ET100 Series Timer

User Manual: ET100-series-timer

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Trouble Shooting
SYMPTOM

POSSIBLE CAUSE(S)

®

CORRECTIVE ACTION

Time switch has no display.

Battery not properly installed or
defective.

Check battery and replace if necessary.

Display shows “L-bA”.

Display means “Low Battery”.

Replace battery within 30 days.

Display shows “Err 1” message. Slide switch not fully in its detent
position (open circuit).
Display shows “Err 2” message. Slide switch shorted circuit.
Display shows “Err 3” message. Slide switch illegal position.

Reposition slide switch into detent or “wiggle” until
display is corrected. If display does not correct,
contact or return to factory for service.

Display shows scrambled or
erratic times.

Press the recessed reset switch and hold for
approximately 5 seconds.
Electrical noise interference is highly unlikely
since the electronic circuitry and the power
supply are completely isolated. The installation
of surge suppressors (metal oxide varistorsMOVS) across terminals 3/4 (model ET103C
across terminals 3/4 & 5/6) will help to reduce
electrical noise generated at the switching
contacts.

Load does not switch atprogrammed time.

Time switch has not been reset.
Electrical noise is interfering with the
operation of the microprocessor.

MANUAL/AUTO selector not in AUTO
position.
Time switch is programmed incorrectly
Power has not been supplied to the
load through the line (line 1 and
line 2 for ET103C) terminals.

Be sure MANUAL/AUTO is in the AUTO
position.
Check program - place the Program Selector in
the PROGRAM mode and press the Event button
to review all eight possible Events.
Be sure power is applied to the line terminals #3
(#3 and #5 for ET103C) in order to power the
load. Note that the output contacts are isolated
from the timer power (terminals 1 and 2).
This allows the timer to switch various loads
from 24 volts through 277 volts.

LIMITED ONE YEAR WARRANTY
If within one (1) year from date of purchase, this product fails due to a defect in material or workmanship, Intermatic Incorporated will repair or

replace, at its sole option, the unit free of charge. This warranty applies only to the original purchaser and is not transferable.
The warranty does not apply to: (a) damage caused by accident, abuse, mishandling, dropping, acts of God, or any negligent use; (b) units which
have been subject to unauthorized repair, opened, taken apart, or otherwise modified; (c) units not used in accordance with directions; (d) damages
exceeding the cost of the product. Some states do not allow a limitation of damages, so the foregoing limitation may not apply to you.
This warranty gives you specific legal rights and you may have other rights that vary from state to state.
INTERMATIC INCORPORATED WILL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. 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.
This warranty service is available by either (a) returning the product to the dealer from whom the unit was purchased, or (b) mailing postage prepaid
to the nearest authorized service center listed. Please be sure to wrap the product securely when mailing to avoid damage. This warranty is made
by: Intermatic Incorporated/After Sales Service, 7777 Winn Rd., Spring Grove, IL 60081-9698.

Electronic 24 Hour Time Switches
With Battery Carryover

http://www.intermatic.com

INTERMATIC INCORPORATED
SPRING GROVE, ILLINOIS 60081-9698

158--00385

INCLUDING MODELS:
ET101C (SPST)
ET103C (DPST)
ET105C (SPDT)

OWNER/INSTALLER INSTRUCTION MANUAL
ATTENTION: READ CAREFULLY BEFORE ATTEMPTING TO INSTALL YOUR INTERMATIC
TIME SWITCH. FAILURE TO COMPLY WITH INSTRUCTIONS COULD RESULT IN PERSONAL
INJURY AND/OR PROPERTY DAMAGE! RETAIN FOR FUTURE REFERENCE.
Specifications

CLOCK VOLTAGE: 120 V.A.C., 60 Hz.
POWER CONSUMPTION: 3.0 Watts Max. (ET101C) & 	
		
ET105C)
5.0 Watts Max. (ET103C)
CONTACT CONFIGURATION: SPST model ET101C
DPST model ET103C, & SPDT model ET105C.
SWITCH RATING: (Per Pole for ET103C)
• 30 Amps Inductive/Resistive, 24/120/240 V.A.C., 60 Hz.
• 20 Amps Resistive - 28 V.D.C.,
• 1 H.P. 120 V.A.C., 60 Hz.
• 2 H.P. 240 V.A.C., 60 Hz.
• 5 Amps Tungsten, 120/240 V.A.C., 60 Hz.
• 20 Amps Ballast 277 V.A.C., 60 Hz.
SWITCH RATINGS: ET105C
N.O.
N.C. CONTACT
20 AMP        10 AMP          Resistive and          28 VDC.
                                         General Purpose    120-240 VAC
1 H.P.           1/4 H.P.          MOTOR                 120 V.A.C.
2 H.P.           1/2 H.P.          MOTOR                  240 V.A.C.
5 Amp               -                TUNGSTEN           120-240 V.A.C.
20 Amp         3 Amp            BALLAST                 
120-277
V.A.C.
AM

ON

5:20

SERVICE CENTER/ SERVICE CENTRE
CENTRE DE SERVICE
INTERMATIC INCORPORATED
After Sales Service
7777 Winn Rd.,
(815) 675-7000

ET100 SERIES

Description

The Intermatic Electronic 24 Hour Time Switch automatically
switches loads according to a preset daily schedule.
This time switch is designed to directly switch loads up to 30 amps
and to switch resistive or inductive loads up to the time switch
rating. For use as a control timer in applications requiring 24 hour
load control such as lighting, heating, air conditioning systems,
pumps, etcetera. Up to eight set points or events (4 ON/4 OFF)
can be preset. this schedule will repeat on a daily basis. The program can be overridden by using the MANUAL position.

SET POINTS (EVENTS): 8 total (4 ON/4 OFF).
BATTERY POWERED CLOCK OPERATION: 3 Years minimum
(AA industrial grade alkaline supplied with time switch)
MIN. “ON” or “OFF” TIME: 1 minute.
MAX. “ON” or “OFF” TIME: 23 hours 59 minutes.
SHIPPING WEIGHT: 2,5 Lbs. (1.1 Kg)
CASE: Drawn steel; 7-3/4” (19.7 cm) high, 5” (12.7 cm)
wide, 3” (7.6 cm) deep; gray finish w/lockable spring hasp.
KNOCKOUTS: Combination 1/2 - 3/4” (one on back and
each side, two on bottom).
WIRE SIZE: AWG #10 through #18.

General Safety Information

WARNING: Disconnect all power before installing or
servicing this time switch or its connected loads.
1. Follow all local electrical and safety codes, National
Electric Code (NEC), as well as Occupational Safety and
Health Act (OSHA).
2. If the power disconnect point is out of sight, lock it in the “OFF”
		
position and tag it to prevent unexpected application of power.
3. This time switch case must be grounded.
4. Do not exceed the maximum current carrying capacity of this
time switch.
5. Always replace the plastic   insulator covering the terminal
before turning power “ON”.

Installation

10. Press the reset switch for three to five seconds. The
display will now show 12:00 A.M. and Event #1. The
timer is now ready for programming. Refer to the chart
below and enter the scheduled events (set points)
required.

WARNING: DISCONNECT THE POWER TO THE TIME SWITCH
AND THE LOADS BEFORE INSTALLING THIS TIME SWITCH.
1. Mount the time switch in the desired location using the three
mounting holes which are provided. Mount the time switch at eye
level, if possible, providing sufficient room to the left of the
enclosure for the cover to swing open fully. (See Figure #1 and
Figure #2). The time switch mechanism does not need to be
removed from the enclosure to mount the time switch since the
top mounting hole is a slotted type mounting hole. Secure a
screw or other fastener at eye level. The head of the screw or
fastener should be slightly larger than the narrow portion of the
slotted hole to ensure that the time switch is securely held in
place. The remaining two mounting holes are accessible without
removing the time switch mechanism and will provide secure
and permanent mounting of the time switch.
2. If you do remove the mechanism, refer to Figure #1 and remove
the mechanism from the case by depressing the catch at the top
of the case and pulling out.
CAUTION; DO NOT TOUCH THE CIRCUIT
COMPONENTS SINCE STATIC DISCHARGE
DAMAGE THE MICROPROCESSOR.

BOARD
COULD

EVENT
On 1
Off 2
On 3
Off 4
On 5
Off 6
On 7
Off 8

Mounting Holes

5. Strip   the supply and load wires by removing 1/2 inch of
insulation. DO NOT USE ALUMINUM WIRE. (See figure #3, #4
or #5). Insert the wire ends under the proper terminal plates and
tighten the screws firmly. Use AWG #10 through #18. Connect
ground wire to grounding terminal at bottom of case.

9. Reapply power to the time switch.

• The MANUAL/AUTO selector can be used to temporarily
override the program. Under normal operation the
selector should be in the AUTO mode. The MANUAL
mode maintains the program but prevents the loads
from automatically switching.

Install Jumper Only If Timer
Input and Load Voltage Are
The Same, Otherwise provide
a separate source of load
power to terminal 3& 5.

FIG. #4
ET103C DPST
NOTE: For 120 Volt loads only since the timer voltage is 120 VAC
jumpers can be added between terminals 2 and 3 to supply load power.
CAUTION: Do not use jumpers if load(s) are not 120V. because the load can be
damaged. Supply separate power of the correct voltage.

TIMER
POWER

2
1
NEUTRAL LINE

• The RESET switch  is used only prior to initially programming the time switch or to erase all programmed set
points.
Knockouts
FIG. #2

8. Place the selector switches in the “MANUAL” and “RUN”
positions.

Hot

• The other selector switch is used to set the time of day
(TIME SET), the program information (PROGRAM) or to
run the program (RUN). FOR A PROGRAM TO
FUNCTION PROPERLY, THE TWO SELECTOR
SWITCHES MUST BE IN THE AUTO AND RUN
POSITIONS.

4. Lift the left side of the insulator off of the retaining post and pivot
it up and away to expose the terminal strip.

7. Be sure that the battery is functioning properly. this can be
checked by making sure the display is visible. If the display has
scrambled information, press the RESET switch and hold for
three to five seconds. Note that the battery can easily be
replaced without removing the time switch mechanism or field
wiring. simply press in and downward (in the direction of the
arrow) on the battery cover which is identified with the word
“Battery”. It is recommended that the battery be replaced with a
“AA” industrial grade alkaline cell at two to three year intervals
as part of the normal time switch maintenance observing battery
polarity markings when installing. No other maintenance is
required.

Neutral
120 VAC

Refer to programming instructions on time switch door
label and note the following:

3. Replace the mechanism in the case if it has been removed.

6. Replace the plastic insulator.

TIME

Programming Steps

FIG. #1

NOTE: For 120 Volt loads only since the timer voltage is 120 VAC
a jumper can be added between terminals 2, 3 and 5 to supply load
power.
CAUTION: Do not use jumper if load(s) are not 120V. because the
load can be damaged. Supply separate power of the correct voltage
to terminal 3 and 5.

NOTE: For 120 Volt loads only since the timer voltage is 120 VAC
a jumper can be added between terminals 2 and 3 to supply load
power.
CAUTION: Do not use jumper if load(s) are not 120V. because the
load can be damaged. Supply separate power of the correct voltage
to terminal 3.

• By holding the hour and/or minute buttons depressed
you can achieve a fast roll of the displayed time. This is
useful when setting the time of day or setting the
programmed set points (events).

Install Jumper Only If
Timer Input and Load
Voltage Are The Same,
Otherwise provide a
separate source of load
power to terminal 3.

FIG. #3
ET101C SPST

For breaking one side of
120 volt loads.

FIG. #5
ET105C SPDT

• The load can manually be switched ON or OFF at any
time only if the selector switch is in the RUN mode by
pressing the ON/OFF button.

To Operate Timer
After programming is complete, move the selector
switches to the RUN and AUTO positions. The time switch
will follow the scheduled program but will not immediately
“catch up” to the presently programmed load condition;
the time switch will “catch up” at the next scheduled ON or
OFF setpoint. If necessary, press the ON/OFF button to
turn the load on or off.

5

Install jumper Only If Timer LOAD 1
Input and Load Voltage Are
The Same, Otherwise provide
a separate source of load
power to terminal 3.
LOAD 2

• Up to 4 ON and 4 OFF set points (8 events) can be
programmed.

• Pressing the ON/OFF button two times in the
PROGRAM mode causes the event time displayed to be
removed from the program. The display will show 0:00
and the Event (1 through 8).

3
4
LINE 1

LOAD STATUS INDICATOR
“ON” or “OFF”

AM ON
PROGRAM
SELECTOR

EVENT
INDICATOR

MANUAL/AUTO
SELECTOR

PROGRAMMING/
MANUAL LOAD
CONTROL
BUTTON

PROGRAMMING
BUTTONS

FIG. #6
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