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How to wire EH10 water heater timer/ EH40/ WH40/ WH21
EH40
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EH10 120Volt timer
30 Amp resistive and inductive/ programmable/ SPST/ 1HP/ 5 amp tungsten
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 -40F to 104F/ 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

Reset timer using reset button before programming

Multimeter

Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Buy
Multimeters at Amazon
Electric testers at Amazon
Resource:
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrical repairs

Resource:
Basic house wiring

Non-contact voltage tester

Test for power without touching connectors
NEVER assume power is OFF
Buy:
Non-contact voltage tester Amazon
Electric testers at Amazon
Resource:
How to test electric power is off
wire connector assortment

Twist-on wire connector assortments

Do not reuse old connectors
Buy:
Connector assortment at Amazon
Connector assortment at Amazon
Resource
How to select and install twist-on wire connectors
Weatherproof wire connector

Weatherproof wire connector

Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
Buy from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

Resource
How to select and install connectors
Wire connector wrench
Wrench to apply wire connectors
Tighten connector

Buy:
Wire connector blaster
Twist connector wrenches at Amazon

Resources:
How to twist wire
How to select and install twist-on wire connectors

Buy:
Blue for 16-14 wire
Yellow for 12-10 wire

Resource:
How to install terminals
Treminals

Terminals

Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
remove cable staple
Buy
End cutting nippers at Amazon

 
linesman pliers
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
End cutting nippers at Amazon

Use solid copper wire
Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
Buy:
soldering guns
Resource

Timer caught fire
  
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.
Romex 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 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 at Amazon
12-2 wire at Amazon
Resources
EH10 manual
EH10 sell sheet
Figure volts amps watts for water heater
EH10 timer controls 240Volts
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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 romex connector
10-2 wire at Amazon

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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
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
Insdulation under screw plate
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Fire safety/ maximum 2 solid copper wires under screw plate
Max 2 wires under screws 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
EH10 & EH40 are battery operated timers
Battery compartment located beneath buttons
Size A battery lasts 2-3 years
EH 40 timer
EH40
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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
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
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<
WH 40 timer
WH40
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WH40 water heater timer
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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
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

WH40 timer
How to set WH40
WH21 timer

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
Manuals/ Resource:
WH21 manual
Wiring and Troubleshoot WH21 timer
Intermatic trippers and parts
color-code household wire Color code wire
How to twist wire
Wire connectors

Contactors/ relays
Type 1 and type 2 surge protection surge protection
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surge protection
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