A total of 20 set points are provided allowing up to 140 operations
Pressing the ENTER button after the last set point has been
each week (20 set points X 7 days = 140 operations ). Repeat this
displayed will cause 'E:nd" to appear in the display. Further
procedure for as many of the 20 set points as required. Attempts
operation of the ENTER button will repeat the review cycle.
to enter additional set points (beyond 20) will cause "F:UL" to
TO ADD OR DELETE SET POINTS: Press the HOUR and/or
ET171C (SPST) 120V Supply
appear in the display.
MINUTE buttons to change the time displayed to show the new
Electronic 7 - Day Time Switches
time you wish to add, then press the ENTER pushbutton. To
ET173C (DPST) 120V Supply
TO OVERRIDE PROGRAM: Program can be overridden at any
remove a programmed time, press the ON/OFF button two
With Battery Carryover
time by selecting the MANUAL position. Program set points will be
times. when this is done, the set point displayed will be removed
ET174C (DPST) 240V Supply
maintained but will not operate the controlled load(s)
and the display will show all dashes.
ET175C (SPDT) 120V Supply
To Operate Timer
TO REVIEW PROGRAM SET POINTS: Place the three position
After programming is complete, move the selector switches to
selector in the PROGRAM mode. Place the two position selector
the CLK and AUTO positions. The time switch will follow the
OWNER/INSTALLER INSTRUCTION MANUAL
in OUTPUT mode. The display will show all zeros if there are no
scheduled program but will not immediately "catch up" to the
set points programmed or will show the first programmed set
presently programmed load condition; the time switch will "catch
point and a programmed time with an ON or OFF depending on
up" at the next scheduled ON or OFF setpoint. If necessary,
whether the time which appears is an ON set point or an OFF set
press the ON/OFF button to turn the load on or off.
ATTENTION: READ CAREFULLY BEFORE ATTEMPTING TO INSTALL YOUR INTERMATIC
point. Pressing the ENTER button will advance the display to the
next set point in chronological order. In other words, the next set
TIME SWITCH. FAILURE TO COMPLY WITH INSTRUCTIONS COULD RESULT IN PERSONAL
point on Sunday or the set point on Monday (day 2) will appear.
INJURY AND/OR PROPERTY DAMAGE! RETAIN FOR FUTURE REFERENCE.
CLOCK VOLTAGE: 120 V.A.C., 60 Hz. (ET171, ET173C, &
240 V.A.C., 60 Hz. (ET174C)
Time switch has no display.
Battery not properly installed or
Check battery and replace if necessary.
POWER CONSUMPTION: 3.0 Watts Max. (ET171C &ET175C)
5.0 Watts Max. (ET173C & ET174C)
Display shows scrambled or
Time switch has not been reset.
Press the recessed reset switch and hold for
CONTACT CONFIGURATION: SPST model ET171C
approximately 5 seconds.
DPST model ET173C & ET174C & SPDT model ET175C
Electrical noise is interfering with the
Electrical noise interference is highly unlikely
SWITCH RATING: (Per Pole for ET173C & ET174C)
operation of the microprocessor.
since the electronic circuitry and the power
30 Amps Inductive/Resistive, 24/120/240 V.A.C., 60 Hz.
supply are completely isolated. The installation
20 Amps Resistive - 28 V.D.C.,
of surge suppressors (metal oxide varistors-
1 H.P. 120 V.A.C., 60 Hz.
MOVS) across terminals 3/4 (model ET173C
2 H.P. 240 V.A.C., 60 Hz.
and ET174C across terminals 3/4 & 5/6) will help
5 Amps Tungsten, 120/240 V.A.C., 60 Hz.
to reduce electrical noise generated at the
20 Amps Ballast 277 V.A.C., 60 Hz.
SWITCH RATINGS: ET175C
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
Reposition slide switch into detent or "wiggle" until
position (open circuit).
display is corrected. If display does not correct,
contact or return to factory for service.
Display shows "Err 2" message.
Slide switch shorted circuit.
Display shows "Err 3" message.
Slide switch illegal position.
Load does not switch at-
Be sure MANUAL./AUTO is in the AUTO
SET POINTS (EVENTS): 20 total (10 ON/10 OFF or any
not in AUTO position.
Time switch is programmed incorrectly.
Check program - place the Program Selector in
the PROGRAM mode and press the Enter button
Up to 140 (70 ON/70 OFF or any combination) weekly.
to review all twenty.
BATTERY POWERED CLOCK OPERATION: 3 Years minimum
Power has not been supplied to the
Be sure power is applied to the line terminals #3
(AA industrial grade alkaline supplied with time switch)
load. Note that the Neutral and Line
(#3 and #5 for ET173C and ET174C) in order to
MIN. "ON" or "OFF" TIME: 1 minute.
terminals #1 & 2 (Line 1 and Line 2
power the load. Note that the output contacts are
MAX. "ON" or "OFF" TIME: 6 days 23 hours 59 minutes.
are terminals for model ET174C) are
isolated from the timer power (terminals 1
SHIPPING WEIGHT: 2.5 Lbs. (1.1 Kg)
isolated from the output terminals.
and 2). This allows the timer to switch various
CASE: Drawn steel; 7-3/4" (19.7 cm) high, 5" (12.7 cm)
loads from 24 volts through 277 volts.
wide, 3" (7.6 cm) deep; gray finish w/lockable spring hasp.
KNOCKOUTS: Combination 1/2 - 3/4" (one on back and
LIMITED ONE YEAR WARRANTY
each side, two on bottom).
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,
WIRE SIZE: AWG #10 through #18.
the unit free of charge. This warranty applies only to the original purchaser and is not transferable.
The Intermatic Electronic 7-Day Time Switch automatically
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
switches loads according to a preset weekly schedule with to-the-
General Safety Information
states do not allow a limitation of damages, so the foregoing limitation may not apply to you.
minute accuracy. This time switch is designed to directly switch
WARNING: Disconnect all power before installing or servicing this time
This warranty gives you specific legal rights and you may have other rights that vary from state to state.
inductive or resistive loads up to 30 amps at 24, 120 or 240 volts
INTERMATIC INCORPORATED WILL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. THIS WARRANTY IS IN LIEU OF ALL OTHER
switch or its connected loads.
EXPRESS OR IMPLIED WARRANTIES. ALL IMPLIED WARRANTIES, INCLUDING THE WARRANTY OF MERCHANTABILITY AND THE WARRANTY OF FITNESS
and to switch tungsten or ballast loads up to the time switch rating.
1. Follow all local electrical and safety codes, National Electric Code
FOR A PARTICULAR PURPOSE, ARE HEREBY MODIFIED TO EXIST ONLY AS CONTAINED IN THIS LIMITED WARRANTY, AND SHALL BE OF THE SAME
For use as a control timer in applications requiring 7-day load
DURATION AS THE WARRANTY PERIOD STATED ABOVE.
(NEC), as well as Occupational Safety and Health Act (OSHA).
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
control such as lighting, heating, air conditioning systems, pumps,
2. If the power disconnect point is out of sight, lock it in the "OFF"
authorized service center listed. Please be sure to wrap the product securely when mailing to avoid shipping damage. This warranty is made by: Intermatic
etcetera. Up to 20 (10 ON/10 OFF or any combination) set points
position and tag it to prevent unexpected application of power.
Incorporated,/After Sales Service/ 7777 Winn Rd., Spring Grove, IL 60081-9698/815-675-7000 http://www.intermatic.com
(EVENTS) can be preset. These set points can be programmed for
3. This time switch case must be grounded.
any or all 7 days to provide for up to 140 set points each week.
4. Do not exceed the maximum current carrying capacity of this
Independent 7 day programming provides complete flexibility for
SPRING GROVE, ILLINOIS 60081-9698
applications where load switching differs each day of the week.
5. Always replace the plastic insulator covering the terminal before
The program can be overridden by selecting the MANUAL position.
turning power "ON".