Heath Zenith 121AC User manual

Illustrations may vary from
actual chime unit.
© 2007 HeathCo LLC 598-1142-03
Hardwired Multi-Tune
Chime
IMPORTANT
Proper installation requires a diode on the front door push button.
Diodes are included with all models. Some models also include a
push button with a diode already installed. See page 7 for more
information.

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FEATURES
Manual Storage Slot
A convenient slot in the base has been provided to insert the manual for future reference.
Volume Control
Turn the volume control clockwise to increase the volume or counterclockwise to decrease
the volume.
Reset Button
This button has a dual purpose. 1) To return to the first tune in a Group when using the
Tune Selection Button to cycle through the tune selections. 2) To reset the chime in case
of power failure or surge.
Cover Pin:
A notched cover pin is located on two sides of the chime base.These pins are for selected
covers which hang on the base.
Tune Selections
There are 63 tunes (divided into 9 groups of 7) available for the front door and 2 tunes
available for the rear door. The Tune Selection Guide can be found on page 36.

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RESET
SCROLL TUNE
SELECTION
REAR
TUNE
1
2
1
2
3
456
7
8
9
OFF
GROUP
SELECTION
74 BASE
Wall Anchor (If Needed)
Mounting Hole (x4)
Screw (x4)
Manual Storage Slot
Wire Entrance Hole
Mounting Orientation Marking
Cover Pins
Figure 1
Volume Control
Reset Button
Tune Selections

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CHIME REPLACEMENT INSTALLATION
IMPORTANT: Proper installation requires a diode on the front door push button. See
Diode Installation Instructions (page 7) after completing steps 1 through 10 below.
Note: Electrical work must be in accordance with national and local electrical codes. If in
doubt, consult a qualified electrician.
1. Verify transformer power rating. Power must be supplied from a 16 Volt AC, 10 Watt or a 16 Volt
AC, 15 Watt transformer (Heath®/Zenith models 122C, 121AC, or 125C).
2. Remove cover from existing chime.
3. Label all wires before disconnecting. Using masking tape, mark each wire according to existing
chime terminal markings.
• “F” – Front Push Button Wire
• “T” – Transformer Wire
• “R” – Rear Push Button Wire*
4. Disconnect all wires from existing chime.
5. Remove existing chime base from wall.
6. Determine proper chime base orientation. The chime cover style will determine orientation.
7. Determine cover mounting type. For hanging type covers, cover pin should be exposed (see Figures
1 and 4).
8. Route wires through wire entrance hole in new chime base.
9. Mount chime base to wall using screws and anchors provided. (Drill 7/32" diameter pilot hole for
wall anchors.)
10.Connect wire “F” to screw terminal marked “FRONT”. Connect wire “T” to screw terminal marked
“TRANS”. Connect wire “R” to screw terminal marked “REAR”* (See Figure 2).
11.Install chime cover (see page 6).
12.Connect diode to front push button (see page 7).
*Note: Some installations may not include rear door push button.
MOUNTING SUGGESTIONS
• Power must be supplied from a 16 Volt, 10 Watt transformer or 16 Volt, 15 Watt transformer (Heath®/
Zenith models 122C, 121AC, or 125C).
• Mount door chime in a central location so it can be heard throughout the home (for new installa-
tions).
• See actual unit for orientation of base (see Figure 1).
• Always use mounting wall anchors.
• Use all mounting holes located at four corners of base.
• Route the wires through the wire entrance hole (see Figure 1).

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Figure 2
T
F
FRONT TRANS REAR
UP
R
Wire Entrance Hole
Mounting Orientation Marking
Manual Storage Slot
Chime
Rear Push Button
(If Applicable)
Transformer
Front Push Button
with Diode

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RESET
SCROLL
TUNE
SELECTION
REAR
TUNE
1
2
1
2
3
45
6
7
8
9
0
GROUP
SELECTION
74 BASE
Snap-On Cover
Mounted Chime Base
Figure 3
Figure 4
RESET
SCROLL TUNE
SELECTION
REAR
TUNE
1
2
1
2
3
456
7
8
9
0
GROUP
SELECTION
74 BASE
Cover Pin
Chime Base
ATTACHING CHIME COVERS
Snap-On Cover: Apply pressure to the cover until it snaps into place (see Figure 3). To
remove, firmly grasp cover and pull to remove from base.
Hanging Cover: Before mounting chime base to wall, slide the cover pin that will be on top
of the mounted base out of the base. Turn it over so the pin is protruding above the base.
Slide the cover pin into base (see Figure 4). Hang cover on cover pin.
Note: Cover pins are located on two sides of the chime base for use with hanging covers.
When chime base is mounted according to mounting orientation marking, use the cover pin
located on the top of the chime base for hanging the cover.

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DIODE INSTALLATION INSTRUCTIONS
A small electrical component called a “diode” must be installed on the front door
push button for this chime to play the entire selected tune.
Figure 5
Push Button Diode (Included)
Push Button
Figure 6
Push Button with
Diode Pre-installed
(Not Included with
all Models)
Note:
• A push button with a factory installed diode (indicated by a decal on the back of the push button) is
included with some models.This push button may be used to replace your existing front door push
button. Additional diodes will not be needed and should not be used.
• If a diode is not already installed on the push button being used, connect the supplied diode to the
push button screw terminals as shown in Figure 6.
If, with the diode in place, the chime does not play the entire selected tune, see Trouble-
shooting, page 9.

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TUNE SELECTION (FRONT DOOR)
To Select a Tune to Play Each Time the Pushbutton is Pressed:
1. Determine the group of the selected tune (see Tune Selection Guide, page 36).
2. Set “Group Selection” switch to the group number desired (see Figure 1). Note: No tune will play
when Group Selection is in the “OFF” position.
3. Set “Scroll/Tune Selection” switch to the Tune Selection position.
4. Press the “Tune Selection” button until desired tune is heard. Note: Wait for each tune to play
completely before pressing button for next tune.
5. When the desired tune plays, the tune is now selected to play each time the front door pushbutton
is pressed.
Note: The tunes within each group are sampled in order. Press the Reset button to quickly
start at the beginning of the list within a selected group.
To Select a Group of Tunes to be Played Each Time the Pushbutton is Pressed:
Note: Only one tune will play each time the pushbutton is pressed.The chime will cycle through
the tunes one at a time in the selected group each time the pushbutton is pressed.
1. Determine the group of tunes to be played (see Tune Selection Guide, page 36).
2. Set “Group Selection” switch to the group number desired (see Figure 1).
3. Set “Scroll/Tune Selection” switch to the Scroll position.
4. The group is now selected to play one tune at a time (in order) from the group each time the
pushbutton is pressed.
TUNE SELECTION (REAR DOOR)
To Select a Tune to Play Each Time the Pushbutton is Pressed:
Note: The two tunes are Beethoven’s Fifth (Position 1) and Ding-Dong (Position 2).
1. Set “Rear Tune” switch to desired position (see Figure 1).
2. The chime will now play the set tune each time the rear door pushbutton is pressed.

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TROUBLESHOOTING
Chime does not sound:
• Check the Group Selection Switch: No tune will play when the Group Selection is in the “OFF”
position.
• Check Chime: Disconnect wire from terminal marked “TRANS”. Have someone operate push button
at front door while you momentarily touch the “TRANS” wire to terminal marked “FRONT”.You will
see a small spark if push button, wiring, and transformer are operating properly. Repeat the steps
for “REAR” terminal and rear push button. If wiring between transformer and push button(s) check
out properly, replace chime.
• CheckTransformer: Test transformer voltage output with a volt meter.If a volt meter is not available,
momentarily touch the two low-voltage terminals with a screwdriver. You will see a small spark if
transformer is operating properly. If no spark is evident, replace transformer.
• Check Push Button(s): Remove suspected push button from door frame, disconnect wire from
terminals and touch bare wires together. If chime operates, push button is defective. Replace push
button.
Chime sounds but does not complete entire selected tune:
• Check Diode on Front Push Button: Verify diode is attached securely to push button (see page
7). Chime may not function properly if a diode is installed on more than one push button. Note:
Some push buttons have pre-installed diodes. An additional diode should not be added if the push
button has a pre-installed diode.If selected tune still does not sound completely, replace diode (Type
1N4003-200V-1A, available at local electrical component supplier).
TECHNICAL SERVICE
Please call 1-800-858-8501 (English speaking only) for assistance before returning
product to store.
If you experience a problem, follow this guide. You may also want to visit our Web site at:
www.hzsupport.com. If the problem persists, call* for assistance at 1-800-858-8501, 7:30
AM to 4:30 PM CST (M-F).You may also write* to:
HeathCo LLC
P.O. Box 90004, Bowling Green, KY 42102-9004
ATTN: Technical Service
* If contacting Technical Service, please have the following information available: Model
Number, Date of Purchase, and Place of Purchase.
No Service Parts Available for this Product

10 598-1142-03
HeathCo LLC reserves the right to discontinue and to change specifications at any time
without notice without incurring any obligation to incorporate new features in previously
sold products.
ONE YEAR LIMITED WARRANTY
This is a “Limited Warranty” which gives you specific legal rights.You may also have
other rights which vary from state to state or province to province.
For a period of one year from the date of purchase, any malfunction caused by factory
defective parts or workmanship will be corrected at no charge to you. To obtain a
refund or a replacement, return the product to the place of purchase.
Not Covered - Repair service, adjustment and calibration due to misuse, abuse or
negligence, and expendable items are not covered by this warranty. Unauthorized
service or modification of the product or of any furnished component will void this
warranty in its entirety. This warranty does not include reimbursement for inconve-
nience, installation, setup time, loss of use, or unauthorized service.
This warranty covers only HeathCo LLC assembled products and is not extended
to other equipment and components that a customer uses in conjunction with
our products.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY, REPRESENTATION OR
CONDITION OF MERCHANT ABILITY OR THAT THE PRODUCTS ARE FIT FOR
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AND THERE SHALL BE NO LIABILITY ON THE PART OF HEATHCO LLC FOR
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