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Introduction
The EL78 is an eight channel, electronic time control that provides simple, inexpensive control
of lighting, HVAC, motors, pumps, bell-ringing or any electrical load with a time-of-day sched-
ule. The control may be utilized as a 24 hour, 7 day or full year (365 day) control.
The EL78 allows for the programming of 128 events. An event could be an ON, an OFF, one of
four user defined durations or one of four user defined duty cycle patterns. In addition, up to 32
sensor events can be programmed to allow control based on temperature & light level. Other
parameters can be used; contact the factory for information.
The EL78 is a member of the EL series of time controls, that also includes the EL71, EL72,
EL74, and EL712 (1, 2, 4 and 12 channel, respectively). All are versatile, yet easy to program.
A simple keypad combined with a large, user friendly display takes the frustration out of pro-
gramming.
Specifications
Programming Capabilities
• 128 Events - An event can be an ON, an OFF, one of four user defined durations or one of
four user defined duty cycle patterns. Each event can be assigned to any channel. Each
event can be assigned to any day or any combination of days, including the three holiday
schedules.
• 4 Durations - Each duration can be programmed from 1 second to 23 hours,59 minutes and
59 seconds.
• 4 Duty Cycle Patterns - Each duty cycle pattern can be programmed with ON durations and
OFF durations from 1 second to 23 hours, 59 minutes and 59 seconds.
• 8 User Defined Inputs - Each input can be independently defined as one of two override
types, an enable input or as one of four sensor types.
• ON With Off Delay Override Input - Provides a retriggerable override input that is assignable
to any combination of outputs. The affected output(s) will be overridden ON with the closing of
the input and remain ON as long as the input is closed. When the input is opened, the out-
put(s) will remain ON for the length of the off delay. The off delay is programmable from 0
seconds to 23 hours, 59 minutes and 59 seconds. Closing the input during the off delay will
retrigger the override.
• Toggle Type Override Input - Provides a toggle type override input that is assignable to any
combination of outputs. Closing the input causes the affected output(s) to be toggled to the
opposite state and remain in that state until the occurrence of the next programmed event. An
optional timed-on from 1 second to 23 hours, 59 minutes and 59 seconds can be pro-
grammed. Upon completion of this timed-on, the affected output(s) will return to the pro-
grammed state unless toggled off.
• Enable Input - The enable input is assignable to any combination of outputs. The enable input
acts as a switch which opens and closes in series with the output(s). When open, the load(s)
will remain off. When closed, the output(s) follow the scheduled events.
• Sensor Input - The inputs can be configured as one of four sensor types:
F = degrees Fahrenheit (-40 to 215)
C = degrees Celsius (-40 to 102)
L = light level (0 to 100)
U = undefined (0 to 255)
• 32 Sensor Events - A sensor event will control a channel based on programmable on/off sen-
sor levels. Each sensor event can be assigned to any day or combination of days, including
the three holiday schedules.
• Optional Daylight Savings Correction - Programmable as a day of the month (i.e. 1st Sunday
in April / last Sunday in October)
• Leap Year Correction to the Year 2100
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