Bard MEGA-TEC W120AP Service Instructions Manual

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Page 1

SERVICE INSTRUCTIONS

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

Page 2

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 ......

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 ......

Manual 2100-671 Page 2 of 44

Page 3

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 .........

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

Manual 2100-671 Page 3 of 44

Page 4

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: (202) 483-9370 Fax: (202) 234-4721

American National Standards Institute (ANSI) 11 West Street, 13th Floor New York, NY 10036 Telephone: (212) 642-4900 Fax: (212) 302-1286

American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. (ASHRAE)

1791 Tullie Circle, N.E. Atlanta, GA 30329-2305 Telephone: (404) 636-8400 Fax: (404) 321-5478

National Fire Protection Association (NFPA) Batterymarch Park P. O. Box 9101 Quincy, MA 02269-9901 Telephone: (800) 344-3555 Fax: (617) 984-7057

Manual 2100-671 Page 4 of 44

Page 5

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

Page 6

USING THE TEC-EYE

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

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

Page 7

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

Page 8

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

Page 9

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

Page 10

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

Page 11

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

Page 12

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.

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

Page 13

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

Page 14

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.

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

Page 15

The valve can also be opened or closed using the EEV service tool (Bard Part # 2151-021). This magnetic EEV service tool (shown in Figure 17) is used to manually open the EEV. To do this, remove the EEV stator coil (red color with retaining nut on top), slide the magnetic tool over the shaft where the stator was removed and turn in a clockwise direction to open the valve to the full open position (directional arrows are provided on the tool). Opening the valve to the full open position will aid in the refrigerant reclamation and evacuation processes.

With the stator removed, the resistance should be 40 ohms +/- 10%. There are two sets of three wires that will have this resistance.

After removing the EEV service tool, reapply the EEV stator coil and retaining nut. Upon powering the unit back up, the control board will automatically drive the EEV back to the fully shut position, and then back to the 20% open position prior to starting the compressor back up. Once the compressor starts, the control board will again modulate the EEV position to control the system superheat.

FIGURE 17

Electronic Expansion Valve (EEV) and Service Tool

EEV Stator

Coil

EEV

used with the suction temperature sensor to provide a real time superheat calculation that determines the EEV position.

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.

5. Press UP or DOWN keys to scroll to Analog Ins

6/19 (for circuit 1) or Analog Ins 8/19 (for circuit

2).

6. Verify the measurement displayed on screen is

accurate (see Figure 18).

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 18

Adjusting Suction Sensor/Transducer

Pressure Values

EEV Service

Tool

System Pressures

To view system pressure and temperatures during this process:

1. From the Status screen, press UP or DOWN key until Quick Menu displays Unit Information icon

( ). Press ENTER key.

2. Press UP or DOWN keys to scroll to A/C Circuit 1 Info and A/C Circuit 2 Info screens (see A/C Circuit Measurements on page 8).

Suction Pressure Transducer

The unit has pressure transducers installed on the suction line between the evaporator coil and compressor (one on refrigerant circuit 1 and one on refrigerant circuit 2). The transducer is used for system monitoring of suction system pressures. The sensor is

Troubleshooting the Suction Pressure Transducer

0-250 psig

-5v Nominal, .5 – 4.5v Actual 4v/250 psig = .016 volts per 1 psig

Example: 125 psig x .016 + .5 volts = 2.5 volts

Formula for Tech: Measured Pressure x .016 + Voltage Offset = Expected Transducer Signal Voltage (see Figure 19 on page 16).

Manual 2100-671 Page 15 of 44

Page 16

FIGURE 19

Voltage to Pressure: Suction Pressure Transducer

Suction Pressure Alarm

When the suction pressure transducer value is measured out of range (0-250 PSIG) and the compressor has been operating for longer than 1 minute, the controller will generate a sensor failure alarm to indicate the sensor is not working properly.

This alarm cannot be adjusted.

Suction Temperature Sensor

The suction temperature sensor is used to calculate superheat. The EEV uses this value to control the EEV. The temperature is measured with a 10k ohm NTC thermistor.

The suction temperature sensor measurement 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.

5. Press UP or DOWN keys to scroll to Analog Ins 10/19 (for circuit 1) or Analog Ins 11/19 (for circuit 2).

6. Verify the measurement displayed on screen is accurate (see Figure 20).

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.

FIGURE 20

Adjusting Suction Temperature Sensor Values

Suction Temperature Alarm

When the suction 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 cannot be adjusted.

Evaporator Freeze Condition Alarm

The freeze condition alarm uses a temperature sensor attached to the evaporator coil to determine if the evaporator is cold enough to potentially start building ice. The controller will generate this alarm when the compressor is running and the coil temperature is below 32°F for 2 minutes. While the alarm is active, the compressor will be deactivated and the blower speed will be set to 80%. The evaporator temperature needs to warm back up to the reset temperature of 55°F for 5 minutes before the alarm will clear and the compressor will be permitted to run again.

The evaporator freeze sensor measurement 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 13/19

5. (for circuit 1) or Analog Ins 14/19 (for circuit 2).

6. Verify the measurement displayed on screen is accurate (see Figure 21).

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.

Manual 2100-671 Page 16 of 44

Page 17

FIGURE 21

Adjusting Evaporator Freeze Sensor Values

EEV Operation

EEV Superheat Control

The electronic expansion valve (EEV) will open or close to maintain 10° of superheat while the compressor is running. When the compressor is not running, the valve will close to the 20% open default position.

Low superheat protection will be active once the superheat value is at or below 5°F. At this point, the control will aggressively close the valve so that superheat is maintained.

5. Press UP or DOWN keys to scroll to Blower 1.

6. Press ENTER key to scroll to Blower Overrides?

(see Figure 22).

7. Press UP or DOWN key to change No to Go. The

override will begin and the screen will change to the override screen (see Figure 22).

The override will last for 5 minutes or until the Fan

Overrides parameter is set to No again.

FIGURE 22

Putting Blower Output into Override Mode

Additional EEV Alarms

Low Superheat Alarm

This alarm will become active when the calculated superheat goes below 5°F. This alarm will clear itself when the condition is no longer present.

This alarm cannot be adjusted.

Indoor Airflow

Indoor Airﬂow Components

Blower

The unit is equipped with a blower that is driven by an electronically commutated motor (ECM). The blower is controlled by a 0-100% signal through Modbus communication. The motor controller converts this signal to a PWM signal. The blower on the W120AP model uses a 22" (560 mm) diameter wheel and operates between 550-1150 rpm.

The blower output can be put into an override mode for veriﬁcation or troubleshooting.

To put the blower into 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.

4. Press UP or DOWN keys to scroll to Fans / Blowers; press ENTER key.

TABLE 3

Rated Airﬂow

Nominal Rated CFM

High Low

W120AP 4000 2800 0.30

Nominal Rated ESP

TABLE 4

Indoor Blower Performance

ESP

(Inch H

W120AP 0.30

Dry

Coil

4160 3890

Wet Coil

Manual 2100-671 Page 17 of 44

Page 18

TABLE 5

Maximum ESP of Operation

Electric Heat Only

Model Static Pressure*

FIGURE 24

Verifying Differential Airﬂow Status

-B0Z

-B09

-B18

-C0Z

-C09

-C18

* Unit is rated for free blow non-ducted operation with

SG-10W Supply Grille and RG-10W Return Grille.

.50" .50" .50"

Blower Status Switch

The unit is equipped with a differential pressure airﬂow switch to monitor the blower (see Figure 23). If the blower is turned on and the switch doesn't close to indicate there is differential pressure between the inlet and outlet of the blower, an alarm will be generated. For switch settings, see Figure 23.

Differential airﬂow status can be viewed 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 Digital Inputs; press ENTER key.

5. Reference AIrﬂw 1 row and Val column (see Figure

24).

FIGURE 23

Dirty Filter Switch and Blower Status Switch

Dirty Filter Switch

(Set @ 1.40)

Blower Status Switch

(Set @ .080)

Blower Status Alarm

When the blower is on for 45 seconds and no airﬂow is detected by the airﬂow switch, the compressor and heating operations will be disabled. The system will wait 5 minutes before trying again. After three consecutive no airﬂow events, the system will generate an alarm and lockout requiring a user reset.

Filters

The unit is equipped with four (4) 20" x 24" x 2" MERV 8 ﬁlters (two per coil). The ﬁlters lift and slide into position making them easy to service. The ﬁlters can be serviced by opening the "hinged" front access panel and locking it into position. Then lift and slide into position as needed.

Dirty Filter Switch

These units are equipped with a differential pressure switch to indicate when the ﬁlter(s) needs to be replaced (see Figure 23). The dirty ﬁlter switch measures the pressure difference across the ﬁlter through silicone tubing routed to the blower and evaporator areas of the unit.

The switch circuit consists of a normally open ﬁlter pressure switch. The switch will open when the pressure differential goes above the setting indicated on the dial. When the pressure difference returns below the setting on the dial, the switch will close.

Adjustment of dirty ﬁlter switch may be necessary to ensure proper operation. See Figure 25 to aid in setting the ﬁlter switch to operate at different percentages of ﬁlter blockage.

Dirty Filter Alarm

The wall-mount unit is equipped with a differential pressure switch input to the controller. When the switch indicates a dirty ﬁlter, the controller will generate an alarm. The alarm will latch once triggered requiring a technician to acknowledge the alarm after replacing ﬁlters. Additionally, an indicator light will be turned on with the alarm and turned off when the alarm clears.

The threshold of this alarm is adjusted by changing the settings on the switch (see Figure 25).

Manual 2100-671 Page 18 of 44

Page 19

FIGURE 25

SCREW TO REMOVE COVER

COVER

TUBE LOCATED IN

AIRSTREAM AFTER FILTE R

INDICATOR ARROW

ADJUSTMENT

KNOB

FILTER LIGHT

Dirty Filter Switch and Filter Indicator Light

Filter Indicator Light

The wall-mount unit is equipped with a 24v indicator light mounted on side of unit that displays the current status of the ﬁlter (see Figure 25). When the light is on, the ﬁlter needs to be replaced. Once the ﬁlter(s) has been changed and the alarm has been cleared, the indicator light will turn off.

Indoor Airﬂow Operation

Blower Speed Control

The blower is capable of changing speeds to best match the requirements of the system depending on which mode the system is in.

The unit will automatically switch to the required speed for each mode. High sensible mode and dehumidiﬁcation mode are both communicated separately from the LC. For more information on the high sensible command from LC, please see LC6000 Service Instructions 2100-669.

MIS-3952

Additional Indoor Airﬂow Alarms

Supply Air Temperature Alarm

When the supply 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.

Condenser Fan

Condenser Fan Components

Condenser Fan

The unit is equipped with a condenser fan that is driven by an electronically commutated motor (ECM). This fan is controlled by a 0-100% command using modbus serial communication. The fan operates between 1001200 rpm.

To enable fan 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.

Manual 2100-671 Page 19 of 44

Page 20

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

4. Press UP or DOWN keys to scroll to Fans / Blowers; press ENTER key.

5. Press UP or DOWN keys to scroll to Condenser Fan 1 (see Figure 26).

6. Press ENTER key to scroll to the Fan Overrides?

7. Press UP or DOWN keys to change the value from No to Go. The override will begin and the screen will change to the override screen (see Figure 26).

The override will last for 5 minutes or until the Fan Overrides parameter is set to No again.

Press UP or DOWN keys to scroll to Analog Ins 7/19

5. (for circuit 1) or Analog Ins 9/19 (for circuit 2).

6. Verify the measurement displayed on screen is accurate (see Figure 27).

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

8. Press UP or DOWN keys to adjust the offset. The update will not take effect until the cursor is moved out of the offset parameter.

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

FIGURE 26

Enabling Fan Override

Liquid Pressure Sensor

The unit has a pressure transducer installed on the liquid line between the condenser and electronic expansion valve (EEV). The transducer is used for condenser fan speed control and for monitoring of system operation. The liquid line transducer is also referred to as the discharge pressure sensor.

The discharge/liquid pressure sensor input 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.

FIGURE 27

Adjusting Discharge/Liquid Transducer

Pressure Values

Troubleshooting the Discharge/Liquid Pressure Transducer

0-650 psig .5 to 4.5v

4.5-.5 + 4 volt range/650 psig = .00615 volts per 1 psig

Example: 325 psig x .00615 + .5 v = 2.5 volts

Formula for Tech: Measured Pressure x .00615 + Voltage Offset = Expected Transducer Signal Voltage (see Figure 28).

FIGURE 28

Voltage to Pressure:

Discharge/Liquid Pressure Transducer

Voltage Offset

Manual 2100-671 Page 20 of 44

Page 21

Discharge/Liquid Pressure Transducer Alarm

When the discharge pressure sensor value is out of range (0-650 PSIG), the controller will generate a sensor failure alarm to indicate the sensor is not working properly.

This alarm is ﬁxed and cannot be adjusted.

Liquid Temperature Sensor

The unit is equipped with a liquid line temperature sensor to monitor the temperature of the liquid refrigerant leaving the condenser and entering the EEV. The temperature is measured with a 10k ohm NTC thermistor.

The liquid temperature 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.

5. Press UP or DOWN keys to scroll to Analog Ins

16/19 (for circuit 1) or Analog Ins 17/19 (for circuit 2).

6. Reference the Value to verify the temperature (see

Figure 29).

7. If an offset needs to be applied, press ENTER key

to scroll to Offset.

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

desired value.

9. Press ENTER key to save.

10. Press ESCAPE key several times to return to Main

Menu screen.

FIGURE 29

Adjusting Discharge/Liquid Temperature Input

Outdoor Temperature Sensor

The unit is equipped with a combination outdoor temperature and humidity sensor. The temperature is measured with a 10k ohm NTC thermistor. See page 286for more information.

Condenser Fan Operation

Condenser Fan Speed Control

The fan will speed up or slow down to attempt to maintain a discharge pressure. The unit will allow the discharge pressure setpoint to increase for high ambient scenarios or decrease for low ambient scenarios. Because the control is dependent on the discharge pressure sensor, the controller will alter its operation if the sensor is not enabled or failed. When the liquid pressure transducer is not enabled or considered failed by the controller, a nominal speed of 74% will be used during a compressor call.

Compressor

Compressor Components

Compressor

Three Phase Scroll Compressor Start Up Information

Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Direction of rotation is not an issue with single phase compressors since they will always start and run in the proper direction.

However, three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a 50-50 chance of connecting power in such a way as to cause rotation in the reverse direction, veriﬁcation of proper rotation must be made. Veriﬁcation of proper rotation direction is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized. Reverse rotation also results in an elevated sound level over that with correct rotation, as well as substantially reduced current draw compared to tabulated values.

Veriﬁcation of proper rotation must be made at the time the equipment is put into service. If improper rotation is corrected at this time, there will be no negative impact on the durability of the compressor. However, reverse operation for over 1 hour may have a negative impact on the bearing due to oil pump out.

NOTE: If compressor is allowed to run in reverse

rotation for an extended period of time, the compressor’s internal protector will trip.

All three phase compressors are wired identically internally. As a result, once the correct phasing is determined for a speciﬁc system or installation, connecting properly phased power leads to the same Fusite terminal should maintain proper rotation direction.

The direction of rotation of the compressor may be changed by reversing any two line connections to the wall-mount unit.

Manual 2100-671 Page 21 of 44

Page 22

Compressor Control Module (CCM)

Delay-on-Make Timer Short Cycle Protection/Delay-on-Break Test Mode High Pressure Detection Brownout Protection with Adjustment

The LPC terminals are jumpered in this application. Instead, the low pressure transducer is used for low pressure monitoring.

Delay-on-Make Timer

In the event of power loss, a delay-on-make timer is included to be able to delay startup of the compressor. This is desired when more than one unit is on a structure so that all of the units do not start at the same time which could happen after a power loss or building shutdown. The delay-on-make time period is 2 minutes plus 10% of the delay-on-break time period. To ensure that all of the units do not start at the same time, adjust the delay-on-break timer on each unit to a slightly different delay time.

FIGURE 30

8201-164 Compressor Control Module

Short Cycle Protection/Delay-on-Break

An anti-short cycle timer is included to prevent short cycling the compressor. This is adjustable from 30 seconds to 5 minutes via the adjustment knob (see Figure

30). Once a compressor call is lost, the time period must expire before a new call will be initiated.

10% of this time is also considered on the delay-onmake timer (see Delay-on-Make Timer).

High Pressure Detection

High pressure switch monitoring allows for a lockout condition in a situation where the switch is open. If the high pressure switch opens, the CCM will de-energize the compressor. If the switch closes, it will then restart the compressor after the delay-on-break setting has expired on the device. If the switch trips again during the same Y call, the compressor will be de-energized. The ALR terminal will be energized, signaling the unit control board that a high pressure event has occurred (see Refrigerant High Pressure Alarm on page 23).

High Pressure Switch Compressor Contactor Output

18-30 VAC Input

Y Input from Thermostat

and High Pressure Switch

Troubleshooting Light

Jumper

Brownout Ignore Time DIP Switches*

Alarm Output

Common

Delay-on-Break Time Adjustment Potentiometer

Manual 2100-671 Page 22 of 44

* Turn on only one switch for that speciﬁc ignore time setting

Page 23

Test Mode

By rapidly rotating the potentiometer (POT) clockwise (see Figure 30), all timing functions will be removed for testing.

The conditions needed for the unit to enter test mode are as follows: POT must start at a time less than or equal to the 40 second mark. The POT must then be rapidly rotated to a position greater than or equal to the 280 second mark in less than ¼ second. Normal operation will resume after power is reset or after the unit has been in test mode for at least 5 minutes.

Brownout Protection with Adjustment

Brownout protection may be necessary if the utility power or generator power has inadequate power to prevent the voltage from dropping when the compressor starts. This is rare but can happen if the generator is undersized at the site or if the site is in a remote location far from the main power grid. Under normal circumstances, allowing the brownout to be ignored for a time period should not be needed. The 8201-164 is shipped with all the DIP switches in the 'off' or 'do not ignore' position (see Figure 30).

If ignoring the brownout is needed because of the above conditions, three preset timers can be set by DIP switches in order to delay signaling a power brownout for a speciﬁc length of time after compressor contactor is energized. This allows the compressor a time period to start even if the voltage has dropped and allows the voltage to recover. This delay only happens when the CC terminal energizes. The delay can be set to 500 milliseconds (A DIP switch), 1000 milliseconds (B DIP switch) or 1500 milliseconds (C DIP switch); time is not cumulative—only the longest setting will apply. If the voltage recovers during the brownout time period, the compressor will start.

If a brownout condition is detected by the 8201-164, the troubleshooting light will ﬂash blue. The light will continue to ﬂash until the cooling call is satisﬁed or power is removed from the Y terminal. This condition does not prevent operation, it only indicates that a brownout condition was present at some point during the cooling call. If a brownout condition is detected, CC will be de-energized and will retry after the delayon-make timer is satisﬁed; this process will continue until call is satisﬁed.

If user chooses the 'do not ignore' position when the site has inadequate utility or generator power, this could lead to the compressor never starting. The control will

see the brownout immediately and not start.

A common scenario and one that has been seen in the ﬁeld is when a unit or units switches from utility power to generator power. With slower transfer switches, the time delay between the utility power and generator power didn’t cause a problem. The units lost power, shut off and came back on line normally. With the introduction of almost instantaneous transfer switches,

the millisecond long power glitch can be enough that the compressor will start to run backwards. In this scenario, the CCM will catch this and restart the units normally.

High Pressure Safety Switch

All units have a high pressure switch as a safety device. This device will open when pressure in the system reaches 650 PSIG. The sensor is directly connected to the dedicated compressor control module (see High

Pressure Detection on page 22).

Refrigerant High Pressure Alarm

When the wall-mount unit receives a signal from the compressor control module (CCM) indicating a high pressure event, the wall-mount unit will generate an alarm. Upon receiving the alarm, the wall-mount unit will remove the “Y” call from the CCM, resetting the status of the CCM. The alarm will stay present on the wall-mount unit until manually cleared with TEC-EYE hand-held diagnostic tool.

In addition to the CCM, the discharge pressure transducer is used to prevent a high pressure event. When the discharge pressure is above the discharge pressure alarm setpoint (set 30 pounds below high pressure switch, which is 650), the system will disable stage 2 of mechanical cooling.

Phase Monitor

Used only on three phase equipment, the phase monitor is a compressor protection device that will prohibit operation of the compressor if the device senses a possible reverse-rotation situation due to incorrect phasing. On a call for compressor (and only compressor), the device will check incoming phase, check for severe voltage imbalance and check for proper frequency. Under nominal conditions, a green LED light will show on the face of the monitor. If there is improper phasing, voltage imbalance or frequency deviation, the device will show a red LED light and prohibit compressor operation.

If a fault condition occurs, reverse two of the supply leads to the unit. Do not reverse any of the unit factory

wires as damage may occur.

Compressor Operation

The compressor will be enabled when the unit (in orphan mode) or LC provide a cooling stage 1 call. The compressor call from the controller has several delays that may affect the start or stop time of the compressor in regards to the cooling demand. The compressor has a minimum on time of 180 seconds to prevent short cycling the compressor. The compressor also has a minimum off time of 120 seconds to prevent start ups before the pressure in the refrigeration system equalizes. When the second stage is engaged, it also has a minimum run time of 120 seconds to allow the system to stabilize before returning to single stage or shutting down.

Manual 2100-671 Page 23 of 44

Page 24

These delays can be changed 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 Adv System Conﬁg; press ENTER key.

4. Press UP or DOWN keys to scroll to Comp. Safety B2; press ENTER key.

5. Press ENTER key to scroll to Min On Time or Min Off Time (see Figure 31).

6. Press UP or DOWN keys to change the value.

7. Press ENTER key to save value and move the cursor to next parameter or top of screen.

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

The address-based delay only applies to the wall-mount unit when in orphan mode. The controller will delay the unit compressor based on the value entered on screen B2 multiplied by the unit address. This is intended to keep multiple units from starting their compressors at the same time when there is a quick change in the load. When connected to the LC, this is taken care of by LC logic.

FIGURE 31

Adjusting Compressor Delays

Economizer

Economizer Components

Actuator

The actuator rotates up to 90° based on a 2-10v signal sent to it by the controller. This component is what opens and closes the damper blade. The unit is equipped with three dampers powered by three separate actuators. The left intake damper (damper 1) and the right intake damper (damper 3) are each powered by a 44 in-lb actuator. The exhaust damper (damper 2) is powered by a 90 in-lb actuator. All dampers are spring return and will close the damper if power is lost.

To verify the output from the controller to the actuator:

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 Analog Outputs; press ENTER key.

4. Press UP or DOWN keys to scroll to Damper System 1/5.

5. To override the current position, press ENTER key to scroll to System OV Pos (see Figure 32).

6. Press UP or DOWN keys to change the value to the desired output.

7. Press ENTER key to save the value and move cursor to Enable Sys. OV.

8. Press UP or DOWN keys to change the value from No to Yes.

9. The damper position will update with the new override value and the damper will travel to that position.

NOTE: This override will last for 5 minutes or until the

Enable Sys. OV is changed back to No.

Additional Compressor Alarms

Refrigerant Low Pressure Alarm

When the suction pressure transducer indicates a pressure value less than the low pressure alarm setpoint of 40 PSIG and there is an active call for cooling, the controller will disable the compressor (after a 120-second delay). NOTE: The second call will be

delayed based on the delay off value mentioned in the compressor section. The controller will try to run the

refrigeration system two (2) times within 900 seconds before the alarm will lock the compressor out. This alarm needs to be manually cleared before compressor operation will resume.

Manual 2100-671 Page 24 of 44

FIGURE 32

Damper Override

Page 25

Dust Sensor

The unit has a dust sensor installed near the outdoor air inlet. The dust sensor checks for excessive particulates in the outdoor air, and will close the economizer if the dust is excessive. The sensor uses a PWM signal converted to 0-5v output to the controller.

To ensure proper performance, cleaning may be required. Vacuuming or blowing the dust off the sensor with forced air is recommended. Avoid inserting any objects into the sensor.

The dust sensor can be veriﬁed 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.

5. Press UP or DOWN keys to scroll to Analog Ins 15/19.

6. Reference the Value for the current sensor reading (see Figure 33).

7. To apply an offset to the current reading, press ENTER key to scroll to Offset.

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

9. Press ENTER key to save the value and move cursor to next parameter.

NOTE: The sensor can be disabled if required for

troubleshooting.

10. With the cursor on the Enable parameter, press UP or DOWN keys to change the value from On to Off.

11. Press ENTER key to save.

Dust Sensor Failure Alarm

When the sensor reads a value that is outside of the acceptable 0 to 100% range, an alarm will be generated indicating the sensor has failed. This alarm is just a notiﬁcation and will not disable any other features on the controller.

This alarm is ﬁxed and cannot be adjusted.

High Dust Limit Alarm

When dust content in the air is high and is a risk to prematurely reducing airﬂow through the ﬁlters, the unit will restrict the use of the economizer. The controller has adjustable software setpoints to indicate dust levels are too high and to disable the economizer operation for 5 minutes. Once the conditions are no longer present, the alarm will automatically clear.

To adjust the dust sensor alarm setpoint:

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 System Conﬁg; press ENTER key.

4. Press UP or DOWN keys to scroll to Dust Conﬁguration A4.

5. Press ENTER key to scroll to Alarm Set (see Figure 34).

6. Press UP or DOWN keys to change to the desired value.

7. Press ENTER key to save the value.

NOTE: When the temperature outside is measured

at or below 0°F, the dust sensor alarm will be disabled to allow economizer operation.

FIGURE 34

Adjusting Dust Sensor Alarm Setpoint

FIGURE 33

Dust Sensor

Manual 2100-671 Page 25 of 44

Page 26

Damper Blade

The system utilizes three damper blades to bring in outdoor air and exhaust space air for economizer operation. Damper 1 is left intake, damper 2 is exhaust and damper 3 is right intake. Damper blades are made of sheet metal and are integrated into the equipment.

To view damper blade position:

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 Outputs; press ENTER key.

5. Press UP or DOWN keys to scroll to Damper Intake

Lt 2/5 (see Figure 35), Damper Intake Rt 3/5 or Damper Exhaust 1.

FIGURE 35

Damper Blade Position

Damper Switch

The economizer utilizes three magnetic switches (one on each damper blade) to determine if the damper is operating correctly. This switch will be closed when the damper is closed and open when the damper is open.

To verify the status of the switch:

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 Digital Inputs; press ENTER key.

5. Press UP or DOWN keys to scroll to Digital Ins 2/2.

6. Reference the values for Damper 1, Damper 2, Damper 3 and Damper 4 (see Figure 36).

7. The input will display ON when the damper is closed (reﬂecting closed circuit on damper switch) and will display OFF when the damper is open (reﬂecting open circuit on damper switch).

FIGURE 36

Damper Switch

Damper Failed to Open Alarm

When the controller commands the economizer damper actuator to a position other than 0% and the damper switch indicates the damper is not open, after a delay of 20 seconds the controller will generate a damper failed to open alarm. This alarm is just a notiﬁcation and will not disable any features on the controller.

The alarm must be cleared by a user reset.

Damper Failed to Close Alarm

When the controller commands the economizer damper actuator to the 0% position and the damper switch indicates the damper is not closed, after a delay of 300 seconds the controller will generate a damper failed to close alarm. This alarm is just a notiﬁcation and will not disable any features on the controller.

The alarm must be cleared by a user reset.

Outdoor Temperature and Humidity Combination Sensor

The unit is equipped with a combination outdoor temperature and humidity sensor to monitor outdoor conditions for the economizer operation. The temperature is measured with a 10k ohm NTC thermistor. The humidity is measured with a humidity sensor that outputs a 4-20mA signal to the controller.

The outdoor temperature can be veriﬁed 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.

5. Press UP or DOWN keys to scroll to Analog Ins 4/19.

6. Reference the Value to see the input of the sensor (see Figure 37).

7. To apply an offset, press ENTER key to scroll to Offset.

8. Press UP or DOWN keys to change to the desired value.

Manual 2100-671 Page 26 of 44

Page 27

9. Press ENTER key to save the value.

FIGURE 37

Outdoor Temperature Sensor

The outdoor humidity can be veriﬁed 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.

5. Press UP or DOWN keys to scroll to Analog Ins 5/19.

6. Reference the Value to see the input of the sensor (see Figure 38).

7. To apply an offset, press ENTER key to scroll to Offset.

8. Press UP or DOWN keys to change to the desired value.

9. Press ENTER key to save the value.

Outdoor Humidity Sensor Failure Alarm

When the sensor reads a value that is outside of the acceptable 0 to 100% RH range, an alarm will be generated indicating the sensor has failed. This alarm condition will disable the economizer when the mode is set to temperature and humidity or enthalpy.

This alarm is ﬁxed and cannot be adjusted.

Mixed Air Temperature Sensor

The unit is equipped with a mixed air temperature sensor to monitor the mixed air temperature. The mixed air is measured where the economizer mixes return air and outdoor air. This measurement is used to determine if the economizer is controlling correctly. The sensor is a 10k ohm NTC Thermistor.

The mixed air temperature can be veriﬁed 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.

5. Press UP or DOWN keys to scroll to Analog Ins 18/19.

6. Reference the Value to see the input of the sensor (see Figure 39).

7. To apply an offset, press ENTER key to scroll to Offset.

8. Press UP or DOWN keys to change to the desired value.

9. Press ENTER key to save the value.

FIGURE 38

Outdoor Humidity Sensor

Outdoor Temperature Sensor Failure Alarm

When the sensor reads a value that is outside of the acceptable -41 to 303.0° range, an alarm will be generated indicating the sensor has failed. This alarm condition will disable the economizer.

This alarm is ﬁxed and cannot be adjusted.

FIGURE 39

Mixed Air Temperature Sensor

High Mixed Air Temperature Alarm

To keep the economizer from bringing in air that is too warm, an alarm will be generated when the mixed air is 2° above the return air temperature for 300 seconds. This alarm will not be generated if the mixed air temperature sensor has failed. The alarm can only be

Manual 2100-671 Page 27 of 44

Page 28

activated during a free cooling call. The alarm is a user reset and must be cleared by the end user.

Low Mixed Air Temperature Alarm

To keep the economizer from bringing in air that is too cold, an alarm will be generated when the mixed air temperature is 5°F below the mixed air temperature control setpoint for 300 seconds. If this alarm is active, the economizer will be disabled for the current cooling call. This alarm will reference the mixed air temperature control setpoint to ensure that when the mixed air setpoint changes, the alarm dynamically changes with it. This alarm will not be generated if the mixed air temperature sensor has failed. The alarm can only be activated during a free cooling call and requires a user reset.

Economizer Operation

The economizer has four types of operation. The ﬁrst mode is "None" where the economizer is never utilized, except for emergency purposes. The second mode is "Dry Bulb" where the outdoor temperature is the only consideration for economizer use on a free cooling call. The third mode is "TempHum" where the outdoor temperature and humidity are considered for economizer use on a free cooling call. The fourth mode is "Enthalpy" where the outdoor temperature, humidity and calculated dew point are considered for economizer operation on a free cooling call.

To change the economizer type:

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 System Conﬁg; press ENTER key.

4. Press UP or DOWN keys to scroll to Economizer Setup A2; press ENTER key.

5. Press ENTER key to scroll to Type (see Figure 40).

Press UP or DOWN keys to change the Type desired

6. value to None, Dry Bulb, TempHum or Enthalpy.

7. Press ENTER key to save the value and scroll to the next parameter.

FIGURE 40

Economizer Setup

NOTE: The following parameters are for the

temperature consideration for economizer use. Applies to Dry Bulb, TempHum and Enthalpy type.

8. The cursor should now be on the Mixed Air Tamp parameter.

9. Press UP or DOWN keys to change the parameter to the desired value.

10. Press ENTER key to save the value and scroll to the next parameter.

11. The cursor should now be on Delay parameter.

12. Press UP or DOWN keys to change the parameter to the desired value.

13. Press ENTER key to save the value and move to the next parameter.

14. The cursor is now on the Min Position parameter.

15. Press UP or DOWN keys to change the parameter to the desired value (see Economizer Operation − Minimum Position for more information).

16. Press ENTER key to save the value.

17. Press the DOWN key to navigate to the A3 screen.

NOTE:

18. Press ENTER key to scroll to OA Temp Set (on

19. Press UP or DOWN keys to change the temperature

20. Press ENTER key to save the value and scroll to

21. Press UP or DOWN keys to adjust the outdoor

22. Press ENTER key to save the value and scroll to OA

23. Press UP or DOWN keys to adjust the humidity

24. Press ENTER key to save the value and scroll to On

25. Press UP or DOWN keys to adjust the outdoor

26. Press ENTER key to save the value and scroll to

The A3 screen will not display if economizer mode is set to None. Also, the contents of the screen will change depending on which type is chosen: Dry Bulb (Figure 41), TempHum (Figure

42) or Enthalpy (Figure 43). The following menu shows the Enthalpy content which also contains parameters that would be shown on Dry Bulb (temperature only) and TempHum (temperature and humidity only).

Drybulb Control and Temp/Hum Control A3 screens, this parameter will be titled Outdoor Set).

setpoint to desired value.

Off Diff.

temperature differential for which the economizer is re-enabled.

Hum Set.

setpoint to desired value.

Diff.

humidity differential for which the economizer is re-enabled.

Dew Pt. Set.

Manual 2100-671 Page 28 of 44

Page 29

FIGURE 41

Economizer Setup – Dry Bulb Control

FIGURE 42

Economizer Setup – Temp/Hum Control

FIGURE 43

Economizer Setup – Enthalpy Control

27. Press UP or DOWN keys to adjust the outdoor dew

point setpoint for economizer operation to the desired value.

28. Press ENTER key to save the value and scroll to On

Diff.

29. Press UP or DOWN keys to adjust the dew point

differential for which the economizer is re-enabled.

30. Press ENTER key to save the value.

31. Press ESCAPE key several times to return to Main

Menu screen.

See Table 6 for default settings for economizer operation.

When the economizer is activated during a free cooling call only, using any of the previously mentioned modes, a 0-10v analog signal will be sent to the economizer actuator. The actuator will then open and close the damper blades to maintain a mixed air temperature of 55°F. When the mixed air temperature increases, the damper will open and when the mixed air temperature decreases, the damper will close.

The economizer may be disabled by the LC if the system determines it needs to enter dehumidiﬁcation mode. More information about the dehumidiﬁcation sequence can be found in the latest revision of LC6000 Service Instructions 2100-669. In addition to dehum mode, the economizer may be disabled for 5 minutes (adjustable) if the dust sensor indicates the outdoor air may cause particulate buildup in the air ﬁlters. After the time has expired and on a call for cooling, the economizer will open again to sample the air. The wall-mount unit will either return to normal operation or remain locked out for another 5 minutes.

Economizer Operation – Minimum Position

The economizer has an option to set minimum position for the economizer. The minimum position will only be active while the blower is operating. To enable minimum position all the time, continuous blower must be activated for the wall unit in the LC6000. See latest version of LC6000 Service Instructions 2100-669 for continuous blower conﬁguration.

Mode Consideration Economizer Available for Cooling Economizer Not Available for Cooling

Only

Temp

Temp &

Humidity

* In Enthalpy mode, outdoor temperature, humidity and calculated dew point are all considered for economizer operation.

Temperature

Humidity

Enthalpy*

Dew Point

TABLE 6

Economizer Default Settings

When the outdoor air temperature is below 70°F

When the outdoor humidity is below 80%

When the outdoor dew point is below 55°F

When the outdoor air temperature is above 75°F

When the outdoor humidity is above 80%

When the outdoor dew point is above 60°F

Manual 2100-671 Page 29 of 44

Page 30

To set the minimum position value:

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 System Conﬁg; press ENTER key.

4. Press UP or DOWN keys to scroll to Economizer Setup A2.

5. Press ENTER key to scroll to Min Position (see Figure 40 on page 28).

6. Press UP or DOWN keys to change to the desired value.

Miscellaneous Components

Supply Temperature Sensor

The unit is equipped with a supply air temperature sensor to monitor the leaving air temperature of the unit. The temperature is measured with a 10k ohm NTC thermistor.

The supply air temperature can be veriﬁed 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.

5. Press UP or DOWN keys to scroll to Analog Ins 2/19.

6. Reference the Value to see the input of the sensor (see Figure 44).

7. To apply an offset, press ENTER key to scroll to Offset.

8. Press UP or DOWN keys to change to the desired value.

9. Press ENTER key to save the value.

Supply Temperature Sensor Failure Alarm

When the sensor reads a value that is outside of the acceptable -41.0 to 303.0° range, an alarm will be generated indicating the sensor has failed.

This alarm is ﬁxed and cannot be adjusted.

Emergency Cooling Mode

If the shelter temperature is above the high temperature alarm setpoint on the LC, the unit will be commanded into emergency cooling mode. In this mode, the unit will operate the economizer regardless of the economizer setup, as long as the outdoor temperature is below the indoor temperature. This will stay active until the LC returns the unit to normal operation.

Emergency Cooling − Orphan Mode

When the unit is not connected to the LC6000 and operating in orphan mode, the unit still has the capability to operate in emergency cooling mode. By default this feature is not enabled.

To enable emergency cooling in orphan mode:

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 Adv System Conﬁg; press ENTER key.

4. Press UP or DOWN keys to scroll to Emer. Cool B5.

5. Press ENTER key to scroll to Use emergency cool in Orphan Mode? (see Figure 45).

6. Press UP or DOWN keys to change the value.

FIGURE 45

Emergency Cool – Orphan Mode

FIGURE 44

Supply Air Temperature Sensor

Manual 2100-671 Page 30 of 44

When this feature is used instead of using the zone sensor, an alarm will be triggered by the high return air temperature alarm.

To adjust the return air temperature settings:

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.

Page 31

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

4. Press UP or DOWN keys to scroll to Return Air Alarm A5.

5. Press ENTER key to scroll to Enable, Lower Limit or Upper Limit (see Figure 46).

6. Press UP or DOWN keys to disable the alarm or change the limit values.

FIGURE 46

Adjusting Return Air Alarm Settings

Emergency Ventilation Mode

If the emergency ventilation input at the LC is active, the system will go into emergency ventilation mode. In emergency ventilation mode, the economizers on the wall units will be commanded to 100%. This mode is only available when connected to the LC.

NOTE:

All units will receive the emergency ventilation command. Wall units not equipped with economizers will still engage the blower.

Unit Disable Option

The unit is equipped with an input that can be used to turn off the unit.

The unit disable input 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 Digital Inputs; press ENTER key.

5. Press UP or DOWN keys to scroll to Digital Ins 1/2.

6. Reference Disable row and En column (see Figure

47).

7. Press ENTER key to scroll to Disable En value.

8. Press UP or DOWN key to change value.

9. Press ENTER key to scroll to Dir.

10. Press UP or DOWN key to change direction (N/O or N/C), if applicable.

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

FIGURE 47

Unit Disable Option

Electric Heat Option

Electric Heat Components

Electric Heating Element

The unit can be optionally equipped with 9kw or 18kw of heat. The 9kw is a single stage heating element. The 18kw option comes equipped with two 9kw heating elements that operate in two stage. The heating elements are located downstream of the evaporator coils and can be accessed through the upper control panel door.

Thermal Overload

The heater assembly has a thermal overload wired in series with the heating element. This device has a cycling limit which opens at 130°F and resets at 80°F. The limit is also equipped with a redundant thermal fuse that will open at 150°F.

Electric Heat Operation

The heat strip will be activated on a call for heat. This call can be generated by the LC or the wall-mount unit operating in orphan mode.

Serial/Model Number Configuration

MEGA-TEC wall-mount units conﬁgure some settings based on the model number that is input into the unit. The model and serial number are entered at the factory, and should be retained during a software update. However, after a software update, it is best practice to verify that the model and serial number is still present and accurate. If the model and/or serial number is missing or incorrect they will need to be re-entered.

To update serial/model numbers:

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

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

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

Manual 2100-671 Page 31 of 44

Page 32

4. Press UP or DOWN keys to scroll to Unit Setup B1 (see Figure 48).

5. Press ENTER key to advance the cursor to the digit that needs changed in the serial/model number.

6. Press UP or DOWN keys to change value of the digit.

7. Continue Steps 5 and 6 until the serial/model number(s) are correct and reﬂect the number on the product label.

For more information on the options and settings available for speciﬁc model numbers, see the model number breakdown in Figure 49.

FIGURE 48

Serial/Model Number Conﬁguration

Manual 2100-671 Page 32 of 44

Page 33

MEGA-TEC Wall-Mount Unit Model Nomenclature

W 120 A P B 0Z E P 1 X X X

MODEL SERIES

MAXIMUM SENSIBLE CAPACITY

120 – 10 Ton 3 Stage Capacity

REVISION

A – Revision Level

CONTROL LOGIC AND CLIMATE OPTIONS

P – Programmable Logic Board

B – 230/208-60-3

C – 460-60-3

E – 220/200-50-3

VOLTS & PHASE

Q – 575-60-3

V – 415/380-50-3

FIGURE 49

0Z – O kW with Circuit Breaker 09 – 9 kW with Circuit Breaker

18 – 18 kW with Circuit Breaker

M – MERV11 Disposable P – MERV8 2" Pleated N – MERV13 2" Pleated

X – Copper/Aluminum Evaporator Coil, Copper/Aluminum Condenser Coil

4 – Condenser Section Component Coating, Coated Evaporator Coil, Coated Condenser Coil

5 – Internal and External Cabinet Component Coating, Coated Evaporator Coil, Coated Condenser Coil

X – Standard accessories including airﬂow sensor, dirty ﬁlter sensor, pressure transducers, crankcase heater

ELECTRIC HEAT

VENT PACKAGE

B – No Vent

E – Economizer (DB and WB)

FILTER

COLOR AND CABINET FINISH

1 – White Baked Enamel Finish

OUTLET

X – Future Use

COIL AND UNIT COATING OPTIONS

1 – Coated Evaporator Coil 2 – Coated Condenser Coil

3 – Coated Evaporator Coil, Coated Condenser Coil

ACCESSORIES AND CONTROLS OPTIONS

Manual 2100-671 Page 33 of 44

Page 34

REFRIGERANT INFORMATION

These units require R-410A refrigerant and polyol ester oil.

General

1. Use separate service equipment to avoid cross contamination of oil and refrigerants.

2. Use recovery equipment rated for R-410A refrigerant.

3. Use manifold gauges rated for R-410A (800 PSI/250 PSI low).

4. R-410A is a binary blend of HFC-32 and HFC-

125.

5. R-410A is nearly azeotropic—similar to R-22 and R-12. Although nearly azeotropic, charge with liquid refrigerant.

6. R-410A operates at 40-70% higher pressure than R-22, and systems designed for R-22 cannot withstand this higher pressure.

7. R-410A has an ozone depletion potential of zero, but must be reclaimed due to its global warming potential.

8. R-410A compressors use polyol ester oil.

9. Polyol ester oil is hygroscopic; it will rapidly absorb moisture and strongly hold this moisture in the oil.

10. A liquid line dryer must be used—even a deep vacuum will not separate moisture from the oil.

11. Limit atmospheric exposure to 15 minutes.

12. If compressor removal is necessary, always plug compressor immediately after removal. Purge with small amount of nitrogen when inserting plugs.

Topping Off System Charge

If a leak has occurred in the system, Bard Manufacturing recommends reclaiming, evacuating (see criteria above) and charging to the nameplate charge. If done correctly, topping off the system charge can be done without problems.

With R-410A, there are no signiﬁcant changes in the refrigerant composition during multiple leaks and recharges. R-410A refrigerant is close to being an azeotropic blend (it behaves like a pure compound or single component refrigerant). The remaining refrigerant charge in the system may be used after leaks have occurred. “Top-off” the charge by utilizing the pressure charts on the inner control panel cover as a guideline.

REMEMBER: When adding R-410A refrigerant, it must come out of the charging cylinder/tank as a liquid to avoid any fractionation and to insure optimal system performance. Refer to instructions for the cylinder that is being utilized for proper method of liquid extraction.

Safety Practices

1. Never mix R-410A with other refrigerants.

2. Use gloves and safety glasses. Polyol ester oils can be irritating to the skin, and liquid refrigerant will freeze the skin.

3. Never use air and R-410A to leak check; the mixture may become ﬂammable.

4. Do not inhale R-410A—the vapor attacks the nervous system, creating dizziness, loss of coordination and slurred speech. Cardiac irregularities, unconsciousness and ultimately death can result from breathing this concentration.

5. Do not burn R-410A. This decomposition produces hazardous vapors. Evacuate the area if exposed.

6. Use only cylinders rated DOT4BA/4BW 400.

7. Never ﬁll cylinders over 80% of total capacity.

8. Store cylinders in a cool area, out of direct sunlight.

9. Never heat cylinders above 125°F.

10. Never trap liquid R-410A in manifold sets, gauge lines or cylinders. R-410A expands signiﬁcantly at warmer temperatures. Once a cylinder or line is full of liquid, any further rise in temperature will cause it to burst.

Important Installer Note

For improved start-up performance, wash the indoor coil with a dishwashing detergent.

R410-A Refrigerant Charge

This wall-mount unit was charged at the factory with the quantity of refrigerant listed on the serial plate. AHRI capacity and efﬁciency ratings were determined by testing with this refrigerant charge quantity.

Table 7 shows nominal pressures for the units. The use of pressure gauges should not be necessary as the measurements are available through the TEC-EYE hand-held diagnostic too. Since many installation speciﬁc situations can affect the pressure readings, this information should only be used by certiﬁed technicians as a guide for evaluating proper system performance. They shall not be used to adjust charge. If charge is in doubt, reclaim, evacuate and recharge the wall-mount unit to the serial plate charge.

Manual 2100-671 Page 34 of 44

Page 35

Pressure Service Ports

High and low pressure service ports are installed on all wall-mount units so that the system operating pressures can be observed. Pressures are shown in Table 8.

This unit employs high-ﬂow Coremax valves instead of the typical Schrader type valves.

WARNING! Do NOT use a Schrader valve core removal tool with these valves. Use of such a tool could result in eye injuries or refrigerant burns!

To change a Coremax valve without ﬁrst removing the refrigerant, a special tool is required which can be obtained at www.fastestinc.com/en/SCCA07H. See the replacement parts manual for replacement core part numbers.

TABLE 7

Cooling Pressures

Cooling Air Temperature Entering Outdoor Coil °F

Model Return Air Temp Pressure 75 80 85 90 95 100 105 110 115 120 125

75° DB Low Side 125 126 127 128 129 130 132 133 135 137 137

62° WB High Side 312 334 357 379 403 427 451 476 501 527 553

W120AP

Stage 3

W120AP

Stage 2

W120AP

Stage 1

80° DB Low Side 134 135 136 137 138 139 141 142 144 146 147

67° WB High Side 320 343 366 389 413 438 463 488 514 540 567

85° DB Low Side 139 140 141 142 143 144 146 147 149 151 152

72° WB High Side 331 355 379 403 427 453 479 505 532 559 587

75° DB Low Side 136 137 137 138 140 141 142 144 145 147 148

62° WB High Side 289 308 330 352 374 398 423 448 474 501 528

80° DB Low Side 145 146 147 148 150 151 152 154 155 157 158

67° WB High Side 296 316 338 361 384 408 434 459 486 514 542

85° DB Low Side 150 151 152 153 155 156 157 159 160 162 164

72° WB High Side 306 327 350 374 397 422 449 475 503 532 561

75° DB Low Side 125 127 128 130 131 133 135 136 137 139 141

62° WB High Side 311 332 355 377 402 427 452 479 506 534 563

80° DB Low Side 134 136 137 139 140 142 144 145 147 149 151

67° WB High Side 319 341 364 387 412 438 464 491 519 548 577

85° DB Low Side 139 141 142 144 145 147 149 150 152 154 156

72° WB High Side 330 353 377 401 426 453 480 508 537 567 597

Low side pressure ± 4 PSIG High side pressure ± 10 PSIG

Tables are based upon rated CFM (airﬂow) across the evaporator coil. If there is any doubt as to correct operating charge being in the system, the charge should be removed and system evacuated and recharged to serial plate charge weight.

NOTE: Pressure table based on high speed condenser fan operation. If condensing pressures appear elevated check

condenser fan wiring. See “Condenser Fan Operation” on page 22.

Manual 2100-671 Page 35 of 44

Page 36

MAINTENANCE

Standard Maintenance Procedures

WARNING

Electrical shock hazard.

Disconnect all power supplies before

servicing.

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

CAUTION

Cut hazard.

Wear gloves to avoid contact with sharp edges.

Failure to do so could result in personal

injury.

1. Disable system from LC6000 controller (see latest revision of LC6000 Service Instructions 2100-

669).

2. Turn off AC breakers at wall-mount units.

3. Check inlet sides of condenser and evaporator coils for obstructions/debris—clean if necessary using a quality manufactured coil cleaning product speciﬁc for the evaporator or condenser coil.

•

Condenser coil: For inlet-side cleaning, remove condenser grilles. For outlet-side cleaning, remove condenser fan panel. Unbolt fan from mounting brackets and slide fan outward until lower locking arm drops into position. Pivot fan by lifting fan locking arm. Follow the coil cleaner manufacturer’s directions for necessary safety gear and precautions, as well as for application and use. More than one application may be necessary. Rinse thoroughly.

• Evaporator coil: Open ﬁlter access panels and remove ﬁlters. Apply speciﬁc evaporator cleaner directly to the inlet side of coil, being very careful not to overspray into insulation or surrounding panels and wiring. For outlet-side cleaning, remove supply grille and clean from that direction. Residual cleaner and dissolved debris should drip into the drain pan and leave the unit through the condensate hose. More than one application may be necessary. Rinse thoroughly.

4. Manually spin fan and blower motors to ensure

they turn freely. All motors are permanently lubricated, so no oil is necessary.

5. Inspect free cooling damper actuator and linkage.

6. Install new air ﬁlters.

7. Inspect the control panel of the system.

• Look for insect or rodent activity and remove any nesting materials.

• Manually push contactor closed, observe for movement—contactor points should have minimal discoloration, no spalling or other signs of arcing. Replace if doubtful.

• Check ﬁeld and factory wiring for tightness and look for signs of overheating (discoloration of terminals or wire insulation).

8. Ensure that supply and return registers are not

obstructed, and more importantly, are not recycling the air to one another. Adjust supply louvers if necessary to direct discharge air away from any direct route to the return grille.

Re-assemble wall-mount unit, remembering to

fasten fan to mounting brackets. Turn breakers back on.

10. Enable system to LC6000 controller (see latest

revision of LC6000 Service Instructions 2100-

669).

11. Repeat steps for additional wall-mount units.

Manual 2100-671 Page 36 of 44

Page 37

8301-089 Outdoor Temperature/Humidity Sensor

FIGURE 50

8301-089 Sensor DIP Switches and Terminal Block

TROUBLESHOOTING

Manual 2100-671 Page 37 of 44

Page 38

TABLE 8

8301-089 Sensor: Temperature/Resistance

Temperature Resistance

F C Ω

-25 -31.7 148,452.94

-24 -31.1 143,910.37

-23 -30.6 139,521.46

-22 -30.0 135,280.55

-21 -29.4 131,182.22

-20 -28.9 127,221.25

-19 -28.3 123,392.63

-18 -27.8 119,691.54

-17 -27.2 116,113.37

-16 -26.7 112,653.66

-15 -26.1 109,308.15

-14 -25.6 106,072.72

-13 -25.0 102,943.44

-12 -24.4 99,916.50

-11 -23.9 96,988.26

-10 -23.3 94,155.21

-9 -22.8 91,413.97

-8 -22.2 88,761.30

-7 -21.7 86,194.07

-6 -21.1 83,709.29

-5 -20.6 81,304.06

-4 -20.0 78,975.60

-3 -19.4 76,721.24

-2 -18.9 74,538.41

-1 -18.3 72,424.61

0 -17.8 70,377.48

1 -17.2 68,394.70

2 -16.7 66,474.07

3 -16.1 64,613.46

4 -15.6 62,810.82

5 -15.0 61,064.17

6 -14.4 59,371.62

7 -13.9 57,731.32

8 -13.3 56,141.52

9 -12.8 54,600.50

10 -12.2 53,106.64

11 -11.7 51,658.35

12 -11.1 50,254.11

Temperature Resistance

F C Ω

13 -10.6 48,892.46

14 -10.0 47,571.97

15 -9.4 46,291.29

16 -8.9 45,049.09

17 -8.3 43,844.12

18 -7.8 42,675.14

19 -7.2 41,540.99

20 -6.7 40,440.51

21 -6.1 39,372.62

22 -5.6 38,336.26

23 -5.0 37,330.40

24 -4.4 36,354.06

25 -3.9 35,406.29

26 -3.3 34,486.17

27 -2.8 33,592.81

28 -2.2 32,725.36

29 -1.7 31,883.00

30 -1.1 31,064.92

31 -0.6 30,270.36

32 0.0 29,498.58

33 0.6 28,748.85

34 1.1 28,020.48

35 1.7 27,312.81

36 2.2 26,625.18

37 2.8 25,956.98

38 3.3 25,307.60

39 3.9 24,676.45

40 4.4 24,062.97

41 5.0 23,466.62

42 5.6 22,886.87

43 6.1 22,323.22

44 6.7 21,775.16

45 7.2 21,242.23

46 7.8 20,723.96

47 8.3 20,219.91

48 8.9 19,729.65

49 9.4 19,252.76

50 10.0 18,788.84

Temperature Resistance

F C Ω

51 10.6 18,337.51

52 11.1 17,898.38

53 11.7 17,471.09

54 12.2 17,055.30

55 12.8 16,650.65

56 13.3 16,256.82

57 13.9 15,873.48

58 14.4 15,500.34

59 15.0 15,137.09

60 15.6 14,783.44

61 16.1 14,439.11

62 16.7 14,103.83

63 17.2 13,777.34

64 17.8 13,459.38

65 18.3 13,149.70

66 18.9 12,848.07

67 19.4 12,554.26

68 20.0 12,268.04

69 20.6 11,989.19

70 21.1 11,717.51

71 21.7 11,452.79

72 22.2 11,194.83

73 22.8 10,943.45

74 23.3 10698.45

75 23.9 10,459.65

76 24.4 10,226.90

77 25.0 10,000.00

78 25.6 9778.81

79 26.1 9563.15

80 26.7 9352.89

81 27.2 9147.86

82 27.8 8947.93

83 28.3 8752.95

84 28.9 8562.79

85 29.4 8377.31

86 30.0 8196.39

87 30.6 8019.91

88 31.1 7847.74

Temperature Resistance

F C Ω

89 31.7 7679.76

90 32.2 7515.86

91 32.8 7355.94

92 33.3 7199.88

93 33.9 7047.59

94 34.4 6898.95

95 35.0 6753.88

96 35.6 6612.28

97 36.1 6474.05

98 36.7 6339.11

99 37.2 6207.37

100 37.8 6078.74

101 38.3 5953.15

102 38.9 5830.51

103 39.4 5710.75

104 40.0 5593.78

105 40.6 5479.55

106 41.1 5367.98

107 41.7 5258.99

108 42.2 5152.53

109 42.8 5048.52

110 43.3 4946.91

111 43.9 4847.63

112 44.4 4750.62

113 45.0 4655.83

114 45.6 4563.20

115 46.1 4472.67

116 46.7 4384.19

117 47.2 4297.71

118 47.8 4213.18

119 48.3 4130.55

120 48.9 4049.77

121 49.4 3970.79

122 50.0 3893.58

123 50.6 3818.08

124 51.1 3744.26

125 51.7 3672.07

Manual 2100-671 Page 38 of 44

Page 39

TABLE 9

8301-089 Sensor: Humidity/mA

RH% mA Output

0 4.000 mA

1 4.160 mA

2 4.320 mA

3 4.480 mA

4 4.640 mA

5 4.800 mA

6 4.960 mA

7 5.120 mA

8 5.280 mA

9 5.440 mA

10 5.600 mA

11 5.760 mA

12 5.920 mA

13 6.080 mA

14 6.240 mA

15 6.400 mA

16 6.560 mA

17 6.720 mA

18 6.880 mA

19 7.040 mA

20 7.200 mA

21 7.360 mA

22 7.520 mA

23 7.680 mA

24 7.840 mA

25 8.000 mA

26 8.160 mA

27 8.320 mA

28 8.480 mA

29 8.640 mA

30 8.800 mA

31 8.960 mA

32 9.120 mA

33 9.280 mA

RH% mA Output

34 9.440 mA

35 9.600 mA

36 9.760 mA

37 9.920 mA

38 10.080 mA

39 10.240 mA

40 10.400 mA

41 10.560 mA

42 10.720 mA

43 10.880 mA

44 11.040 mA

45 11.200 mA

46 11.360 mA

47 11.520 mA

48 11.680 mA

49 11.840 mA

50 12.000 mA

51 12.160 mA

52 12.320 mA

53 12.480 mA

54 12.640 mA

55 12.800 mA

56 12.960 mA

57 13.120 mA

58 13.280 mA

59 13.440 mA

60 13.600 mA

61 13.760 mA

62 13.920 mA

63 14.080 mA

64 14.240 mA

65 14.400 mA

66 14.560 mA

67 14.720 mA

RH% mA Output

68 14.880 mA

69 15.040 mA

70 15.200 mA

71 15.360 mA

72 15.520 mA

73 15.680 mA

74 15.840 mA

75 16.000 mA

76 16.160 mA

77 16.320 mA

78 16.480 mA

79 16.640 mA

80 16.800 mA

81 16.960 mA

82 17.120 mA

83 17.280 mA

84 17.440 mA

85 17.600 mA

86 17.760 mA

87 17.920 mA

88 18.080 mA

89 18.240 mA

90 18.400 mA

91 18.560 mA

92 18.720 mA

93 18.880 mA

94 19.040 mA

95 19.200 mA

96 19.360 mA

97 19.520 mA

98 19.680 mA

99 19.840 mA

100 20.000 mA

Manual 2100-671 Page 39 of 44

Page 40

8620-296 Supply Air Sensor/Return Air Sensor/Mixed Air Sensor/Suction Sensor/ Liquid Sensor

TABLE 10

8620-296 Sensor: Temperature/Resistance Curve J

TemperatureºFResistanceΩTemperatureºFResistanceΩTemperatureºFResistanceΩTemperatureºFResistance

-25.0 196871 13.0 56985 53.0 19374 89.0 7507

-24.0 190099 14.0 55284 52.0 18867 90.0 7334

-23.0 183585 15.0 53640 53.0 18375 91.0 7165

-22.0 177318 16.0 52051 54.0 17989 92.0 7000

-21.0 171289 17.0 50514 55.0 17434 93.0 6840

-20.0 165487 18.0 49028 56.0 16984 94.0 6683

-19.0 159904 19.0 47590 57.0 16547 95.0 6531

-18.0 154529 20.0 46200 58.0 16122 96.0 6383

-17.0 149355 21.0 44855 59.0 15710 97.0 6239

-16.0 144374 22.0 43554 60.0 15310 98.0 6098

-15.0 139576 23.0 42295 61.0 14921 99.0 5961

-14.0 134956 24.0 41077 62.0 14544 100.0 5827

-13.0 130506 25.0 39898 63.0 14177 101.0 5697

-12.0 126219 26.0 38757 64.0 13820 102.0 5570

-11.0 122089 27.0 37652 65.0 13474 103.0 5446

-10.0 118108 28.0 36583 66.0 13137 104.0 5326

-9.0 114272 29.0 35548 67.0 12810 105.0 5208

-8.0 110575 30.0 34545 68.0 12492 106.0 5094

-7.0 107010 31.0 33574 69.0 12183 107.0 4982

-6.0 103574 32.0 32634 70.0 11883 108.0 4873

-5.0 100260 33.0 31723 71.0 11591 109.0 4767

-4.0 97064 34.0 30840 72.0 11307 110.0 4663

-3.0 93981 35.0 29986 73.0 11031 111.0 4562

-2.0 91008 36.0 29157 74.0 10762 112.0 4464

-1.0 88139 37.0 28355 75.0 10501 113.0 4367

0.0 85371 38.0 27577 76.0 10247 114.0 4274

1.0 82699 39.0 26823 77.0 10000 115.0 4182

2.0 80121 40.0 26092 78.0 9760 116.0 4093

3.0 77632 41.0 25383 79.0 9526 117.0 4006

4.0 75230 42.0 24696 80.0 9299 118.0 3921

5.0 72910 43.0 24030 81.0 9077 119.0 3838

6.0 70670 44.0 23384 82.0 8862 120.0 3757

7.0 68507 45.0 22758 83.0 8653 121.0 3678

8.0 66418 46.0 22150 84.0 8449 122.0 3601

9.0 64399 47.0 21561 85.0 8250 123.0 3526

10.0 62449 48.0 20989 86.0 8057 124.0 3452

11.0 60565 49.0 20435 87.0 7869

12.0 58745 50.0 19896 88.0 7686

Manual 2100-671 Page 40 of 44

Page 41

8301-057 Blower Status Switch/Dirty Filter Switch

FIGURE 51

8301-057 Air Differential Switch Terminals

Terminals

1 − Normally Closed 2 − Normally Open 3 − Common

NOTE: Contact position is in resting state.

Manual 2100-671 Page 41 of 44

Page 42

Alarm Index

TABLE 11

MEGA-TEC Alarm Index

Index Description

0 Error in the number of retain memory writings

1 Error in retain memory writings

2 Circuit 1 Return Air Temperature Sensor Alarm

3 Circuit 1 High Return Air Temperature Alarm

4 Circuit 2 Return Air Temperature Sensor Alarm

5 Circuit 2 High Return Air Temperature Alarm

6 Circuit 1 Mixed Air Temperature Sensor Alarm

7 Circuit 1 Mixed Air High Temperature

8 Circuit 1 Mixed Air Low Temperature

9 Circuit 2 Mixed Air Temperature Sensor Alarm

10 Circuit 2 Mixed Air High Temperature

11 Circuit 2 Mixed Air Low Temperature

12 Circuit 1 Supply Air Temperature Sensor Alarm

13 Circuit 1 High Supply Air Temperature Alarm

14 Circuit 1 Low Supply Air Temperature Alarm

15 Circuit 2 Supply Air Temperature Sensor Alarm

16 Circuit 2 High Supply Air Temperature Alarm

17 Circuit 2 Low Supply Air Temperature Alarm

18 Outdoor Air Temperature Sensor Alarm

19 Outdoor Air Humidity Sensor Alarm

20 Circuit 1 Dust Sensor Alarm

21 Circuit 1 Dust Sensor High Dust Detection Alarm

22 Circuit 2 Dust Sensor Alarm

23 Circuit 2 Dust Sensor High Dust Detection Alarm

24 Circuit 1 Liquid Line Temp Sensor Alarm

25 Circuit 2 Liquid Line Temp Sensor Alarm

26 Circuit 1 Liquid Line Pressure Sensor Alarm

27 Circuit 2 Liquid Line Pressure Sensor Alarm

28 Circuit 1 Discharge Temp Sensor Alarm

29 Circuit 2 Discharge Temp Sensor Alarm

30 Circuit 1 Discharge Pressure Sensor Alarm

31 Circuit 2 Discharge Pressure Sensor Alarm

32 Circuit 1 Suction Temperature Sensor Alarm

33 Circuit 2 Suction Temperature Sensor Alarm

34 Circuit 1 Suction Pressure Sensor Alarm

35 Circuit 2 Suction Pressure Sensor Alarm

36 Circuit 1 Low Pressure

37 Circuit 2 Low Pressure

38 Circuit 1 High Pressure

39 Circuit 2 High Pressure

40 Circuit 1 Damper Failed to Open

41 Circuit 1 Damper Failed to Close

Index Description

42 Circuit 2 Damper Failed to Close

43 Circuit 2 Damper Failed to Open

44 Circuit 3 Damper Failed to Open

45 Circuit 3 Damper Failed to Close

46 Circuit 4 Damper Failed to Open

47 Circuit 4 Damper Failed to Close

48 Circuit 1 Freeze Temperature Sensor Alarm

49 Circuit 2 Freeze Temperature Sensor Alarm

50 Circuit 1 Freeze Condition

51 Circuit 2 Freeze Condition

52 Circuit 1 Blower Fail Alarm

53 Circuit 2 Blower Fail Alarm

54 Dirty Filter 1 Alarm

55 Dirty Filter 2 Alarm

56 Dirty Filter 3 Alarm

57 Dirty Filter 4 Alarm

58 Circuit 1 Dirty Condenser Coil Alarm

59 Circuit 2 Dirty Condenser Coil Alarm

60 Emergency Ventilation Mode Active

61 Emergency Cooling Mode Active

62 Extreme High Return Temp Alarm (Heat Cutout)

63 Unit Disable/Smoke Detector Alarm

64 Circuit 1 Power Loss Detected

65 Circuit 2 Power Loss Detected

66 Circuit 1 Low SuperHeat

67 Circuit 1 Low Evaporation Pressure

68 Circuit 1 High Evaporation Pressure

69 Circuit 1 High Condenser Temperature

70 Circuit 1 Low Suction Pressure

71 Circuit 1 EEV Motor Error

72 Circuit 1 Self Tuning Error

73 Circuit 1 Emergency Close

74 Circuit 1 High Delta Temperature

75 Circuit 1 High Delta Pressure

76 Circuit 1 Range Error

77 Circuit 1 Service Position Percent

78 Circuit 1 Valve ID

79 Circuit 2 Low SuperHeat

80 Circuit 2 Low Evaporation Pressure

81 Circuit 2 High Evaporation Pressure

82 Circuit 2 High Condenser Temperature

83 Circuit 2 Low Suction Pressure

Manual 2100-671 Page 42 of 44

Page 43

Index Description

84 Circuit 2 EEV Motor Error

85 Circuit 2 Self Tuning Error

86 Circuit 2 Emergency Close

87 Circuit 2 High Delta Temperature

88 Circuit 2 High Delta Pressure

89 Circuit 2 Range Error

90 Circuit 2 Service Position Percent

91 Circuit 2 Valve ID

92 Th-Tune Device Ofﬂine

93 Th-Tune Temperature Probe Alarm

94 Th-Tune Humidity Probe Alarm

95 Th-Tune Clock Board Alarm

96 c.pCOe Ofﬂine

97 Ofﬂine EBM Blower 1

99 Ofﬂine EBM Blower 2

100

101 Ofﬂine EBM Fan 1

102

103 Ofﬂine EBM Fan 2

104

105 Circuit 1 Low Return Air Temperature Alarm

106 Circuit 2 Low Return Air Temperature Alarm

107 Panel Switch

Manual 2100-671 Page 43 of 44

Page 44

Blower Speeds

TABLE 12

Blower Speeds

Mode Nominal

Free Cooling 57 N/A N/A

Cooling Stage 1 42 48.5 32.6

Cooling Stage 2 57 63 43.8

Cooling Stage 3 57 63 43.8

Heating Stage 1 57 N/A N/A

Heating Stage 2 57 N/A N/A

Emergency Vent 100 N/A N/A

Freeze Alarm 80 N/A N/A

High

Sensible

Enhanced

Latent

Manual 2100-671 Page 44 of 44