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Intermatic DT500CL Series - User Manual

Intermatic DT500CL Series
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1
Digital Timer
Installation and User Instructions
MODEL DT500CL Series
One Timed Outlet — has green LED that lights when outlet is 5.
turned on
Green LED6.
Pushbuttons — used for setup, programming and manual 7.
operation of plugged-in device
Reset Button8.
Random Display — indicates when the Random feature is turned 9.
on. Random uses the timer’s settings varied by random 5-minute
increments of ±15 minutes.
Day Of Week (DOW) Display — events can be programmed 10.
for just one day of the week (Daily Mode, 21 total events), all
the days of the week (Weekly Mode, 48 total events), or just
weekends or weekdays (Weekend/Weekday Mode, 24 + 24 total
events)
Event ON/OFF Indicators — a full day is broken into 96 segments 11.
(15 minutes each) to show the ON and OFF times programmed
NOTE: The timer may be set up and programmed before you plug
it in. Be aware that while it is unplugged, the display will turn off to
conserve battery power if there is no pushbutton activity for a few
minutes. If this happens, simply push any button to turn the display
back on.
Input: 102-132 VAC 60 Hz, 2.5W max.•
Output: 10 Amp/1200W Resistive, 5 Amp Inductive, 500W Tungsten•
2 – Get Familiar with the Timer’s Features
Ratings
The timer comes with two LR44 batteries installed.
Remove the pull tab from the 1.
battery holder to connect the
installed batteries.
The timer will turn on and show the 2.
default display (MO, “12:00 PM”)
with the ”12” flashing (Fig. 1).
NOTE: If the default display doesn’t
show, the batteries may be dead.
Replace the batteries before using the
digital timer.
RANDOM
MO TU WE TH FR SA SU
12
1
1
2
2
3
3
4
4
5
5
66
7
7
8
8
9
9
10
10
11
11
PM
AM
12
PM
1 – Activate the Battery
Electrical shock hazard. Risk of injury or death. Always plug three-prong plug •
into a properly grounded outlet. Never attempt to defeat this safety feature.
Risk of fire. Do not use timer to control devices that could have dangerous
•
consequences due to inaccurate timing, such as sun lamps, sauna, heaters,
crock pots, etc.
WARNING
Follow local electrical codes during use.•
Dispose of used batteries promptly per local regulations.•
NOTICE
Its unlikely that your new digital timer has any existing
programming, but to make sure, use this procedure before setting
the time.
Locate the Reset button. It is the small, round hole adjacent to the 1.
keypad. You will need a pen or paper clip to press this button.
Press and release the Reset button. The display will light up all 2.
the segments and then go blank.
The timer has erased all programming, displays the default 3.
settings (MO, “12:00 PM”) and is ready for setup.
3 – Clear Any Existing Programming
NOTE: The time, day AND operating mode must be set before any
ON Events can be programmed. Settings for time and ON Events
will not be activated until setup and programming are complete.
Setting Time and Day
Ensure that the time is displayed. A 1.
timer that is just reset will display
MO, “12:00 PM”.
The first two digits (hours) of the 2.
Time of Day (TOD) display will begin
to flash (Fig. 3).
Turn the selector wheel until the 3.
correct hour shows in the TOD hours
display, along with the PM indicator,
if desired. Note that PM indicator will
alternate on and off as the time
passes through noon and midnight.
Press the 4. ON button to set the new
hour. Or, if no change to the hour
is needed, press the TIME button to
keep the original hour setting. The
last two digits of the TOD display
(minutes) will begin to flash (Fig. 4).
Turn the selector wheel until the 5.
correct time in minutes shows.
RANDOM
MO TU WE TH FR SA SU
12
1
1
2
2
3
3
4
4
5
5
66
7
7
8
8
9
9
10
10
11
11
PM
AM
12
PM
Fig.
3
RANDOM
MO TU WE TH FR SA SU
12
1
1
2
2
3
3
4
4
5
5
66
7
7
8
8
9
9
10
10
11
11
PM
AM
12
PM
Fig.
4
4 – Set the Time, Day and Operating Mode
Fig.
1
PM AM
E
V
E
N
T
T
I
M
E
O
N
O
F
F
RANDOM
MO TU WE TH FR SA SU
12
1
1
2
2
3
3
4
4
5
5
66
7
7
8
8
9
9
10
10
11
11
PM
AM
12
PM
Battery Holder — two LR44 batteries keep time and data up to 1.
three months without power
Time Of Day (TOD) Display — acts like a clock during normal 2.
operation, displays messages during programming and displays
alerts, such as the Low Battery Display
Selector Wheel3.
PM Indicator — comes on to indicate TOD is PM, goes out to 4.
indicate TOD is AM
1
2
3
5
7
8
9
10
11
4
Fig.
2
6

Questions and Answers

  • S
    stevenscodyAug 14, 2025
    Why does my Intermatic DT500CL Timer switch at incorrect times?
    • A
      Alicia HuynhAug 14, 2025
      There are a couple of reasons why your Intermatic Timer might be switching at incorrect times or skipping programmed times. First, the programmed schedule itself might be incorrect, so review the settings and revise them as needed. Second, the timer might be in RANDom mode, which varies switching times by up to ±15 minutes. If you don't want this feature, disable it by entering programming mode, navigating to RANDOM, and changing the setting to OFF.
  • M
    Michelle MyersAug 17, 2025
    What to do if Intermatic DT500CL Timer is not switching on/off?
    • E
      Erica SimmonsAug 17, 2025
      If your Intermatic Timer is operating sluggishly or not switching on/off, it's likely that the batteries are getting weak, even if the low battery indicator isn't displayed. Replacing the batteries should resolve this issue.
  • M
    Miss Debbie PopeAug 21, 2025
    How to program individual days on Intermatic DT500CL?
    • V
      Valerie SweeneyAug 21, 2025
      To program individual days differently on your Intermatic Timer, you need to change the mode to Daily Mode. To do this, hold down the TIME button for 2 seconds to enter setup. Press TIME three times to accept the hours, minutes, and day of the week. Choose Fn1 for Daily Mode and press TIME. Now you can program individual days.
  • J
    Julia YoungAug 26, 2025
    What to do if Intermatic DT500CL shows ON but light is off?
    • E
      Eric CruzAug 26, 2025
      If your Intermatic Timer shows 'ON' but the light or controlled device is off, the problem might be with the light or device itself. Ensure that the light or controlled device is switched on and plugged in.
  • P
    pagedanielAug 28, 2025
    What to do if Intermatic Timer turns off immediately?
    • M
      Melissa CrosbyAug 28, 2025
      If the load turns off immediately after being turned on, and the problem persists, contact Intermatic Customer Service.
  • J
    Jose JimenezSep 2, 2025
    Why does my Intermatic DT500CL display “FUL”?
    • R
      Robert SmithSep 2, 2025
      If you see “FUL” on the display when pressing the ON button in programming mode on your Intermatic Timer, it means you've reached the maximum number of allowed ON Events for the current operating mode. To add more ON Events, you'll need to turn off some existing ON Events first. Follow the instructions under “Changing Program Times”.
  • J
    julia76Sep 5, 2025
    What to do if Intermatic DT500CL doesn't match programmed status immediately?
    • C
      Carol SpencerSep 5, 2025
      If the lights or controlled devices don’t immediately match the programmed on/off status on your Intermatic Timer, it's because the timer doesn't automatically 'catch up' to the programmed load state until you exit the programming mode. Finish programming, and the status will update when you exit.
  • D
    duncanjohnnySep 9, 2025
    Why is my Intermatic Timer ON Event not showing?
    • S
      Steven SmithSep 9, 2025
      If a programmed ON Event isn't showing in the early AM of a viewed day on your Intermatic Timer, it's likely because the ON Event actually starts on the previous day. ON Events are only displayed on the day they begin. To view the event, press the EVENT button repeatedly until you see the day preceding the early AM ON Event.

Summary

Activate the Battery

Battery Installation and Activation

Instructions for installing batteries and activating the digital timer for first use.

Timer Features Overview

Key Timer Components

Identifies and describes main components like the TOD display, selector wheel, and indicator lights.

Clear Existing Programming

Resetting the Timer

Procedure to clear all existing programmed settings and reset to default.

Set Time, Day, and Operating Mode

Configuring Time and Day

Steps to set the current time and day of the week on the digital timer.

Selecting Operating Mode

Choosing between Daily, Weekend/Weekday, or Weekly modes for event programming.

Program ON Events

Viewing Programmed Events

How to view existing ON Events for specific days or modes on the timer.

Setting ON and OFF Times

Detailed steps for programming the ON and OFF times for a device.

Modify Timer Settings

Adjusting Time, Day, or Mode

Instructions to change the current time, day, or operating mode after initial setup.

Manual Device Control

Overriding ON;OFF States

Manually turning the connected device ON or OFF, overriding programmed schedules.

Turning Device ON Manually

Procedure to manually turn the device ON, overriding programmed OFF states.

Random Feature

Enabling Random Operation

Activating the Random feature for varied switching times to simulate occupancy.

Timer Power and Battery

Plugging In and Powering

Instructions for plugging the timer into an outlet and its power conservation.

Battery Status and Replacement

Information on low battery warnings and battery replacement procedures.

Change Programmed Times

Editing Event Times

How to modify existing ON and OFF times for programmed events.

Troubleshooting Guide

Common Problems and Solutions

Addresses issues like 'FUL' display, incorrect switching, and device not responding.

Limited Lifetime Warranty

Warranty Terms and Conditions

Details the warranty coverage, limitations, and claim procedures for the product.

Intermatic DT500CL Series Specifications

General IconGeneral
TypeDigital Timer
Voltage120 VAC
Amperage15 A
ProgrammableYes
DisplayLCD
BrandIntermatic
CategoryTimer
Horsepower1 HP
EnclosurePlastic
Shortest ON/OFF Time1 Minute
Wiring3-Wire
MountingWall
Featuresbattery backup
Programs7

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