Sensor Replacement
NOTE: The EL-1500 Series OPTIMA Sensor (a two-wire unit) replaces the older
EL-150 Series Sensors (either three-wire or four-wire units). Refer to the
Wiring History shown below.

IMPORTANT

• Be certain to disconnect the 24 VAC power supply either at the transformer
or the fuse box. Failure to disable the power supply can result in damage to
the EL-1500 series Sensor.
• The Solenoid Operator must be removed from the Valve on exposed urinal
installations. Do not damage the O-ring seal on the operator assembly.
1. Remove the Cover Plate (for Wall Box Installation, remove Cover Panel) and
old Sensor from the wall installation. Use a 5/64" hex wrench to remove the
Cover Plate Screws (or #8 drilled spanner head screwdriver EL-318to remove
the vandal-resistant screws from the Wall Box Cover Panel.)
2. Connect one 24 VAC lead to the Sensor terminal labeled “24 VAC IN”
(see Figure 1B).
• On an old three-wire EL-150series Sensor, this wire was connected to the
BLACK Sensor lead.
• On an old four-wire EL-150series Sensor, this wire was connected to the
BROWN Sensor lead.
3. Connect one Solenoid lead to the Sensor terminal labeled “TO VALVE” (see
Figure 1B).
• On an old three-wire or four-wire EL-150 series Sensor, this wire was
connected to the RED Sensor lead.
4. Connect the remaining 24 VAC lead to the remaining Solenoid lead.
• On an old three-wire EL-150series Sensor, these wires were connected to the
WHITE Sensor leads.
• On an old four-wire EL-150series Sensor, these wires were connected to the
YELLOW and BLUE (or in very early models, the inner BROWN).
5. On Water Closet installations only, connect the Override Button (shown as the
Override Switch in Wiring Diagram) parallel to the EL-1500-LSensor.
6. Reinstall the Sensor with the orientation arrow on the Lens side of the Sensor
pointing UP (see Figure 1A). Replace the Cover Plate (or Wall Box Panel) and
tighten the Cover Plate (or Wall Box Panel) Screws.
7. Reconnect the 24 VAC power supply at the transformer or the fuse box.

Figure 1A

Figure 1B

ORIENTATION ARROW
“24 VAC IN”
CONNECTION
“TO VALVE”
CONNECTION
WIRING DIAGRAM
120 VAC
UNIT #1
UNIT #2
THRU
#10
(IF USED)
24 VAC
OVERRIDE
SWITCH ‡
OVERRIDE
SWITCH ‡
EL-1500 SERIES
SENSOR
EL-1500 SERIES
SENSOR
24 VAC COIL
24 VAC COIL
COIL WIRE
COIL WIRE
‡OVERRIDE SWITCH USED
WITH WATER CLOSETS ONLY
NOTE: A MAXIMUM OF TEN (10) SENSOR FLUSHOMETER UNITS CAN OPERATE
FROM ONE (1) SLOAN EL-154 TRANSFORMER. CLASS 2 UL LISTED, 48
VA (MIN.) AT 24 VAC, PLATE MOUNTED.

Figure 2

Start-Up Mode

NOTE: It is important that only
permanent targets are present at
this time.
The self-adaptive sensor automatically
adjusts to the surrounding environment
when the 24 volt supply is activated. No
manual adjustment is required. The
start-up cycle completes in
approximately five (5) minutes. A
continuous red light visible in the sensor
window indicates the Start-up Mode. if
the red light flashes, the Sensor detects
a target. Unless this target is a
permanent fixture in the Sensor’s
environment (i.e., a wall or stall door), it
must be removed from the view of the
Sensor. If a target is permanent, the
Sensor will adapt itself around this
target. In this case, the Start-Up Mode
may take up to 10 (ten) minutes. When
the Start-Up cycle is complete, the red
light will no longer be visible in the
Sensor Window.
NOTE: If the 24 volt power supply is
ever interrupted for longer than
fifteen (15) seconds, the start-up
mode begins automatically when
power is restored.
Incorrect wiring or a short in the 24 volt
power supply will initiate a warning
signal in the Sensor Window. The visible
light flashes a continuous “S-O-S”
signal: three (3) slow, three (3) fast, and
three (3) slow flashes.

EL-150 Wiring History

for 4-wire and 3-wire sensors
BrownBrown Red Red
BrownBrown Red
Red with
Yellow or
all Yellow
Brown
Blue Red Yellow
Brown
Black White
Release date 03/09/78
Release date 08/11/83
Release date 02/02/87
Release date 12/12/90
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