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®

ET270 SERIES

INCLUDING MODELS:

ET279C (SPST each output)

120V Supply

Electronic 7 - Day Time Switches

With 2 Independent Outputs and
Battery Powered Clock Operation

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: 5.0 Watts Max. 
CONTACT CONFIGURATION: SPST for output 1 and 2
SWITCH RATING: (Per Pole)

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.

SET POINTS (EVENTS): 20 total for both outputs combined in
any combination (10 ON/10 OFF or any combination or 20
momentary pulse operations) daily.
Up to 140 (70 ON/70 OFF or any combination or 140 pulse
operations) 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

time switch.

5. Always replace the plastic insulator covering the terminal

before turning power “ON”.

Installation

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

AM        ON

5:20

Description

The Intermatic Electronic 7-Day Time Switch automatically 
switches 2 loads independently according to a preset weekly 
schedule with to-the-minute accuracy. This time switch is 
designed to directly switch resistive or inductive 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 or 20 momentary pulse 
operating) can be preset. These set points can be programmed 
for any or all 7 days to provide for up to 140 set points or pulse 
operations each week. Independent 2 load 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.

 

Summary of Contents for ET279C

Page 1: ...ected 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 t...

Page 2: ... 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 down ward in the direction of the arrow on the battery cover which is identified with the word Battery It is recommended that the battery be ...

Page 3: ...tched ON or OFF at any time if the selector switch is in either the MANUAL or AUTO mode by pressing the ON OFF button The left selector MUST BE IN OUTPUT 1 or OUTPUT 2 MODE 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 Programming RESET TIME SWITCH Press the recessed RESET switch to reset the microproce...

Page 4: ...TATED 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 815 675 7000 ...

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