2
INSTALLATION AND WIRING
These instructions describe single pole, 3-way and multi-way circuit
applications.
If you are unable to clearly identify some or all of the wires identified in step
2 of the instructions, you should consult with a qualified electrician.
Steps 3a, 3b, and 3c describe each circuit application.
For information about other applications, consult technical support or the
Wattstopper website.
1.
Prepare the switch box.
After the power is turned
OFF
at the circuit breaker box, remove the existing wall plate and mounting screws. Pull the old switch
out from the wall box.
2.
Identify the type of circuit.
You may connect the CU-250 to a single pole (see Fig. 2) or multi-way circuit. If you are unable to clearly identify some or all of the
wires mentioned in this manual, you should consult with a qualified electrician.
In a 3-way circuit (see Fig. 2a), two traveler wires connect to both switches. Another wire provides power from the circuit box to
one of the switches. A wire connects from one switch to the load. A ground wire may also be connected to a ground terminal on the
old switches. A neutral wire should also be present in both wall boxes.
CAUTION
For your safety: Connecting a proper ground to the sensor provides protection against electrical shock in the event of certain
fault conditions. If a proper ground is not available, consult with a qualified electrician before continuing installation.
3.
Prepare the Wires.
Tag the wires currently connected to the existing switch so that they can be identified later. Disconnect
the wires. Make sure the insulation is stripped off of the wires to expose their copper cores to the length
indicated by the “Strip Gage,” in Fig. 3. (approx. 1/2 inch).
a.
Single pole wiring:
Twist the existing wires together with the wire leads on the CU-250 sensor as indicated
below. Cap them securely using the wire nuts provided (See Fig 3a).
• Connect the green or non-insulated (copper) GROUND wire from the circuit to the
green terminal on the CU-250.
• Connect the NEUTRAL wire from the circuit and from the lamp (LOAD) to the white wire
on the CU-250.
• Connect the power wire from the circuit box (HOT) to the black wire on the CU-250.
• Connect the power wire from the lamp (LOAD) to the red wire on the CU-250.
• Cap the yellow wire on the CU-250. It is not used in single pole applications.
b.
3-way wiring using two CU-250s:
Twist the existing wires together with the wire leads on the CU-250 sensors as indicated
below. Cap them securely using wire nuts provided. (See Fig. 3b)
• Connect the green or non-insulated (copper) GROUND wire from the circuit to the
green terminal on each CU-250.
• Connect the NEUTRAL wire from the circuit and from the lamp (LOAD) to the white wire
on the master CU-250.
The load can be connected to either sensor. The sensor that is connected to the load is
designated as the master sensor.
• Connect the NEUTRAL wire from the circuit in the other wiring box to the white wire on
the auxiliary CU-250.
• Connect the power wire from the circuit box (HOT) to the black wire (TRAVELER 1) on
the master CU-250.
• Connect the black wire of the auxiliary CU-250 to the black wire of the master CU-250.
• Connect the lamp power (LOAD) to the red wire on the master CU-250.
• Cap the red wire on the auxiliary CU-250.
• Connect the yellow wire of the CU-250 to the yellow wire (TRAVELER 2) of the CU-250 that you are wiring.
TRAVELER
TRAVELER
Lamp/Load
HOT
(power from
circuit box)
GROUND
GROUND
LOAD
(power to lamp)
NEUTRAL
NEUTRAL
MASTER SWITCH
AUXILIARY SWITCH
Ground
HOT (power from
circuit box)
LOAD
(power
to lamp)
NEUTRAL
Fig. 2: Typical Single-Pole Switch
Fig. 2a: Typical 3-Way Switch Wiring
Strip Gauge
1/2"
12.7mm
Fig. 3: Wire Stripping
TOP
INDO
OR U
SE O
NLY
Green -> GROUND
Terminal
Black -> HOT (power
from circuit box)
L
L
White ->
NEUTRAL
Red -> LOAD (power
to lamp or fan)
Yellow
(not used)
Industry standard
switch cover plate
(not provided)
Fig. 3a: Sensor orientation, wire
connections, and wall box assembly
WARNING:
DISCONNECT POWER TO THE
WALL SWITCH BOX BY TURNING OFF
THE CIRCUIT BREAKER OR REMOVING
THE FUSE FOR THE CIRCUIT BEFORE
INSTALLING THE CU-250, REPLACING LAMPS,
OR DOING ANY ELECTRICAL WORK.
