Ii BZ 50 08406r3 WEB Installation Directions

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Power Pack

SPECIFICATIONS
Voltages ............................................ 120/230/277VAC,50/60Hz
Load Requirments
Ballast ............................................... 20amp @120/277VAC
Incandescent ............................................ 20amp @120VAC
Motor ...................................................... 1HP @120/240VAC
Output .......................225mA @24VDC (with relay connected)
Low Voltage Input, Control ON ................................. 12-24VDC
Operating Temperature ........................32°-104°F (0-40°C)

WARRANTY INFORMATION
Watt Stopper/Legrand warranties its products to be free of defects
in materials and workmanship for a period of five (5) years. There
are no obligations or liabilities on the part of Watt Stopper/Legrand
for consequential damages arising out of, or in connection with, the
use or performance of this product or other indirect damages with
respect to loss of property, revenue or profit, or cost of removal,
installation or reinstallation.

Santa Clara, CA 95050

Installation Instructions

BZ-50

DESCRIPTION
The BZ-50 power pack is the foundation for any low voltage lighting control
system. The BZ-50 supplies low voltage power to occupancy sensors and other
control devices, switching line voltage in response to signals from control devices.
The BZ-50 power pack is attached to existing junction boxes or mounted into
fixture wiring trays.
Low voltage wiring should use at least 22-gauge wire, high voltage connections
should use at least 14-gauge. Always check local building codes. After initial
wiring is complete, check wiring diagram to verify power pack is wired correctly.
Improper wiring can cause damage to power pack, lighting system, and
occupancy sensor.

INSTALLATION

WARNING
TURN POWER OFF AT CIRCUIT
BREAKER BEFORE INSTALLING
POWER PACKS.

WIRING

High
Voltage

1. Make sure power has been turned off
at the circuit breaker.
2. Connect wires as shown in Fig.1 or
Fig. 2.
Low Voltage
Class 2

Neut.

BZ-50

White

Red
Switch

Red

Red

Black

Black

Blue

Line

(optional)

+24VDC
Common

Fig. 1: Single load control

Lighting
Load

Control Output

Any 3-Wire
24VDC
Sensor

Call 800.879.8585 for Technical Support

Installation Notes
1. Power packs should be installed in accordance with state, local and national
electrical codes and requirements.
2. Power packs are designed to attach to existing or new electrical enclosures
with 1/2 inch knockouts.
3. Most applications require UL listed, 18-22 AWG, 3-conductor, Class 2 cable for
low voltage wiring. For plenum return ceilings, use UL listed plenum-approved
cables.
4. The BZ-50 is a Class 2 Ouput Power Supply, suitable for parallel
interconnection of up to 10 units maximum. This powerpack is UL Listed for
Interconnection of Power Sources in accordance with the National Electric
Code.

BZ-50
(A)

Switch

(optional)

Blue

Class 2
Low Voltage Wires
Control
Common
+24VDC

BZ-50
(B)

Red

Any 3-Wire
24VDC
Sensor

Lighting
Load (B)

Red

Fig. 2: Parallel interconnect
for multiple load
control from a single
sensor

Blue

Black

Black

Line

White

Red

Neut.

Lighting
Load (A)

Red

Black

Red

Line

Red

White

Black

Neut.

Class 2
Low Voltage Wires

www.wattstopper.com

OPERATION
Low Voltage Input (Blue Wire):
The blue wire carries the +12-24VDC maintained input Control ON signal to the
BZ-50. Applying 12-24VDC to this input closes the BZ-50 load relay. Removing the
voltage returns the relay to its normal state. This input is intended for sensor or
control device input.

Over Current Protection:
The BZ-50 contains built-in short circuit and thermal protection circuitry that
shuts down the +24VDC output (red wire to sensors) to prevent permanent
damage to the power pack. Removing the excess load from the output restores
the BZ-50 to proper operation. The excess load can be connected to another
power pack.

LED Indicator:
The LED indicates the following conditions on the BZ-50:
• LED OFF: no power to the BZ-50, or the +24VDC output is shorted.
• LED ON, blinks once every 5 seconds: the relay is closed (load ON).
• LED ON continuously: the relay is open (load OFF).
• LED blinking continuously: current output limit is exceeded (too many
sensors are connected to the power pack); +24VDC output shut down.
Load Range

ORDERING INFORMATION
Catalog
No.
BZ-50

BZ-150

Description
Power Pack

Power Pack,
Hold ON/OFF,
Manual ON

Input
Voltage

Ballast
(A)

Incan.
(A)

Motor
(hp)

120/230/
277VAC,
50/60Hz

20

20

1

120/230/
277VAC,
50/60Hz

20

Output
24VDC,
225mA
w/relay
connected

20

1

24VDC,
225mA
w/relay
connected

Please
Recycle
2800 De La Cruz Boulevard, Santa Clara, CA 95050
Technical Support: 800.879.8585 • www.wattstopper.com
08406r3 08/2008



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