Bard D48L2P/BLD.10309, D36L2P/BLD.10305, D60A2P/BLD.10310, D60L2P/BLD.10303, D42A2P/BLD.10306 Installation And Service Instructions Manual

INSTALLATION AND SERVICE

INSTRUCTIONS

&

REPLACEMENT PARTS MANUAL

DC FREE COOLING UNIT SYSTEM

TWO (2) D-SERIES DUAL-TEC™

WALL-MOUNTED PACKAGE

AIR CONDITIONERS

&

ONE (1) BARD-LINKTM PLC

LEAD/LAG CONTROLLER

AIR CONDITIONER MODELS

D36A2P/BLD.10304 D36L2P/BLD.10305
D42A2P/BLD.10306 D42L2P/BLD.10307
D48A2P/BLD.10308 D48L2P/BLD.10309
D60A2P/BLD.10310 D60L2P/BLD.10303

CONTROLLER MODELS

LC1000-100/BLD.10293
LC1500-100/BLD.10291

NOTE: BARD-LINKTM LC1000-1000 or LC1500-100 Controllers must be used

with D-Series Wall-Mount Units

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

www.bardhvac.com

Manual : 2100-620A
Supersedes: 2100-620
Date: 3-25-15

Page 1 of 107

CONTENTS

SECTION 1: Installation Instructions ......................................................................................................... 7

List of Necessary Materials/Tools .........................................................................................................................8

Site Preparation .................................................................................................................................................9

Wall-Mount Unit Installation .............................................................................................................................11

Wall-Mount Unit Supply Wiring ..........................................................................................................................15

Preliminary Start-Up .........................................................................................................................................19

Bard-LinkTM Controller Installation .....................................................................................................................20

System Start-Up ..............................................................................................................................................36

SECTION 2: Service Instructions ............................................................................................................... 39

General Refrigerant Information .........................................................................................................................40

Sequence of Operation .....................................................................................................................................42

Advanced Programming ....................................................................................................................................49

Using the TEC-EYE ..........................................................................................................................................54

Componentry Specifications ..............................................................................................................................57

Maintenance and Troubleshooting ......................................................................................................................64

SECTION 3: Parts Manual ............................................................................................................................ 73

D-Series Wall-Mount Unit .................................................................................................................................74

Bard-LinkTM PLC Lead/Lag Controller ..................................................................................................................88

SECTION 4: Appendices .............................................................................................................................. 91

Appendix 1: LC-Series Controller Architecture .....................................................................................................92

Appendix 2: TEC-EYE Architecture ....................................................................................................................99

FIGURES AND TABLES

Figure 1.1 Wall-Mount Unit Model Nomenclature ......8

Figure 1.2 Dimensions ..........................................10

Figure 1.3 Mounting Instructions ...........................12

Figure 1.4 Electric Heat Clearance .........................13

Figure 1.5 Wall Mounting Instructions ....................13

Figure 1.6 Wall Mounting Instructions ....................14

Figure 1.7 Common Wall Mounting Installations ......14

Figure 1.8 Circuit Routing Label ............................16

Figure 1.9 WIRING:
Figure 1.10 Adjusting the 230/208VAC Transformer ..17
Figure 1.11 WIRING:

Figure 1.12 Bard Polarity-Voltage Monitor .................18

Figure 1.13 WIRING:

Figure 1.14 Remote Temperature Sensor Install ........22

Figure 1.15 Additional Remote Temp Sensor Install ...23
Figure 1.16 Power and Signal Connections – Smoke ..24

Figure 1.17 Power/Signal Connections – Hydrogen ....25

Figure 1.18 LC1000/LC1500 Generator Run ............25

Figure 1.19 WIRING:
Figure 1.20 WIRING:

Figure 1.21 WIRING: Communication Wiring ............28

Figure 1.22 WIRING: Communication Wiring:

Controller Termination ........................... 29

Figure 1.23 WIRING: Communication Wiring:

1st Unit Termination ............................. 30

Figure 1.24 WIRING: Communication Wiring:

2nd Unit Termination ............................ 31

Figure 1.25 Controller Circuit Install ........................32

Figure 1.26 Controller Grounding Posts ....................32

Figure 1.27 WIRING:
Figure 1.28 WIRING:

Figure 1.29 Bard-LinkTM Controller Display ...............36

Figure 1.30 Clock/Scheduler Menu ..........................36

Figure 1.31 Status Display Showing Units "Online" ....36

Figure 1.32 Executing Run Test ............................... 37

VAC Supply Wiring Landing Points . 16

VDC Supply Wiring Landing Points . 17

Typical LC1000/LC1500 Wiring .. 20

LC1000 External Alarm Wiring .. 26
LC1500 External Alarm Wiring .. 27

LC1000/LC1500 Wiring Diagram .. 34
LC1500 Punch-Down Block Wiring 35

Figure 2.1 Refrigerant Sight Glass .........................41

Figure 2.2 Wall-Mount Unit Control Board ..............43

Figure 2.3 Controller Board and Terminal Block .......45

Figure 2.4 LC Series Controller Control Board .........46

Figure 2.5 Free Cooling Damper Operation ..............48

Figure 2.6 Bard-LinkTM Controller Display ...............49

Figure 2.7 Controller Status Display .......................50

Figure 2.8 TEC-EYE Display ..................................54

Figure 2.9 TEC-EYE Connection to Unit Control ......54

Figure 2.10 TEC-EYE Status Display ........................55

Figure 2.11 Fan Blade Setting .................................59

Figure 2.12 Dirty Filter Switch .................................59

Figure 2.13 Power Loss Relay Circuit .......................60

Figure 2.14 High Pressure Relay Circuit ...................60

Figure 2.15 Blower Motor Start Relay Circuit ............60

Figure 2.16 Unit Control Panel ................................61

Figure 2.17 WIRING: Unit Wiring Diagram ................62

Figure 2.18 Low Voltage Connections .......................63

Figure 2.19 Troubleshooting Motor Power Supply ......65

Figure 2.20 Troubleshooting Motor Start Command ...66

Figure 2.21 Troubleshooting Speed Voltage ...............66

Figure 2.22 VDC Polarity Check ...............................67

Figure 2.23 Verifying Incoming Voltage .....................68

Table 1.1 Electrical Specifications ..........................15

Table 1.2 Terminal Block Index ............................... 33

Table 1.3 Controller Default Settings .......................38

Table 2.1 Nominal Pressures ..................................41

Table 2.2 Blower Speed Voltage Chart .....................42

Table 2.3 Controller Default Settings .......................48

Table 2.4 Controller Programmable Features ............52

Table 2.5 Temp vs. Resistance of Temp Sensor. ........ 58

Table 2.6 Indoor Blower Performance ......................59

Table 2.7 Troubleshooting 48VDC Blower Motor ........65

Table 2.8 Blower Speed Voltage Chart .....................66

Manual 2100-620A
Page 2 of 107

GENERAL INFORMATION

DC FREE COOLING UNIT SYSTEM (DC-FCU)

The Bard DC Free Cooling Unit system is composed of two (2) D-Series DUAL-TEC™ wall-mounted air conditioners
matched with one (1) Bard-LinkTM PLC lead/lag controller. The D-Series, specifically engineered for the telecom
market, can provide outdoor air cooling during power loss situations through the use of onsite -48VDC positive
ground battery banks.

TM

NOTE: The Bard-Link

work together. The PLC controller cannot run other Bard models or other brands of systems, nor can other
controllers or thermostats run the D-Series wall-mount units. They are a complete system, and must be used
together.

WALL-MOUNT AIR CONDITIONER UNITS

The D-Series units operate on both VAC and VDC power under normal power supply conditions. If there is loss of VAC
power supply (shore and/or back-up generator) the unit will continue to operate as free cooling or ventilation system
using the shelter’s VDC power. The indoor blower and free cooling unit operate from -48VDC and no inverter is required.

The units will supply 100% of rated cooling airflow in free cooling mode with ability to exhaust the same amount
through the unit itself without any additional relief openings in the shelter.

Each of these units are fully charged with refrigerant and have auxilliary heat installed.

BARD-LINKTM PLC CONTROLLER

Two models: LC1000-100 and LC1500-100 (controllers and accessories included with controllers shown below).

PLC lead/lag controller and the D-Series wall-mount units are designed specifically to

LC1000-100 Series – New Shelters Only

TEC-EYE Hand-Held
Diagnostic Tool

Programmable Logic
Controller

Remote Temperature

Sensor with 35' Cable

LC1500-100 Series – EOL and All HVAC Replacement Projects

TEC-EYE Hand-Held
Diagnostic Tool

Programmable
Logic Controller
with Attached
66 Punch-Down
Block

Remote Temperature

Sensor with 35' Cable

Communication

EMI Filters

Communication
EMI Filters

VDC
Smoke
Detector

OPTIONAL
8301-061

VDC

Hydrogen

Detector

Manual 2100-620A
Page 3 of 107

The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians.

The refrigerant system is completely assembled and
charged. All internal wiring is complete.

The unit is designed for use with or without duct work.
Flanges are provided for attaching the supply and return
ducts.

These instructions explain the recommended method
to install the air cooled self-contained unit and the
electrical wiring connections to the unit.

These instructions and any instructions packaged with
any separate equipment required to make up the entire
air conditioning system should be carefully read before
beginning the installation. Note particularly “Starting
Procedure” and any tags and/or labels attached to the
equipment.

While these instructions are intended as a general
recommended guide, they do not supersede any national
and/or local codes in any way. Authorities having
jurisdiction should be consulted before the installation
is made. See Page 3 for information on codes and
standards.

Sizing of systems for proposed installation should be
calculated by AT&T-specific methods/software using
regional climatic data and standards. The air duct
should be installed in accordance with the Standards

of the National Fire Protection Association for the
Installation of Air Conditioning and Ventilating Systems
of Other Than Residence Type, NFPA No. 90A, and
Residence Type Warm Air Heating and Air Conditioning
Systems, NFPA No. 90B. Where local regulations are at

a variance with instructions, installer should adhere to
local codes.

Shipping Damage

Upon receipt of equipment, the cartons should be
checked for external signs of shipping damage. If
damage is found, the receiving party must contact
the last carrier immediately, preferably in writing,
requesting inspection by the carrier’s agent.

These units must remain in upright position at all
times.

ADDITIONAL PUBLICATIONS

These publications can help you install the air
conditioner or heat pump. You can usually find these
at your local library or purchase them directly from the
publisher. Be sure to consult current edition of each
standard.

National Electrical Code ...................... ANSI/NFPA 70

Standard for the Installation of Air Conditioning

and Ventilating Systems ...................ANSI/NFPA 90A

Standard for Warm Air Heating

and Air Conditioning Systems ............ANSI/NFPA 90B

Load Calculation for Residential Winter

and Summer Air Conditioning ............. ACCA Manual J

Duct Design for Residential Winter and Summer
Air Conditioning and Equipment Selection

....................................................... ACCA Manual D

For more information, contact these publishers:

Air Conditioning Contractors of America (ACCA)
1712 New Hampshire Ave. N.W.
Washington, DC 20009
Telephone: [phone]
Fax: [phone]

American National Standards Institute (ANSI)
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]

American Society of Heating, Refrigeration and Air
Conditioning Engineers, Inc. (ASHRAE)
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]

National Fire Protection Association (NFPA)
Batterymarch Park
P. O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]

Manual 2100-620A
Page 4 of 107

ANSI Z535.5 Definitions:

Danger: Indicate[s] a hazardous situation which, if

not avoided, will result in death or serious injury. The
signal word “DANGER” is to be limited to the most
extreme situations. DANGER [signs] should not be used
for property damage hazards unless personal injury risk
appropriate to these levels is also involved.

Warning: Indicate[s] a hazardous situation which, if
not avoided, could result in death or serious injury.
WARNING [signs] should not be used for property
damage hazards unless personal injury risk appropriate
to this level is also involved.

Caution: Indicate[s] a hazardous situation which, if
not avoided, could result in minor or moderate injury.
CAUTION [signs] without a safety alert symbol may be
used to alert against unsafe practices that can result in
property damage only.

Notice: [this header is] preferred to address practices
not related to personal injury. The safety alert symbol
shall not be used with this signal word. As an
alternative to “NOTICE” the word “CAUTION” without
the safety alert symbol may be used to indicate a
message not related to personal injury.

!

WARNING

Electrical shock hazard.

Have a properly trained individual perform
these tasks.

Failure to do so could result in electric shock
or death.

!

WARNING

Fire hazard.

Maintain minimum 1/4” clearance between the
supply air duct and combustible materials in

the rst 3’ feet of ducting.

Failure to do so could result in re causing
damage, injury or death.

!

WARNING

Heavy item hazard.

Use more than one person to handle unit.

Failure to do so could result in unit damage or
serious injury.

!

CAUTION

Cut hazard.

Wear gloves to avoid contact with sharp
edges.

Failure to do so could result in personal injury.

Manual 2100-620A
Page 5 of 107

Manual 2100-620A
Page 6 of 107

SECTION 1:

INSTALLATION

INSTRUCTIONS

Manual 2100-620A
Page 7 of 107

LIST OF NECESSARY MATERIALS/TOOLS

Additional hardware and miscellaneous supplies are needed for installation. These items are field supplied and must
be sourced before installation. This list also includes tools needed for installation.

LIST OF MATERIALS/TOOLS

• Personal protective equipment/safety devices

• Supply/return grilles

• Field-fabricated sleeves (if necessary)

• 5/16" diameter anchor/carriage/lag bolts

• 7/8" diameter washers

• Caulking materials

• Miscellaneous hand and power tools and jobsite or
shop materials

• Lifting equipment with the necessary capacity and
rigging to safely move/install the systems

• Electrical supplies

- Two (2) 20A circuit breakers for the shelter DC

power plant (one per wall-mount unit)

- One (1) 5A circuit breaker for the shelter DC

power plant (for the Bard-Link

TM

controller)

- Two (2) various size circuit breakers for

the shelter AC breaker box (see Table 1.1:
Electrical Specifications on page 15)

- High-voltage wire of various gauges (see Table

1.1)

- Communication wire: 2-wire, 18 gauge,

shielded with drain

- 18 gauge non-shielded wire for connecting

smoke detector (and hydrogen detector and/or
generator, if applicable) to controller

-

CAT 6 Ethernet cable of field-determined length
(for remote communication, if applicable)

- Miscellaneous electrical supplies including
rigid/flexible conduit and fittings, junction
boxes, wire connectors and supports

The following are required and must be sourced
prior to installation of these units.

• Two (2) 20A circuit breakers for the shelter DC
power plant (one per wall-mount unit)

• One (1) 5A circuit breaker for the shelter DC

TM

power plant (for the Bard-Link

controller)

Circuit breakers for Emerson Network Power (ENP)
power plants (used in most telecomm shelters built
today) are available directly through the following
distributors:

• Emerson Network Power: 440.288.1122

• Master Electronics: 888.473.5297 or

www.onlinecomponents.com

Emerson Network Power (ENP) Part Numbers

• 20A circuit breaker: P/N 101601

• 5A circuit breaker: P/N 101598

Always confirm the application before ordering.

D-Series DUAL-TEC™ Wall-Mount Unit Model Nomenclature

D 36 A 2 P A 05 4 P X X X J

MODEL

SERIES

CAPACITY

36 – 3 Ton

42 – 3½ Ton

48 – 4 Ton
60 – 5 Ton

A – Right Hand

L – Left Hand

REVISION

PLC

VOLTS & PHASE

A – 230/208-60-1
B – 230/208-60-3

05 – 5 KW
06 – 6 KW
09 – 9 KW

10 – 10 KW

Manual 2100-620A
Page 8 of 107

KW

FIGURE 1.1

-48VDC

Free Cooling

Unit

CONTROL MODULES

J – High Pressure Switch, Low Pressure
Switch, Compressor Control Module,
Low Ambient Control, Alarm Contacts,
Start Assist
C – J Module + Compressor Crankcase
Heater

COIL OPTIONS

X – Standard
3 – Phenolic Coated Evaporator and
Condenser

SPECIAL FEATURES

COLOR OPTIONS

X – Beige
1 – White
4 – Buckeye Gray

FILTER OPTIONS

P – 2-Inch Pleated (MERV 8)
M – 2-Inch Pleated (MERV 11)

SITE PREPARATION

NEW SHELTER INSTALLATION VS.
RETROFIT INSTALLATION

These installation instructions cover both new shelter
installations and retrofit installations. Each installation
is unique and may require special accomodations and
modifications. Although Bard Manufacturing follows a
long-established tradition of manufacturing equipment
using industry standard dimensions for building
penetration, it is occasionally necessary to move or
enlarge supply and return openings when replacing
non-standardized equipment in a retrofit application.

MINIMUM CLEARANCE

D-Series wall-mount air conditioners are available in
both right-hand access models and left-hand access
models. Right-hand access models have the heat strip
access panel, external circuit breakers access panel
and internal controls access panel on the right side of
the unit. Left-hand access models are a mirror image
of the right-hand access models, and allow two wall­mount units to be placed in relatively close proximity
and yet still allow complete acess for maintenance and
repair.

On side-by-side installations, maintain a minimum of
26" clearance on control side to allow access to control
panel and heat strips, and to allow proper airflow to the
outdoor coil. For installations where units are installed
with both control panels facing each other (inward),
maintain a minimum of 36" clearance to allow access.
Additional clearance may be required to meet local or
national codes.

Care should be taken to ensure that the recirculation
and obstruction of condenser discharge air does not
occur. Recirculation of condenser discharge air can
be from either a single unit or multiple units. Any
object such as shrubbery, a building or a large object
can cause obstructions to the condenser discharge air.
Recirculation or reduced airflow caused by obstructions
will result in reduced capacity, possible unit pressure
safety lockouts and reduced unit service life.

For units with blow through condensers, such as the
D-Series units, it is recommended there be a minimum
distance of 10' between the front of the unit and
any barrier or 20' between the fronts of two opposing
(facing) units.

CLEARANCE TO COMBUSTIBLES

!

WARNING

Fire hazard.

Maintain minimum 1/4” clearance between the
supply air duct and combustible materials in

the rst 3’ feet of ducting.

Failure to do so could result in re causing
damage, injury or death.

The unit itself is suitable for 0" clearance, but the
supply air duct flange and the first 3' of supply air duct
require a minimum of 1/4" clearance to combustible
material. However, it is generally recommended that
a 1" clearance is used for ease of installation and
maintaining the required clearance to combustible
material. See Figure 1.3 on page 12 for details on
opening sizes.

Minimum Clearances Required to
Combustible Materials

MODELS

All covered by this
manual

SUPPLY AIR DUCT

FIRST 3'

1/4" 0"

CABINET

MODEL IDENTIFICATION

Identify the specific model using the model
nomenclature information found in Figure 1.1 and/
or model/serial tag found on the unit on the opposite
side of the control and access panels. See Figure 1.2
on page 10 for dimensions and critical installation
requirements.

Clearances Required for Service Access
and Adequate Condenser Airflow

MODELS LEFT SIDE RIGHT SIDE

All covered by this manual 26" 26"

Units with control panels
facing each other (inward)

36" between units

Manual 2100-620A
Page 9 of 107

FIGURE 1.2

DRAIN

ENTRANCE

4° PITCH

RAIN HOOD

BUILT IN

PANEL

ACCESS

HEATER

(LOCKABLE)

VENT HOOD

ACCESS PANEL

DISCONNECT

ENTRANCE

ELECTRICAL

LOW VOLTAGE

C. BREAKER/

HIGH VOLTAGE
ELECTRICAL

SIDE VIEW

JDK

H

7"

C

2.13

I

ELECTRIC HEAT

Top Rain
Flashing
Shipping
Location

DOOR

AIR

VENTILIATION

VENT HOOD

Cond.

Air

Inlet

FRONT VIEW

F

G

W

SUPPLY AIR

OPENING

OPENING

RETURN AIR

Brackets
(Built In)

Mounting

Optional
Electrical
Entrances

Side Wall

BOTTOM
INSTALLATION
BRACKET

BACK VIEW

S

E

T

O

S

S

S

S

R

Air Outlet

Condenser

Dimensions of Basic Unit for Architectural and Installation Requirements (Nominal)

Width

Depth

Model

D36A/L
D42A/L

D48A/L
D60A/L

(W)

42.075 22.432 84.875 9.88 29.88 15.88 29.88 43.88 13.56 31.66 30.00 32.68 26.94 34.69 32.43 3.37 43.00 23.88 10.00 1.44 16.00 1.88

42.075 22.432 93.000 9.88 29.88 15.88 29.88 43.88 13.56 37.00 30.00 40.81 35.06 42.81 40.56 3.37 43.00 31.00 10.00 1.44 16.00 10.00

Height

(D)

Supply Return

(H)

A B C B E F G I J K L M N O P Q R S T

All dimensions are in inches. Dimensional drawings are not to scale.

D**A

RIGHT

HAND

UNIT

D**L

F

G

FRONT VIEW

W

Condenser

Air Outlet

W

HEATER
ACCESS
PANEL

ELECTRIC HEAT

C. BREAKER/
DISCONNECT
ACCESS PANEL
(LOCKABLE)

VENT HOOD
DOOR

VENTILIATION
AIR

VENT HOOD

LOW VOLTAGE
ELECTRICAL
ENTRANCE

HIGH VOLTAGE
ELECTRICAL
ENTRANCE

2.13
A

7"

BUILT IN
RAIN HOOD
4° PITCH

LEFT

HAND

UNIT

VENT HOOD
DOOR

VENTILIATION

F

G

Condenser

Air Outlet

AIR

I

H

C

J

K

D

Cond.

Air

Inlet

Cond.

Air

Inlet

SIDE VIEW

BUILT IN
RAIN HOOD
4° PITCH

2.13

I

C

JDK

DRAIN

HEATER
ACCESS
PANEL

ELECTRIC HEAT

C. BREAKER/
DISCONNECT
ACCESS PANEL
(LOCKABLE)

7"

VENT HOOD

LOW VOLTAGE
ELECTRICAL
ENTRANCE

HIGH VOLTAGE
ELECTRICAL
ENTRANCE

H

Side Wall
Mounting
Brackets
(Built In)

Optional
Electrical
Entrances

Top Rain
Flashing
Shipping
Location

Side Wall
Mounting
Brackets
(Built In)

Top Rain
Flashing
Shipping
Location

Optional
Electrical
Entrances

SUPPLY AIR

OPENING

RETURN AIR

OPENING

BACK VIEW

SUPPLY AIR

OPENING

RETURN AIR

OPENING

E
O

E
O

R

S

S

S

S

S

BOTTOM
INSTALLATION
BRACKET

S

S

S

S

S

T

R

BACK VIEW

Manual 2100-620A
Page 10 of 107

SIDE VIEW

BACK VIEW

BOTTOM
INSTALLATION
BRACKET

MIS-3618

T

WALL-MOUNT UNIT INSTALLATION

MOUNTING THE UNITS

!

WARNING

Heavy item hazard.

Use more than one person to handle unit.

Failure to do so could result in unit damage or
serious injury.

NOTE: It may be best to spot some electrical knockouts
(such as those located on the back of the wall­mount unit) before units are mounted and access is
unavailable or limited (see Figure 1.2 to locate pre­punched knockouts).

Two holes for the supply and return air openings must
be cut through the wall as shown in Figure 1.3 on page

12. On wood frame walls, the wall construction must
be strong and rigid enough to carry the weight of the
unit without transmitting any unit vibration. Concrete
block walls must be thoroughly inspected to insure that
they are capable of carrying the weight of the installed
unit.

NOTICE

AT&T National Standards forbids the use of
any adaptor or transitional curbs for use in
the installation of wall-mount HVAC systems.

If existing supply and return penetrations
do not match new requirements, those
openings must be modied to meet the

needs of the new equipment.

2. The unit itself is suitable for 0" clearance, but the
supply air duct flange and the first 3' of supply
air duct require a minimum of 1/4" clearance to
combustible material. However, it is generally
recommended that a 1" clearance is used for
ease of installation and maintaining the required
clearance to combustible material. See Figure 1.3
for details on opening sizes.

3. Locate and mark lag bolt locations and location for
optional bottom mounting bracket, if desired (see
Figure 1.3).

4. Mount bottom mounting bracket (if used).

5. If desired, hook top rain flashing (attached to front­right of supply flange for shipping) under back
bend of top.

6. Position unit in opening and secure with 5/16" lag/
anchor/carriage bolts; use 7/8" diameter flat washers
on the lag bolts. It is recommended that a bead
of silicone caulking be placed behind the side
mounting flanges.

7. Secure optional rain flashing to wall and caulk
across entire length of top (see Figure 1.3).

8. For additional mounting rigidity, the return air
and supply air frames or collars can be drilled
and screwed or welded to the structural wall itself
(depending upon wall construction). Be sure to
observe required clearance if combustible wall.

9. A plastic drain hose extends from the drain pan at
the top of the unit down to the unit base. There are
openings in the unit base for the drain hose to pass
through. In the event the drain hose is connected
to a drain system of some type, it must be an open
or vented type system to assure proper drainage.

In retrofit (unit replacement) installations, the openings
cut for the original equipment may not line up exactly
with needs of this installation. Modifications may need
to be made, such as increasing or decreasing the size
of the wall cutouts. The existing bolt placement may
not line up in which case the original bolts would need
to be removed or cut away.

1. These units are secured by wall mounting flanges
which secure the unit to the outside wall surface at
both sides. A bottom mounting bracket, attached
to skid for shipping, is provided for ease of
installation, but is not required.

Manual 2100-620A
Page 11 of 107

SUPPLIED

RAIN FLASHING

FOAM AIR SEAL

WALL STRUCTURE

1/4" CLEARANCE ON ALL

FOUR SIDES OF SUPPLY

AIR DUCT IS REQUIRED

MATERIALS

FROM COMBUSTABLE

PANEL

DUCT

SUPPLY AIR

RETURN AIR

OPENING

NOTES:

IT IS RECOMMENDED THAT A BEAD OF

SILICONE CAULKING BE PLACED BEHIND

THE SIDE MOUNTING FLANGES AND UNDER

MIS-3354

TOP FLASHING AT TIME OF INSTALLATION.

Right Side View

TOP.

FIGURE 1.3

SEAL WITH BEAD

OF CAULKING ALONG

ENTIRE LENGTH OF

Mounting Instructions

A B C D E

HEATER ACCESS

WALL

TOP

29

2

B

E

16"

6 1/4 1 1/4 29 3/4

10 1/2

30 1/2

32 12 5 1/2

A CC

Supply Opening

Return Opening

30"

"

1

2

6

"

7

8

"

1

8

3

4"

3"

3

"

1

8

2

"

1

2

Typ.

1"

4"

Typ.

" 6

1

2

6

Wall Opening and Hole Location View

1

D

16"

16"

16"

16"

1

16"

"

7

8

1

2

COMBUSTIBLE MATERIALS

1/4" MIN. CLEARANCE FROM

REQUIRED DIMENSIONS TO MAINTAIN

REQUIRED DIMENSIONS TO MAINTAIN

RECOMMENDED 1" CLEARANCE FROM

COMBUSTIBLE MATERIALS

Manual 2100-620A
Page 12 of 107

FIGURE 1.4

DUCT

OPENING

RETURN AIR

SUPPLY AIR

WOOD FRAME WALL INSTALLATION

OPENING

WALL BEFORE

MOUNT ON UNIT

OPENING

BEFORE INSTALLATION

BOTTOM MOUNTING

CONCRETE BLOCK WALL INSTALLATION

BRACKET. MOUNT ON

OPENING

WOOD OR STEEL SIDING

OPENING

INSTALLING UNIT.

RETURN AIR

WALL STRUCTURE

RETURN AIR

SUPPLY AIR

FACTORY SUPPLIED

RAIN FLASHING.

SUPPLY AIR

MIS-548 A

SIDE VIEW

Electric Heat Clearance

Wall Mounting Instructions

See FIGURE 2 – Mounting Instructions

FIGURE 1.5

Manual 2100-620A
Page 13 of 107

FIGURE 1.6

I

A

C

K

E + 1.000

B

1.000

SUPPLY DUCT

OVER FRAME

INTERIOR FINISHED WALL

ALL AROUND DUCT

FRAMING MATERIAL

EXTERIOR FINISH WALL

OPENING

FOR ACTUAL DIMENSIONS.

2 x 4'S, 2 x 6'S &/OR

STRUCTURAL STEEL

ATTACH TO TOP

1.000" CLEARANCE

1.000" CLEARANCE

PLATE OF WALL

C

SEE UNIT DIMENSIONS, FIGURE 2,

OPENING

RETURN DUCT

2 x 6

ATTACH TO BOTTOM

OVER FRAME

PLATE OF WALL

L

THIS STRUCTURAL MEMBER
LOCATED TO MATCH STUD
SPACING FOR REST OF WALL.
A SECOND MEMBER MAY BE
REQUIRED FOR SOME WALLS.

MIS-549 B

ALL AROUND DUCT

SUPPLY DUCT MAY BE LOCATED IN AN ATTIC

OPENING W/ GRILLE

SUPPLY AIR DUCT

RAFTERS

RAFTERS

RETURN AIR
OPENING W/ GRILLE

DUCTED SUPPLY

OR BELOW CEILING RAFTERS AS SHOWN

FINISHED CEILING SURFACE

RAIN

FLASHING

RAIN

FLASHING

RETURN AT UNITNO DUCT

RETURN AIR

FINISHED CEILING SURFACE

FREE AIR FLOW

OUTSIDE

WALL

OUTSIDE

WALL

SUPPLY AIR DUCT
W/ GRILLE

Wall Mounting Instructions

FIGURE 1.7

Common Wall Mounting Installations

Manual 2100-620A
Page 14 of 107

WALL-MOUNT UNIT SUPPLY WIRING

All models covered by this installation
instruction require dual power sources:
VAC utility power to run the compressor, heat
and outdoor fan motor and -48 VDC power
to operate the indoor blower and DC free
cooling damper.

!

WARNING

Electrical shock hazard.

Have a properly trained individual perform
these tasks.

Failure to do so could result in electric shock
or death.

These units require a positive ground

-48 VDC copper conductor field wire
connection. Refer to the unit wiring diagram

for more information.

Refer to the unit rating plate or Table 1.1 for wire
sizing information and maximum fuse or circuit breaker
size. Each outdoor unit is marked with a “Minimum
Circuit Ampacity”. The field wiring used must be sized
to carry that amount of current. All models are suitable
only for connection with copper wire. Each unit and/or
wiring diagram will be marked “Use Copper Conductors
Only”. These instructions must be adhered to. Refer
to the National Electrical Code (NEC) for complete
current carrying capacity data on the various insulation
grades of wiring material. All wiring must conform to
NEC and all local codes.

TABLE 1.1

Electrical Specifications

AC POWER CIRCUIT DC POSITIVE GROUND POWER CIRCUIT

Model

D36A2PA05/D36L2PA05
D36A2PA10/D36L2PA10

D36A2PB06/D36L2PB06
D36A2PB09/D36L2PB09

D42A2PA05/D42L2PA05
D42A2PA10/D42L2PA10

D42A2PB06/D42L2PB06
D42A2PB09/D42L2PB09

D48A2PA05/D48L2PA05
D48A2PA10/D48L2PA10

D48A2PB06/D48L2PB06
D48A2PB09/D48L2PB09

D60A2PA05/D60L2PA05
D60A2PA10/D60L2PA10

D60A2PB06/D60L2PB06
D60A2PB09/D60L2PB09

These “Minimum Circuit Ampacity” values are to be used for sizing the field power conductors. Refer to the National Electric Code (latest
version), Article 310 for power conductor sizing.

CAUTION: When more than one field power circuit is run through one conduit, the conductors must be derated. Pay special attention to

note 8 of Table 310 regarding Ampacity Adjustment Factors when more than three (3) current carrying conductors are in a
raceway.

Maximum size of the time delay fuse or circuit breaker for protection of field wiring conductors.
Based on 75°C copper wire. All wiring must conform to the National Electric Code and all local codes.

Rated Volts,

Hertz & Phase

208/230-60-1

208/230-60-3

208/230-60-1

208/230-60-3

208/230-60-1

208/230-60-3

208/230-60-1

208/230-60-3

Minimum

Circuit

Ampacity

26
52

18

27.1

26
52

18.6

27.1

29
52

18.8

27.1

34.4
52

27.5

27.5

Maximum

External Fuse or

Ckt. Breaker

45
60

25
30

40
60

30
30

50
60

30
30

60
60

35
35

Field Power/
Ground Wire

Size

8
6

10
10

8
6

10
10

8
8

10
10

6
6

8
8

Minimum

Circuit

Ampacity

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

17.5

Maximum

External Fuse or

Ckt. Breaker

20
20

20
20

20
20

20
20

20
20

20
20

20
20

20
20

Field Power/
Ground Wire

Size

12
12

12
12

12
12

12
12

12
12

12
12

12
12

12
12

Manual 2100-620A
Page 15 of 107

The electrical data lists fuse and wire sizes (75°C

NOTICE / AVIS

ROUTE ALL HIGH VOLTAGE FIELD

WIRES TO THE RIGHT OF THE WIRE

SHIELD AS SHOWN

ACHEMINER LES FILS HAUTE

TENSION SUR LA DROITE VERS LA

PROTECTION, COMME INDIQUÉ

VAC CIRCUIT BREAKER

/DISJONCTEUR

WIRE SHIELD /

PROTECTION

WHITE 3/16" LETTERING

7961-807

VDC CIRCUIT BREAKER

/DISJONCTEUR

copper) for all models including the most commonly
used heater sizes. Also shown are the number of field
power circuits required for the various models with
heaters.

The unit rating plate lists a “Maximum Time Delay
Relay Fuse” or circuit breaker that is to be used with
the equipment. The correct size must be used for
proper circuit protection and also to assure that there
will be no nuisance tripping due to the momentary high
starting current of the compressor motor.

Route all field wires to the right of the wire shield as
shown in the circuit routing label found in Figure 1.8
(and also on the wall-mount units).

Factory

Wiring

FIGURE 1.9

VAC Supply Wiring Landing Points

Field
Wiring

.

See Figure 1.9 to reference VAC landing points and
Figure 1.11 to reference VDC landing points.

The disconnect access door on this unit may be locked
to prevent unauthorized access to the disconnect. To
convert for the locking capability, bend the tab located
in the bottom left-hand corner of the disconnect
opening under the disconnect access panel straight
out. This tab will now line up with the slot in the door.
When shut, a padlock may be placed through the hole
in the tab preventing entry.

FIGURE 1.8

Circuit Routing Label

NOTE: Right-hand access model wiring landing points

are shown here; left-hand access models will
mirror this image.

IMPORTANT

230/208V 1 phase and 3 phase equipment use
dual primary voltage transformers. All equipment
leaves the factory wired on 240V tap. It is very
important that the correct voltage tap is used. For
208V operation, reconnect from 240V to 208V
tap (see Figure 1.10). The acceptable operating
voltage range for the 240 and 208V taps are:
240V Tap (253 – 216) and 208 Tap (220 – 197).

Manual 2100-620A
Page 16 of 107

FIGURE 1.10

Adjusting the 230/208 VAC Transformer

It is very important that the correct voltage tap (240V or 208V) is used

1. Verify incoming AC voltage: Multimeter set to VAC

.

Shelter supply breaker in ON position Bard

system breaker in OFF position

230V/208V Single Phase Voltage Range:

197VAC – 253VAC

230V/208V Three Phase Voltage Range:

197VAC – 253VAC

(not shown)

2. If incoming AC voltage is 220VAC or above...

...do not adjust transformer

230VAC

+

3. If incoming AC voltage is below 220VAC...

...shut off AC breaker to unit

and move factory "240V" wire to "208V" terminal

FIGURE 1.11

VDC Supply Wiring Landing Points

.

-

Factory

Wiring

NOTE: Right-hand access model wiring landing points are

shown here; left-hand access models will mirror of
this image.

+

.

Field Wiring

+

Manual 2100-620A
Page 17 of 107

FIGURE 1.12

Bard Polarity-Voltage Monitor

If the VDC wiring is not terminated correctly on the specific polarity-indicated
terminals of the VDC terminal block, the VDC controls and motors will not activate
and the wall-mounted unit will not function.

The Bard Polarity-Voltage Monitor continually monitors for correct polarity and
voltage. If field wiring is connected improperly, or the voltage is outside of the
system parameters, the Polarity-Voltage Monitor will not allow any VDC voltage to
enter the system, protecting the internal controls and equipment.

+

When field wiring is correct in voltage and polarity, the
green power (PWR) LED and yellow polarity (POL) LED
will light, and system will operate normally.

If field wiring is incorrect in polarity, the red FAULT
LED will light, and the monitor will not allow VDC
voltage into the system.

If field wiring is correct in polarity but outside of the
required 40VDC – 56VDC, the green PWR LED will not
illuminate and the monitor not allow VDC voltage into
the system.

If the Polarity-Voltage Monitor is showing a problem with polarity and/or voltage, see pages 67 and 68 of the Service
section of this manual for instructions on checking VDC polarity and verifying incoming VDC voltage.

Manual 2100-620A
Page 18 of 107

PRELIMINARY START-UP

RUNNING IN STAND ALONE (ORPHAN) MODE

With both AC and DC breakers turned on, each D-Series wall-mount system has the capability to run without the PLC
controller attached—this feature is called Stand Alone or Orphan Mode, and it basically keeps the shelter between
60°F and 78°F by the use of the factory-installed return air sensor in each wall-mount unit.

During installation, this allows deactivation of one of the two existing, older wall-mount units, while keeping the
shelter cool with the other unit still operating. Once the first of the two Bard wall-mount units is installed, Orphan
Mode can be enabled early in the installation—keeping the climate inside the shelter stable and the installers
comfortable while the remainder of the older equipment is removed and the second Bard wall-mount unit and PLC
controller is installed.

Additionally, should either or both D-Series wall-mount units lose communication with the PLC controller (such as
during maintenance), they will continue to serve the shelter's needs until a repair can be made.

Manual 2100-620A
Page 19 of 107

BARD-LINKTM CONTROLLER INSTALLATION

FIGURE 1.13

Typical LC1000/LC1500 Wiring

RJ11 Cable

to Display

48VDC

Power Supply

24VDC

Power

to PLC

Ethernet Cable

PLC Board

Lag Unit

Running Relay

HVAC2 Fail

Alarm Relay

Smoke
Alarm Relay

Hydrogen
Alarm Relay

Generator
Alarm Relay

Web Card

High Temp
Alarm Relay

Low Temp
Alarm Relay

-48VDC

Power Input

24VDC

Hydrogen

Power

Smoke Power

Manual 2100-620A
Page 20 of 107

24VDC

Generator

Alarm Jumper

Remote Temp

Sensor

HVAC1 Fail
Alarm Relay

RS485
Communication
Cable

Alarm Block

Wiring

!

WARNING

Electrical shock hazard.

Disconnect both VAC and VDC power supplies

before servicing.

Failure to do so could result in electric shock
or death.

LC1000-100/LC1500-100 CONTROLLER

The Bard-LinkTM LC1000-100 (or LC1500-100)
controller is part of the DC Free Cooling Unit system. It
is used to control two wall-mount air conditioners from
one controller. The microprocessor control provides an
easy-to-read interface with large LCD graphical display.
It provides total redundancy for the structure and
equal wear on both units. The Bard-LinkTM controller is
configured for lead/lag/lead/lag sequence.

Differences Between the LC1000-100 and LC1500-100

There are two separate PLC lead-lag controllers to
choose from and each one serves a specific application.
The LC1000-100 controller comes pre-packaged with
a TEC-EYE hand-held diagnostic tool, one remote
temperature sensor and a pair of communication
EMI filters. This controller is meant for new shelter
construction only, and should never be used in the field
as a retrofit replacement. The LC1500-100 controller
comes pre-packaged with the TEC-EYE hand-held
diagnostic tool, one remote temperature sensor, a pair
of communication EMI filters and a smoke detector.
(The optional 8301-061 hydrogen detector, if ordered
from Bard, is also included with the LC1500-100
controller). The LC1500-100 has an umbilical cord
and 66 punch-down block attached. The LC1500
controller is to be used in all retrofit applications, and
all existing smoke detectors (and hydrogen detectors,
if applicable) are to be removed in lieu of the new
detectors.

Conduit is recommended for all wiring. Use separate
conduits for communication and supply wiring.

1. Mounting the Controller

TM

Because the Bard-Link
temperature sensor as opposed to one located in the
controller box, the controller itself can be installed in
any indoor location that is suitable, preferably at eye
level. Four (4) mounting holes are provided for mounting
to the wall and holes for conduit connections are provided
in both the base, sides and top of the controller. If
installing the LC1500-100, be sure to leave room to
mount the 66 punch-down block (attached with an
umbilical cord) near the controller.

controller utilizes a remote

Manual 2100-620A
Page 21 of 107

2. Installing Remote Indoor Temperature Sensor(s)

A single remote indoor temperature sensor is included with the controller. This sensor must be installed for proper
operation. Use the included 35' shielded cable to mount the temperature sensor in a location least likely to be
affected by open doors, rack-mounted fans, radiant heat sources, etc. Locating the sensor between both return grilles
is often the best location, but every installation is unique. Location height should be approximately 48" above the
floor. The sensor should be installed on a 4" by 4" junction box to allow for control wire conduit (see Figure 1.14).

For proper operation, the remote indoor temperature sensors must be configured properly with the controller. If only
the single remote indoor temperature sensor supplied with the controller is installed, the configuration setting is

FIGURE 1.14

Remote Indoor Temperature Sensor Installation

1. Connect wires from provided 35' shielded cable to terminals
#11 and #12. The connection is not polarity-sensitive.

2. Connect the other end of the 35' shielded cable to either of
the sensor terminals. These connections are also not polarity
sensitive.

Sensor is best mounted on a junction box, and it is

recommended that the cable be in conduit.

Manual 2100-620A
Page 22 of 107

"0". This is the default setting. For information on checking the remote indoor temperature sensor configuration, see
Configuring Additional Remote Indoor Temperature Sensors on page 51.

For unique situations involving temperature flux within the shelter, up to two (2) additional sensors may be
purchased and installed to provide temperature-averaging or highest-temperature protection (see Figure 1.15).
Please see Configuring Additional Remote Indoor Temperature Sensors on page 51 in the Service section of this
manual to set up the additional remotes.

FIGURE 1.15

Additional Remote Temperature Sensor Installation

Up to two (2) additional sensors may be purchased and installed for averaging or highest-temp mode. Use
terminals #13, #14, #15 and #16. These connections are not polarity-sensitive.

Remote Sensor

Optional Additional
Remote Sensor

Optional Additional
Remote Sensor

Manual 2100-620A
Page 23 of 107

3. Smoke, Hydrogen and Generator Alarms

The LC1500 PLC controller is shipped with a new smoke detector (and optional hydrogen detector if ordered from
Bard) for use in existing shelters. The existing smoke detector (and hydrogen detector, if applicable) should be
removed and disposed of properly. In cases where there are no existing detectors, follow the installation instructions
provided with each detector for location and mounting practices. Both controllers have the capacity to provide power
to a 24VDC smoke detector and a 24VDC hydrogen detector through fused power supply terminals. For proper power
and alarm wiring, review the provided wiring diagrams (see Figures 1.16 and 1.17).

Please note that the provided smoke detector (and hydrogen detector, if applicable) has external testing buttons to
artificially (and temporarily) create an alarm sequence. Additionally, should the desired NC contact closure need to
be changed to the alternative contact closure, please refer to the Service section of this manual to reprogram the
PLC control.

The generator run alarm (if desired) will be signaled through an existing (or field provided) relay attached to the site
generator. The signal from the controller will route through a set of normally closed contacts. Should the generator
start, the contacts will open, triggering the alarm and initiating “Generator Run Mode” (both compressors cannot
operate concurrently). Since some sites do not have a generator present, there is a factory-installed jumper across
terminals #9 and #10. If there is no generator, no action is necessary. If generator run alarm is desired, please
remove the factory-installed jumper and wire per Figure 1.18.

FIGURE 1.16

Power and Signal Connections for Smoke Detector

-24VDC

+24VDC

See Terminal Block Index
on page 33

-24VDC Return Signal

1. Using minimum 18 gauge, non-shielded wire, supply the
new smoke detector with 24VDC from terminals 6 and 7
of the PLC controller.

2. Route a jumper wire from the -24VDC terminal on the
new smoke detector to the common terminal of the on­board relay.

3. From the normally closed contact of the relay, return the

-24VDC signal to terminal #8 of the PLC controller.

Manual 2100-620A
Page 24 of 107

NC

COM

FIGURE 1.17

Power and Signal Connections for Bard-Supplied Hydrogen Detector (If Applicable)

See Terminal Block Index
on page 33

-24VDC
Return

Signal

-24VDC

+24VDC

1. Using minimum 18 gauge, non-shielded wire, supply the
new hydrogen detector with 24VDC from terminals 3 and 4
of the PLC controller.

2. Route a jumper wire from the -24VDC terminal on the new
hydrogen detector to the common terminal of the on-board
2% relay.

-24VDC

+24VDC

3. From the normally closed contact of the relay, return the

-24VDC signal to terminal #5 of the PLC controller.

FIGURE 1.18

LC1000-100 and LC1500-100 Series Generator Run

-24VDC Return Signal

-24VDC

1. If there is a generator on site, remove the factory­installed jumper on Terminals #9 and #10. Using
minimum 18 gauge, non-shielded wire, supply the
common terminal on the existing generator relay with

-24VDC from terminal #9 on the PLC controller.

2. From the normally closed contact of the relay, return
the -24VDC signal to terminal #10 of the PLC
controller.

Manual 2100-620A
Page 25 of 107

4. Connecting External Alarm Points

Both the LC1000 and LC1500 PLC controls have the capability to provide NC contacts for the following eight (8)
alarms:

• Smoke

• Hydrogen

• Generator

• Lag Unit Run

• High Temp*

• Low Temp*

• HVAC 1 Fail

• HVAC 2 Fail

Before connecting the external alarm wiring, identify the model of the controller (see label inside of controller door).
The LC1000 provides contacts for alarms at the internal terminal block (see Figure 1.19).

The LC1500 PLC control has a pre-installed, pre-wired 66 punch-down block to allow easy connection to these
contacts outside of the controller box (see Figure 1.20).

FIGURE 1.19

LC1000-100 External Alarm Wiring

On the terminal strip of the LC1000 controller, there are eight (8) separate series of normally closed dry contacts for the
following alarm scenarios…

• Smoke

• Hydrogen

• Generator

• Lag Unit Run

• High Temp*

• Low Temp*

• HVAC 1 Fail

• HVAC 2 Fail

* There is no longer any need for the

electro-mechanical coiled-bulb type
thermostats—like the Johnson Penn
A19-Series—for High/Low Temperature
Alarms. Do not install in new sites, and
remove them in retrofit applications.

Lag Unit Run Alarm Common

Lag Unit Run Alarm Contact

Generator Alarm Common

Generator Alarm Contact

Hydrogen Alarm Common

Hydrogen Alarm Contact

Smoke Alarm Common

Smoke Alarm Contact

High Temp Alarm Contact

High Temp Alarm Common

Low Temp Alarm Contact

Low Temp Alarm Common

HVAC 1 Fail Alarm Contact

HVAC 1 Fail Alarm Common

HVAC 2 Fail Alarm Contact

HVAC 2 Fail Alarm Common

Manual 2100-620A
Page 26 of 107

FIGURE 1.20

LC1500-100 External Alarm Wiring

Before connecting the external alarm wiring, identify the model of the controller (see label on inside of controller door. The
connections described below are for the LC1500-100 controller only.

The LC1500-100 has the same eight (8) separate series of normally closed dry contacts as the LC1000-100, but has a
prewired 66 punch-down block to make external connections easier.

• Smoke

• Hydrogen

• Generator

• Lag Unit Run

• High Temp*

• Low Temp*

• HVAC 1 Fail

• HVAC 2 Fail

Field wiring for alarms

48” umbilical cord allows for mounting the 66 punch-down
block to either side, top or bottom of PLC controller cox.

Bridge clips have been inserted for convenience.

* There is no longer any need for the electro-mechanical coiled-bulb type thermostats—like the Johnson Penn A19-

Series—for High/Low Temperature Alarms. Do not install in new sites, and remove them in retrofit applications.

Manual 2100-620A
Page 27 of 107

5. Communication Wiring

Connect the communication wiring from the two wall-mount units to the controller in the manner shown in Figure

1.21. The communication wire should be 2-wire, 18 gauge shielded cable with drain. Any color can be used. Be
sure to match "+" and "-" symbols on controller terminal blocks to prewired unit control terminal block (see Figures

1.23 and 1.24 on pages 30 and 31). Attach communication wire filters as shown below in Figure 1.22. Use separate

conduits for communication and supply wiring.

FIGURE 1.21

Communication Wiring

D-Series

Wall-Mount Unit

D-Series

Wall-Mount Unit

Bard-LinkTM

Controller

Manual 2100-620A
Page 28 of 107

FIGURE 1.22

- +

G

Communication Wiring: Termination at the Controller

1. Using the field-provided shielded cable, make a small service loop after entering the controller and attach the provided
EMI filter at the intersection of the loop.

2. Connect one wire to terminal #33 (negative), the other wire to terminal #34 (positive) and the drain wire to ground
terminal #35.

To Wall-Mount Unit 1
Control Board RS485

Manual 2100-620A
Page 29 of 107

RS485

R+T+ / R-T-

FIGURE 1.23

RS485

R+T+ / R-T-

Communication Wiring: Termination at the First Wall-Mount Unit

RS485

R+T+ / R-T-

Wall-Mount Unit 1

Control Board

1. From the controller, extend the shielded cable through a separate conduit
and route to the provided terminal block next to the wall-mount control
board.

Note that the terminal block label is clearly marked “+” and “-”. These

connections are polarity-sensitive. Two-wire communication from control
board is prewired to terminal block. Make sure to match "+" and "-"
symbols on controller terminal blocks.

From LC1000-100
or LC1500-100
Controller

2. Connect the wires matching the terminal
designations (+/-) of the controller terminals.
Leave the drain wire loose.

Wall-Mount Unit 1

Control Board

From LC1000-100
or LC1500-100
Controller

Wall-Mount Unit 1

Control Board

Manual 2100-620A
Page 30 of 107

3. Connect another cable in a similar
fashion (“daisy chain”) to route in
conduit to the second wall-mount unit.
Connect both drain wires with wire nut.

From LC1000-100
or LC1500-100
Controller

To Wall-Mount Unit 2
Control Board RS485