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Repair and maintenance of WH40
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How to wire 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 It is against code to use extension cord for permanent household wiring |
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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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 screw 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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40 amp water heater timers | |||
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Resources Color code wire Wire connectors How to twist wire Wire connectors |
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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. |
 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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Buy
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