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How to wire off-delay timer
How to wire AH3-3 timer

Multimeter

Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
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Resource:
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrical repairs

Resource:
Basic house wiring

Non-contact voltage tester

Test for power without touching connectors
NEVER assume power is OFF
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Resource:
How to test electric power is off
wire connector assortment

Twist-on wire connector assortments

Do not reuse old connectors
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Connector assortment at Amazon
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How to select and install twist-on wire connectors
Weatherproof wire connector

Weatherproof wire connector

Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
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Weatherproof size 22 to 8 Amazon

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How to select and install connectors
Wire connector wrench
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Tighten connector

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How to twist wire
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Blue for 16-14 wire
Yellow for 12-10 wire

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How to install terminals
Treminals

Terminals

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Blue for 16-14 wire
Yellow for 12-10 wire
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

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Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
remove cable staple
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linesman pliers
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Use solid copper wire
Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
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soldering guns
Resource

Timer caught fire

How to wire contactors/ relays
Busman HKP-HH fuse holder
How to wire inline fuseholder
AH3 off delay timer
How to wire delay timers
How to wire twin timers
AH3 off delay timer           
Timer coil voltage 120V AC.
Contacts rated 3 amp at 240 Volt -or- 6 amp at 120 Volt
AH3 off delay timerVolts x amps = watts/ 6 amp x 120 volt =  720 watts
Max 1/4 HP: bath fans are usually 1/6 Hp or 1/3 Hp. Recirculation pumps 1/25 Hp.
1/3 Hp attic fans are probably to large amp draw for this timer to operate long-term.
For long term, keep load amp draw smaller than load rating... or connect timer to contactor
AH3-3 timer
Can be used as relay, ON-delay, OFF delay, or all 3 at same time.
0-60 minute settings are approximate... experiment to fine tune setting.
8-pin base included with 8 screw terminals. Remove timer from base to attach wires.
Recommend tightening screw plates very tight against wire, especially if using stranded wire.
Stranded wire can become solid wire by adding solder.
Solid wire is not fire hazard. Stranded wire is greater fire hazard when under screw plate.
Size: 2-1/2" tall with base included  x 1-5/8" x 2"
120 volt off delay timer/ Contacts rate 120-208-240 Volt
Rated for all loads incandescent (Tungsten), LED, CFL, resistive, inductive etc
Rated 3 amp @ 240 volt -or- 6 amp @ 120 volt/ Up to 1/4 Hp @ 120 Volt
120 volts x 6 amps = 720 watt.
Bath fans are OK at 1/6 Hp/ Attic fans can run 1/3 to 1/2 Hp... suggest use contactor to carry load
Recirculation pumps are 1/25 Hp and delay timer works fine.
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AH3 timers at Amazon

Resources:
Use off-delay to control recirculation pump
Use off delay to control motors
Fuseholders
Omron H3CR sell sheet and wiring
AH3-3 wiring Off delay/ 120 volt
Off delay means the load turns ON immediately, and then load turns off after delay time expires.

3-way switch is convenient
Any switch position will start the delay
Click switch up starts delay... click switch down starts delay
Load turns off after delay period expires

Why the 3-way switch diagram works... because the switch is ON full time.
When the timer receives power... the load turns ON until delay period expires... but timer is still receiving power. If you temporarily stop power from going to timer, by clicking the 3-way switch to another position, then the timer resets, the light turns ON again until the delay period expires.
Load remains OFF until power is stopped and started again.

If you use single-pole switch... then the switch must be turned off and then back on to restart delay.
If single-pole switch is turned off, then load remains off
AH3 timer wiring Off delay/ 120 volt/ variant
Same result as above... different wiring.
This design lets you run smaller wire to switch... for example 18 gauge lamp cord.
Smaller wire allows easier wiring going to remote switch.
Add line fuse to if you are using smaller wire
Off delay means the load turns ON immediately, and then load turns off after delay time expires.

3-way switch is convenient
Any switch position will start the delay
Click switch up starts delay... click switch down starts delay
Load turns off after delay period expires

If you use single-pole switch... then the switch must be turned off and then back on to restart delay
If switch is turned off, then load remains off

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Panel mount fuse holders at Amazon
Ceramic fuses at Amazon
e2 fuseholder with platinum plating
ANL fuseholder and fuses

Resources
More about fuseholder
delay timer with push button Off delay/ NC push buttons added to circuit
NC means normally closed... or the power is ON until button is pushed
Compare: doorbell button is NO ... or power is off until button pushed

Add as many NC push buttons as desired for remote operation
As long as each push button is functioning correctly, the circuit works fine.

Why it works...
Power is ON continually at timer.
When power is interrupted, and then restarted, the timer turns load ON and delay period starts.
When delay period expires, the load turns OFF. Power remains On at the timer
When push button is pushed again, the power is temporarily stopped to timer, and the cycle repeats

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Normally closed push button switch at Amazon
AH3-3 at Amazon
delay timer wiring Off delay/ 120 volt/ same as variant above
Illustration shows 18 gauge wire going to remote switch
Fuse and fuseholder are used to protect 18 gauge wire from overload.

Why is the fuse required?
Assume 120 Volt Hot that powers circuit is connected to 20 amp breaker.
18 gauge wire is not rated for 20 amp breaker.
Larger 12 gauge wire is used with 20 amp breaker

If a short circuit occurred somewhere along the 18 gauge wire, then the full 20 amps would pour into the small wire. This would cause wire to overheat. Overheated wire will melt and cause fire.
To prevent fire and overheating hazard, add 5-10 amp inline fuse.
The fuse can be installed anywhere along the 18 gauge wire, and will protect full length of wire.

Diagram shows ordinary rocker switch.
Use 3-way switch for easiest installation. Read descriptions above about 3-way switch.
AH3 delay timer wiring with push buttonAH3 off delay timer wiring with push button
No switch is used... only NC push button switches are present
Add a many NC push buttons as desired
Locate push buttons in each bathroom... press button and recirculation pump starts
Hot water immediately circulates toward bathroom
When delay period ends, recirculation pump turns OFF

The power is ON at timer.
When Normally Closed NC button is pushed, the power to timer stops momentarily.
Power resumes as soon as button is released, the timer delay period begins, and load turns ON.
Once delay period expires, light turns OFF. Power is still ON at timer.


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Normally closed push button switch at Amazon
AH3-3 at Amazon
Panel mount fuse holders at Amazon
Fuse blocks at Amazon
Ceramic fuses at Amazon

E2 fuseholder with platinum plating
ANL fuses
AH3 delay timer and relayAH3 off delay
Wall fan turns OFF after boiler turns OFF
Use same design to provide air to Heat pump water heater
Additional general purpose relay with NO NC contacts needed.
Choose coil voltage that can be controlled by boiler... for example 24 VAC etc

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

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General purpose relay
AH3-3 at Amazon
Through wall fans



AH3 delay timer and relay
Through-wall fan
Larger image
remote control countdown timerRemote control countdown timer
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120 volt AH3-3 with base at Amazon
6A855 Solid State delay timer at Amazon
11-pin plug-in base at Amazon
Woods 32555 at Amazon
GE remote at Amazon
Wireless remote controls at Amazon
Replacement A23 battery at Amazon

Select recirculation pump
Resources:
How to wire AH3-3 timer
See analog plug-in timers
See remote controls
Water heater recirculation system
Skylink remote control countdown timer
Skylink wireless countdownRemote control countdown timer
Estimate 1/3 Hp
120V 60 Hz/ 10 watt minimum/ 1500 watt
Operate as ON-OFF or Countdown device/ Up to 500 feet
15 minute - 60 minute countdown
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Wireless wall mount transmitter TB-318 at Amazon
Wireless countdown receiver PA-318 at Amazon
Transmitter and receiver
Resource:
PA-318 manual
ST01 delay timerON Delay
Illustration shows ON delay wiring.
On delay means the load turns ON after delay period expires. Load remains ON until power is off.
Example uses ST01 timer as switch. (Or use Ei600... same timer with 5-year warranty)

ST01 Timer can be set for dusk-dawn. Automatically turns lights ON at night, and off at dusk.
ST01 Timer automatically adjusts for seasonal changes.
ST01 Timer can be adjusted 20 minutes longer or shorter than actual dusk-dawn

However some folks want longer delay before lights turn ON at night
How it works:
ST01 Timer turns ON. AH3 timer receives power. Time delay countdown begins.
After delay period expires, light turns ON, and remains ON until ST01 timer turns OFF
Cycle repeats next time the ST01 timer turns ON.
Buy:
Intermatic ST01 timer<
Ei600 timer at Amazon
CR2 replacement battery at Amazon
Resource:
Intermatic ST01 timer and manual
How to wire and program ST01 timer
On delay means. When power is applied to terminals 2 and 7, the delay countdown begins.
After the delay period expires, then load turns on and remains on as long as terminals 2 and 7 have power
ah3-3 on delay timer
ON Delay
Move single-pole switch to ON position and shop light turns ON
Delay begins
When delay period expires, the buzzer turns ON

Buzzer remains ON, until switch is moved to OFF position

Inkbird twin timerRepeated ON Delay using digital twin timer
How to wire twin timer has two time periods that turn on-off indefinitely.
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 to 99.99 seconds/ or .01 to 99.99 hours.
If seconds are chosen for time period A, then time period B must also be seconds.

Suppose you want light to turn on with switch, and want a buzzer to sound 20 minutes later.
Then you want buzzer to turn OFF after 30 seconds.
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 shop light 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
Twin timer Digital twin timer/ panel mount
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 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

Resource:
How to wire twin and one-shot timers
30 amp breaker use 10 gauge /


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10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp


Yellow/ #12 gauge wire for 20 amp
with ground
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12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
White 14 gauge 15 amp


White/ #14 gauge wire for 15 amp
with ground
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14-3/ 15 amp

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armored cable
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Southwire armored cable cutter
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Rolls of stranded wire

Stranded wire
stranded wire
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Rolls of stranded wire
50-60 amp breaker use 6 gauge /
6-2 wire
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6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
6-2 wire
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8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
    
Copper ground wire
Use same size as other wire in circuit

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Ground wire
Green ground wire
Ground pigtails
Ground rods/ ground clamps at Amazon

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box timers Resource:
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Control water heater w/ Z-wave
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Intermatic control centers: and parts
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