A total of 20 set points are provided allowing up to 140 operations
each week (20 set points X 7 days = 140 operations ). Repeat this
procedure for as many of the 20 set points as required. Attempts
to enter additional set points (beyond 20) will cause "F:UL" to
appear in the display.
TO OVERRIDE PROGRAM: Program can be overridden at any
time by selecting the MANUAL position. Program set points will be
maintained but will not operate the controlled load(s)
TO REVIEW PROGRAM SET POINTS: Place the three position
selector in the PROGRAM mode. Place the two position selector
in OUTPUT mode. The display will show all zeros if there are no
set points programmed or will show the first programmed set
point and a programmed time with an ON or OFF depending on
whether the time which appears is an ON set point or an OFF set
point. Pressing the ENTER button will advance the display to the
next set point in chronological order. In other words, the next set
point on Sunday or the set point on Monday (day 2) will appear.
Time switch has no display.
Battery not properly installed or
Display shows scrambled or
Time switch has not been reset.
Electrical noise is interfering with the
operation of the microprocessor.
Display shows "L-bA".
Display means "Low Battery".
Display shows "Err 1" message.Slide switch not fully in its detent
position (open circuit).
Display shows "Err 2" message.
Display shows "Err 3" message.
Load does not switch at-
not in AUTO position.
Time switch is programmed incorrectly.
Power has not been supplied to the
load. Note that the Neutral and Line
terminals #1 & 2 (Line 1 and Line 2
are terminals for model ET174C) are
isolated from the output terminals.
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 shipping damage. This warranty is made by: Intermatic
Incorporated,/After Sales Service/ 7777 Winn Rd., Spring Grove, IL 60081-9698/815-675-7000 http://www.intermatic.com
SPRING GROVE, ILLINOIS 60081-9698
Pressing the ENTER button after the last set point has been
displayed will cause 'E:nd" to appear in the display. Further
operation of the ENTER button will repeat the review cycle.
TO ADD OR DELETE SET POINTS: Press the HOUR and/or
MINUTE buttons to change the time displayed to show the new
time you wish to add, then press the ENTER pushbutton. To
remove a programmed time, press the ON/OFF button two
times. when this is done, the set point displayed will be removed
and the display will show all dashes.
To Operate Timer
After programming is complete, move the selector switches to
the CLK 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.
Check battery and replace if necessary.
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 varistors-
MOVS) across terminals 3/4 (model ET173C
and ET174C across terminals 3/4 & 5/6) will help
to reduce electrical noise generated at the
Replace battery within 30 days.
Reposition slide switch into detent or "wiggle" until
display is corrected. If display does not correct,
contact or return to factory for service.
Slide switch shorted circuit.
Slide switch illegal position.
Be sure MANUAL./AUTO is in the AUTO
Check program - place the Program Selector in
the PROGRAM mode and press the Enter button
to review all twenty.
Be sure power is applied to the line terminals #3
(#3 and #5 for ET173C and ET174C) 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.
Electronic 7 - Day Time Switches
With Battery Carryover
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.
The Intermatic Electronic 7-Day Time Switch automatically
switches loads according to a preset weekly schedule with to-the-
minute accuracy. This time switch is designed to directly switch
inductive or resistive loads up to 30 amps at 24, 120 or 240 volts
and to switch tungsten or ballast loads up to the time switch rating.
For use as a control timer in applications requiring 7-day load
control such as lighting, heating, air conditioning systems, pumps,
etcetera. Up to 20 (10 ON/10 OFF or any combination) set points
(EVENTS) can be preset. These set points can be programmed for
any or all 7 days to provide for up to 140 set points each week.
Independent 7 day programming provides complete flexibility for
applications where load switching differs each day of the week.
The program can be overridden by selecting the MANUAL position.
ET171C (SPST) 120V Supply
ET173C (DPST) 120V Supply
ET174C (DPST) 240V Supply
ET175C (SPDT) 120V Supply
CLOCK VOLTAGE: 120 V.A.C., 60 Hz. (ET171, ET173C, &
240 V.A.C., 60 Hz. (ET174C)
POWER CONSUMPTION: 3.0 Watts Max. (ET171C &ET175C)
5.0 Watts Max. (ET173C & ET174C)
CONTACT CONFIGURATION: SPST model ET171C
DPST model ET173C & ET174C & SPDT model ET175C
SWITCH RATING: (Per Pole for ET173C & ET174C)
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: ET175C
SET POINTS (EVENTS): 20 total (10 ON/10 OFF or any
Up to 140 (70 ON/70 OFF or any combination) weekly.
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: 6 days 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
5. Always replace the plastic insulator covering the terminal before
turning power "ON".