Lathem DDC4, DDC2 User Manual 2

Digital Display Wall Clock

DDC2 / DDC4 Series

Installation &

User's Guide

OMNI:CHRON, mini:master, Lathem and the Lathem logo are registered trademarks of Lathem Time Corporation. Other product names mentioned in this manual may be trademarks of their respective companies and are hereby acknowledged.

WARNING: Changes or modifications to this product not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

NOTICE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment 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 particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment 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 separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio TV technician for help.

This Class B digital apparatus complies with Canadian ICES-003.

Cet appareil numerique de la classe B est conforme a la norme NMB-003 du Canada.

Lathem Time Corporation

200 Selig Drive, SW

Atlanta, GA 30336

www.lathem.com

Document Number: USG0028D

Revised 11-19-2004

Table of Contents

Introduction..................................................................................................................................................... 1

Clock Operation.............................................................................................................................................. 1

About this Manual ..........................................................................................................................................2

Optional Accessories ......................................................................................................................................3

Configuring the DDC Series Wall Clock........................................................................................................ 4

Setting the DIP Switches - DDC2 / DDC4 Series.......................................................................................5

DDC2...................................................................................................................................................... 5

DDC4...................................................................................................................................................... 5

DIP Switch Settings ................................................................................................................................ 6

Configuring RS485 Communications - DDC2/4-RS Series ........................................................................... 7

DDC2-RS.................................................................................................................................................... 7

DDC4-RS.................................................................................................................................................... 7

Battery Usage - DDC2 / DDC4 Series............................................................................................................ 7

DDC2/4-RS / DDC2/4-RS-24..................................................................................................................... 7

Battery Installation - DDC2 / DDC4 Series.................................................................................................... 8

DDC2.......................................................................................................................................................... 8

DDC4.......................................................................................................................................................... 8

Power Cord Installation - DDC2/4-RS ........................................................................................................... 8

DDC2-RS.................................................................................................................................................... 8

DDC4-RS.................................................................................................................................................... 9

Wiring Installation - DDC2/4-RS Series......................................................................................................... 9

Secondary Wiring ....................................................................................................................................... 9

RS485 Wiring ............................................................................................................................................. 9

DDC-TC Wiring ......................................................................................................................................... 9

Replacing an Existing DDC4 Wall Clock................................................................................................. 10

Board Layout Diagram .............................................................................................................................10

Mounting - DDC2 / DDC4 Series................................................................................................................. 11

Mounting to a Wall ................................................................................................................................... 11

DDC2.................................................................................................................................................... 11

DDC4.................................................................................................................................................... 12

Mounting to a Single Gang Box ...............................................................................................................12

DDC2.................................................................................................................................................... 13

DDC4.................................................................................................................................................... 13

Double Mount - Wall.................................................................................................................................... 14

DDC2 (Double Mount - Wall).............................................................................................................. 15

DDC4 (Double Mount - Wall).................................................................................................................. 16

Double Mount - Ceiling ............................................................................................................................ 16

Double Mount - Ceiling ............................................................................................................................ 17

DDC4 (Double Mount - Ceiling) .......................................................................................................... 19

Setting the Time............................................................................................................................................ 20

Time Formats............................................................................................................................................ 20

12 Hour Format..................................................................................................................................... 20

24 Hour Format..................................................................................................................................... 20

Appendix A - DDC2-RS / 4-RS Secondary Clock Wiring Diagrams........................................................... 21

Stand-Alone (115VAC) ............................................................................................................................ 21

3-Wire Synchronous (115VAC) ............................................................................................................... 22

3-Wire Synchronous (24VAC) ................................................................................................................. 23

3-Wire minute Impulse (59th Minute) ....................................................................................................... 24

3-Wire Minute Impulse (59th Minute With 12 Hour Correction).............................................................. 25

Standard Electric Synchronous................................................................................................................. 26

Standard Electric AR-2A 2-Wire Dual Voltage........................................................................................27

Standard Electric AR-2 2-Wire Dual Voltage...........................................................................................28

Synchronous Wired................................................................................................................................... 29

Simplex 59th Minute Dual Motor..............................................................................................................30

Simplex 45th Minute Dual Motor..............................................................................................................31

Edwards Dual Motor................................................................................................................................. 32

Standard Electric AR-3 3-Wire Minute Impulse.......................................................................................33

National Synchronous Wired.................................................................................................................... 34

Stromberg Synchronous Wired (56th Minute)........................................................................................... 35

Cincinnati D1............................................................................................................................................ 36

Cincinnati D6, Edwards 2406 ................................................................................................................... 37

2-Wire Pulse Alternating (24VDC) ..........................................................................................................38

Electronic Coded....................................................................................................................................... 39

Straight Frequency.................................................................................................................................... 40

3-Wire Minute Impulse (58th Minute)....................................................................................................... 41

3-Wire Minute Impulse (44th Minute)....................................................................................................... 42

2-Wire Reverse Polarity Minute Impulse (59th Minute) ...........................................................................43

Appendix B - DDC2-RS-24 / DDC4-RS-24 Wiring.....................................................................................44

DDC2-RS-24 / DDC4-RS-24 Wiring ....................................................................................................... 45

Appendix C - RS485 Wiring Diagrams ........................................................................................................ 46

RS485 Data Format...................................................................................................................................46

OMCII to DDC2-RS / 4-RS...................................................................................................................... 47

LTR0 to DDC2-RS / 4-RS........................................................................................................................ 48

LTR4 / 8-512 to DDC2-RS / 4-RS............................................................................................................49

Appendix D - DDC-TC Timer Control Panel............................................................................................... 50

Wiring ....................................................................................................................................................... 50

Installation ................................................................................................................................................51

Operation ..................................................................................................................................................52

As a Count Up Timer............................................................................................................................ 52

As a Count Down Timer....................................................................................................................... 52

Appendix E - LTR-GPS Satellite Receiver / Clock Synchronizer................................................................ 53

Connecting to a Lathem DDC2-RS or DDC4-RS Digital Clock .......................................................... 55

Appendix F - Specifications..........................................................................................................................56

Appendix G - Warranty ................................................................................................................................57

Page 1 Digital Display Wall Clock Guide

Introduction

The Digital Display Series Wall Clocks are designed with 2-inch or 4-inch red LED displays that can be viewed from great distances; the 4-inch model as far away as 100 feet, the 2-inch model from as far away as 50 feet. The bright red display shows the hour and minutes and can be configured for a 12 or 24 hour format. By the setting of internal DIP switches, the DDC Series Wall Clocks can be configured to run as "stand-alone" or to replace many analog secondary clocks that may be hard to find or no longer available.

The DDC Series Wall Clocks can be synchronized from the Lathem LTR4-512 or LTR8-512 Master, LTR0 mini:master, Terminal Manager Software or the OMNI:CHRON Time Clock, using an RS485 correction signal.

The DDC Series Wall Clocks with the optional DDC-TC Timer Control Panel allow the DDC Series Wall Clocks to act as a count up or count down timer as well as displaying the normal time. The optional Timer Control Panel is required to use this feature.

The DDC Series Wall Clocks can be mounted directly to a wall, to a single gang outlet box or, with optional mounting kits, as double-faced units from the wall or ceiling.

During power failures, a 9-Volt alkaline battery (not supplied) can maintain the DDC Series Wall Clock's internal time keeping (although the display is blank during power failures).

Clock Operation

When the Digital Display Series Wall Clocks are set to operate as stand-alone or synchronous wired secondary clocks, the time base is derived from the AC power source. The frequency (50Hz or 60Hz) is automatically detected when power is applied. The clocks then initialize to 12:00AM and maintain time by counting the line frequency. Corrective clocks will begin synchronization routines. Accuracy is related directly to the accuracy of the line frequency. With the DDC-TC option, the Digital Display Series Wall Clocks can act as a count up or count down timer as well as running as a stand-alone or synchronous wired secondary clock.

When the Digital Display Series Wall Clocks are set to operate as impulse secondary clocks, the master clock controls time totally. Time will only advance when pulses are received from the master clock. Should the master clock lose power, the wall clocks would hold at the time that the last pulse was received until power to the master clock is restored and pulses continue. With the DDC-TC option, the Digital Display Series Wall Clocks can act as a count up or count down timer as well as running as an impulse secondary clock.

Digital Display Wall Clock Guide Page 2

About this Manual

This manual will guide you through the installation, setup and wiring of your DDC Series Wall Clock. This manual covers the four available DDC Series models. The available models and their descriptions are:

DDC2-RS / DDC4-RS Equipped with a 2-inch or 4-inch display, these models can operate as a stand-

alone, a secondary clock to virtually any master controlled system or can be synchronized with the RS485 signal from the Lathem LTR4-512 or LTR8-512 Master, LTR0 mini:master, Terminal Manager Software* or the OMNI:CHRON Time Clock.

DDC2-RS-24 / DDC4-RS-24 Same as above, models with the "-24" suffix have an optional power

transformer that allows for 24VAC operation. These models are designed to be powered from an external, 24VAC-power supply for use in installations where local 115VAC power may not available.

* The Lathem SWIFT-485 plus is required for RS485 synchronization.

Page 3 Digital Display Wall Clock Guide

Optional Accessories

VSE0050 Power Cord, 6 feet. DDC Series Wall Clocks are shipped without power cords. SAM0626 Double Ceiling Mount Kit for DDC2 or DDC4 Series SAM0630 Double Wall Mount Kit for DDC2 Series SAM0625 Double Wall Mount Kit for DDC4 Series VSE0052 Mounting Bracket for 3510 Hz Electronic Receiver. (DDC4 only, installer must

use optional method to mount Receiver outside the DDC2 if Receiver is used)

(Receiver not included) DDC-TC Timer Control Panel to use the DDC2/4 Series as a count up/down timer LTR4-512 LTR8-512 LTR8-512M Master Clocks capable of synchronizing the DDC Series Wall Clocks as well as

many other brands and types of wall clocks. Available configurations include 8,

6, 4 and 2 bell circuits Mlink Master Link software for remote programming of the LTR8-512 and LTR8-

512M Master Clocks SWIFT-485 plus RS232 to RS485 signal converter for use with Master Link to extend the

distance of Master Clocks up to 4000'.

Digital Display Wall Clock Guide Page 4

SAM0626 Kit (left) Includes:

1 - Mounting Plate Assembly 2 - Chase Nipples 4 - #10 Screws 8 - #10 Lock Washers 8 - #10 Hex Nuts

SAM0630 Kit (middle) Includes:

1 - Mounting Plate Assembly 2 - Modified End Caps 2 - Chase Nipples 4 - #10 Screws 8 - #10 Lock Washers 4 - #10 Hex Nuts

SAM0625 Kit (right) Includes:

1 - Mounting Plate Assembly 2 - Modified End Caps 1 - End Cap Support 2 - Chase Nipples 4 - #10 Screws 8 - #10 Lock Washers 4 - #10 Hex Nuts 4 - #6 Screws 4 - #6 Lock Washers 4 - #6 Hex Nuts

Page 5 Digital Display Wall Clock Guide

Configuring the DDC Series Wall Clock

Setting the DIP Switches - DDC2 / DDC4 Series

DDC2

DDC4

Remove the two phillips head screws from the left or the right end cap and remove. Slide the front panel assembly out of the case. Carefully flip the front panel assembly over and lay it face down on a clean, smooth work surface. Locate switch S1near the center of the circuit board and set the DIP switches (See figure1below) according to Tables 1, 2 and 3 on the following page for the proper configuration. Slide the front panel display back into the case, replace the end cap and secure with the two phillips head screws.

Switch S1

Default Shown - Stand Alone

Switches 1 - 5

Secondary Clock Type

3 4 5

OPEN

Switches 6 & 7

Baud Rate

Default Shown - 9600 Baud

= Depressed Side of Switch

Figure 1

Switch 8

12 or 24 Hour Format

Default Shown - 12 Hour

Digital Display Wall Clock Guide Page 6

DIP Switch Settings

Table 1 - S1 (1-5) Secondary Clock Correction

1 2 3 4 5 Secondary Clock Selection

0=Closed 1=Open *=Factory Default

0 0 0 0 0 Stand Alone * 1 0 0 0 0 3-Wire Synchronous 0 1 0 0 0 3-Wire Minute Impulse (59th Minute) 1 1 0 0 0 3-Wire Minute Impulse (59th Minute) With 12 Hour Correction 0 0 1 0 0 Standard Electric Synchronous 1 0 1 0 0 Standard Electric AR-2A - 2-Wire Dual Voltage 0 1 1 0 0 Standard Electric AR-2 - 2-Wire Dual Voltage 1 1 1 0 0 Cincinnati D8, Honeywell ST402A, Faraday Synchronous 0 0 0 1 0 Simplex 59th Minute Dual Motor 1 0 0 1 0 Simplex 45th Minute Dual Motor 0 1 0 1 0 Edwards Dual Motor 1 1 0 1 0 Standard Electric AR-3 - 3-Wire Minute Impulse 0 0 1 1 0 National Synchronous Wired 1 0 1 1 0 Stromberg Synchronous Wired 0 1 1 1 0 Cincinnati D1 1 0 0 0 1 Cincinnati D6, Edwards 2406 0 1 0 0 1 2-Wire Impulse Alternating (24VDC) 1 1 0 0 1 Electronic Coded (3510 Hz Receiver Required) 0 0 1 0 1 Straight Frequency (3510 Hz Receiver Required) 1 0 1 0 1 3-Wire Minute Impulse (58th Minute) 0 1 1 0 1 3-Wire Minute Impulse (44th Minute) 1 1 1 0 1 2-Wire Reverse Polarity Minute Impulse (59th Minute)

Table 2 - S1 (6-7) RS 485 Baud Rate

6 7 Baud Rate

0=Closed 1=Open

0 0 1200 Baud 1 0 2400 Baud 0 1 4800 Baud 1 1 9600 Baud *

Table 3 - S1 (8) 12 / 24 Hour Display

8 12 / 24 Hour Display

0=Closed 1=Open

1 12 Hour * 0 24 Hour

Note: When switches 1-5 are set for any secondary type other than Stand-Alone, the display is forced to 12 Hour and the PM indicator does not illuminate.

Page 7 Digital Display Wall Clock Guide

Configuring RS485 Communications - DDC2/4-RS Series

When multiple DDC2 (4)-RS Series Wall Clocks are installed as slave units to either the Lathem LTR4512 or LTR8-512 Master, LTR0 Mini-Master, Terminal Manager Software or the OMNI:CHRON Time Clock, the last clock on the line must have a shunt installed over both pins at position J2 (see figure 2, page

9). When shipped, the shunt is placed over only one pin of position J2 in an "open" setting. It is necessary to place the shunt over both pins of position J2 and create a "closed" setting for the last clock on the line.

DDC2-RS

Remove the four phillips head screws from the left or the right end cap and remove. Slide the lens and circuit board assembly out of the case. Place the lens aside and carefully flip the circuit board assembly over and lay it face down on a clean, smooth work surface. Locate position J2 on the left, upper side of the back of the circuit board assembly (see figure 2, page 9). Lift the shunt straight up off the single pin of position J2. Align the shunt to cover both pins of position J2 and press firmly into place. Slide the lens and circuit board assembly back into the case, replace the end cap, and secure with the four phillips head screws.

DDC4-RS

Remove the two phillips head screws from the left or the right end cap and remove. Slide the front panel assembly out of the case. Carefully flip the front panel assembly over and lay it face down on a clean, smooth work surface. Locate position J2 on the left, upper side of the back of the front panel. (See figure 2, page 9) Lift the shunt straight up off the single pin of position J2. Align the shunt to cover both pins of position J2 and press firmly into place. Slide the front panel display back into the case, replace the end cap and secure with the two phillips head screws.

Note: Only the LAST clock on the line needs position J2 "closed". Leave all other clocks "open".

Battery Usage - DDC2 / DDC4 Series

Depending on the secondary selection type, the 9-Volt alkaline battery (not included) performs different functions and may be required for proper operation.

DDC2/4-RS / DDC2/4-RS-24

When used as a secondary type clock the 9-Volt alkaline battery (not included) will retain the time that the power failure occurred, although the display will go blank. When power is restored, correction signals from the master clock will advance the wall clock to the proper time. When used as a secondary type clock in systems that do not provide a 12-Hour correction signal, the 9-Volt alkaline battery (not included) is required for proper operation. Without the 9-Volt alkaline battery (not included), the wall clock will reset to 12:00 AM after power resumes and will not receive the proper signal from the master clock to fully correct.

Digital Display Wall Clock Guide Page 8

When used as a RS485 clock, the master clock will send a signal to the wall clock every minute. The 9Volt alkaline battery (not included) is optional in these types of installations.

Battery Installation - DDC2 / DDC4 Series

DDC2

Remove the four phillips head screws from the left or the right end cap and remove. Slide the lens and circuit board assembly out of the case. Place the lens aside and carefully flip the circuit board assembly over and lay it face down on a clean, smooth work surface. Locate the Battery Cradle on the upper right corner of the circuit board assembly. (See figure 2, page 9) Slide the battery into the cradle making sure the Positive and Negative connections of the battery and cradle match. Snap the battery onto the connections located inside the battery cradle. Slide the lens and circuit board assembly back into the case, replace the end cap and secure with the four phillips head screws.

DDC4

Remove the two phillips head screws from the left or the right end cap and remove. Slide the front panel assembly out of the case. Carefully flip the front panel assembly over and lay it face down on a clean, smooth work surface. Locate the Battery Cradle on the upper right corner of the circuit board assembly. (See figure 2, page 9) Slide the battery into the cradle making sure the Positive and Negative connections of the battery and cradle match. Snap the battery onto the connections located inside the battery cradle. Slide the front panel display back into the case, replace the end cap and secure with the two phillips head screws.

Power Cord Installation - DDC2/4-RS

Note: This section refers only to the 115VAC models. Applying power other than 24VAC to models DDC2RS-24 or DDC4-RS-24 WILL CAUSE DAMAGE and void the warranty. See Appendix B for proper wiring of these models.

DDC2-RS

Remove the four phillips head screws from the left or the right end cap and remove. Slide the lens and circuit board assembly out of the case. Place the lens aside and carefully flip the circuit board assembly over and lay it face down on a clean, smooth work surface. Remove one of the vent caps from the case of the wall clock and route the power cord through it to the back of the circuit board assembly. (If the power cord will be routed through the back-of-the-clock conduit access, route the cord through the gang box and conduit access hole to the back of the circuit board assembly). Strip away 1/2" of the protective shield from each wire of the power cord. Locate the two black wires leading from J1 (see figure 2, page 9) and 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

Page 9 Digital Display Wall Clock Guide

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 lens and circuit board assembly back into the case, replace the end cap and secure with the four phillips head screws.

DDC4-RS

Remove the two phillips head screws from the left or the right end cap and remove. Slide the front panel assembly out of the case. Carefully flip the front panel assembly over and lay it face down on a clean, smooth work surface. Remove one of the vent caps from the case of the wall clock and route the power cord through it to the back of the display panel. (If the power cord will be routed through the back-of-theclock conduit access, route the cord through the gang box and conduit access hole to the back of the circuit board assembly). Strip away 1/2" of the protective shield from each wire of the power cord. Locate the two black wires leading from J1 (see figure 2, page 9) and 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 front panel display back into the case, replace the end cap and secure with the two phillips head screws.

Wiring Installation - DDC2/4-RS Series

Secondary Wiring

The DDC Wall Clock comes with a detachable wiring harness to make installation easier. The wiring harness can be removed from the back of the main circuit board at position J1 as shown in figure 2 so wiring from the master clock can be attached to the wiring harness with the clock's Electronic Assembly removed. The leads from the wiring harness should be connected as shown in the diagrams in Appendix A.

RS485 Wiring

The DDC Wall Clock comes with a detachable wiring block to make installation easier. The wiring block can be removed from the back of the main circuit board at position JP4 as shown in figure 2 so wiring from the master clock can be attached without the need of holding the Wall Clock itself. Wiring should be connected as shown in the diagrams in Appendix C.

DDC-TC Wiring

The DDC Wall Clock comes with a detachable wiring block to make installation easier. The wiring block can be removed from the back of the main circuit board at position JP2 as shown in figure 2 so wiring from the Timer Control Panel can be attached without the need of holding the Wall Clock itself. Wiring should be connected as shown in the diagrams in Appendix D.

Digital Display Wall Clock Guide Page 10

Replacing an Existing DDC4 Wall Clock

When replacing an older style DDC4 Wall Clock it will be necessary to remove any connectors used by the older style clock and attach the wires to the new DDC Series Wall Clock as described above.

Board Layout Diagram

Hours Minutes Up Down

Ground Beeper DD+

Factory Default

Fly Lead Connector

JP2

JP4

Off

JP1

Jumper

DIP Switch

123 4 567

OPEN

Lathem Time Corp. DDC2\4 (E-PROM)

Install shunt on

last clock for RS485 connections

Figure 2

9VDC Alkaline Battery

Cradle

- +

JP3

Page 11 Digital Display Wall Clock Guide

Mounting - DDC2 / DDC4 Series

The DDC Series Wall Clocks 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, keep in mind that 115VAC power may be required depending on the installation type.

See page 14, figure 3.

Mounting to a Wall

Tools required for mounting the clock:

Drill with a 5/16" bit Hammer Phillips head screwdriver Wall anchors Pencil

DDC2

» After deciding the location where the clock will be mounted, make two marks 7" apart 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 10 1/2" of side clearance on one side in order to remove the lens and circuit board assembly.

» Drill a 5/16" hole at each mark » Insert a wall anchor in each hole and tap it flush to the wall with the hammer. » Insert a screw into each wall anchor leaving 1/4" exposed. » Remove the four phillips head screws from the left or the right end cap and remove. Slide the lens

and circuit board assembly out of the case and set aside.

» Line up the two keyholes on the back of the case and slip over the two screws and tighten

securely. ( The lower mounting holes can be marked at this point, the case removed, holes drilled and wall anchors installed if so desired)

» Remove the desired vent cap that any required wiring will route through. (If the wiring will be

installed through the back-of-the-clock conduit access, route the fly leads of the clock's Cable Harness Assembly from the interior of the clock through the hole in the Clock's rear plate. Use wire nuts or crimp connectors to join these leads with the power and synch signal cable in the gang box behind the clock to eliminate possible snagging when the circuit board assembly is removed or replaced. If RS-485 signaling is used, attach the signal pair to the mini Terminal Block Plug and pass the cable from behind the clock, through the hole into the clock's interior).

» Route the 6-position plug (and optional RS485 cable) to the circuit board assembly and attach.

Digital Display Wall Clock Guide Page 12

» Slide the lens and circuit board assembly back into the case, replace the end cap and secure with

the four phillips head screws.

DDC4

» After deciding the location where the clock will be mounted, make two marks 12" apart 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 16" 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 tap it flush to the wall with the hammer. » Insert a screw into each wall anchor leaving 1/4" exposed. » Remove the two phillips head screws from the left or the right end cap and remove. Slide the front

panel assembly out of the case and set aside.

» Line up the two keyholes on the back of the case and slip over the two screws and tighten

securely. ( The lower mounting holes can be marked at this point, the case removed, holes drilled and wall anchors installed if so desired)

» Remove the desired vent cap that any required wiring will route through. (If the wiring will be

Plug and pass the cable from behind the clock, through the hole into the clock's interior). » Route the 6-position plug (and optional RS485 cable) to the circuit board assembly and attach. » Slide the front panel display back into the case, replace the end cap and secure with the two

phillips head screws.

Mounting to a Single Gang Box

Two mounting holes have been located in the center of the case 2 1/4" apart for mounting to a single gang wall box. A 7/8" hole has been placed between the mounting holes that will accept conduit if desired.

See page 14, figure 3.

Page 13 Digital Display Wall Clock Guide

DDC2

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 10 1/2" of side clearance on one side in order to remove the lens and circuit board assembly.

» Remove the four phillips head screws from the left or the right end cap and remove. Slide the lens

and circuit board assembly out of the case and set aside. » Remove the desired vent cap that any required wiring will route through. (If the wiring will be

installed through the back-of-the-clock conduit access, route the fly leads of the clock's Cable

Harness Assembly from the interior of the clock through the hole in the Clock's rear plate. Use

wire nuts or crimp connectors to join these leads with the power and synch signal cable in the

gang box behind the clock to eliminate possible snagging when the circuit board assembly is

removed or replaced. If RS-485 signaling is used, attach the signal pair to the mini Terminal Block

Plug and pass the cable from behind the clock, through the hole into the clock's interior). » Line the two holes in the case up to the single gang box and insert proper screws for the single

gang box and tighten securely. » Route the 6-position plug (and optional RS485 cable) to the circuit board assembly and attach. » Slide the lens and circuit board assembly back into the case, replace the end cap and secure with

the four phillips head screws.

DDC4

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 16" of side clearance on one side in order to remove the front panel.

» Remove the two phillips head screws from the left or the right end cap and remove. Slide the front

panel assembly out of the case and set aside. » Remove the desired vent cap that any required wiring will route through. (If the wiring will be

installed through the back-of-the-clock conduit access, route the fly leads of the clock's Cable

Harness Assembly from the interior of the clock through the hole in the Clock's rear plate. Use

wire nuts or crimp connectors to join these leads with the power and synch signal cable in the

gang box behind the clock to eliminate possible snagging when the circuit board assembly is

removed or replaced. If RS-485 signaling is used, attach the signal pair to the mini Terminal Block

Plug and pass the cable from behind the clock, through the hole into the clock's interior). » Line the two holes in the case up to the single gang box and insert proper screws for the single

gang box and tighten securely. » Route the 6-position plug (and optional RS485 cable) to the circuit board assembly and attach.

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