Lathem Airtime AT-DDC4 Operation manual

Wireless Digital Wall Clock
Model AT-DDC4
Installation & User’s Guide

THIS EQUIPMENT COMPLIES WITH FCC REQUIREMENTS
PURSUANT SUBPART J OF PART-15
This device com lies with Part 15 of the FCC Rules. O eration is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must acce t any
interference received, including interference that may cause undesired o eration.
WARNING: Changes or modifications to this roduct not ex ressly a roved by the arty res onsible
for com liance could void the user’s authority to o erate this equi ment.
NOTE: This equi ment has been tested and found to com ly with the limits for a digital device,
ursuant to Part 15 of the FCC Rules. These limits are designed to rovide reasonable rotection
against harmful interference in a residential installation. This equi ment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a articular installation. If this equi ment does cause harmful
interference to radio or television rece tion, which can be determined by turning the equi ment off
and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
- Reorient or relocate the receiving antenna.
- Increase the se aration between the equi ment and receiver.
- Connect the equi ment into an outlet on a circuit different from that to which the receiver is
connected.
- Consult the dealer or an ex erienced radio TV technician for hel .
This equi ment com lies with FCC radiation ex osure limits set forth for an uncontrolled
environment. This equi ment should be installed and o erated with minimum distance 20cm between
the radiator and your body. This Transceiver must not be co-located or o erating in conjunction with
any other antenna or Transceiver.
Disclaime
The info mation within this document has been ca efully checked and is believed to be enti ely
eliable. Howeve , no esponsibility is assumed fo inaccu acies. Lathem Time Co p. ese ves the
ight to make changes to any p oducts he ein to imp ove eliability, function, o design.

Page 1
Int oduction
The AirTime AT-DDC Wireless Digital Dis lay Wall Clock is designed with
a 4-inch red LED dis lay that can be viewed from distances over 100
feet. The bright red dis lay shows the hour and minutes and can be
configured for a 12 or 24 Hour format.
The AT-DDC Wall Clock is synchronized by a Lathem ATX series
transceiver’s wireless correction signal.
The AT-DDC Wall Clock can be mounted directly to a wall, to a single
gang outlet box or, with o tional mounting kits, as double-faced units
from the wall or ceiling.
Clock Ope ation
When the AT-DDC Wall Clock is connected to 110vAC ower, the clock
dis lays 12:00 AM and begins listening for a signal from an ATX series
transceiver. U on rece tion of the AirTime signal, (verified by a red
LED flashing in the lower right corner), the clock will adjust to the
correct time. The clock will continue to listen and correct itself as
needed.
Powe Co d Installation
A 3 wire grounded ower cord is required. If the ower cord will not be
in conduit, secure the ower cord with a cable clam into the selected
vent ca .
Remove the two hilli s head screws from the left or the right end ca
and remove. Slide the circuit board out of the case. Carefully fli the
circuit board over and lay it face down on a clean, smooth work
surface. Remove one of the vent ca s from the case of the wall clock
and route the ower cord through it to the back of the circuit board. (If
the ower cord will be routed through the back of the clock using
conduit, route the cord through the gang box and conduit access hole
to the back of the circuit board assembly). Stri away 1/2" of the
rotective shield from each wire of the ower cord. Locate the two
black wires leading from the back of the circuit board. Using wire nuts,
attach the AC In line of the cord to one and the AC Return line to the
other (normally black is AC In and white is AC Return). Attach the
ground wire of the cord, (normally green) to the green ground screw
located on the inside back of the case. Slide the circuit board back into
the case, re lace the end ca and secure with the two hilli s head
screws.

Page 2
Time Fo mats
The AT-DDC4 Series Wall Clocks can be set to dis lay in 12 Hour or 24
Hour format. When in 12 Hour format, a red LED in the u er left
corner of the dis lay indicates PM hours. When in 24 Hour format, the
hours are dis lays in Military style.
F ont Panel
To set the dis lay format, use the jum er (J1) located on the back of
the circuit board which can be accessed by removing the right side end
ca and sliding the circuit board out slightly.
Back Side of Ci cuit Boa d
Jumper J1
On = 12 Hour display
Off = 24 Hour display

Page 3
12 Hou Fo mat
AM PM
24 Hou Fo mat
AM PM

Page 4
Mounting
The AT-DDC Wall Clock can be mounted directly to a wall, to a single
gang outlet box, double hung from the wall or double hung from the
ceiling. When deciding where the clock will be mounted, kee in mind
that 115VAC ower is required.
Mounting to a Wall
Tools required for mounting the clock:
Drill with a 5/16" bit
Hammer
Philli s head screwdriver
Wall anchors
Pencil
»After deciding the location where the clock will be mounted,
make two marks 12" a art and horizontal.
Note: If mounting near a ceiling, make sure the holes are at least
2 1/4" away from the ceiling.
Note: Make sure you have at least 1 " of side clearance on one side in
order to remove the front panel.
»Drill a 5/16" hole at each mark
»Insert a wall anchor and ta it flush to the wall with the
hammer.
»Insert a screw into each wall anchor leaving 1/4" ex osed.
»Remove the two hilli s head screws from the left or the right
end ca and remove. Slide the front anel assembly out of the
case and set aside.
»Line u the two keyholes on the back of the case and sli over
the two screws and tighten securely. ( The lower mounting
holes can be marked at this oint, the case removed, holes
drilled and wall anchors installed if so desired)
»Slide the front anel dis lay back into the case, re lace the
end ca and secure with the two hilli s head screws.

Page 5
Mounting to a Single Gang Box
Two mounting holes have been located in the center of the case 2 1/4"
a art for mounting to a single gang wall box. A 7/8" hole has been
laced between the mounting holes that will acce t conduit if desired.
Note: If mounting near a ceiling, make sure the top of the single gang
box is at least 2 1/4" away from the ceiling.
Note: Make sure you have at least 1 " of side clearance on one side in
order to remove the front panel.
»Remove the two hilli s head screws from the left or the right
end ca and remove. Slide the front anel assembly out of the
case and set aside. Remove the desired vent ca that any
»Line the two holes in the case u to the single gang box and
insert ro er screws for the single gang box and tighten
securely.
»Slide the front anel dis lay back into the case, re lace the
end ca and secure with the two hilli s head screws.

Page 6
Double Mount – Wall
The AT-DDC requires o tional mounting kit (SAM0625)
Tools required for mounting the clock:
Flat blade screwdriver
Philli s head screwdriver
15/16" o en end wrench
The double wall mount late attaches to a double or single gang box
installed securely in the wall. Required wiring should be available
through the gang box at time of installation.
»Remove the two chase ni les from the mounting late osts.
»Secure the mounting late securely to the gang box with the
ro er screws. (not su lied)
Note: The long dimension of the mounting plate must be perpendicular
to the ground to assure proper alignment of wall clocks.
Mounting - Wall
»Remove the two hilli s head screws from the left and the
right end ca s of the two DDC4 clocks and remove. Slide the
front anel assemblies out of the cases and set aside.
»Place the two DDC4 clocks back to back and secure by inserting
a #10 screw through the two key holes and the two lower
mounting holes using lock washers and nuts su lied with the
mounting kit.
»Attach the modified end ca to the end of the clocks that will
be attached to the wall mount late using the original end ca
screws.
»Align the holes of the end ca su ort late with the holes in
the modified end ca and secure with 4 #6 hilli s head screws
(su lied)

Page 7
»Line the two osts from the mounting late u with the two
holes of the modified end ca . Insert the chase ni les through
the holes of the modified end ca and secure to the mounting
late with a 15/16" wrench.
»Slide the front anel assemblies in artially. Secure the
required wiring and install the battery if used.
»Slide the front anel assemblies in fully. Install the end ca s
and secure each with its two screws.
»Discard or store the two original end ca s the modified end
ca s re laced.
mounting plate
#10 lock washers
#10 screws
end cap support
chase nipples
modified end caps
DDC4 cases
#10 lock washers
#10 hex nuts

Page 8
Double Mount - Ceiling
Requires o tional mounting kit (SAM0626)
Tools required for mounting the clock:
Flat blade screwdriver
Philli s head screwdriver
15/16" o en end wrench
The double ceiling mount late attaches to a double or single gang box
installed securely in the ceiling. Required wiring should be available
through the gang box at time of installation.
»Remove the two chase ni les from the mounting late osts.
»Secure the mounting late securely to the gang box with the
ro er screws. (not su lied)
Note: When mounting AT-DDC4 clocks, the long dimension of the
mounting plate must be parallel to the long side of the clocks.
Mounting - Ceiling
Note: Make sure you have at least 1 " of side clearance on one side in
order to remove the front panel assembly.
»Remove the two hilli s head screws from the left and the
right end ca s of the two DDC4 clocks and remove. Slide the
front anel assemblies out of the cases and set aside.
»Place the two DDC4 clocks back to back and secure by inserting
a #10 screw through the two key holes and the two lower
mounting holes using lock washers and nuts su lied with the
mounting kit. Note: At this point, if the DDC4 clocks will be
mounted too near a wall on one side to secure the end caps,
install the "wall side" end caps now.
»Remove the center vent ca from the to of each DDC4 clock.
»Line the two osts from the mounting late u with the vent
holes of the DDC4 clocks. Insert the chase ni les through the
vent holes and secure to the mounting late with a 15/16"
wrench.
»Slide the front anel assemblies in artially. Secure the
required wiring and install the battery if used.
»Slide the front anel assemblies in fully. Install the end ca s
and secure each with its two screws.