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Override thermostat using programmable timer
Thermostat timer
override air conditioner with timerReduce run-time of air conditioner.
Problem: air conditioner runs too much during peak electric prices. 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.

The din rail timer is programmed so timer is ON during peak hours. Any programmable timer will do the job but din rail timers are available in both 120 and 240 volt models. And 12-24 volt also.

When the din rail  timer is ON, it turns ON a relay, and turns ON a twin timer.
When the din rail timer is OFF, the relay is OFF and the twin timer is OFF.

One of the 24 volt wires from thermostat is connected to the com terminal on one side of relay. When the din rail timer is OFF, the relay is OFF, and the 24 volt thermostat circuit is routed straight to the contactor for normal operation of air conditioner.

When the din rail timer is ON, the relay is ON, and it switches the 24 volt thermostat wire away from contactor and to the Twin timer.
The twin timer is rated for either 120 or 240 volt. Twin timer is designed to turn on-off-on-off-on-off in endless repeat cycle. ON times and OFF times are set independently, and can be any value between .01 second and 99.99 hours.
For example, the twin timer ON time can be set for 40 minutes. And OFF time set for 20 minutes. This limits the operation of air conditioner to 40 minutes.
During the 40 minute period, the twin time routes 24 volts to the air conditioner contactor for normal operation.

After 40 minutes, the twin timer cycles OFF, and then air conditioner cannot turn on for 20 minutes until the twin timer cycles back ON again. When the 20 minutes expires, the twin timer again lets the 24 volts complete circuit to contactor for 40 minutes.
The cycle of 40 ON and 20 OFF continues as long as din rail timer is ON. Set the din rail timer to turn ON during peak electric prices.

Illustration on right shows same diagram except pulling power off the 240 volt AC circuit. Use 10-15 amp inline fuse to protect timer and relay circuit from 50-60 amp air conditioner circuit. Use terminals to connect the smaller wires to contactor. Prevent loose connection and risk of fire: Do not put two different gauge wires under the screw plate on contactor. Never put stranded wire under screw plate.

Buy:
120-240 volt THC15 din rail timer

120 volt LY2 relay
240 volt relay

120-240 volt Twin timer

HVAC contactors
Inline fuse holders
Din rail fuse holder

Resources:
How to wire twin timer
Din rail timers and  manuals
Relays and contactors
contactorBasic contactor wiring:
Pull out the disconnect so electricity is OFF. Open wiring compartment on air conditioner. Use terminals to connect the smaller wires to line side of contactor. A capacitor will be connected to Load side of contactor.
Use 10-15 amp inline fuse on one of the two wires to protect timer and relay circuit from 50-60 amp air conditioner circuit. The fuse will protect entire length of circuit.
Prevent loose connection and risk of fire: Do not put two different gauge wires under the screw plate on contactor. Never put stranded wire under screw plate.

Buy:
HVAC contactors
Inline fuse holders
Din rail fuse holder

Resources:
Relays and contactors

Larger image
Intermatic enclosure 9-3 ⁄8" x 5-1 ⁄2" x 3-5 ⁄8"
Nema 3R outdoor Enclosure:
Nema3R Enclosures can be used for outside installation:
Image on left shows din rail timer, din rail fuseholder, and 3 relays mounted on the rail. Twin timer not shown.
Estimated height of twin timer on the rail is 4-1/2" tall. The box on left: twin timer is too tall and would be attached to side of enclosure.
Off-delay timers will fit in 3-5/8" space if mounted directly to metal box, and not din rail.

Bud Industries boxThe control box circuit shown on left is used for outdoor lighting. Twin timer and base are not shown.

Buy:
2T511GA Intermatic
Nema3R enclosures
Hoffman 8 x 6 x 4 Nema 3R
Hoffman 6x6x6
Bud industries 11x7x5 box without knockouts
Din rail
Resource:
Compare enclosures
Siemens volotage monitor
Larger image
Siemens Single-phase Voltage monitor
Rated 24-240 volt AC
Why use voltage monitor?
The problems of low voltage and phase fluctuation (lower voltage on one wire) do not affect resistance loads like light bubs or electric water heater, except to make them burn at dimmer capacity.
However low voltage and phase fluctuations do affect inductive loads like contactors, relays, motors, pumps, HVAC causing problems such as chatter on contactors and relays, and lower rotation speed on motor, causing higher temperatures, and burning out the motor or shortening motor lifespan.

Buy:
Single phase monitor

Resource:
How to wire phase monitors
ST01 timerOverride thermostat?
Add more programs to control furnace?
Use ST01 without any voltage, or with any voltage
I cannot say exactly which HVAC or thermostat wires you connect this to ../ for example the AC control board sends 24 volts to a contactor ... you can limit the times when the AC runs by cutting one of the wires, and insert ST01 as shown., but a programmable thermostat can do same job.

It might be possible to override the thermostat operation and turn power ON when thermostat calls for off.

The wire to ST10 does not need power, or it can have 12-24 AC/DC  or 120, 208, 240, 277 volt AC.

Timer red wire is capped. ST01 is programmable, or dusk-dawn timer. Dusk-dawn means timer is ON at night. Choose up to 6 on-off programs, or choose dusk-dawn. (either-or, not both)
If you connect timer red and blue wires together, then timer programming is reversed, so timer is ON in day and OFF at night, or timed programs are inverted.
You can simply cut a control wire, and insert ST01 as shown.
Timer red wire is capped.
If you connect timer red and blue wires, then timer programming is reversed... THIS means what?
ST01 is programmable, or dusk-dawn timer.Choose up to 6 on-off programs, or choose dusk-dawn. (either-or, not both) Dusk-dawn means timer is ON at night.
Use ST01 without any voltage, or with any voltage
Buy:
Intermatic ST01c timer at Amazon/ 1 year warranty
ST01C           
          Larger image             

CR2 battery  ST01 uses CR2 battery
Why can ST01 and Ei600 timers operate without voltage or control any voltage? Including 24 Volt AC/ DC or 120-208-240-277 volts

Because the timer is battery-operated. Battery lasts 2-3 years.
Because the timer does not need to be connected to 120 Volt AC or 240 Volt AC power to operate. Just the battery is needed
Timer can be located inside electric box, anywhere outdoors-or-indoors.

Buy ST01C white, ST01AC almond:
Intermatic ST01c timer/ 1 year warranty
ST01a almond

Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon


Resources:
How to program and wire ST01 timer
Use ST01 as 24 volt photoeye
Load ratings for Intermatic timers/ pdf
Load rating for ST01 timer: 120V ac, 6A, 208-277V ac; DC Loads 4A 12V dc, 2A 28V dc; Motors 1HP 120VAC, 2HP
240V ac, Ballast 16A 120V ac, 208-277V ac; Resistive 20A 120-277Vac.
Sellers of these products often don't know the numbers

ST01C is white, and ST01AC is almond... so if the seller is showing ST01, then timer is probably white.
http://waterheatertimer.org/pdf/067-ST01C-E1020.pdf

This is a very unique timer... can be used for many applications... motor control, photoeye, reverse photoeye, solar controller, HVAC controller, override any hardwired timer, stop doorbell from ringing certain times or day or all night
ST01 timer
Red-Blue-Black-green wires
LED display is not illuminated
How to wire ST01 timer
Connect 24 V AC to black wire
Connect Load to Blue wire
Cap off Red wire (red and blue connected, reverses timer programming)

Resource:
How to program and wire ST01 timer
Test ST01 timer
Testing the ST01 timer
Other uses for ST01 timer:
ST01 timer controls water heater or any 240 volt load
Reverse ST01 using Intermatic air switch   / Resource: Intermatic air switches
Use ST01C for 4-way timer
ST01 24 volt DC photoeye
Convert single-pole switch into 3-way switch using ST01/ Resource: How to add a switch   How to add 3-way switch
Use battery-operated ST01 timer for any voltage, or requires no voltage to operate, 24-hour, or 7-day, or dawn-dusk, or dusk-dawn,
Add a 3-way switch, or 3-way switch, or 4-way switch, used in place of photoeye, reverse photoeye, control 24 volt DC, turn off 12 volt doorbell when baby is sleeping, control motor load, control 3-phase, interface with delay timer

CN101A timer wiring
Larger image/ amico timer with dust cover

dust cover for amico timer
Dust cover
CN101 wiringCN101A timer
Amico panel mount timers
24 volt AC timer
7 day 17 on-off settings
To override thermostat.... Connect 24 VDC power to timer terminals located on right side
Connect thermostat wire to switch terminals located on left side....

Buy from my associate links:
24 volt AC timer
Amico 120 volt 7-day timer
12 Volt/ 16 amp/ DC timer at Amazon
24 Volt/ 16 amp/  DC timer at Amazon
Dust cover for Amico timers at Amazon
Amico timers at Amazon
Transformer: 120-240 Volt to selectable DC voltage

Resources:
CN101A/ amico timer manual/ pdf with wiring
How to wire amico timer
Terminals
ST01 timer ST01 timer can control motor loads/ no neutral wire needed
I recommend using relay for switch heavy-amp loads such as motors/ as shown in illustrations below
Buy ST01C white, ST01AC almond:
Intermatic ST01c timer/ 1 year warranty
ST01a almond

Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon
Timer for motor 24 volt timer for motor
Buy ST01C white, ST01AC almond:
Intermatic ST01c timer at Amazon/ 1 year warranty
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon


Buy:
24 volt transformer
24 volt AC coil/ 30 amp relay at Amazon
24 Volt AC coil/ 40 amp contacts
24 Volt AC coil/ 40 amp contacts
ST01 timer controls motor ST01 timer controls 120 volt motor
Install 10-15 amp line fuse to protect timer from overamp
Buy ST01C white, ST01AC almond:
Intermatic ST01c timer at Amazon/ 1 year warranty
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon


Buy relay:
120 volt coil/ SPST 30 amp relay
120 volt coil/ SPST 30 amp relay
120 volt coil/ SPDT 30 amp relay
12 amp DPDT Packard at Amazon
40 Amp DPDT relay at Amazon
Busman HKP-HH fuse holder Inline fuseholder
Buy inline fuseholder/ fuse block/ and fuse:
Panel mount fuse holders at Amazon
Buy fuseholder at Amazon
Buy fuseholders at Amazon

Fuse blocks at Amazon
30 amp fuseholder at Amazon
20 amp fuseholder at Amazon
Electrical terminals
Solder guns
Timer for motor Enclosed relays/ Functional devices
Requires neutral wire
Install 10-15 amp line fuse to protect timer from overamp
Functional relays, or enclosed relays shown here, are not as heavy-duty as open frame relays shown below.
Buy:
Enclosed relays at Amazon
120 volt coil/30 amp DPST


Heavy-duty open frame relay
Optional box and cover for Magnecraft
Recommend this relay for motors exceeding 120 volt 1 HP/ 240 volt 2 HP
Magnecraft/ Siemens relay with NO NC terminals 120 volt coil or 24 volt coil etc
These relay are heavy-duty and best for frequent-operation, long term control of motor
Buy from my affiliate links
Magnecraft box and cover
Magnecraft w199 relays at Amazon
Siemens power relays at Amazon

Resources:
How to reverse motor with switch
Difference between contactor and relay
Relays for DC motors and solar panels
Control motor with 2 switches
Start two motors at different times
Intermatic PB 800 series
Intermatic PB 800 series
Timer Modules
24-hour modules with trippers
Buy
120Volt at Amazon
240Volt at Amazon
Replacement trippers
Resources
Spa Module timers and manuals
Modules with segments
Buy:
120V at Amazon
240V at Amazon
Resources
Intermatic PB800-900 series
Intermatic timer modules
Wiring for timer modules shown on left

These modular timers have 4 terminals
2 terminals for clock motor
120V or 240V models

2 independent terminals for load
Any voltage, 120, 240, etc

Connect Hot from breaker to one of the clock terminals and to one of the load terminals,
Connect hot to load to other load terminals.
Connect neutral from breaker and neutral from load to other clock terminal.
wireless light kit
Larger image
B003OYJRB2
Leviton WSSLT-10 SLT Circuit Interlock Transmitter, 120VAC, White

Skylink anywhere wall switch
Buy:
Transmitter switch at Amazon
Receiver at Amazon
Resource:
Skylink wall switch manual
Skylink on-off-dim module manual
Skylink on-off module manual
Product information at Leviton
Aprilaire relay aprilaire relayWhen amp exceeds set point, the relay activates 120 volt circuit.
Use relay to control contactor when load exceeds 50 watts
Use to activate duct booster fan
Take off bracket and install bracket around a control wire that carries amperage.
 When amperage flows across line, the Aprilaire relay activates... and closes circuit going to 120 Volt load... such as indicator light... or another relay etc... the indicator light turns ON.
Buy
Aprilaire relay at Amazon
Current sensing relays

Resource:
Aprilaire manual .pdf

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 electrical repairs

Resource:
Basic house wiring

Non-contact voltage tester

Test for power without touching connectors
NEVER assume power is OFF
Buy:
Non-contact voltage tester Amazon
Electric testers at Amazon
Resource:
How to test electric power is off
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 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

Buy:
Blue for 16-14 wire
Yellow for 12-10 wire

Resource:
How to install terminals
Treminals

Terminals

Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
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
remove cable staple
Buy
End cutting nippers at Amazon

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

Use solid copper wire
Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
Buy:
soldering guns
Resource

Timer caught fire
main breaker box
Larger image
See inside main breaker box
Electricity leaves power plant What is 3-phase electric: power plant to end user
How to wire 3-phase timer

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
Install and troubleshoot garbage disposal Waste King disposal
Programmable timers

Woods timers
surge protection
Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
Type 1 and type 2 surge protection surge protection
Buy
Industrial electric

Industrial supplies

Tools and home improvement

Home and garden

Hayward pool
Pentair pool

Southwire electric
Buy
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
Enter Amazon from my links
Amazon

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