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2014

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

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
At Intermatic
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
Fuseholders

Up to 100 feet away
RC939 transmitter manual
Remote receiver manual
RC939 3-channel radio transmitter 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 screrw plate
Each wire must be same gauge
Attach multiple wires with wire nut, 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
10-2 wire at Amazon
Resources
Wiring diagrams: How to wire EH40
EH40 sell sheet
EH40 manual
At Intermatic
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 romex 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.
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 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
At Intermatic
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

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
Manuals/ Resource:
WH21 manual
Wiring and Troubleshoot WH21 timer
Intermatic trippers and parts
color-code household wire Color code wire

Romex connectors
How to twist wire
Wire nuts
 
What is 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
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.

Additional links
Intermatic parts
Intermatic trippers and parts
 Dayton Westinghouse timers
Westinghouse timers
Woods timers
Power pack
Gardena timers
Gardena T1030
Tork timers and manuals
Tork TU universal timer
Paragon timers and manuals
Tork TU universal timer
Westek box timers

How to set analog  timers
Sylvania timers

GE box timers
GE 15207 timer
3-phase timer
3-phase timer
Intermatic EH10 timer
EH10 timer

Tork pool timers and manuals
Intermatic timers
Intermatic GM series
Intermatic EH40 and WH40
  
Intermatic T-101 T103 T104
Intermatic T1906 and T1905
  
Troubleshoot Intermatic
Intermatic parts

Intermatic Sprinkler timers
Pool timers and manuals
Intermatic T104P201
Timer for two water heaters

 EJ500 Utilitec Woods Woods ST01C  ST01C ETW350 Aube T1032Aube Intermatic EI500Intermatic
Sylvania Tork GE  Leviton Hagar Power pack
Timex
Gas and electric water heaters Support the economy:
Buy water heaters  from my associate links:

50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

Resources:
How to install gas water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Intermatic control centers Intermatic control centers:
+ manuals and parts


Including Z-wave
box timers Compare box timers

Control with Z-wave
programmable timer Compare programmable timers

Control water heater with programmable wall timer
Countdown timers Compare countdown timers

Control water heater with countdown timer
Compare power packs

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