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Timer with remote control
Intermatic CA3750
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GE Z-wave contactor
Control water heater or pool pump with telephone or computer
DPST Both relays turn on-off at same time.
120 - 208 - 240 - 277 volt/ 40 amp
Range 50' indoor, 100' sight line outdoor.
Min temperature 4°F Max temperature 104°F
Metal outdoor box/ Nema3R
Different brands interoperate with other brands zwave
Buy
GE z-wave contactor
Zwave from GE
Zwave from Leviton
Zwave from Aeon

Resource
GE z-wave contactor manual
Timer with remote control
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............ K Henry wrote
This illustration "needs to come with a very big warning and potentially a modification in order to reduce the chance of someone being shocked or worse.  When you plug in one of the two plugs (that were spliced to the same pump, the other plug is now hot. You might have this in mind when you install the device, but in the future someone else or even yourself might not think of it as they unplug something, say to replace the timer.

If I did this, I would probably power the whole thing from a single extension cord, and tape everything together and put a label on it about the danger.  It isn't a foolproof solution and I am still uncomfortable with the double plug concept, but as long as you put it all together before plugging in that extension cord to energize it all, you'd have less of a chance of getting hurt."
http://waterheatertimer.org/Safe-electric-wiring.html
Timer with remote control
Not up to electrical code
Plug 120 volt load into both timer and remote.
Read pdf with specific electrical how-to

Timer turns 120V loan on-and-off in typical fashion.
When the remote is activated, another 120Volt circuit is opened to same 120V load.
Timer ON + Remote ON => Load ON
Timer ON + Remote OFF => Load ON
Timer OFF + Remote ON => Load ON
Timer OFF + Remote OFF => Load OFF

Remote can turn Load ON-and-OFF when timer is OFF
Remote cannot turn Load OFF when timer is ON.
Any switch-or-timer that turns OFF power to outlet, will also cause timer to stop rotating, and timer schedule will be delayed.
If timer is plugged into remote control, the timer will stop rotating each time remote is OFF, and timer schedule will be delayed
Buy:
Woods 32555 at Amazon
GE at Amazon
Wireless remote controls at Amazon
Replacement A23 battery at Amazon

Select recirculation pump
Resources:
See analog plug-in timers
See remote controls
Water heater recirculation system
Remote controls motor
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Use WiFi to control 120 or 240 volt motor
Buy from my associate links
Woods 32555 at Amazon
GE at Amazon
Wireless remote controls at Amazon
WeMo at Amazon
Belkin WeMo at Amazon
Contactor with 120 volt coil
Unlocked cell phone at Amazon
Unlocked smartphone

Resources:
How to set up wemo on your wifi network
How to control 240 volt with WeMo
remote control countdown timer
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Remote control countdown (delay) timer
Delay timer turns ON when remote control turns ON. Countdown begins, pump is ON. When delay period ends, timer turns OFF, Pump turns OFF.
Buy:
AH3 delay timer at Amazon
11-pin plug-in base at Amazon
General purpose relay
Woods 32555 remote at Amazon
GE remote at Amazon
Wireless remote controls at Amazon

Resources:
Select recirculation pump
How to wire delay timer
See remote controls
Water heater recirculation system
Control pump or any circuit 120-240 volt with 1 shot timer
This particular timer is called a twin timer ... and you set it to one shot mode

No voltage on push button lines.
Set time for .9 seconds to 99 hours.
Push button and reset the one-shot sequence.
One shot runs for duration of time, then turns off.
Input voltage on timer can be 120-240 volt.
Timer is rated 15 amp, and that is safe to put on 15-20-30 amp circuit.
To protect timer from surge in voltage or amperage commonly found with inductive loads like contactor and motor, add a 5 amp line fuse between the hot wire and terminal 9.
Buy: Project materials:
Twin timers at Amazon
Sestos twin timer
Omron DH48S twin timer
thermostat wire
Normally open Push button

Resource:
How to wire one shot timer

email for custom illustration of any type control circuit
geno03245w@gmail.com
ST01C timer controls 120Volt delay-off-timer

Activate off-delay timer using push button -or- using ST10 timer
Push button, or ST01, activates delay timer.
Push button gives momentary on-off to activate delay timer
When ST01 turns ON and then OFF, then delay timer activates
Delay timer turns Load ON
Delay timer begins countdown.
When countdown expires, delay timer turns Load Off
Buy:
6A855 Solid State timer at Amazon
11-pin plug-in base at Amazon
Contactor with 120volt coil
ST01 battery-operated timer
Resources:
6A855 Manual
More off-delay timers
Timer with remote controlAnd plug timer into remote control  Woods 49063 keychain timer Digital timer can plug into remote control without losing programming.
Example digital timer Woods 59337
 or Intermatic DT620
 or Intermatic PB series (with additional wiring)

Example remote control Woods 49063 or Woods 13568

Works opposite from Timer with remote control shown in first box above.
Remote can turn Load ON-and-OFF when timer is ON
Remote cannot turn Load ON when timer is OFF.
Resources:
More remote controls for home
Do not exceed rating for each device. Read label on 120Volt Load for watt rating. Read spec sheet for timer and for remote to make sure they can each handle watt rating of 120Volt load.
For example if 120Volt load is 1 light bulb, the watt rating is 100 watts. If 120Volt load is typical recirculation pump, then watt rating can be 29 watts. Check labels on each appliance, or tool, or water heater etc to find watt rating.
See analog plug-in timers
See remote controls
Woods 48554 outdoor timer  Westek TM21DOLB
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Timer with remote control: For outdoors.
Woods 48544
Works with photo eye or with remote control

Buy:
GE at Amazon
Westek TM21DOLB at Amazon
Same as GE 15143, GE YLT-15
Wireless remote controls at Amazon
Automatically turns lights on at dusk, timer turns off 2 to 8 hours later
Two 3-prong outlets.
Keychain remote also controls lights
Remote control is temporary override. After 12 hours, the timer function automatically resumes.
Resources:
Woods-49544-TM16-manual
Sell sheet
More remote controls for home
Skylink remote control countdown timer Skylink remote control programmable or countdown timer
Skylink PA-318 remote control countdown timer
Receiver can be operated as ON-OFF or Countdown device
Up to 500 feet open unobstructed distance 
Mim 10 watts
1500 watts, estimate 1/3 Hp

Buy:
Wireless wall mount transmitter TB-318    At Amazon
Wireless countdown receiver PA-318     At Amazon

Resources:
PA-318 manual
More remote controls for home
Intermatic RC939 controls timer    
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        RC939 transmitter                               RC613 receiver                      WH40 or T104 timer

Override 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

Resources:
RC939 transmitter manual
Remote receiver manual
RC939 3-channel radio transmitter at Amazon
Toggle water heater between 120Volt and 240Volt
GM40 timer
GM40 timer
Use this technique for peak electric prices.
When prices are peak, set water heater to operate at 120 volts for slower heating. Tank stays hot, but hot water does not recover quickly.
When peak price ends, resume 240Volt operation for faster heat recovery inside tank.

Wiring inside water heater is not changed
Elements and thermostats will work with 120 or 240


Resources:
Off-peak water heater options
How to wire GM40 timer
How to wire DTU40 timer
Timer and switch
Use switch to override timer
GM40 timerWhen the Hot wire to light is OFF, then light will not turn ON.
Timer programming will control light only when switch is ON.
Since switch does not turn timer on-off, then timer will continue to operate and keep correct time. 
When timer programming is OFF, then light will not turn ON using switch.

Resources:
GM40 timer wiring
GE 15207 wiring
Tork DTU40 wiring

More box timers and wiring
3-way switch and 3-way timer 
Either switch or timer controls light
The timer program runs at all times.
When 3-way switch is clicked, or timer override is clicked, then timer programming is reversed.
Light turns on-or-off as timer programming is reversed.

Resources:
How to wire Intermatic ST01C
How to wire GE 15312
How to wire timers
NO/NC contacts

Turn 1 load ON and other Load OFF at same moment
Example shows FM-1 analog timer used for 120Volt under-counter water heater.
Power is available for water heater or for dishwasher. But not both at same time.
Using this type of timer lets you have 2 appliances on same wire without tripping circuit breaker
Also lets you control precise hours when water heater is ON.

Resources:
FM-1 timer
How to install under counter water heater
cycle timer
CT2000 percent cycle timer
CT2000 cycle timer
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GM40 timer
GM40 timer
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Turn Load ON once every 10 minutes for 8 hours each day.
Or choose any timing schedule:

Set 120Volt cycle timer for chosen time duration. For example once per each 10 minutes. Or once each 5 seconds. The cycle timer dial rotates continually, and turns load ON-OFF for each cycle.

To operate the cycle timer at different hours, install 2nd timer.
The second timer can be installed 2 ways: 1) on the Hot line before the cycle timer. And then the second timer turns the cycle timer ON-and-OFF.

Or 2) the second timer can be installed as illustrated. The cycle timer runs continually. This lets operator schedule 1 cycle load, and run other cycle load continuously.
'Cycle timer' is name given to timers that typically operate in short time durations such as 10 minute repeating cycle, or 12 hour cycle instead of 24-hour cycle or 7-day cycle.
Cycle timers
Same as above except using FM1 timer module/
FM1 is available in 24-hour with 15 minute intervals, or 7-day with 2 hour intervals.
Also available in 12 hour time dial with 6-2/3 minute ON-OFF intervals.

Or use any digital timer with minimum 1 minute ON-OFF.
Or combine with ON delay or OFF delay timer.
Resources:
FM1 timer sell sheet with model numbers
FM1 timer module
Delay timers
Use any hard-wire timer to control contactor.

Hard-wire means that timer does not plug into outlet. Instead timer is hard wired or permanently wired to electric cable.
Any timer that replaces light switch is hard-wired timer.
Box timers are hard-wired
Image shows PB series timer connected with terminals

Timer controls contactor.
Magnetic contacts open and close.
This lets small-amp timer like the PB series control large-amp load like a motor

Resources:
PB series timers
Contactors
Wall switch timer controls contactor
Box timers
Terminals
Intermatic ET9000 series timer
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Intermatic 365 day timer: ET90000
4000 setpoints equals 5 ON and 5 OFF per each 24 hour day for each day of calendar year..
Each day of year can be different. Each week can be different. Each month can be different.
Choose Astronomic or 365 day timer / with holiday exceptions
Minimum 1 second on-off duration.
Up to 12 sets of timing relays, with option to add more relays.

Resources:
ET9000 instruction Manual
ET 90000 Sell sheet with wiring and box dimensions
ET 90000 sell sheet with features

Intermatic timers and manuals
How to wire Tork DTU40
Tork-DTU40
How to wire Intermatic GM40
Intermatic GM series
Intermatic EH10 and WH21
Intermatic EH40 and WH40
  
Intermatic T-101 T103 T104
Sylvania timers
Wifi
Zwave
Intermatic T104P201

GE box timers
Tork timer
Tork digital timers
Intermatic ET series
Intermatic ET104C
Intermatic pool timers
Tork pool timers
Intermatic T104P201
Troubleshoot Intermatic
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
How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
Resources:
Troubleshoot Gas valves with manuals
Icon gas valve

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
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Electronic parts

Industrial supplies

Tools and home improvement

Home and garden

Hayward pool
Pentair pool

Southwire electric
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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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