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How to wire Intermatic ET series timer

These timers can be wired many different ways
Intermatic ET104C
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ET104C Manual

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Fig 1
ET104C water heater timer
ET104C 24-hour timer
Wired for 240 Volt

ET104 24-hour timer with 4-ON and 4-OFF per day
Buy ET1100 series for 24-hour 14-ON and 14-OFF per day

ET104C has selectable voltage that is preset to 240Volts
Selectable voltage 120 208 240 277

Same illustration applies to ET173 and ET174 7-day timers
Intermatic ET104C Fig 2
ET104C or ET102 24-hour timers
Wired for 120 or 240Volts

ET104 has 6 terminals, and ET102 has four terminals
ET104C and ET102 have selectable voltage that is preset to 240Volts
ET 170 series manual
7 day programmable
Read manual to set jumpers for selectable voltage
Selectable voltage 120 208 240 277
Wiring
ET173C and ET174C have 6 terminals and wire same as Fig 1 shown above
ET175C has 5 terminals and wires same as Fig 6 shown below
ET270 series manual
7 day programmable
2 independent outlets
120Volt timer
2 channel timer with selectable voltage
Can operate 2 Loads with different schedule for each Load
Maintained or momentary bell-ringing contacts
Wiring
Read manual for specific wiring options
Wiring is similar to diagrams shown here but the 2-channel option complicates summary drawings.
ET1100 series manual
24 hour
14-ON and 14-OFF
Selectable voltage 120 208 240 277
Read manual for PUL and SIM jumper
2-second pulse for mechanically held contactor = PUL
Multiple Load simultaneously = SIM
Independent Loads = IND (ET1125 only)
Wiring
ET1105 has 4 terminals and is wired like Fig shown above
ET1115 has NO and NC terminals and is wired like Fig 6 shown below
ET1125 has 6 terminals and is wired like Fig 1 shown above
ET 8000 series manual
Astromic dawn-dusk timer is not necessarily best choice for water heater timer
Selectable voltage 120 208 240 277Wiring
ET8015 has 4 terminals and wire same as ET102 Fig 2 shown above
ET8215 ET has 6 terminals and wire same as Fig 1 shown above

ET8115 has NO NC terminals same as Fig 6 shown below
Many other wiring variations are possible
Fig 6
ET7015 7-day timer  
Five-terminal timer wired for 240 Volts

Selectable voltage 120 208 240 277

What do NO NC terminals mean?
NO NC terminals explained
:
NO terminal is Normally Open, this terminal receives power ONLY when timer turns on
NC terminal is Normally Closed, this terminal receives power and is on at all times EXCEPT when timer turns on, and then the NC turns off.

Intermatic 70815-71615 Manual
24 volt ET70815CR24 and ET71615CR24
Or selectable voltage ET70815CR and ET71615CR.
4 channel ET70615 or 8 channel ET70815.
24-Hour, 7-day, 365-day optional pulse, fixed switch, astronomic, interval, short-duration, timer with 8-year battery, with isolated NO and NC terminals that allow switching any voltage no matter which timer power voltage is selected.
Each channel can have different timing schedule.
Each channel can control any voltage, and voltage can be different for each channel.
Replaceable logic module
Wiring
Read manual for specific wiring options.
Wiring is similar to diagrams shown here but the 2-channel option complicates summary drawings.
ET70815CR ET70815CR24Intermatic-et71615cr
Other ET timers.
ET series plug-in type timers by UPM
Paragon ET series
Grasslin ET616
Additional links
Woods power pack Kitchler power packs Kitchler power packs
Kitchler lights
Paradise transformer Paradise GL22007 transformer
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Tork TU universal timer
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