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How to wire off-delay timer
How to wire AH3-3 timer
AH3 off delay timer            AH3 off delay timer
Timer coil voltage 120V AC.
Contacts rated 3 amp at 240 Volt -or- 6 amp at 120 Volt
Volts 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 wirre 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.
Buy from my affiliate links
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 restat delay
If switch is turned off, then load remains off

Buy:
Panel mount fuse holders at Amazon
Ceramic fuses at Amazon
e2 fuseholder with platium 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 puch 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

Buy from my affiliate links:
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 occured 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 button

AH3 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.


Buy from my affiliate links:
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 platium plating
ANL fuses
AH3 delay timer and relay AH3 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

Buy from my affiliate links:
General purpose relay
AH3-3 at Amazon
Through wall fans

Through-wall fan
AH3 delay timer and relay
remote control countdown timer
Larger image
Remote control countdown timer
Buy:
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 countdown
Remote control countdown timer
Estimate 1/3 Hp
120V 60 Hz/ 10 watt miminum/ 1500 watt
Operate as ON-OFF or Countdown device/ Up to 500 feet
15 minute - 60 minute countdown
Buy:
Wireless wall mount transmitter TB-318 at Amazon
Wireless countdown receiver PA-318 at Amazon
Transmitter and receiver
Resource:
PA-318 manual
ST01 delay timer ON 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... sme 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 tunrs 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 tim 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 timer Repeated ON Delay using digital twin timer
How to wire twin timerTwin 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.
Buy:
Twin timers at Amazon
Twin timer Digital twin timer/ panel mount
PV shows the time left in the countup 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. Rudoph's nose will blink on and off as long as power is applied to red nose and timer.
Buy:
Twin timers at Amazon

Orange 10 gauge 30 amp


Orange/ #10 gauge for for 30 amp circuits including water heater
with ground
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp

NMB is house wiring
UF is underground
Yellow 12 gauge 20 amp


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

Roll stranded wire

NMB is house wiring
UF is underground
White 14 gauge 15 amp


White/ #14 gauge wire for 15 amp
with ground
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground

Copper ground wire
Use same size as other wire in circuit

Buy
Spools of ground wire
Ground rods at Amazon

Multimeter
Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Buy:
Multimeters at Amazon
Electric testers at Amazon 
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 electrcial repairs

Resource:
Basic house wiring

Non-contact voltage tester
Test for power without touching connectorss
NEVER assume power is OFF
Buy:

Non-contact voltage tester Amazon
Electric testers at Amazon 
Resource:
How to test electric power is off
Push on wire connectors
Push-on wire connectors in place of twist-on connectors
Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
wire connector assortment
Twist-on wire connector assortments
Do not reuse old connectors 
Buy

Connector assortment at Amazon
Connector assortment at Amazon

Resource
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
Buy from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

Resource
How to select and install twist-on wire connectors
Wire connector wrench
Wrench to apply wire connectors
Tighten connector 
Buy

Wire connector blaster
Twist connector wrenches at Amazon

Resources:
How to twist wire
How to select and install twist-on wire connectors

Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
Treminals
Terminals
Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Read about terminals

Resource:
How to install terminals

linesman pliers
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
End cutting nippers at Amazon


Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
Fire caused by stranded wire
Do not use stranded wire under screw plate
Applies to timers, switches, outlets, pumps etc.
Small devices, with small loads, such as lamp socket, stranded wire is fine
Add solder to 1" length of tightly twisted stranded wire to make into solid wire
Heat wire. Touch solder to wire. Let cool. File away over-solder.
Buy:
soldering guns
Resource

Timer caught fire

Troubleshoot Gas valves with manuals Icon gas valve

How to replace elements

Replace thermostats
How to wire tankless electric

Install point of use water heater
Titan tankless
Anode rods anode rods
Recirculation system Point of use water heater
Type 1 and type 2 surge protection surge protection
Gas and electric water heaters Buy
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Buy Tools
DEWALT
Black and Decker
Stanley
SKIL
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Fluke electrical testing
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Campbell Hausfeld air powered
Tekton automotive
Powerbuilt automotive
Saws and saw blades
Resource:
Compare box timers
DPDT timers
Intermatic
Control water heater w/ Z-wave

Intermatic control centers Resource:
Control centers:
+ manuals and parts


All control centers and parts

Including Z-wave
programmable timer Resource:
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