A lighting control system is as unique as the home it supports.
Crestron offers the equipment and flexibility of design required for every one-of-a-
kind solution to home automation needs. The designer can create a complete lighting
system consisting of traditional wiring with local intelligence, up to a system that
incorporates distributed, high-voltage wiring with centralized and/or distributed
intelligence. Cresnet low-voltage wiring is used for control throughout this wide
range of system design possibilities.
In a typical home with traditional wiring, a wall switch completes a simple circuit to
an overhead light. Adding additional lighting controls to the room requires that banks
of switches, dimmers, or timers replace the single switch.
In larger homes, businesses, and institutions, a multi-function user interface replaces
the large banks of traditional switches, dimmers, and timers. In addition to lighting,
these user interfaces can also be used to control security, HVAC, and audio/video
systems.
The system control can be located near the user interface, the controlled circuits, or
can be centralized at some other remote location.
Crestron D3 Pro software is a comprehensive design and development tool that
provides a programming environment for all lighting, HVAC and security needs. It
contains many features to facilitate a successful installation, including an
astronomical clock that allows the scheduling of events based on time of day or
sunrise and sunset. Keypads and touchpanels are easily designed and programmed,
and communication among Crestron control equipment is simplified.
Types of Lighting System Designs
Crestron offers centralized and distributed lighting control system components. A
centralized system is one in which all the high-voltage circuits are terminated within
a Crestron home automation enclosure. A distributed system is the traditional wiring
system of individual lighting circuits with local control. The most efficient lighting
systems are a combination of centralized processing and distributed dimmers. This
provides the reliability of local control along with sophisticated central control.
Design Guide – DOC. 5999A Lighting Control System Design • 1
Control System Crestron Lighting
Centralized Design
The high-voltage lighting, fans, motors and switch circuits are individually wired
directly to the modules in the Crestron home automation enclosure. The modules are
controlled by low voltage user interfaces in the living area. This greatly simplifies
the high-voltage wiring while creating a flexible and efficient design using keypad
and touchpanel interfaces.
A central processor, connected via a local area network to the lighting modules and
the user interfaces, is dedicated to lighting, fans, motors, HVAC, and security. Other
processors that are dedicated to other home control systems can communicate via
Ethernet, RS-232 or RS-422 to the lighting processor. This eliminates the need for
additional controls for other home systems, separating home safety and life support
systems from information and entertainment systems, providing a flexible design
solution and a fully integrated home control.
Lighting Layout in a Centralized Design
2 • Lighting Control System Design Design Guide – DOC. 5999A
Crestron Lighting Control System
Distributed Design
In the traditional distributed design wiring method, Crestron wall box dimmers can
be retrofitted into a project after routine high-voltage wiring is completed.
In addition to the traditional high-voltage wiring, a low-voltage communication wire
is run from the dimmer to the nearest Cresnet connection. This design offers the end-
user the familiarity of a traditional control coupled with the power and flexibility of
automated control. In a distributed design, the user has the security of operating the
lighting in the event of a temporary control system interruption.
Lighting Layout in a Distributed Design
Design Guide – DOC. 5999A Lighting Control System Design • 3
Control System Crestron Lighting
Complete Crestron Home Design
A complete Crestron home design is a blend of distributed and centralized design in
which central control intelligence and distributed local dimmers form a reliable
whole house lighting control solution.
Large rooms, stairways, and frequently used rooms are often remotely controlled
using the astronomical time clock or whole-house presets. This level of control
requires connection to a central dimming controller. Each room is equipped with a
low voltage keypad for preset selection and audio/video integration. All the dimmers
in the system (grouped into the central controller for wiring convenience)
communicate with each other through the Crestron control system, providing a
complete Crestron home design.
Lighting Layout in a Complete Crestron Home Design
4 • Lighting Control System Design Design Guide – DOC. 5999A
Crestron Lighting Control System
Requirements for Design
Lighting system design begins with a collection of complete information. The
successful lighting system plan begins with a lighting load schedule that you define
and compile based on the information contained in a detailed floor plan that
identifies the elements of the load schedule design, the location and types of user
interfaces used (i.e., local dimmers, keypads or touchpanels), the control processor
details (large systems should use a dedicated lighting control processor), and the
optional window treatment details, which include shade/blind motors and relay
control (consult manufacturer for details). The following eight steps, performed in
this sequence, is the recommended design procedure.
Step 1: Define the Load Schedule
A load schedule lists the information on each load connected to every circuit in an
electrical panel. This is the primary source of information required for lighting
control system design.
Simplified Room Specifications Example
Design Guide – DOC. 5999A Lighting Control System Design • 5
Control System Crestron Lighting
Example of a Load Schedule (Based on the room example in the previous illustration)
1 2 3 4 5 6 7 8 9
Control
Zone
1 Floor 2 MBR
Area Room Controlled Circuit
name
Ceiling 1 Ceiling Light Incan-
Track 2 Track Light Incan-
Ceiling Fan 3 Ceiling Fan Ceiling
Drape Motor 1 4 Drape Motor 1 3-wire
Drape Motor 2 5 Drape motor 2 3-wire
Controlled
Load Schedule Items
1. Control Zone: Controlled circuits that are not physically wired together, but
Circuit
Number
Fixture Type Load Type DIM Emergency
Lighting?
N Yes 100/120 1 100
descent
Y No 50/120 4 200
descent
N No 60/120 1 60
Fan
N No 240/120 1 240
Motor
N No 240/120 1 240
Motor
Total Wattage For Floor 2 MBR840
Fixture
Wattage and
Voltage
Fixture
Qty
always operating in tandem. For example, perimeter lights, sconce lights
and overhead lights all operating together.
Total
Watts
2. Location of controlled lighting zone, relevant to building site/drawings,
floor designation, and room name.
3. Fixture and/or lamp type of controlled lighting zone, including any
information describing custom fixtures, undetermined fixtures, dimmable
transformers or fluorescent ballasts, and circuit breaker numbers. This
information can also contain the number assigned to the controlled circuit.
4. Load Type of the controlled lighting zone. Load types include incandescent,
magnetic low voltage, electronic low voltage, neon/cold cathode, HID,
dimmable/non-dimmable fluorescent ballast, ceiling fans, and switched 3wire motor circuits. This information is especially important for selecting
the correct Crestron module power rating and type.
5. Dimming requirement for the controlled lighting zone (i.e. whether the
lighting level of the loads/fixtures needs to be ramped up/down or simply
switched on/off). Indicate: “Yes” for Dimming, and “No” for Non-Dim.
6. Emergency designation for the controlled lighting zone (Yes/No; i.e. when
a load also needs to be assigned to a separate emergency power feed). These
items are assigned to their own separate dimmer, so it can be fed with
emergency power.
7. Fixture Wattage (Watts or Power-Rating per Fixture) with regard to the
controlled lighting zone. This is used to determine the number of fixtures
that can be powered per each Crestron Dimmer Module channel, in order
not to overload the dimmer beyond it’s own power rating. Volts rating for
the controlled lighting zone tells the designer the voltage of the electrical
feeds required for that zone, and hence the required rating for the associated
Crestron module. It is recommended, due to electrical codes, to avoid
mixing different voltages in a single enclosure.
NOTE: At the present time, all Crestron load voltage is 120 VAC.
6 • Lighting Control System Design Design Guide – DOC. 5999A
Crestron Lighting Control System
8. Quantity of fixtures for the controlled lighting zone. This is useful, along
with item #6, in calculating the total power rating (watts) for that particular
controlled circuit (item #9).
9. Total Wattage, or Power Rating, of the controlled lighting zone. This is
required in order to determine the total number of Crestron Lighting
Module channels required for that particular zone, especially if the load of
the total number of fixtures exceeds the rating of a single module channel.
NOTE: National and local electrical codes and the functionality of each userinterface must be taken into consideration. Always install electrical devices
according to the national Electrical Code (NEC), local codes, and with safety in
mind.
Equipment List Specification
The equipment list is based on the requirements collected for the lighting system in
the load schedule. This is a sequential step-by-step process. The information
gathered in previous steps is required to complete following steps. Once all the steps
are completed, a complete bill-of-material for the system is created. The seven steps
are as follows:
• Module selection – based on the number and type of loads
• Enclosure selection – based on the number of modules and
locations
• User interface selection – based on the user control requirements
• Wiring plan – based on the previous steps and the layout of the
environment
• Control processor – based on the size of the system (large systems
should have a dedicated processor)
• Network block selection – based on the layout and distribution of
the loads
• Accessories selection – based on the required accessories (third
party telephone and alarm systems, etc.)
NOTE: Crestron D3 Pro software is the ideal tool for specifying an equipment list.
A fully documented help file supports the easy-to-use screens and views. It offers the
designer a starting place for determining modules and enclosures. The Crestron D3
Pro software can also generate a load schedule report. Refer to the latest version of
the Crestron D3 Pro Reference Guide (Doc. 5998) available from the Crestron web
site (www.crestron.com) for detailed information about D3 Pro.
Design Guide – DOC. 5999A Lighting Control System Design • 7
Control System Crestron Lighting
Step 2: Module Selection
The enclosure mounted Crestron modules, connected to the appropriate terminal
block, perform pre-determined functions with various types of light sources, motors
and non-lighting loads. Modules have a Cresnet link for control processor
communication and a module override connection. Six different modules are
available. The type of load, number of circuits, required current load capacity, and
economic considerations are all determining factors when choosing modules. The
number and type of modules is determined from the load schedule. The number of
required modules will determine the size and type of enclosure(s) in the next step.
Each module is wired via the terminal block to a circuit breaker (provided by others).
The power provided to the module is distributed to all of its outputs. Each module
contains relays that provide an individual air gap for each controlled high voltage
circuit. Module selection can be done manually or by the D3 Pro software.
NOTE: A module terminal block (CLT-Series device) must also be ordered for each
module. The corresponding CLT terminal block is installed in the enclosure for high
voltage wire termination. Each terminal block includes a terminal rail for mounting
the terminal block in the enclosure. Terminal rails and blocks do not occupy a
module space within an enclosure.
CLX-2DIM2 Module Specifications
Oversized heat-sink fins on the face of the module provide superior heat dissipation,
eliminating heat related failures. The modules incorporate spit-bobbin transformers
and ground reference electronics for superior performance. AC line noise
interference and lamp flicker are eliminated by an innovative zero-crossing detection
technique and unique Crestron firmware. The red LEDs on the side of the module
indicate the presence of voltage to the module output. The brightness of the LED
corresponds to brightness of the lights. The green and amber Cresnet
communications LEDs indicate both power and communication.
Module Specifications
CLX-2DIM2 has two input feeds and two large capacity dimmers. This module
handles larger loads like chandeliers, landscape lights, and loads using many
transformers or 2-wire ballasts. Each output circuit is limited to 1920 watts (16A).
Load Type Incandescent, magnetic low-
voltage, neon and cold cathode
lighting, and 2-wire fluorescent
ballasts
Module Output 2 controlled circuits, 16A per
controlled circuit, 32A total
Heat Dissipation
Terminal Block
Input Voltage
Size (H x W x D)
Temperature Range
Humidity Range
Weight
170 BTU/Hr (with full load)
CLT-2DIM2
Two 120 VAC 60 Hz, singlephase (same phase)
7 3/8 x 6 7/8 x 3
32 – 104° F
10 – 90% RH (non condensing)
3 lbs.
8 • Lighting Control System Design Design Guide – DOC. 5999A
Crestron Lighting Control System
CLX-1DIM4 is a workhorse module with one input feed and four controlled
dimmers. Ideal for a small mix of loads where some loads are 500W or more. The
single input feed limits the total output of all four controlled dimmer circuits to 1920
watts (16A).
CLX-1DIM4 Module Specifications
Load Type Incandescent, magnetic low-
voltage, neon and cold
cathode lighting, and 2-wire
fluorescent ballasts
Module Output 4 controlled circuits,16A per
controlled circuit, 16A total
Heat Dissipation
Terminal Block
Input Voltage
Size (H x W x D)
Temperature
Range
Humidity Range
Weight
98 BTU/Hr (with full load)
CLT-1DIM4
120 VAC 60 Hz, single-phase
7 3/8 x 6 7/8 x 3
32 – 104° F
10 – 90% RH (non
condensing)
3 lbs.
CLX-1DIM8 Module Specifications
CLX-1DIM8 is best used for multiple small incandescent loads. It is economical to
use only six or seven channels on the module with small loads, while leaving some
channels unconnected. The single input feed limits the total output of all eight
controlled dimmer circuits to 1920 watts (16A).
Load Type Incandescent, magnetic low-
voltage, neon and cold cathode
lighting, and 2-wire fluorescent
ballasts
Module Output 8 controlled circuits, 16A per
controlled circuit, 16A total
Heat Dissipation
Terminal Block
Input Voltage
Size (H x W x D)
Temperature
101 BTU/Hr (with full load)
CLT-1DIM8
120 VAC 60 Hz, single-phase
7 3/8 x 6 7/8 x 3
32 – 104° F
Range
Humidity Range
Weight
10 – 90% RH (non condensing)
3 lbs.
Design Guide – DOC. 5999A Lighting Control System Design • 9
Control System Crestron Lighting
The CLX-4HSW4 switching module can switch four 16A lighting circuits as well as
½ HP (maximum) motors. Loads are switched on and off, but not dimmed. The
maximum load is four controlled circuits per module and 1920 watts (16A) per
controlled circuit (64A maximum total).
CLX-4HSW4 Module Specifications
Load Type INC, MLV, NCC and non-dim
fluorescent, non-dim H.I.D.
Module Output 4 controlled circuits, 16A (1/2
HP) per controlled circuit, 64A
total
Heat Dissipation
Terminal Block
Input Voltage
Size (H x W x D)
Temperature Range
Humidity Range
Weight
42 BTU maximum
CLT-4HSW4
Four 120 VAC 60 Hz, singlephase (same phase)
7 3/8 x 6 7/8 x 3
32 – 104° F
10 – 90% RH (non condensing)
3 lbs.
CLX-1MC4 Module Specifications
The CLX-1MC4 controls up to four 10A (½ HP) maximum bi-directional motors.
High-voltage window treatment motor controls are assigned to CLX-1MC4. The
single input feed limits the total output of all eight controlled dimmer circuits to
1920 watts (16A).
Load Type
Module Output 4 controlled circuits,
Heat Dissipation
Terminal Block
Input Voltage
Size (H x W x D)
Temperature Range
Humidity Range
Weight
3-wire bi-directional motors
10A (1/2 HP) per motor load (5A
each direction), 16A total
22 BTU/Hr
CLT-1MC4
120 VAC 60 Hz,
single-phase
7 3/8 x 6 7/8 x 3
32 – 104° F
10 – 90% RH (non condensing)
3 lbs.
10 • Lighting Control System Design Design Guide – DOC. 5999A
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