Crestron
GLS-LCL
Crestron Green Light® Photocell, Closed-
L
oop
Operations & Installation Guide
The GLS-LCL Closed-Loop Photocell responds to ambient light
levels within an occupied space and provides an analog voltage
proportionate to the ambient light level.
The ambient light measured is the light from any light source in the
visible spectrum. The photocell does not distinguish between
natural sunlight and artificial light. It contains a sensor which is
color and spatially corrected to provide a true representation of
changes in lighting levels that the human eye perceives.
The sensor measures the ambient light that actually falls upon it
within a 60º cone extending downward from the sensor (refer to
“
Field of View
”
illustration below). This is the light that gets reflected
to the ceiling from the walls, floor and furniture.
GLS-LCL Specifications
MOUNTING
NOTE:
Care must be taken when choosing the mounting location.
It is recommended that the sensor be mounted directly above the
work space, such as a desk, conference table or computer terminal.
Mounting location is important because the ambient light level will
be different at different points in the room, depending on the
location of the windows, lighting fixtures, wall colors, etc. The
ambient light at the doorway can be much less than that at the
windows, corners of the room, or especially on the ceiling. There-
fore, it is important to measure the ambient light level over the
workplace.
INSTALLATION
The GLS-LCL can either be fastened onto the ceiling surface, flush
mounted into the ceiling, or installed in a 4" (102 mm) round or
octagonal box, depending on ceiling material and local codes.
1. To fasten the photocell to the ceiling surface, attach the
outer shell provided to the ceiling at the desired location
using two #4 screws and appropriate anchor hardware,
where necessary. For concealed wiring, access to the
space above the ceiling is required, as well as a hole in the
ceiling above the photocell to connect the wires from the
optional GLS-SIM or other Crestron interface device.
DESCRIPTION
Crestron Electronics, Inc.
Operations & Installation Guide - DOC. 6773D
15 Volvo Drive Rockleigh, NJ 07647
(2023020)
Tel: 888.CRESTRON
10.11
Fax: 201.767.7576
Specifications subject to
www.crestron.com change
without
notice.
SPECIFICATION
DETAILS
Power Consumption
Field of View Coverage
Output
1W (42mA @ 24VDC)
60° Cone
0 - 10VDC (0 - 70 footcandles)
Recommended Mounting Location
Directly above work space
60
°
Field of View
Further Inquiries
If you cannot locate specific information or have questions after reviewing this guide, please take advantage of
Crestron's award winning customer service team by calling Crestron at 1-888-CRESTRON [1-888-273-7876]. For
assistance in your region, please refer to the Crestron Web site (www.crestron.com) for a listing of Crestron
worldwide offices.
You can also log onto the online help section of the Crestron Web site (www.crestron.com/onlinehelp) to ask
questions about Crestron products. First-time users will need to establish a user account to fully benefit from all
available features.
Future Updates
As Crestron improves functions, adds new features and extends the capabilities of the GLS-LOL units, additional
information may be made available as manual updates. These updates are solely electronic and serve as
intermediary supplements prior to the release of a complete technical documentation revision.
Check the Crestron Web site periodically for manual update availability and its relevance. Updates are identified as
an “Addendum” in the Download column.
•
To be installed and/or used in accordance with appropriate electrical codes and regulations.
•
If you are unsure about any part of these instructions, consult a qualified electrician.
WARNING:
To avoid fire, shock, or death; turn off power at circuit breaker or fuse and test that power is off before
wiring!
CAUTION:
Insufficient power can lead to unpredictable results or damage to the equipment. Please use the
Crestron Power Calculator to help calculate how much power is needed for the system
(www.crestron.com/calculators).
NOTES:
Observe the following:
FCC Compliance Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
When wiring the Cresnet
®
network, consider the following:
•
Use Crestron Certified Wire.
• Use Crestron power supplies for Crestron equipment.
•
Provide sufficient power to the system.
Network Wiring
Preparing and Connecting Wires
Strip the ends of the wires approximately 1/2 inch (13 mm). Use care to avoid nicking the
conductors. Twist together the ends of the wires that share a connection and tin the
twisted connection. Apply solder only to the ends of the twisted wires. Avoid tinning too
far up the wires or the end becomes brittle. The label on the rear of the dimmer contains
a gauge for wire stripping.
Light Level Testing
Before installing the photocell, verify the daylight levels on a sunny day at the proposed
location of the photocell. With the lights switched off, use a light meter to read the daylight
level. Orient the light meter in the same direction the photocell will view. The light levels
under sunny conditions must be at least 35 fc. If the light levels are less, you should select
another location or reorient the photocell
.
SETUP
This product is Listed to applicable
UL Standards and requirements by
Underwriters Laboratories Inc.
