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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 /
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
6-2 wire
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
multimeter
Buy:
Multimeter
Electrical testers
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

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
WH40 timer
How to set WH40
Intermatic RC939 controls timer  
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 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
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 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
EH40 water heater 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
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
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
EH10 water heater timer
  
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
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 Wire connector
10-2 wire at Amazon

EH10 & EH40 are battery operated timers
Battery compartment located beneath buttons
Size A battery lasts 2-3 years
40 amp water heater timers
Water heater timer for 2 water heaters
Two water heaters
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
Resources
WH21 manual
Wiring and Troubleshoot WH21 timer
Intermatic trippers and parts
color-code household wire Resources
Color code wire

Wire connectors
How to twist wire
Wire connectors
Difference between 120Volt and 240Volt?
main breaker box
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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.

Electricity from pole to breaker box
3-phase from power plant
Basic house wiring
Electricity is a wave that oscillates at 60 cycles per second. This is called 60 Hz.which appears on electric device labels.

Both Hot busbars are identical except out of phase with each other. 240Volt is like adding an extra cylinder to the engine, and gives added power.

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

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box timers Resource:
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Control water heater w/ Z-wave
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Intermatic control centers: and parts
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Point of use water heaters
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How to replace water heater element Waste King disposal
How to wire tankless electric


Install point of use water heater
Titan tankless

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

Woods timers
surge protection
Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
Install and troubleshoot garbage disposal Waste King disposal
Buy
Electronic parts

Industrial supplies

Tools and home improvement

Home and garden

Hayward pool
Pentair pool

Southwire electric
Buy
Tools

DEWALT
Black and Decker
Stanley
SKIL
Makita
Porter-Cable
Bosch

Irwin Hand tools
Klein hand tools
Fluke electrical testing
Dremel hobby tools

Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades
box timers Resource:
Compare box timers
DPDT timers
Intermatic
Control water heater w/ Z-wave
Intermatic control centers Resource:
Intermatic control centers: and parts
Digital control centers and parts
Tork control centers and parts
Subpanels
All control centers and parts
Enclosures
programmable timer Resource:
Programmable timers
Countdown timers
Off delay timers
On delay timers
Timer modules
Din rail
Twin & one-shot
Woods
Intermatic
Tork
Low voltage power packs Recirculation systems
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