How to wire intermatic wh40 hot water heater timer

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2012

How to wire WH40 water heater timer/ EH40/ EH10/ WH21

Timers shown are safe for 1 residential water heater.
Photos of / more information about WH40 timer

WH40 timer is same timer as T104, except with external override lever
How to wire T104 timer

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Photos of / more information about WH40 timer
240V clock wires from back of timer connect to terminals 1&3
156T1978A tripper
WG1576 clock motor

WH40 water heater timer

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240V WH40 manual
120V WH21 manual
Timer rated 40 amp
10,000 watt capacity> can control one or two water heaters
How to set WH 40 timer
Troubleshoot Intermatic WH40 timer

WH40 timer can be wired many different ways: identical to T104
See more wiring diagrams for WH40 timer

How to set WH40 Video
	Manual override reverses current program until next tripper returns timer to regular schedule Photos of / more information about WH40 timer

Replacement tripper Pins and clock motors for WH40 and Intermatic
WH40 uses WG1573 clock motor
WH40 uses 156T1978A tripper
Clocks and trippers at Grainger

Troubleshoot Intermatic timer

EH40 water heater timer

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Terminals 1 and 2 power 240V electronic clock

EH40 water heater timer
240V EH40 manual
Programming for timer is on label located on inside of timer door.
7-day 7-programs
10 gauge wire, 30 amp breaker rated for 4500+ watt element
Timer rated 30 amp

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Basic water heater circuit

How to wire off-peak water heater

How to wire water heater thermostats

Romex connectors
How to twist wire
Wire nuts
Color code wire

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
EH10 operating and programming manual

How to wire Intermatic EH 10 timer for 120Volt water heater

Programming for timer is on label located on inside of timer door.
7-day 7-programs
Ground wires are kept away from other wiring.
Romex connectors used where wire enters metal box.
Tighten screws very tight against copper wire.

12 gauge wire, 20 amp breaker rated for 3500 watt element
Timer rated 30 amp

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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

romex connector

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

WG233-18 clock motor
156EB1945A trippers

WH21- larger image
WH21 / 23 amp water heater timer
WH21 manual
Troubleshoot WH21 timer
Figure volts amps watts for water heater

Color code wire

Romex connectors
How to twist wire
Wire nuts

What is difference between 120Volt and 240Volt?

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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

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.

Water heater Box timers

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Intermatic timers	Intermatic EH40 and WH40	Intermatic T-101 T103 T104	Intermatic T1906 and T1905
Troubleshoot Intermatic Intermatic parts	Intermatic Sprinkler timers	Pool timers and manuals	Timer for two water heaters

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