Keypad Installation - Crestron CNWM-LT9 User Manual

®
LiteTouch Keypad
When calculating the wire gauge for a particular Cresnet run, the length of the run and the load
factor of each network unit to be connected must be taken into consideration. If Cresnet units
are to be daisy-chained on the run, the load factor of each unit to be daisy-chained must be
added together to determine the load factor of the entire chain. If the unit is a home-run from a
Crestron system power supply network port, the load factor of that unit is the load factor of the
entire run. The length of the run in feet and the load factor of the run should be used in the
following resistance equation to calculate the value on the right side of the equation.
Resistance Equation
R < L x LF
The required wire gauge should be chosen such that the resistance value is less than the value
calculated in the resistance equation. Refer to the table below.
Wire Gauge Values
RESISTANCE (R)
NOTE: All Cresnet wiring must consist of two twisted-pairs. One twisted pair is the +24V
conductor and the GND conductor and the other twisted pair is the Y conductor and the Z
conductor.
NOTE: When daisy-chaining Cresnet units, always twist the ends of the incoming wire and
outgoing wire which share a pin on the network connector. After twisting the ends, tin the
twisted connection with solder. Apply solder only to the ends of the twisted wires. Avoid
tinning too far up the wires or the end becomes brittle. After tinning the twisted ends, insert the
tinned connection into the Cresnet connector and tighten the retaining screw. Repeat the
procedure for the other three conductors.

Keypad Installation

After the Cresnet network wiring has been installed and the supplied Cresnet connector
attached to the wiring in a standard, 1-gang electrical box, the CNWM-LT9 may be installed.
The only tool required is a Phillips tip screwdriver. (Mounting screws are not provided.) To
install the keypad, perform the following procedure:
NOTE: The CNWM-LT9 may be installed in any orientation. This procedure assumes that the
keypad will be installed vertically with the LEDs ABOVE the buttons.
4 LiteTouch® Keypad: CNWM-LT9
40,000
Where:
WIRE GAUGE
4
6
10
15
13 24 (Doubled-CAT 5)
1. Make sure that the Cresnet system power is turned OFF.
2. Separate the magnetic faceplate from the button assembly.
3. Connect the Cresnet connector to the rear of the keypad system adapter.
R = Resistance (refer to next table).
L = Length of run (or chain) in feet.
LF = Load factor of entire run (or chain).
16
18
20
22
Operations & Installation Guide - DOC. 5785
Crestron CNWM-LT9