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 to terminal 3.
TIMER
POWER
1
NEUTRAL
2
3
4
LOAD 1
5
LOAD 2
NEUTRAL
NEUTRAL
LINE
LINE 1
Install jumper Only If Timer
Input and Load Voltage Are
The Same, Otherwise provide
a separate source of load
power to terminal 3.
For breaking one side of
120 volt loads.
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 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 BOARD
COMPONENTS SINCE STATIC DISCHARGE COULD
DAMAGE THE MICROPROCESSOR.
3.Replace the mechanism in the case if it has been
removed.
4.Lift the left side of the insulator off of the retaining post
and pivot it up and away to expose the terminal strip.
5.Strip the supply and load wires by removing 1/2 inch of
insulation. DO NOT
USE ALUMINUM WIRE. (See
figures 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.
6.Replace the plastic insulator.
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 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 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.
8.Place the selector switches in the AUTO and CLK
position.
9.Reapply power to the time switch.
10.Press the reset switch for three to five seconds. The
display will now show 12:00 A.M. and day #1. Note that
the days of the week are numbered 1 through 7 for
Sunday through Saturday. The timer is now ready for
programming. Refer to the chart which follows and
enter the scheduled events (set points) required. Assign
each of the 20 set points (EVENTS) entered to
whichever day or days of the week you wish an ON or
OFF operation to occur. simply put a check in the box
that applies. Note that programming two off times in
sequence, allows the user to manually turn a load on,
after normal working hours for example, and allows the
time switch to automatically turn the load back off. This
is an energy saving feature which allows loads to be
manually switched on after normal occupancy times,
but provides for automatic off switching of these loads.
Note that several off times in a row can be programmed
to provide several “auto off” times.
Mounting Holes
Knockouts
FIG. #1
FIG. #2
FIG. #3
ET171C SPST
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.
Install Jumper Only If
Timer Input and Load
Voltage Are The Same,
Otherwise provide a
separate source of load
power to terminal 3.
AM ON
5
5::2
20
0
FIG. #4
ET173C DPST
ET174C DPST
LOAD STATUS INDICATOR
“ON” or “OFF”
DAY
INDICATOR
PROGRAM OUTPUT
PROGRAM CLOCK
SELECTOR
2 POSITION
PROGRAM
AUTOMATIC
MANUAL
OVERRIDE
SELECTOR
3 POSITION
PROGRAMMING/
MANUAL LOAD
CONTROL
BUTTON
FIG. #6
PROGRAMMING
BUTTONS
Install jumper Only If Timer
Input and Load Voltage Are
The Same, Otherwise provide
a separate source of load
power to terminal 3 & 5.
120 or 240 VAC
Input
FIG. #5
ET175C SPDT
DAY
SWITCHING
“ON” OR “OFF”
SUN.
MON.
TUES.
WED.
THUR.
FRI.
SAT.
EVENT
TIMES
OPERATION
1
2
3
4
5
6
7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Programming Steps
Refer to programming instructions in this manual or the abbreviated
instructions on time switch door label and note the following:
• The three position slide switch is used to select automatic operation
(AUTO), manual operation (MANUAL) or to select programming
(PROGRAM). The MANUAL position 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. FOR A PROGRAM
TO SWITCH LOADS AT THE CORRECT TIMES, THE SELECTOR
SWITCH MUST BE IN THE AUTO POSITION.
• The two position selector switch is used to select programming for
the time of day and day of week (CLK) or select programming for the
switching times (OUTPUT).
• The RESET switch is used only prior to programming to reset the
microprocessor or to erase all programmed set points.
• 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 programming set points (EVENTS).
• UP to 10 ON and 10 OFF set points or any combination up to 20 set
points (EVENTS) can be programmed and can be assigned to any
or all 7 days for up to a maximum of 140 set points each week.
• The load can be manually switched 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 two position selector MUST BE IN OUTPUT
MODE.
• Pressing the ON/OFF button two times in the PROGRAM mode
causes the event time displayed to be removed from the program.
(only if the set point event has already been entered). The display
will show “-:--”.
Programming
RESET TIME SWITCH: Press the recessed RESET switch to reset the
microprocessor and delete any set point information which has been
programmed. NOTE: DO NOT press RESET after programming has
begun or you will loose all of your program information.
TO SET TIME AND DAY OF WEEK: Place the three position selector
in PROGRAM and the two position selector in CLK mode. Press the
HOUR, MINUTE and DAY buttons individually to select the current time
of day (12 hour AM/PM repeating) and the day of the week. Day 1 is
Sunday, day 2 is Monday, etc.
TO PROGRAM SET POINTS: Select PROGRAM mode with the three
position selector and OUTPUT mode with the two position selector.
Press the HOUR and MINUTE buttons separately to program the first
set point time desired. Press the DAY button to select the day the event
is to occur. Press the ON/OFF button to select an ON or OFF set point.
Press the ENTER button to enter that set point for the selected day.
Note that the ON or OFF indicator stops flashing only after pressing
ENTER. If this set point is to occur for other days of the week, simply
press the DAY button to select the next day then ENTER. Repeat for
any additional days. Note that this allows you to utilize one set point for
any or all days of the week.
