Bard MEGA-TEC W120AP Service Instructions Manual

SERVICE INSTRUCTIONS

TM

MEGA-TEC

WALL-MOUNT AIR CONDITIONER

Model W120AP

NOTE: LC6000 controller is required for operation when W120AP

units are used.

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com

Manual: 2100-671
Supersedes: NEW
Date: 12-17-18

Page 1 of 44

CONTENTS

General Information ...........................................4

Multi-Stage Cooling System ...................................4

Wall-Mount Air Conditioner Units ............................4

General ..............................................................4

Shipping Damage ..................................................4

Additional Publications ..........................................4

Using the TEC-EYETM ...........................................6

TEC-EYE Hand-Held Diagnostic Tool .......................6

TEC-EYE Menu Structure ................................7

TEC-EYE

Main Status Screen ........................................7

Quick Menu ...................................................8

Setpoints ................................................8

Information .............................................8

A/C Circuit Information ......................8

Program Version ................................9

Alarm Log ...............................................9

Menu Screens and Password Levels ..................9

Executing a Run Test ....................................10

Run Test Parameter Descriptions .............10

Reset to Factory Defaults ..............................10

Acronyms .........................................7

Operation ............................................................11

Unit On/Off ........................................................11

Alarm Adjustment ...............................................11

Acknowledging Alarms ..................................11

Clearing Alarms ............................................11

Clearing Alarm Logs and Counters ..................11

Exporting Alarm Logs ....................................11

Exporting 7 Day Logs ....................................12

Exporting Parameters ....................................12

Zone ..................................................................12

Temperature Control ............................................ 12

Temperature Control Components ................... 12

Return Air Temperature Sensor ................ 12

Return Air Temperature Alarm........... 12

Temperature Control Operation ....................... 12

Orphan Mode .........................................13

LC6000 Control .....................................13

Cooling (with Economizer).......................13

Cooling (without Economizer) ..................13

Heating .................................................13

Electronic Expansion Valve (EEV) ..........................14

EEV Components ..........................................14

Electronic Expansion Valve ......................14

EEV Instructions for Vacuum,

Reclaim, Charge Unit .......................14

System Pressures ............................15

Suction Pressure Transducer ................... 15

Troubleshooting the Suction

Pressure Transducer ......................... 15

Suction Pressure Alarm ....................16

Suction Temperature Sensor .................... 16

Suction Temperature Alarm .............. 16

EEV Operation ..............................................17

EEV Superheat Control ...........................17

Additional EEV Alarms ..................................17

Low Superheat Alarm .............................17

Evaporator Freeze Condition Alarm ......

16

Indoor Airflow .....................................................17

Indoor Airflow Components ............................17

Blower ..................................................17

Blower Status Switch .............................18

Blower Status Alarm ........................18

Filters ...................................................18

Dirty Filter Switch ..................................18

Dirty Filter Alarm .............................18

Filter Indicator Light ..............................19

Indoor Airflow Operation ................................19

Blower Speed Control .............................19

Additional Indoor Airflow Alarms ....................19

Supply Air Temperature Alarm ................. 19

Condenser Fan ....................................................19

Condenser Fan Components...........................19

Condenser Fan .......................................19

Liquid Pressure Sensor ...........................20

Troubleshooting the Discharge/

Liquid Pressure Transducer .............. 20

Discharge/Liquid Pressure

Transducer Alarm ............................ 21

Liquid Temperature Sensor ..................... 21

Outdoor Temperature Sensor ................... 21

Condenser Fan Operation ..............................21

Condenser Fan Speed Control..................21

Compressor ........................................................21

Compressor Components ...............................21

Compressor ...........................................21

Compressor Control Module (CCM) ...........22

Delay-on-Make Timer ....................... 22

Short Cycle Protection/

Delay-on-Break ................................22

High Pressure Detection ...................22

Test Mode ....................................... 23

High Pressure Safety Switch ...................23

Refrigerant High Pressure Alarm .......23

Phase Monitor .......................................23

Compressor Operation ...................................23

Additional Compressor Alarms .......................24

Refrigerant Low Pressure Alarm ...............24

Economizer ........................................................24

Economizer Components ...............................24

Actuator ................................................24

Dust Sensor ...........................................25

Dust Sensor Failure Alarm ................25

High Dust Limit Alarm .....................25

Damper Blade ........................................26

Damper Switch ......................................26

Damper Failed to Open Alarm ...........26

Damper Failed to Close Alarm ...........26

Outdoor Temperature and Humidity

Combination Sensor ...............................26

Outdoor Temperature Sensor

Failure Alarm ..................................27

Outdoor Humidity Sensor

Failure Alarm ..................................27

Brownout Protection w/Adjustment ......

23

Manual 2100-671
Page 2 of 44

Mixed Air Temperature Sensor ................. 27

High Mixed Air Temperature Alarm .... 27

Low Mixed Air Temperature Alarm ..... 28

Economizer Operation ...................................28

Economizer Operation −

Minimum Position ..................................29

Miscellaneous Components ..................................30

Supply Temperature Sensor ........................... 30

Emergency Cooling Mode .....................................30

Emergency Cooling − Orphan Mode ................30

Emergency Ventilation Mode ................................31

Electric Heat Option ............................................31

Electric Heat Components .............................31

Electric Heating Element ........................31

Thermal Overload ...................................31

Electric Heat Operation .................................31

Unit Disable Option .............................................31

Serial/Model Number Configuration .......................31

Supply Temperature Sensor Failure Alarm .........

30

Refrigerant Information ..................................34

General ..............................................................34

Topping Off System Charge .................................. 34

Safety Practices ..................................................34

Important Installer Note .......................................34

R410-A Refrigerant Charge ..................................34

Pressure Service Ports .........................................35

Maintenance .......................................................36

Standard Maintenance Procedures ........................36

Troubleshooting ................................................37

8301-089 Outdoor Temperature Temperature/

Humidity Sensor ...............................................37

8620-296 Supply Air Sensor/Return Air Sensor/

Mixed Air Sensor/Suction Sensor/Liquid Sensor ......40

8301-057 Blower Status Switch/Dirty Filter

Switch ...............................................................41

Alarm Index ........................................................42

Blower Speeds ....................................................44

FIGURES AND TABLES

Figure 1 TEC-EYE Display and Interface ................6

Figure 2 TEC-EYE Connection to Unit Control ........6

Figure 3 Quick Menu Icons ...................................7

Figure 4 Cool and Heat Setpoints .......................... 8

Figure 5 A/C Circuit Measurements .......................8

Figure 6 Program Version .....................................9

Figure 7 Executing Run Test ...............................10

Figure 8 Restoring Factory Default Settings..........10

Figure 9 Clearing All Alarms ............................... 11

Figure 10 Clearing Alarm Logs and Counters .......... 11

Figure 11 Changing Zone .....................................12

Figure 12 Adjusting Return Air Temperature

Sensor .................................................12

Figure 13 Cooling (with Economizer) .....................13

Figure 14 Cooling (without Economizer).................14

Figure 15 Heating ...............................................14

Figure 16 Overriding EEV Output ..........................14

Figure 17 Electronic Expansion Valve (EEV) and

Service Tool ......................................... 15

Figure 18 Adjusting Suction Sensor/Transducer

Pressure Values ....................................15

Figure 19 Voltage to Pressure: Suction Pressure

Transducer ........................................... 16

Figure 20 Adjusting Suction Temperature Sensor

Values .................................................16

Figure 21 Adjusting Evaporator Freeze Sensor

Values .................................................17

Figure 22 Putting Blower Output into Override

Mode ...................................................17

Figure 23 Dirty Filter Switch and Blower Status

Switch .................................................18

Figure 24 Verifying Differential Airflow Status ........18

Figure 25 Dirty Filter Switch and Filter Indicator

Light ...................................................19

Figure 26 Enabling Fan Override ........................... 20

Figure 27 Adjusting Discharge/Liquid Transducer

Pressure Values ....................................20

Figure 28 Voltage to Pressure: Discharge/Liquid

Pressure Transducer .............................. 20

Figure 29 Adjusting Discharge/Liquid

Temperature Input ................................ 21

Figure 30

Figure 31 Adjusting Compressor Delays .................24

Figure 32 Damper Override ..................................24

Figure 33 Dust Sensor .........................................25

Figure 34

Figure 35 Damper Blade Position .......................... 26

Figure 36 Damper Switch ..................................... 26

Figure 37 Outdoor Temperature Sensor ..................27

Figure 38 Outdoor Humidity Sensor ......................27

Figure 39 Mixed Air Temperature Sensor ...............27

Figure 40 Economizer Setup ................................29

Figure 41
Figure 42
Figure 43

Figure 44 Supply Air Temperature Sensor ..............30

Figure 45 Emergency Cool − Orphan Mode ............30

Figure 46 Adjusting Return Air Alarm Settings .......31

Figure 47 Unit Disable Option ..............................31

Figure 48 Serial/Model Number Configuration ........32

Figure 49 MEGA-TEC Wall-Mount Unit Model

Nomenclature ......................................33

Figure 50 8301-089 Sensor DIP Switches and

Terminal Block ..................................... 37

Figure 51 8301-057 Air Differential Switch

Terminals ............................................. 41

Table 1 Unit Status Message ...............................7

Table 2

Table 3 Rated Airflow .......................................17

Table 4 Indoor Blower Performance ....................17

Table 5 Maximum ESP of Operation:

Electric Heat Only ................................18

Table 6 Economizer Default Settings ..................29

Table 7 Cooling Pressures .................................35

Table 8 8301-089 Sensor: Temperature/

Resistance ...........................................38

Table 9 8301-089 Sensor: Humidity/mA ............39

Table 10 8620-296 Sensor: Temperature/

Resistance Curve J ...............................40

Table 11 MEGA-TEC Alarm Index ........................42

Table 12 Blower Speeds .....................................44

8201-164 Compressor Control Module

Adjusting Dust Sensor Alarm Setpoint

Economizer Setup – Dry Bulb Control ......

Economizer Setup –

Economizer Setup – Enthalpy Control ........

LC6000/TEC-EYE Passwords (Defaults) .......

TempHum

......22

.......25

Control ....

29
29
29

9

Manual 2100-671
Page 3 of 44

GENERAL INFORMATION

Multi-Stage Cooling System

This Bard cooling system is composed of MEGA-TEC
Series wall-mounted air conditioners matched with
an LC6000 lead/lag controller. The wall mounts are
specifically engineered for telecom/motor control center
rooms.

NOTE: The LC6000 lead/lag controller and MEGA-

TEC Series wall-mount units are designed
specifically to work together. The controller
cannot run other brands of systems, nor can
other controllers run the MEGA-TEC Series wall­mount units. They are a complete system, and
must be used together.

Wall-Mount Air Conditioner Units

The wall-mount units operate on VAC power.
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 optional auxiliary heat.

The units

General

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 without duct work. Flanges
are provided for transition from unit to wall grilles.

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 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 Additional Publications for information
on codes and standards.

Sizing of systems for proposed installation should be
based on heat loss and heat gain calculations made
according to methods of Air Conditioning Contractors of
America (ACCA). The supply flange 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; do not lay on side. Do not stack units.

Additional Publications

These publications can help when installing the air
conditioner. They can usually be found at the local
library or purchased directly from the publisher. Be
sure to consult the 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

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 2100-671
Page 4 of 44

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 ange and combustible materials.

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 2100-671
Page 5 of 44

USING THE TEC-EYE

TEC-EYE (Bard P/N 8301-059) Display and Interface (Status Screen Shown)

TM

FIGURE 1

ALARM KEY

MENU KEY

ESCAPE KEY

ALARM KEY

Allows viewing of active alarms
Silences audible alarms
Resets active alarms

MENU KEY

Allows entry to Main Menu

ESCAPE KEY

Returns to previous menu level
Cancels a changed entry

TEC-EYE Hand-Held Service Tool

The TEC-EYE service tool is used to communicate
with the MEGA-TEC unit logic board. By connecting
directly to the logic board inside the unit control
panel, it is possible to perform diagnostics on the unit,
adjust certain settings and verify unit and economizer
operation through a run test procedure. The TEC-EYE

service tool is required for unit setup and operation.

The TEC-EYE is supplied with the LC6000 controller
but can also be ordered separately (Bard P/N 8301-

059).

The menu driven interface provides users the ability
to scroll through two menu levels: Quick Menu and
Main Menu. The menus permit the user to easily view,
control and configure the unit. See Figure 1 for TEC­EYE display and key functions.

The controller is completely programmed at the factory;
the default setpoints and their ranges are easily viewed
and adjusted from the TEC-EYE display. The program
and operating parameters are permanently stored on
FLASH-MEMORY in case of power failure.

The TEC-EYE connects to the wall-mount unit control
board via an RJ11 modular phone connector as shown
in Figure 2.

UP KEY

ENTER KEY

DOWN KEY

QUICK MENU

UP KEY

Steps to next screen in the display menu
Changes (increases) the value of a modifiable field

ENTER KEY

Accepts current value of a modifiable field
Advances cursor

DOWN KEY

Steps back to previous screen in the display menu
Changes (decreases) the value of a modifiable field

FIGURE 2

TEC-EYE Connection to Unit Control

Modular Connector for TEC-EYE
Hand-Held Diagnostic Tool

When not being used, the TEC-EYE hand-held
diagnostic tool should be stored inside or near the
LC6000 controller. Do not let the TEC-EYE leave the
shelter.

NOTE: Screenshots shown in this manual reflect

default settings (when applicable).

MIS-3953

Manual 2100-671
Page 6 of 44

TEC-EYE Menu Structure

Quick Menu
Setpoints
Information
Alarm Log
Main Menu
System Configuration
Advanced System Configuration
I/O Configuration
Digital Inputs
Digital Outputs
Analog Inputs
Analog Outputs
Fans/Blowers
Manual EEV
On/Off
Alarm Logs
Settings
Date/Time
Language
Initialization
Serial Ports
Change Password
Logout

In addition to the menu structure above, there are also
Status and Alarm screens.

TEC-EYE Acronyms

MAT – Mixed air temperature
RAT – Return air temperature
SAT – Supply air temperature
OAT – Outdoor air temperature
OAH – Outdoor air humidity
Blower – Indoor blower speed
Fan – Outdoor fan speed
Econ – Free cooling

NOTE: Digital refers to On/Off whereas analog is a

variable input.

Main Status Screen

The main Status screen is the default start-up screen
and also the return screen after 5 minutes of no
activity. The screen can be accessed at any time by
pressing the ESCAPE key repeatedly.

The wall-mount unit address is displayed in the upper
right corner on the main Status screen (see Figure

1). The main Status screen also shows the current
date, time, mixed air temperature (MAT), return air
temperature (RAT), supply air temperature (SAT),
outdoor air temperature (OAT) and outdoor air humidity
(OAH). Blower speed, condenser fan speed, damper
position and unit status are also displayed. See Table 1
for wall-mount unit status messages.

The Quick Menu is accessible from the main Status
screen. Setpoints, Information and Alarm Log are
available through the Quick Menu. Pressing the UP or

TABLE 1

Unit Status Messages

Message Description

Waiting...

Orphan Mode

LC Online

Cont. Blower

Freecooling Unit is actively economizing.

Optimized Cool

Cooling Unit is actively mechanical cooling.

Heating Unit is actively heating.

Passive Dehum

Self Test Unit is performing a run test.

Off by Alarm

Off by LC

Off by Keyboard

Emergency Vent

Emergency Cool

Emergency Off

PLC is on and has not started

running the application yet.

Unit is on and in orphan mode with

no calls for heating or cooling.

Unit is on and communicating with

the LC6000 with no heating or

cooling calls.

Unit is operating with continuous

blower when no heating or cooling

calls are present.

Unit is mechanical cooling while

actively economizing.

Unit is taking measures to decrease
humidity without using extra energy.

Unit has major fault preventing

operation.

Unit has been turned off by the

supervisory controller.

Unit has been turned off by the

local user.

Unit is in Emergency Ventilation.

LC6000 has an active hydrogen

alarm.

Unit is in Emergency Cooling.

Indoor temperatures have exceded

high temp alarms.

Unit is in Emergency Off. LC6000

has an active smoke alarm.

DOWN keys while on the main Status screen will change
the Quick Menu icon displayed (see Figure 3). Press the
ENTER key when the desired icon is displayed.

FIGURE 3

Quick Menu Icons

Data Log Information

Setpoints

Manual 2100-671
Page 7 of 44

Quick Menu

Setpoints

From this screen, the local unit heating and cooling
setpoints, used for orphan mode only, can be changed.

Once the supervisory controller is connected, cooling
and heating setpoints will be communicated and local
cooling and heating setpoints will be replaced with the
communicated cooling and heating setpoints.

If at any time the wall-mount unit(s) loses
communication with the LC6000 controller, the wall­mount unit(s) will go into orphan mode and operate
using the last communicated setpoints.

To verify or change the wall-mount unit cooling and
heating setpoints in orphan mode:

1. Connect the TEC-EYE diagnostic tool to the control
board located in the unit.

2. From the Status screen, press UP or DOWN key
until Quick Menu displays Setpoints icon. Press
ENTER key.

3. Press ENTER key to scroll to the selected choice
(see Figure 4).

4. Press UP or DOWN key on desired value until value
displays correctly.

5. Press ENTER key to save and scroll to next
parameter.

6. Press ESCAPE key until Main Menu screen is
displayed.

temperature, liquid line pressure, condensing saturated
temperature, suction line temperature, suction line
pressures, suction saturated temperature, super heat,
sub-cooling and electronic expansion valve position.

FIGURE 5

A/C Circuit Measurements

FIGURE 4

Cool and Heat Setpoints

Information

The information screens are used as a quick reference to
show unit A/C circuit measurements and program version.

A/C Circuit Information

MEGA-TEC Series wall-mounted air conditioners have
two separate refrigeration circuits: Circuit 1 is the two
stage system located on the left side of the unit and
circuit 2 is the single stage system on the right side.

A/C Circuit Information can be found in four screens
within the information menu (see Figure 5). The
information and measurements provided are liquid line

Manual 2100-671
Page 8 of 44

Program Version

The Program Version screen displays the model number
of the unit as well as all program version information
for the PLC (see Figure 6). This information can be
used to determine whether a software update may be
required based on information found in the software
change log. This change log can be found at http://
www.bardhvac.com/software-download/.

FIGURE 6

Program Version

NOTICE

It is important to check the software version

during installation to ensure that the latest

version has been installed. Current software

versions, change log and installation

instructions are available on the Bard website at

http://www.bardhvac.com/software-download/

Alarm Log

The alarm log screens show a log of each alarm. There
will be a log for when alarm occurred and if the alarm
auto clears, it will show when the alarm cleared. See
page 11 for information on clearing alarms.

Menu Screens and Password Levels

A System Config: A1-A5 User (2000)
B Adv Sys Config: B1-B4 Technician (1313)
C I-O Config: Technician (1313)
D On/Off: User (2000)
E Alarm Logs: User (1313)
F Settings

Date/Time: Technician (1313)
Language: User (2000)
Serial Ports: Technician (1313)
Password Change
Initialization
Alarm Initialization: User (2000)
Default Installation: Engineer (9254)

Alarm Export: User (2000)
Unit of Measure:
G

Logout: Used to log out of the current password level.
Entering back into the menu requires password.

Parameters Import/Export: Engineer (9254)

TABLE 2

LC6000/TEC-EYE Passwords (Defaults)

User 2000

Technician 1313

Engineer 9254

Use UP or DOWN keys and ENTER key to enter password

The passwords listed above are the default passwords.
End users can change these passwords if additional
security is desired.

Manual 2100-671
Page 9 of 44

Executing a Run Test

This unit has the ability to perform a run test that will
operate all available unit functions in order to quickly
determine unit operation. Some unit parameters are
adjustable.

To execute a run test:

1. Press MENU key to access the Main Menu screen.

2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.

3. Press UP or DOWN keys to scroll to Sys Config;
press ENTER key.

4. Press UP or DOWN keys to scroll to Run Test A9
screen.

5. Press ENTER key to scroll to Enable parameter
(see Figure 7).

6. Press UP or DOWN key to change value to Yes.

7. Press ENTER key to save value.

FIGURE 7

Executing Run Test

Reset to Factory Defaults

To reset to factory default settings:

1. Press MENU key to go to the Main Menu screen.

2. Use UP or DOWN keys and ENTER key to enter
ENGINEER password 9254.

3. Press UP or DOWN keys to scroll to Settings; press
ENTER key.

4. Press UP or DOWN keys to scroll to Initialization;
press ENTER key.

5. Press UP or DOWN keys to scroll to the Default
Installation screen.

6. Press ENTER key to scroll to Wipe retain mem.
(see Figure 8).

7. Press UP or DOWN key to change value to YES;
press ENTER key.

8. System will restart with default values.

FIGURE 8

Restoring Factory Default Settings

Run Test Parameter Descriptions

Econ Stage Time: Amount of time (in seconds)
allowed for damper blade movement in each
direction.

Heat/Cool Stage Time: Amount of time (in seconds)
allowed for each stage of heating or cooling.

Manual 2100-671
Page 10 of 44

OPERATION

NOTE: Screenshots shown in this manual reflect

default settings (when applicable).

Unit On/Off

The wall-mount unit can be turned on and off from
the TEC-EYE. Turning the unit off with the following
instructions will disable all unit operation.

To turn the unit on or off:

1. Press MENU key to go to the Main Menu screen.

2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.

3. Press UP or DOWN keys to scroll to On/Off; press
ENTER key.

4. Press UP or DOWN keys to change value from On
to Off or from Off to On.

5. Press ESCAPE key several times to return to Main
Menu screen.

The wall-mount unit may also be turned off by
certain events such as the unit disable input, blower
offline, fan offline, panel switch open or the return air
temperature sensor failure when not connected to the
LC6000.

The unit will also be turned off if the unit loses
communication with the expansion board, blower
motor, condenser fan motor or panel switch for blower
or condenser fan compartment.

Alarm Adjustment

Acknowledging Alarms

Alarm conditions activate a red LED indicator that
backlights the ALARM function key. As an option, an
alarm condition may also be enunciated by an audible
alarm signal. An alarm is acknowledged by pressing the
ALARM key. This calls up alarm display screen(s) that
provide a text message detailing the alarm condition(s).

Clearing Alarms

Alarms can only be cleared after the alarm condition
has been corrected. To clear a single alarm, press and
hold the ALARM key for 3 seconds while viewing a
specific alarm screen. To clear all alarms, navigate to
the screen at the end of the alarm list (shown in Figure

9) and press and hold the ALARM key for 3 seconds.

FIGURE 9

Clearing All Alarms

Clearing Alarm Logs and Counters

To clear the alarm log and alarm counters:

1. Press MENU key to go to the Main Menu screen.

2. Use UP or DOWN keys and ENTER key to enter
USER password 2000.

3. Press UP or DOWN keys to scroll to Settings; press
ENTER key.

4. Press UP or DOWN keys to scroll to Initialization;
press ENTER key. (Alarm Management screen will
be displayed.)

5. Press ENTER key to scroll to Delete alarm logs?
(see Figure 10).

6. Press UP or DOWN key to change value to YES;
press ENTER key.

7. Press ENTER key to scroll to Clear AutoReset
counters?

8. Press UP or DOWN key to value to YES; press
ENTER key.

FIGURE 10

Clearing Alarm Logs and Counters

Exporting Alarm Logs

See latest version of Supplemental Instructions manual
7960-825 for information on exporting alarm logs.

Manual 2100-671
Page 11 of 44

Exporting 7 Day Logs

See latest version of Supplemental Instructions manual
7960-826 for information on exporting 7 day I/O logs.

Exporting Parameters

See latest version of Supplemental Instructions manual
7960-827 for information on exporting parameters.

Zone

When paired with a supervisory controller that uses
zones to control groups of wall units, this unit uses the
zone setting to relay to the supervisory controller what
zone it is set to operate in. Up to three zones can be
established with up to 14 units in a single zone. (The
LC6000 supervisory controller can control up to a total
of 14 units.)

To change the zone:

1. Press MENU key to access the Main Menu screen.

2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.

3. Press UP or DOWN keys to scroll to Sys Config;
press ENTER key.

4. Press UP or DOWN keys to scroll to Unit Setup A1
screen.

5. Press ENTER key to scroll to Zone (see Figure 11).

6. Press UP or DOWN keys to change to the desired
value (1, 2 or 3).

7. Press ENTER key to save value.

This sensor can be verified and adjusted by:

1. Press MENU key to go to the Main Menu screen.

2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.

3. Press UP or DOWN keys to scroll to I/O Config;
press ENTER key.

4. Press UP or DOWN keys to scroll to Analog Inputs;
press ENTER key.

Press UP or DOWN keys to scroll to Analog Ins 1/19.

5.

6. Verify the measurement displayed on screen is
accurate (see Figure 12).

7. If the measurement needs to be adjusted, apply an
offset value by pressing ENTER to scroll to Offset.

8. Press UP or DOWN keys to adjust the offset.

9. The update will not take effect until the cursor is
moved out of the Offset parameter.

10. Once adjusted, press the ESCAPE key several
times to return to Main Menu screen.

FIGURE 12

Adjusting Return Air Temperature Sensor

FIGURE 11

Changing Zone

Temperature Control

Temperature Control Components

Return Air Temperature Sensor

The unit is equipped with a return air temperature
sensor to monitor the space temperature when the unit
is in orphan mode. The return air sensor is located
in the upper part of the return opening in such a way
that it is exposed to the entering airstream. An alarm
signal will be sent to the LC controller if the return air
temperature sensor is disconnected. The temperature is
measured with a 10k ohm NTC thermistor.

Return Air Temperature Alarm

When the return air temperature sensor value is out of
range (-41.0 to 303.0°F), the controller will generate
a sensor failure alarm to indicate the sensor is not
working properly.

This alarm is fixed and cannot be adjusted.

Temperature Control Operation

The unit utilizes differentials while in orphan mode to
control the space temperature. The differential values
all reference the setpoint therefore allowing the control
band to be easily changed using the setpoint. To change
specific staging characteristics, each differential can
be modified individually. There are separate setpoints
and differentials for cooling and heating. Specific to
the cooling differentials, the economizer will always be
utilized first on a cooling call unless outdoor conditions
are not acceptable for free cooling. In this case, the
compressor will be activated at stage 1 in place of the
economizer. All remaining stages will be shifted until
the economizer becomes available again.

Manual 2100-671
Page 12 of 44

To change or view the unit setpoint:

1. From the Status screen, press UP or DOWN key
until Quick Menu displays Setpoints icon ( ).
Press ENTER key.

2. Press ENTER key to scroll to Cool Setpoint or Heat
Setpoint (see Figure 4 on page 8).

3. Press UP or DOWN keys to change the value to
desired heating and/or cooling setpoint.

Orphan Mode

MEGA-TEC Series wall-mount units have the capability
to run without the LC6000 controller attached—this
feature is called orphan mode. This keeps the shelter
between 60°F and 77°F (factory default settings) by
the use of the factory-installed return air sensor in
each wall-mount unit. In orphan mode, no auxiliary
temperature measurement devices are required for
operation. The wall-mount unit automatically uses a
continuous blower setting to circulate room air into
the return air inlet and uses the return air temperature
sensor to control room temperature.

If at any time the wall-mount unit(s) loses
communication with the LC6000 controller, the wall­mount unit(s) will go into orphan mode and operate
using the last communicated setpoints.

To change default setpoints, refer to Setpoints on page 8.

During installation, the ability to run in orphan mode
allows deactivation of one of the existing, older wall­mount units, while keeping the shelter cool with the
other unit still operating. Once the first of the Bard
wall-mount units is installed and powered on, it will

operate in orphan mode—keeping the climate inside
the shelter stable and the installers comfortable while
the remainder of the older equipment is removed and
the remaining Bard wall-mount units and LC6000
controller are installed.

Additionally, should any or all of the MEGA-TEC Series
wall-mount units lose communication with the LC6000
controller (such as during maintenance), they will
continue to serve the shelter’s needs until a repair can
be made.

LC6000 Control

When the unit is connected to a LC6000 supervisory
controller, the cooling and heating stages will be
controlled by the LC6000. For more information on
LC6000 staging, see latest version of LC6000 Service
Instructions 2100-669.

Cooling (with Economizer)

If equipped with an economizer, the unit is equipped
with 1 stage of free cooling and 3 stages of mechanical
cooling for a total of 4 cooling stages (see Figure 13).

Cooling (without Economizer)

In a situation where the unit is either not equipped
with an economizer or is equipped with an economizer
but the outdoor conditions are not favorable for
economizer operation, the staging will use Stage 1, 2
or 3 differentials (see Figure 14 on page 14).

Heating

The unit can be equipped with 0, 1 or 2 stages of
electric heat (see Figure 15 on page 14).

Compressor 1 Stage 2

Compressor 2

Compressor 1 Stage 1

Free Cooling

FIGURE 13

Cooling (with Economizer)

75.0°F 75.5°F 76.0°F 76.5°F 77.0°F 77.5°F 78.0°F 78.5°F 79.0°F 79.5°F 80.0°F 80.5°F 81.0°F

Off

Cooling Deadband

Cooling

Manual 2100-671
Page 13 of 44

Compressor 1 Stage 2

Compressor 2

Compressor 1 Stage 1

FIGURE 14

Cooling (without Economizer)

75.0°F 75.5°F 76.0°F 76.5°F 77.0°F 77.5°F 78.0°F 78.5°F 79.0°F 79.5°F 80.0°F 80.5°F 81.0°F

Off

FIGURE 15

Electric Heater 2

Electric Heater 1

58.0°F 58.5°F 59.0°F 59.5°F 60.0°F 60.5°F 61.0°F 61.5°F 62.0°F

Heating

Electronic Expansion Valve (EEV)

EEV Components

Electronic Expansion Valve

The electronic expansion valve is a stepper motor that
is controlled with a step output from the controller. The
valve is capable of 480 steps represented by a 0-100%
signal on the controller. The motor drives a needle valve
that regulates the flow of refrigerant.

EEV Instructions for Vacuum, Reclaim, Charge Unit

The electronic expansion valve moves to the 20% open
position when the unit is not actively cooling. The
valve may need to be manually positioned for service or
troubleshooting. The valve can be positioned by using a
menu override.

To manually override the valve:

NOTE: The unit must be off to perform this override.

1. Press MENU key to go to the Main Menu screen.

2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.

3. Press UP or DOWN keys to scroll to I/O Config;
press ENTER key.

Cooling Deadband

Cooling

Heating

Heating Deadband

Off

4. Press UP or DOWN keys to scroll to Manual EEV;
press ENTER key.

5. Press UP or DOWN keys to scroll to EEV Circuit 1
or EEV Circuit 2.

6. Press ENTER key to scroll to Service Pos
Figure 16)

.

7. Press UP or DOWN keys to adjust to the desired
value.

Press ENTER key to scroll to Enable.

8

9. Press UP or DOWN key to change Off to On.

10. Press ENTER key to save.

FIGURE 16

Overriding EEV Output

(see

Manual 2100-671
Page 14 of 44