Zenith 121AC-A Installation Instructions

TRANSFORMER INSTALLATION INSTRUCTIONS

IMPORTANT:

READ ALL INSTRUCTIONS BEFORE INSTALLING TRANSFORMER.

FOLLOW ALL NATIONAL AND LOCAL ELECTRICAL CODES.

CONTACT A QUALIFIED ELECTRICIAN IF THERE ARE ANY QUESTIONS AS TO THE SUITABILITY OF THE SYSTEM.

1. WARNING:

TURN OFF POWER AT FUSE OR JUNCTION BOX BEFORE INSTALLING TRANSFORMER.

2.

Locate or install a junction box close to the selected mounting location for your chime. Do not install transformer in an

attic location. For new installation remove cover plate and knockout from junction box.

3. Mounting locknut type transformer (Models 121AC and 122C):

From exterior of junction box, pass transformer wires

through hole in junction box. To secure transformer to junction box, fasten locknut to transformer’s threaded shaft on

inside of junction box (see Figure 1).

Mounting clamp type transformer (Models 107C and 125C):

Note:

Mounting clamp requires a junction box with flat

sides and knockouts. From exterior of junction box, pass transformer wires through knockout hole in junction box. Insert

transformer clamp through same knockout hole as wires. Tighten screw (provided) against edge of knockout hole on

junction box (see Figure 2).

4. Connecting Transformer Wires to Power Wires:

If necessary, strip 1/2” of insulation from power supply wires (see

Figure 3). Twist black wire lead from transformer to black wire lead from power supply. Twist white wire lead from trans-

former to white wire lead from power supply. Twist green ground wire from transformer to bare (or green insulated)

copper lead of power supply. For metal junction boxes, it is required to connect green ground wire from transformer to

the metal junction box or clamp it to the metal conduit.

Insulate each connection using UL Approved wire nut (see Figure 4).

5.

Check all connections and replace cover plate.

6.

Attach low voltage wires from chime, bell, or buzzer to secondary screw terminals on transformer (see wiring diagram

included with the chime, bell, or buzzer).

For Model 125C Only:

See arrow markings on transformer to determine correct screw terminals for 8, 16, or 24 volt

connection.

TO REPLACE EXISTING TRANSFORMER, FOLLOW INSTRUCTIONS ABOVE (OMIT STEP 2). LABEL WIRES PRIOR

TO REMOVAL OF EXISTING TRANSFORMER.

P.O. Box 90045

Bowling Green, KY 42102-9045

Figure / Figura 1

Figure / Figura 2

1/2"

Figure / Figura 3

Figure / Figura 4

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598-1110-06