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Repair and maintenance of WH40
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Intermatic Wh40 Electric
Water Heater timer Repair and maintenance of WH40 |
| Use only 600 volt wire. Lamp cord, extension cords are not rated 600 volt. Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional. 30 amp breaker use 10 gauge /  Buy: 10-2 gauge/ 30 amp 10-3/ 30 amp Southwire electric tools |
Yellow
12 gauge 20 amp Yellow/ #12 gauge wire for 20 amp with ground Buy: 12-2 gauge/ 20 amp 12-3/ 20 amp NMB is house wiring UF is underground Rolls of stranded wire |
White
14 gauge 15 amp White/ #14 gauge wire for 15 amp with ground Buy: 14-2 gauge/ 15 amp 14-3/ 15 amp NMB is house wiring UF is underground |
50-60
amp breaker use 6 gauge /  Buy: 6-2 wire Southwire electric tools NMB is house wiring UF is underground |
40-50
amp breaker use 8 gauge / Buy: 8-2 wire Southwire electric tools NMB is house wiring UF is underground |
  Copper ground wire Use same size as other wire in circuit Buy: 12 gauge copper ground wire Ground wire Green ground wire Ground pigtails Ground rods/ ground clamps at Amazon |
 Buy End cutting nippers at Amazon |
  When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point. Buy tools: Wire strippers at Amazon Linesman pliers Utility knife at Amazon |
 Buy: Multimeter Electrical testers |
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WH40
water heater timer Timer rated 40 amp 10,000 watt capacity> can control one or two water heaters WH40 timer can be wired many different ways: identical to T104 WH40 timer is same timer 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 at Amazon T104-20 (WH40) 208-240-277V (no external switch) at Amazon Buy repair parts 156T1978 trippers at Amazon Replacement trippers at Amazon Clock motor WG1573 at Amazon 10-2 wire at Amazon Resources Wiring diagrams: How to wire WH40 WH40 manual WH40 sell sheet How to operate and set timer List of replacement parts Photographs of timer and timer parts Troubleshoot Intermatic timer |
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Larger image RC939 transmitter RC613 receiver WH40 or T104 timer |
Override
WH40, T100 series timer with remote control Control 240Volt 3500 watt water heater using Intermatic RC 939 remote control and RC615 120Volt receiver 240Volt circuit can be turned off by turning off 1 hot wire Do not exceed amp rating of RC615, otherwise install RC613RC relay or PT1203M Up to 100 feet away Buy: RC939 3-channel radio transmitter at Amazon Resources Fuseholders RC939 transmitter manual Remote receiver manual |
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Fire
safety/ only solid copper wire
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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Fire
safety/ only solid copper wire 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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Fire
safety/ maximum 2 solid copper wires under screw plate Max 2 wires under screrw plate Each wire must be same gauge Attach multiple wires with wire connector, and run jumper to screw terminal Resource: Wire and breaker size charts |
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EH40
water
heater timer |
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EH40
water heater timer 240Volt water heater timer 30Amp digital timer/ SPDT 10 gauge wire, 30 amp breaker rated for 4500+ watt element 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 Override button located on face of timer Buy: EH40 240Volt 7-day digital timer at Amazon 30 amp timers 10-2 wire at Amazon Resources Wiring diagrams: How to wire EH40 EH40 sell sheet EH40 manual Basic water heater circuit How to wire off-peak water heater How to wire water heater thermostats Color code wire  Larger image off peak wiring |
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Jumper
wire connects two terminals 10 gauge wire, 30 amp breaker rated for 4500+ watt element Timer rated 30 amp 
 Select wire size Read about cable connector 10-2 wire at Amazon |
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EH10
water
heater timer |
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 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. |
How
to wire Intermatic EH 10 timer for 120Volt water heater 30Amp digital timer DPDT Uses AA battery for backup Reset protocol for surge recovery Use whold-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 at Amazon 12-2 wire at Amazon Resources Wiring diagrams: How to wire EH10 EH10 manual EH10 sell sheet Figure volts amps watts for water heater |
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EH10
timer controls 240Volt water heater 10 gauge wire, 30 amp breaker rated for 4500+ watt element Timer rated 30 amp
Select wire size Read about Wire connector 10-2 wire at Amazon |
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EH10
& EH40 are battery operated timers Battery compartment located beneath buttons Size A battery lasts 2-3 years |
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40 amp water heater timers | |||
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Water heater timer for 2 water heaters Two water heaters |
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WH21
25amp 240Volt Water heater timer Minimum 1/2 hour on-off times. On trippers cannot be set closer than 2 hours 25 amp controls up to 5000watt water heater SPST 240Volt Red indicator light is ON when Load is ON Buy: WH21 240Volt 23 amp at Amazon 156EB1945a replacement trippers at Amazon WH21 clock motor WG233-18 from Intermatic 10-2 wire at Amazon Resources WH21 manual Wiring and Troubleshoot WH21 timer Intermatic trippers and parts |
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Resources Color code wire Wire connectors How to twist wire Wire connectors |
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| Difference between 120Volt and 240Volt? | |||
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Difference
between 120V and 240Volt Inside main breaker box are Three busbars. One busbar is Neutral busbar. Two busbars are Hot busbars. Each Hot busbar is 'out of phase' with the other. All residential circuits require Two wires to complete circuit. 120Volt circuit requires 1 Neutral wire and 1 Hot wire. Hot wire can come from either Hot busbar. By Code, these wires are Black-Hot and White-Neutral. If either wire is interrupted, the circuit turns OFF. By code the Black Hot wire is switched ON-and-OFF. 240Volt circuit also requires 2 wires to complete circuit. In the case of 240V, the circuit requires 2 Hot wires. One Hot wire from each 'out of phase' busbar is required to complete 240Volt circuit. These wires can be Black and White or Black and Red, and with heavier gauge wires, like 6 gauge and 4 gauge, the wires are Black and Black. If either wire in 240V circuit is interrupted, the circuit turns OFF. See 30 amp switch turning off water heater Bare ground wire connects to Neutral busbar as redundant safety. |
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 Electricity from pole to breaker box 3-phase from power plant Basic house wiring |
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