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3-Way Switch Setup

NOTE: 

The distance between switch timer and remote switch must 

not exceed 100 feet.

1.  Locate the COMMON wire connected to fi rst old switch. It might 

be attached to a different colored screw, or fi nd markings on old 

switch.

2.  Connect BLACK wire from switch timer to

 

COMMON wire, using a twist connector.

3.  Connect the other two wires from the old 

 

switch to the blue and re wires from the timer.

4.  Connect green wire to grounding screw in the box. 

If plastic box, connect to ground.

5.  Remove wire “C” from the “Common” terminal of 

the existing remote switch. 

6.  Reconnect wires “B” and “C” to the common termi-

nal of your remote switch, using the supplied piece 

of jumper

 

wire. If using a new single-pole remote 

switch. See diagram 3. 

NOTE:

 For new construction or replacing a dimmer switch, a lighted switch, or a 3-way 

switch without screw terminals, a single-pole switch can be used at the remote location. If 

unable to determine the proper wire colors, choose one of the wires and connect as wire B. 

After the installation is complete, if the controlled light or device will not turn on properly, 

reverse wires “A” and “B”. See Steps 11 and 12 for how to check. 

7.  Tuck wires into the timer wall box leaving room for the timer. 

8.  Using screws provided, mount the switch timer into the wall box, and install wall plate.

9.  Install the remote 3-way switch in its box and install wall plate. Turn power ON.

10. Make sure 

MAN

 mode appears. 

11. Press 

ON/OFF

 button on the switch timer several times. Each time you push the 

ON/

OFF

 button, the switch timer should ‘“click” and the controlled light or device (the “load”) 

should turn on or off. If so, proceed to Step12

.

 

-  If timer clicks but load does activate, check wiring and make sure load is functional.

 - 

If the timer clicks but the load only operates when the remote switch is in one of its 

2 positions, you need to turn off the power at the service panel, then reverse wires 

“A” and “B”. You can reverse wires “A” and “B” at the remote switch wall box, or you 

can reverse wires “A” and “B” where they connect to the red and blue wires of the 

switch timer. Then turn power back on at the service panel and repeat Step 11.

12

Verify the controlled load turns on or off each time the remote switch is operated. 

Multiple Time Switch Setup

Multiswitch applications using the ST01 timer are wired differently than conventional 

toggle switches. Read the following installatin instructions carefully. 

• 

Multiple timers may be mounted in an unlimited number of adjacent junction box slots

•  

No derating is required for multiple switch timers.

BLACK WIRE

BLUE WIRE

RED WIRE

(capped, not connected)

RED WIRE

BLUE WIRE

BLACK WIRE

WIRE FROM

“COMMON” OF

OLD SWITCH

DIAGRAM 1:

TYPICAL 

EXISTING 

2-SWITCH

SETUP

LOAD

NEUTRAL

3-WAY 

MAIN SWITCH

WIRE “A”

“COMMON” TERMINAL

LINE

3-WAY 

REMOTE SWITCH

WIRE “B”

WIRE “C”

DIAGRAM 2:

2-SWITCH SETUP,

TIMER INSTALL

RE-USING EXISTING

REMOTE 3-WAY SWITCH

LOAD

NEUTRAL

WIRE “A”

“COMMON” TERMINAL

LINE

3-WAY 

REMOTE SWITCH

WIRE “B”

NOT USED

BLACK

TIMER

BLUE

RED

WIRE “C”

JUMPER

DIAGRAM 3:

2-SWITCH SETUP,

TIMER INSTALL USING 

NEW SINGLE-POLE 

REMOTE SWITCH

LOAD

NEUTRAL

WIRE “A”

LINE

SINGLE-POLE REMOTE SWITCH

WIRE “B”

BLACK

TIMER

BLUE

RED

WIRE “C”

JUMPER

Installing the Battery

1.  Open the access door to locate the battery tray, located below the ON/OFF keypad.

2.  If there is a pull tab at the battery tray, remove the tab to connect the installed

 battery. 

3.  Make sure battery tray is pushed fully into place. 

4.  Place the supplied “CR2” battery into the tray, obs and - markings on tray.

5.  Replace the battery tray into the switch timer.

6.  The display will initialize itself then fl ash “12:00AM” in 

MAN

ual mode.

7.  Press the 

ON/OFF

 button. The switch timer should “click”

Clearing the Timer

1.  Press and hold down the 

ON/OFF

 button.

2.  Using a paper clip or pen, press and release the 

RESET

 button. 

3. When 

INIT

 appears on the screen, release 

ON/OFF

. The screen displays 12:00 am.

Setting the Time and Date

1. Press 

MODE

 to display 

SETUP

. and 

then press 

ON/OFF

.

2. Press 

+

 or 

-

 to set the current hour. and 

then press 

ON/OFF

.

3. Press 

+

 or 

-

 to set the current minute 

and then press 

ON/OFF

.

4. Press 

+

 to advance the year if needed. 

- Press 

ON/OFF

.

5.  Press 

+

 or

 -

 to change the month. - Press 

ON/OFF.

6.  Press 

+

 or 

-

 to change the date and then press 

ON/OFF

.

7.  Press 

ON/OFF

 to choose 

DST

 (Daylight Saving Time)

 • 

Press 

to select 

Man

 if you do not observe DST, or

 • 

Press 

+

 again to select 

Auto

 to automatically set for DST.

8. Press 

ON/OFF 

to choose zone.

9. Press 

+

 to select your zone. See Fig10.

10. Press

 ON/OFF

 to review Dawn Time.

11. Press 

ON/OFF

 twice to review Dusk Time.

12. Press 

ON/OFF

 twice to save.

Programming Dusk ON/Dawn Off

1. Press 

MODE

 to display 

PGM

.

2. Press 

ON/OFF

 to scroll to 

DUSK

.

3.  Press 

ON/OF

F to choose the days you need, then press 

to change days from 

ALL, M-F, 

WeeKenD

, or individual day.

4. Press 

ON/OFF

 to SAVE your work. - Press

 + 

to go to Program 2.

5. Press 

ON/OFF

 twice to display 

DAWN

.

6.  Press 

ON/OFF

 to choose the days you need, then press 

+

 to change days from 

ALL, M-F, 

WeeKenD

, or individual day.

7. Press 

ON/OFF

 to SAVE your work. - Press 

MODE

 to display 

AUTO

.

Programming Dusk ON/Fixed Time OFF

1. Press 

MODE

 to display 

PGM

. - Press 

ON/OFF

 three times to choose 

DUSK

.

2. Press 

ON/OFF

 to choose the days you need, then press

 +

 to change days from 

ALL, M-F, WeeKenD

, or individual day.

 

3. Press 

ON/OFF

 to SAVE your work.

4. Press 

+

 to go to Program 2. - Press 

ON/OFF

 twice to display 

DAWN

.

5. Press 

+

 until you get to 12:00 pm. - Press 

ON/OFF

6. Press 

+

 or 

-

 to set the hour of the 

OFF

 time. - Press 

ON/OFF

.

7. Press 

+

 or 

-

 to set the minutes of the 

OFF

 time. 

8. Press 

ON/OFF

 to choose the days you need, then press 

+

 to change days from 

ALL, M-F, WeeKenD,

 or individual day.

9. Press 

ON/OFF

 to SAVE your work. - Press 

MODE

 to display 

AUTO

Programming Fixed Time ON/Fixed Time OFF

1. Press 

MODE

 to display 

PGM

. - Press 

ON/OFF

 button three times to choose 

DUSK

.

2. Press 

+

 to change it to 12:00 pm. - Press 

ON/OFF

.

3. Press 

+

 or 

-

 to set the hour for the 

ON

 time. - Press 

ON/OFF

.

4. Press

 +

 or 

-

 to set the minutes.

5. Press 

ON/OFF

 to choose the days you need, then press 

+

 to change days from 

ALL, M-F, WeeKenD

, or individual day.

6. Press 

ON/OFF

 to SAVE and then press 

+

 to go to Program 2. 

7. Press 

ON/OFF

 twice to display 

Dawn

.

8. Press 

+

 to change it to 12:00 pm. - Press 

ON/OFF

.

9. Press 

+

 or 

-

 to set the hour for the 

OFF

 time. - Press 

ON/OFF

.

10. Press 

+

 or 

-

 to set the minutes.

11.  Press 

ON/OFF

 to choose the days you need, then press 

+

 to change days from 

ALL, 

M-F, WeeKenD,

 or individual day.

12. Press 

ON/OFF

 to SAVE your work. - Press 

MODE

 button to display 

AUTO

.

Installing the switch timer

1.  Turn off power at the service panel.

2.  Remove the existing wall switch.

3.  Trim building wires to 7/16” as shown.

Single Switch Setup

1.  Connect one of the two wires from the wall to the black wire from the switch timer, using 

the twist connectors provided.

2.  Connect the other wire from the wall to the blue wire from the switch timer, using the 

twist connectors provided.

NOTE: The RED wire is not used in single-switch installations. Cap with a twist connector.

3.  Connect the GREEN wire to the grounding screw in the box. If a plastic box, connect to 

ground as supplied.

4.  Make sure all twist connectors are tight.

Fig. 8

Fig. 10

South

North

Center

North

Center

South

IN-Wall Timer with Astro Feature

Installation and User Instructions

MODEL ST01K SERIES 

•  Resistive (heater) 15 A, 120-277 VAC
•  Tungsten (incandescent) 15 A, 120 VAC, 6 A, 208-277 VAC
•  Ballast (fl uorescent) 8 A, 120 VAC, 4 A, 208-277 VAC
•  Motors 1 H.P. @ 120 VAC, 2 H.P. @ 240 VAC
•  DC Loads 4 A, 12 VDC, 2 A, 28 VDC

Ratings

For a 3-Switch Setup follow the diagram below. 

NOTE: 

The remote switch(es) may not function when the accumulated wire length to the 

remote switch(es) exceeds 100 feet or the wiring to the remote switch(es) is buried under-

ground. Contact Intermatic customer service for further information. 

NOTE: 

Remote switches from a previous conventional installation may not function reliably 

with an electronic timer. Try a new remote switch if function is intermittent. 

ADDITIONAL WIRE

LOAD

NEUTRAL

TWO 3-WAY SWITCHES

RED

BLUE

TIMER

BLACK

LINE

LIMITED ONE-YEAR WARRANTY

If within the warranty period specifi ed, this product fails due to a defect in material or workmanship, 

Intermatic Incorporated will repair or replace it, at its sole option, free of charge. This warranty is extended 

to the original household purchaser only and is not transferable. This warranty does not apply to: (a) damage 

to units caused by accident, dropping or abuse in handling, acts of God or any negligent use; (b) units which 

have been subject to unauthorized repair, opened, taken apart or otherwise modifi ed; (c) units not used in 

accordance with instructions; (d) damages exceeding the cost of the product; (e) sealed lamps and/or lamp 

bulbs, LED’s and batteries; (f) the fi nish on any portion of the product, such as surface and/or weathering, 

as this is considered normal wear and tear; (g) transit damage, initial installation costs, removal costs, or 

reinstallation costs.

INTERMATIC INCORPORATED WILL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. 

SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL 

DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU. THIS WARRANTY IS IN 

LIEU OF ALL OTHER EXPRESS OR IMPLIED WARRANTIES. ALL IMPLIED WARRANTIES, INCLUDING THE 

WARRANTY OF MERCHANTABILITY AND THE WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, 

ARE HEREBY MODIFIED TO EXIST ONLY AS CONTAINED IN THIS LIMITED WARRANTY, AND SHALL BE 

OF THE SAME DURATION AS THE WARRANTY PERIOD STATED ABOVE. SOME STATES DO NOT ALLOW 

LIMITATIONS ON THE DURATION OF AN IMPLIED WARRANTY, SO THE ABOVE LIMITATION MAY NOT 

APPLY TO YOU.

This warranty service is available by either (a) returning the product to the dealer from whom the unit 

was purchased or (b) completing a warranty claim online at www.intermatic.com.

This warranty is made by: Intermatic Incorporated, Customer Service 7777 Winn Rd., Spring Grove, 

Illinois 60081-9698. For warranty service go to: http://www.Intermatic.com or call 815-675-7000.

7/16”

Four or more switch setups

Use the preceding 3-switch installation diagram and connect 4-way switch wires between the 

two 3-way switches. 

• 

Disconnect power at the circuit breaker(s) or disconnect switch(es) before 

installing or servicing.

• 

Installation and/or wiring must be in accordance with national and local 

electrical code requirements.

• 

Use COPPER conductors ONLY.

• 

Do Not recharge, disassemble, heat above 212° F (100° C), crush, or incinerate 

the non-replaceable Lithium battery. Keep Out of Reach of Children. Replace 

only with Panasonic type CR2 or equivalent CR2 battery approved by 

Underwriter’s Laboratories (UL). Use of a different battery may present a risk of 

fi re or explosion upon disposal of battery.

• 

Do NOT use timer to control devices that could have dangerous consequences 

due to inaccurate timing, such as: sun lamps, saunas, heaters, crock pots, etc.

• 

Risk of timer damage due to leakage if weak battery is not replaced promptly.

• 

Dispose of product per local regulations for disposal of Lithium batteries.

WARNING

Risk of Fire or Electric Shock

NOTICE

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