Installation guide
Digital Monitoring Products XRSuper6/XR20/XR40 Installation Guide
6
INSTALLATION
XRSuper6/XR20/XR40 Installation Guide Digital Monitoring Products
7
INSTALLATION
4.2 Mounting Keypads
DMP keypads have removable covers that allow you to easily mount the base to a wall or other at surface
using the screw holes provided on each corner.
For mounting keypads on solid walls, or for applications where conduit is required, use a DMP 695, 696, 775,
or 776 keypad conduit backbox.
4.3 Installation Specications
Several factors determine the performance characteristics of the keypad bus: the length of wire used, the
number of devices connected, and the voltage at each device. When planning a keypad bus installation,
keep in mind the following four specications:
1. DMP recommends using 18 or 22-gauge unshielded wire for all keypad circuits. Do not use twisted pair
or shielded wire for keypad bus data circuits. All 22-gauge wire must be connected to a power-limited
circuit and jacket wrapped.
2. On keypad bus circuits, to maintain auxiliary power integrity when using 22-gauge wire do not exceed
500 feet. When using 18-gauge wire do not exceed 1,000 feet. To increase the wire length or to add
devices, install an additional power supply that is UL listed for Fire Protective Signaling, power limited,
and regulated (12 VDC nominal) with battery backup.
Note: Each panel allows a specic number of supervised keypads. Add additional keypads in the
unsupervised mode. Refer to the panel installation guide for the specic number of supervised keypads
allowed.
3. Maximum distance for any one bus circuit (length of wire) is 2,500 feet regardless of the wire gauge.
This distance can be in the form of one long wire run or multiple branches with all wiring totaling no
more than 2,500 feet. As wire distance from the panel increases, DC voltage on the wire decreases.
4. Maximum voltage drop between the panel (or auxiliary power supply) and any device is 2.0 VDC. If the
voltage at any device is less than the required level, add an auxiliary power supply at the end of the
circuit. When voltage is too low, the devices cannot operate properly.
For additional information refer to the 710/710F Installation Sheet (LT-0310) and or the LX-Bus/Keypad Bus
Wiring Application Note (LT-2031).
Primary Power Supply
5.1 AC terminals 1 and 2
Connect the transformer wires to terminals 1 and 2 on the panel. Use no more than 70 ft. of 16 gauge, or 40
ft. of 18 gauge, wire between the transformer and the panel.
Always ground the panel before applying power to any devices: The panel must be properly grounded
before connecting any devices or applying power to the panel. Proper grounding protects against
Electrostatic Discharge (ESD) that can damage system components. See Earth ground, in the Secondary
Power Supply section.
5.2 Transformer Types
The transformer for the panel is 16.5 VAC 40 VA, which provides up to 1.5 Amps of bell output current,
500mA of auxiliary current, and 100mA of smoke detector output. You can use either the Model 320 wire-in
or 321 plug-in transformer with the panel. The total current available is limited by the total battery standby
requirements of the installation.
The transformer must be connected to a 120 VAC 60 Hz commercial power outlet that is not controlled by
a wall switch. Never share the transformer output with any other equipment.