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How to wire one-shot timer
Using twin timer set to one-shot modeOne shot timer: when power is applied, or signal is applied to timer, the timer turns ON circuit for selected period of time then turns off.
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How to wire one-shot timerUsing twin timer set to one-shot modeOne shot timer: when power is applied, or signal is applied to timer, the timer turns ON circuit for selected period of time then turns off. |
 AH3-3 delay timer and base 12-24-120-240 volt off delay timer/ 0-60 minutes Buy: 120 volt AH3-3 at Amazon Resources: How to wire AH3-3 timer How to wire H3CR timer |
 ICM 102 on-delay timer 0 Hp Must use contactor 24/ 120-240 volt AC .03-10 minutes Buy: ICM 102 Dayton off delay timers Resource: Use off delay to control motors |
 Off-delay timer/ 19-240 volt AC 15-300 seconds Buy Dayton off delay timers Resource: How to wire Dayton off delay timer |
 12-24-120-240 volt twin timer 1 second to 99 minutes Buy Uxcell DH48S-S twin timer Resource: DH48S twin timer manual Override air conditioner with timer |
 12-24-120-240 volt digital off delay/ twin timer or one shot timer .01 second to 99.99 hours Buy: Twin timers at Amazon Sestos twin timer Omron DH48S twin timer Resource: How to wire twin timers How to wire one-shot timers |
| One shot timer wiring Push momentary push button time to close circult between the 3 and 4 terminals |
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Load Max rated load on the timer is 10 amp. Using a relay will preserve life of timer since motor start-up pulls surge of amps through terminals 8-7 on the one-shot timer. How it works: Set twin timer to one shot mode ... instructions shown a few sections lower on page. Connect 120 or 240 volt AC power to terminals 8-7. Connect other wires as shown. Push doorbell button, or momentary switch, or use a spring-wound timer ... this will start the inkbird delay timer timer (do not energize the doorbell wires on start switch circuit with any voltage). Timer turns ON and begins countdown. Timer terminals 7 and 8 turn ON. This causes contactor coil to energize. Circuit to recirculation pump is ON. When countdown expires, terminals 7 and 8 are OFF, contactor coil is de-energized, pump turns OFF. Twin timer can be set to one-shot mode, and with 120-240V, and operate .9 seconds to 99 hours. So the pump can run any length of time: 1 hour or 21 minites etc. Do not connect power to terminals 1-5. How to wire twin timer Buy: Project materials: Twin timers at Amazon Sestos twin timer Omron DH48S twin timer Normally open Push button Example 50' thermostat wire Buy 1EJG9 relay at Amazon power relay 24v coil 30 amp enclosed power relay 25 amp Omron enclosed power relay More off delay and pin timer illustrations |
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Always use
contactor (or relay) to energize heavy amp load Why? So high amperage (and heat) does not flow through the timer ... instead the only amperage flowing through the relay located at terminals 8-7 will be to energize the 27 watt coil on contactor. Using a contactor will extend life of timer, and protect overall integrity of circuit. Suggest using a line fuse for power going to 9, and then jumper a wire from 9 to 8. This will ensure timer cannot be exposed to high amperage Buy: Contactor with 120Volt coil |
 Larger image | Use battery-operated, ST01 programmable timer. No power needed ... timer operates on battery.  Instructions
for wiring: run low voltage wires to ordinary electric box. Connect
blue and black wires to either low voltage wire. Cap off red wire. Then
program timer for on-off operation.Close front face on timer, then push to use it as override switch. Buy: Intermatic ST01c timer/ 1 year warranty ST01a almond Intermatic ST01K combination timer Ei600/ 5-year warranty timer CR2 replacement battery |
 Momentary contact switch Terminals 3-4 on the twin timer are for Reset. When terminals 3 and 4 are momentarily touched together using a momentary switch or a push button, it starts the recirculation pump. When the programmed time expires, the recirculation pump turns off, and the timer waits until the Reset is activated again. Do not apply power to terminals 3-4. For the reset to work, terminals 3 and 4 need to be joined or touched together and then disconnected from each other. If an ordinary on-off toggle switch is used instead of a momentary switch, the the toggle must be turned on and then off for the Reset to take place. Buy: Leviton momentary contact switch Momentary contact switches |
 Buy from my affiliate links Normally open push buttons Normally open or monetary on push button Fuseholders at Amazon |
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Choose Cycle (twin) timer or One
shot
timer mode Input voltage from 100-240 volt. Some models, 12-24 volt AC-DC input. Choose mode between One shot or Repeat-cycle. Timer has dry NO NC terminals, so you can connect any voltage to switch terminals.  Set
Repeat
cycle or One shot ModeTo set One Shot (also called: on delay, off delay, or countdown) - Apply power to timer. Press MD for 3 seconds. Press MD to choose settings: minute, second, hour. When t,nod appears, select the 4 dashes, then press and hold MD button for 3 seconds to exit Mode. To set times, the Lock mode must be OFF. Once you exit Mode, press RES button to set time A and then press MD to set Time B. If seconds are chosen for time period A, then time period B must also be seconds. One shot mode is either On delay or Off delay depending how timer is wired. After the time period expires, the load turns OFF or ON and remains ON or OFF until you reset by momentarily connecting and then disconnecting terminals 4 and 3 with a Normally open push button, or timer, home automation, etc... or reset timer by disconnecting and reconnecting power to timer. To set Repeat cycle (this is for a blinking application on-off-on- ... or a repeating either-or application - Apply power to timer. Press MD for 3 seconds. Press MD to chose settings: minute, second, hour. When t,nod appears, select the rectangle with dashes, then press and hold MD button for 3 seconds to exit Mode. To set times, the Lock mode must be OFF. Once you exit Mode, press RES button to set time A and then press MD to set Time B. If seconds are chosen for time period A, then time period B must also be seconds. For example a car alarm is a cycle or twin timer ... honk-honk-honk indefinitely until power is cut. Christmas displays, and blinking store lights etc use twin timer in repeat cycle mode. Timer starts when it receives power and stops when power is off. Then it restarts when power resumes. For example you can set the repeat cycle to turn on for 10 minutes and off for 99 minutes. Mode A would be 10 minutes, Mode B would be 99 minutes. Or ... turn on for 10 minutes and then turn on another circuit for 99 minutes. |
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Panel mount digital repeat cycle twin timer or one shotPV shows the time left in the count up for Mode B... so there is .78 seconds left before it switches to Mode ASV shows 2.99 ... which is the set time I choose for Mode B When 2.99 seconds ends, Mode A set time will display. Image shows the Inkbird twin timer. Use this timer to control red nose on Rudolph reindeer. Set Mode A to 30 seconds and Mode B for 2 seconds. Rudolph's nose will blink on and off as long as power is applied to red nose and timer. Buy: Twin timers at Amazon Omron twin timers Sestos relay timer Migro assorted timer Resource: Twin timer manual Omron twin timer manual |
 | Repeat cycle or one-shot mode Incoming power line connects to terminals 9 and 10. Timer begins on-off operation when power is ON. Control heavy amp load using contactor Irrigation pump can be set to run 30 seconds each hour Ventilation fan can be turned on for 15 minute intervals Add a second timer on incoming power line so timing function can take place during the day. Add rain sensor and relay to incoming power line so irrigation pump does not run after it rains. Buy 2-Pole 40A resistive 120Volt coil 40 amp 240Volt coil 24 volt coil Resource: Contactors How to wire twin timer |
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Add several layers of control using twin timer, delay
timer and 24-hour or 7-day timer Image show test wiring Buy Din rails THc15 timer AH3 delay timer Indicator lights Resources: How to wire delay timer How to wire din rail timers + manuals |
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H3CR-A
8-pin din-rail mount one-shot timer Select Mode J for one-shot.  Select Mode A on-off delay, B2 flicker start repeat cycle twin, E interval, J one-shot Select time period in seconds, minutes, hours or 10-hour increments Select time range using rated time selector: 100,000 operation life span Buy: H3CR timer Resource H3CR series manual |
 8-pin timer base Showing example SPDT pin timer wiring NC = Normally closed NO = Normally open |
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H3CR One-shot timer Select Mode J for one-shot Illustration shows typical 120Volt wiring.. Hot and Neutral connect to 2 and 7. Install jumper wire between 7 and 8 to put 120V to timer relay. When timer receives no power on terminals 7 and 2, then timer is OFF, then NC terminal 5 has power. When timer receives power to terminals 7 and 2, then timer is ON, and NO terminal 6 has power, and terminal 5 has no power. Complete circuit with neutrals at terminal 2 To use other terminals: Add jumper wire between 7 and 1 (or 8 and 1) Then connect load to terminals 4 or 3, with neutral connecting to terminal 2 How to wire AH3 timer How to wire H3CR timer |
 AH3
off delay/ or one shot
Boiler turns on.... relay turns ON Fan turns ON Boiler turns OFF... relay turns OFF Delay countdown begins Fan continues to run Fan turns OFF when countdown ends Use same design to provide air to Heat pump water heater General purpose relay with NO NC contacts needed. Choose coil voltage that can be controlled by boiler... for example 24 VAC etc Buy from my affiliate links: General purpose relay AH3-3 at Amazon Through wall fans LY2 power relay  
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DH48S twin timer used as one-shot It is possible to use this timer for one-shot application IF... Let's say you want a one-shot timer that turns ON a light while a machine is operating, and then light remains ON for 55 minutes afterwards before turning OFF. You select Minutes (M) for time A, and set time for 55. Then select Hours (H) for time B, and set for 99 hours. Then as long as the machine-and-light circuit turned ON again before the 99 Hours expires, the timer will function as a one-shot. Another example: You want outdoor light to turn ON normally at dusk using a dusk-dawn photoeye, but then light turns OFF 4 hours later. Select Hours (H) for time A, and set time for 4. Then select Hours (H) for time B, and set for 99 hours. Since the outdoor light turns ON again before the 99 hour expires, the DH48S will function as one-shot timer. Buy Uxcell DH48S-S twin time Resource: How to wire photoeye so it turns off after 4 hours |
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Resource: Compare box timers DPDT timers Intermatic Control water heater w/ Z-wave |
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Resource: Programmable timers Countdown timers Off delay timers On delay timers Timer modules Din rail Twin & one-shot Woods Intermatic Tork |
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Recirculation systems |
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