enclosure door closed. Attach stranded wire and solid wire with wire connector, and run solid copper jumper wire to screw terminal |
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No insulation under screw plate Use only solid copper wire Do not put insulation under screw terminal Take photo of wires before starting |
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Maximum 2 solid copper wires
under screw plate Max 2 wires under screw plate Each wire must be same gauge Attach multiple wires with wire connector, and run jumper to screw terminal Resources: Wire and breaker size charts |
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EH40
is battery operated timer Battery compartment located beneath buttons Size AA battery lasts 2-3 years Buy: Batteries Resources: How to repair EH40 timer |
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Optional
240 volt timer: WH40 Timer rated 40 amp.; 240 volt, commercial quality 24 hour mechanical timer 10,000 watt capacity> can control one or two water heaters WH40 timer is same as T104 and T104-20, except WH40 has external override lever Up to 12 on-off operations per day Manual override reverses current program until next tripper returns timer to regular schedule Buy: WH40 208-240-277Volt 10000 watt 40 amp T104-20 (WH40) 208-240-277V (no external switch) 156T1978 trippers Replacement trippers Clock motor WG1573 10-2 wire Resources: Wiring diagrams: How to wire WH40 WH40 manual WH40 sell sheet How to operate and set timer List of replacement parts |
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Optional
240 volt timer: WH21 25 amp, 240 volt. up to 5000watt water heater SPST 240Volt: turns off one hot wire. EH40 turns off both Hot wires Minimum 1/2 hour on-off times. On trippers cannot be set closer than 2 hours 25 amp controls Red indicator light is ON when Load is ON Buy: WH21 240Volt 23 amp 156EB1945a replacement trippers WH21 clock motor WG233-18 from Intermatic 10-2 wire Resources: WH21 manual Wiring and Troubleshoot WH21 timer Intermatic trippers and parts |
 Terminals 1 and 2 send power to 120V clock. Jumper hot wire from terminal 2 to terminal 3. Neutral wires connect to terminal 1 Ground wires are kept away from other wiring. Wire connectors used where wire enters metal box. Tighten screws very tight against copper wire.  |
120 volt timer: EH 10 timer for
120Volt 30 Amp digital timer DPDT Uses AA battery for backup Reset protocol for surge recovery Use whole-house surge protector 1 year limited warranty Minimum 1 minute set times Up to 6 on-off per week Buy: EH10 120Volt 7-day digital timer 12-2 wire Resources: Wiring diagrams: How to wire EH10 EH10 manual EH10 sell sheet Figure volts amps watts for water heater |
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Applies to 120 or 240 volt circuits Inductive loads like motors and pumps might require larger size to meet start amps Resistive loads like water heater and incandescent light bulbs do not consume more amperage at start up. Resources: Choose correct wire and breaker Wire connectors How to twist wire Wire connectors Basic house wiring |
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Resource: Compare box timers DPDT timers Intermatic Control water heater w/ Z-wave |
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Resource: Intermatic control centers: and parts Digital control centers and parts Tork control centers and parts Subpanels All control centers and parts |
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Recirculation systems |
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