Thomas & Betts DH720 Instruction Manual

Enclosed you will find:
• Indoor Speaker • Wire Labels
• Outdoor Speaker • Transformer
INSTALLATION
Replacement for Existing Chime
1. Locate Indoor Speaker where chime is located. In many cases
existing wiring can be used–see enclosed "Identifying Chime Wiring."
2. If existing Chime is mounted at a height which is inconvenient to
reach, a pull cord is provided to operate the intercom control button.
3. Important: Do not locate speakers more than 500 feet apart. Do not
locate speakers back-to-back on the same wall.
4. Locate Outdoor Speaker where existing pushbutton is located. Use
pushbutton wiring–see enclosed "Identifying Chime Wiring." Note: If
existing pushbutton is uneven or narrow surface, it will be necessary
to locate Outdoor Speaker elsewhere.
5. Install Outdoor Speaker: (A) on an even surface; (B) on a surface wide
enough for the speaker; (C) as close to existing wiring as possible.
Caution:
• Turn off house power at the source and leave it off until installation is
complete.
• All wiring must comply with local wiring codes.
New Installation Location
1. Install the Indoor Speaker at an easy operating location.
Figure 1
INSTRUCTION GUIDE
Door Chime Intercom
Congratulations on a wise purchase!
• Wire Nuts • Wall Anchors
• Pull Cord • Screws
Green Wires
Indoor Speaker
Brown
Wires
DH720
2. Install the Outdoor Speaker close to the door and at an easy
operating position.
3. Try to install speakers where running the wiring will not present a
problem. Avoid running the speaker wire next to any AC power
wires.
New Installation
1. Install a 16-volt transformer (Carlon Model DH905). Mount the
transformer to a junction box or a circuit breaker box. Do not mount
transformer in high temperature area (i.e., attic). Follow transformer
installation instructions. Connect primary side of the transformer to
120V AC.
2. Run standard 20 AWG (DH965) bell/chime wire from transformer's
secondary terminals to the Indoor Speaker location.
3. Run standard bell/chime wire from the Outdoor Speaker location to
the Indoor Speaker location.
4. Connect brown Outdoor Speaker wires to green Indoor Speaker
wires shown in Figure 1.
5. Connect transformer wires to red Indoor Speaker wires as shown in
Figure 1.
6. Use wire nuts to make all connections. Insulate all connections with
electrical tape.
7. If electric door strike feature is required, see "Optional Electric Door
Strike Wiring."
Red Wires
Outdoor
Speaker
120V AC
Primary
16V
Transformer
1