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How to wire twin timer

AH3 off delay timer
AH3-3 delay timer and base
12-24-120-240 volt off delay timer/ 0-60 minutes
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120 volt AH3-3 at Amazon
Resources:
How to wire AH3-3 timer
How to wire H3CR timer
ICM102


ICM 102 on-delay timer
0 Hp Must use contactor
24/ 120-240 volt AC
.03-10 minutes
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ICM 102
Dayton off delay timers

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Use off delay to control motors
Dayton offv-delay timer
Off-delay timer/ 19-240 volt AC
15-300 seconds

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Dayton off delay timers

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How to wire Dayton off delay timer
DH48S twin timer
12-24-120-240 volt digital twin timer
1 second to 99 minutes
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Uxcell DH48S-S twin timer

Resource:
DH48S twin timer manual
Override air conditioner with timer
twin timer
12-24-120-240 volt digital off delay/ twin timer or one shot timer
.01 second to 99.99 hours
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Twin timers at Amazon
Sestos twin timer
Omron DH48S twin timers
Resource:
How to wire twin timers
How to wire one-shot timers
twin timer 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 Mode
To 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.

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 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.

You can pause the timer by connecting terminals 2 and 4, or reset timer by momentarily connecting terminals 4 and 3.
You can control power to the twin timer using a 7-day timer for example, or another twin timer, home automation device etc.
Twin timer

Panel mount digital twin timer

PV shows the time left in the count up for Mode B... so there is .78 seconds left before it switches to Mode A
SV 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 in repeat cycle mode 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.
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Twin timers at Amazon
Sestos twin timer
Omron DH48S twin timers

Resource:
Twin timer manual
Omron twin timer manual


Reset circuit
Do NOT apply power to terminals 1, 3, 4, 5
For Reset or Pause: ... momentarily connect terminals 2 and 5, or 3 and 5
Repeat cycle timer 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.
Poultry fan can turn ON for 20 minutes each hour.
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 or photo eye 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

Inkbird twin timerRepeated ON Delay using digital twin timer in cycle mode

Twin timer has two time periods that can turn a load on-off, on-off, on-off continually until power is turned off..... or reset to start point by momentarily connecting terminals 4 and 3.
Each time period can be same or different.
You set time period for mode A and then set time period for mode B
Time period ranges from .01 second to 99.99 seconds/ or .01 hour to 99.99 hours.
If seconds are chosen for time period A, then time period B must also be seconds.

Suppose you want a light bulb to turn on with switch and remain on, and also want a buzzer to sound 20 minutes later.
Then you want buzzer to turn OFF after 30 seconds. (the light bulb remains on)
Then you want buzzer to sound again 20 minutes later... and then turn OFF after 30 seconds.
Set twin timer for hours. Mode A is set for 00.30 and Mode B is set for 00.03
Operation sequence:
Move single-pole switch to ON position and light bulb turns ON and remains ON until switch is turned OFF.
First delay begins for 20 minutes. When delay period expires, the buzzer turns ON for 30 seconds.
Second delay ends after 30 seconds and Buzzer turns OFF. First delay period begins again
With a twin timer, the sequence keeps repeating until light switch is turned OFF.
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Twin timers at Amazon
Sestos twin timer
Omron DH48S twin timers
Twin timer manual
Omron twin timer manual
Din rail mount H5CX-A multi-finction digital twin timer
twin timer, interval
12-24-120-240 volt models
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H5CX-A twin timer 100-240 volt
Choose H5CX-A___-N for 24 volt

Resource:
H5CX manual
DHS48S twin timerDH48S twin timer
From the right, the 3rd and 6th buttons on front are for selecting time in seconds, .1 sec, minutes, .1 minute, hours, .1 hour.
Twin timers let you set two times. When one time is ON, the other if OFF, and then reverse.
The 1st and 2nd buttons are for selecting 1-99 seconds or minutes etc of first time.
The 4th and 5th buttons are for selecting 1-99 seconds or minutes etc of second time.

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DH48S twin timer

Resource:
DH48S twin timer manual
DH48S manual

Omron H3CR-F solid state twin timer
Independent on and off set times

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H3CR 12-48 volt DC
Omron twin timers

Resource:
H3CR-F manual DH48S twin timer
H3CR series manual
Add several layers of control using twin timer, delay timer and 24-hour or 7-day timer
Image show test wiring

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Din rails
THc15 timer
AH3 delay timer
Indicator lights

Resources:
How to wire delay timer
How to wire din rail timers + manuals
DH48S twin timer
DH48S twin timer wiring

Apply power to terminals 2 and 7 to activate repeat on-off operation of timer.
Timing sequence repeats until power is off.
Sequence resumes when power is applied again.


Reset pause One shot
Wiring can vary slightly by model
Do NOT apply power to terminals 1, 3, 4
For Reset or Pause or One shot activation: momentarily connect terminals 1 and 4, or 1 and 3
Override air conditioner thermostat *(or any circuit) using DH48S twin timer.
Note: the illustration shows twin timer terminals on opposite side from product manual. This was done for ease of making illustration.

Problem: air conditioner runs too much during peak electric prices. A programmable thermostat for the air conditioner can control peak usage by raising temperature and reducing hours of operation during peak times, but it cannot be programmed to limit actual number of run-time minutes per hour.

This diagram solves problem without compromising integrity of AC motor or equipment.
Steve says:
I've been able to make the DH48S-S (twin timer) work pretty well for my need of limiting the run time of air conditioning compressor.

My twin timer has a 24VAC coil so it I can hook it directly to the thermostat wires.  Here's how I wired it up:

Yellow (compressor) wire from tstat connected to terminal 7 (the 24vac coil)
Tstat common wire to terminal 2 (the 24vac coil)
Jumper from terminal 7 to terminal 8 (continue yellow wire to relay common)
Yellow wire going to air conditioner contactor connects to terminal 5 on twin timer (relay normally closed contact)

Set the time1 to 5 minutes (the "disallowed" off time")
Set the time2 to 10 minutes (the "allowed but limited to x minutes" on time)
So when the thermostat calls for cooling, putting 24 volt power on the yellow wire, it powers the timer and powers the relay, causing air conditioner to run for up to 10 minutes.  If the thermostat stops calling before 10 minutes, the twin timer is unpowered and when it calls again, it starts in the "allowed but limited" t2 at 00 minutes, and allows it to go to 10 minutes.  Beautiful!

I also have a second timer that is set to the peak hours of 3 to 8 pm and it bypasses the twin timer during those times.

Footnote about fuse:
The illustration shown above has the timer ON during regular prices, and OFF during peak pricing. If the fuse blows out, the timer will remain OFF. This means the twin timer will be in control of the AC cycle at all times, until a repair is made.
If the wiring is changed, so timer is OFF during regular price, and ON during peak, then if fuse blows, the AC will run normally even during peak pricing. To make this change in wiring, simply switch wires on terminals 3 and 5.
Use a 10 amp fuse to protect timer circuit. A fuse will protect the entire length of wire and the timers. The fuses rarely if ever blow out or have a problem.

Buy
Uxcell DH48S-S twin timer
24 volt twin timer
24 volt din rail timer
Panel mount fuse holders at Amazon
Fuse blocks at Amazon

Resource:
DH48S twin timer manual
24 volt timers
More wiring diagrams show how to override air conditioner
Din rail mount DH48S digital twin timer
twin timer or one-shot mode
12-24-120-240 volt models
Buy:
DH48S twin timer

Resource:
H5CX twin timer manual
How to wire one-shot timer/ 
identical wiring as twin timer
One shot timer: when power is applied, or signal is applied to timer, the timer turns ON circuit for selected time period then turns off.
One shot (on delay or off delay) - Set mode for one-shot: 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. Once you exit Mode, press RES button to set Time A and Time B.
Once you exit Mode, press RES button to set time A and then press RES again 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.
off-delay timer for recirculation system
Larger image
One shot timer application
Max load on off-delay timer is 10 amp.

How it works:
Push doorbell button. Activates timer. Timer turns ON and begins countdown. Timer terminals 7 and 8 are 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 thru 5.
How to wire twin timer

Buy: Project materials:
Twin timers at Amazon
Sestos twin timer
Omron DH48S twin timers
Sestos relay timer
Example 50' thermostat wire at Amazon
Contactor with 120Volt coil At Amazon
                 More contactor illustrations

                 More off delay and pin timer illustrations

Normally open Push button
off-delay timer for recirculation system
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
Push button
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.

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Leviton momentary contact switch
Momentary contact switches
Busman fuse holderPush button                 

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Normally open push buttons at Amazon
Normally open or monetary on push button
Fuseholders at Amazon
sestos B3sTwin timer  Panel mount one-shot timer
Precise digital control
Set mode for one-shot
Apply power, and normally open terminals turn ON for set time, and then remain off until power is cut and applied again.
This can be operated with a Normally closed push button that applies continuous power to the timer mechanism. When the push button is pushed, it starts the delay time circuit for the set duration of time.
Time durations: .01 seconds to 99hour99 minutes (4.16 days)
Repeasts each time power is applied again.

1/2 Hp @ 120 Volt
3/4 Hp @ 240 V
100-240 volt AC/DC input terminals are separate from output terminals
Buy:
B3S one-shot timer
Resource
B3S timer manual
Options for Motor driven countdown timer
Omron 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
8 pin timer wiring H3CR repeat cycle twin timer, or 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 5, with neutral connecting to terminal 2
How to wire AH3 timer
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