INSTALLATION AND OPERATION INSTRUCTIONS

General Information

The PGDx display kit enables a single MEGA-TEC unit to operate in stand-alone mode, providing unit status, operation, and alarm displays accessible from within the climate-controlled area. The PGDx touch screen features a 4.3" 65K high-quality color touch display and connects via RS485 serial connection to a Modbus PLAN connection. For installations with more than one MEGA-TEC unit, an LC6000 controller is required.

The 8620-308 PGDx display kit includes the PGDx 4.3" touchscreen with built-in temperature/humidity sensors, enclosure, USB memory stick, two (2) EMI filters, instructions, and a 24VDC power supply. A 4-wire, 22-gauge shielded cable (up to 200' length) is recommended for connecting the PGDx to the MEGA-TEC unit, but is not supplied.

NOTE: A PGD display (Bard P/N 8301-053) or TEC-EYE diagnostic tool (Bard P/N 8301-059) is required for commissioning the MEGA-TEC wall unit and is not included with the 8620-308 kit.

IMPORTANT: Disconnect the PGDx before connecting a PGD or TEC-EYE to avoid potential I/O board faults or screen scrambling.

Installation should be performed by factory-trained and certified technicians. Read all instructions carefully and note any attached tags or labels. These instructions are a general guide and do not supersede national or local codes.

Shipping Damage

Upon receipt, inspect cartons for external shipping damage. If damage is found, contact the carrier immediately to request an inspection.

PGDx Touch Display and Accessories

Included in 8620-308 Kit:

• PGDx Touch Display with built-in temperature and humidity sensors (Bard P/N 8620-308)
• USB Memory Stick for software updates (Bard P/N 8611-259)
• EMI Filters (Bard P/N 8301-055)

IMPORTANT: Neither the TEC-EYE Tool nor the PGD Display are included with the 8620-308 kit, but one is required for the MEGA-TEC set-up process.

Required but not included:

• TEC-EYE™ Hand-Held Diagnostic and Commissioning Tool (Bard P/N 8301-059)
• PGD Display for diagnostics and commissioning (Bard P/N 8301-053)

PGDx Enclosure Dimensions

The PGDx enclosure has the following approximate dimensions: Width: 7.874", Height: 4.724", Depth: 2.958". The display area is approximately 5.000" x 2.750".

PGDx Installation

! WARNING: Electrical shock hazard. Disconnect VAC power supplies before servicing. Failure to do so could result in electric shock or death.

IMPORTANT: When working with circuit board components, use an anti-static wrist strap to prevent static electricity shorts.

Mounting the PGD Enclosure

The PGDx display can be mounted using the four provided holes. For custom mounting, the polycarbonate plastic enclosure allows for easy hole drilling. It can also be installed on a 2x4 handi box for conduit applications. An opening must be made in the back of the enclosure for cabling. The kit includes a 24VAC to 24VDC power supply.

[Figure 1: PGDx Enclosure Mounting - Diagram showing enclosure dimensions and mounting hole locations.]

PGDx Connection to MEGA-TEC Unit

Connect the PGDx to the MEGA-TEC unit using a 4-wire, 22-gauge shielded cable (up to 200' max length). If non-shielded cable is used, the maximum length is 6'. A 12" wire harness connects the supplied 24VDC power supply to the PGDx.

For installations in areas with high frequency electronic noise, Bard recommends using the supplied EMI filters (P/N 8301-055) for power and communication wiring. Create a small service loop in the wiring and attach the EMI filter at the intersection of the loop.

[Figure 2: Remove Unit Control Access Panel - Illustration showing the location of the control access panel on the MEGA-TEC unit.]

[Figure 3: MEGA-TEC Power and Communication Terminals - Diagram of the terminal block showing connections for +24VAC, -24VAC, R+/T+, and R-/T-.]

Access the connection terminals for 24VAC power and Modbus communications by removing the control access panel on the front of the MEGA-TEC unit. These terminals are typically located on the right side of a terminal block in the upper right-hand corner of the unit control panel.

Power Wiring Connections: Connect two conductors from the 24VDC power supply to the PGDx enclosure (+24 and -24 terminals). Connect the other ends to MEGA-TEC unit power terminals 5 and 6, matching polarity to the + and - 24VAC PGDx power supply terminals.

Communication Wiring Connections: Connect two conductors to the PGDx communication connector. Connect the other ends to MEGA-TEC unit communication terminals 7 and 8, matching polarity.

After wiring, replace the control access panel.

[Figure 4: Connecting PGDx to MEGA-TEC Unit - Wiring diagram illustrating connections between PGDx, DC power supply, and MEGA-TEC terminals, including EMI filter placement.]

Powering On PGDx

After connecting the power and communication wiring, turn on the unit main disconnect. The Main Screen will display once the PLC controller program and PGDx runtime load.

[Figure 5: PGDx Main Screen - Visual representation of the PGDx main interface showing date/time, unit status, temperature, humidity, setpoints, and navigation icons.]

If communications are not established, a "Communications Lost" message will appear on the PGDx. Verify all connections are correct. If communication is not established within 10 minutes, another system-level message indicating a communication loss will appear.

[Figure 6: Communications Lost Message - Example of a "Communication Lost with Unit PLC" message.]

[Figure 7: Communications Lost Between PLC and PGDx - System message indicating a communication loss.]

Once communications are established, press OK to return to the Main Screen. If the PGDx enable bit is disabled after communications are established, a "PGDx Not Enabled" message will appear.

[Figure 8: PGDx Not Enabled Message - Screen indicating the PGDx is not enabled.]

To enable the PGDx, follow the on-screen prompts and select "Enable PGDx" from the selection box.

[Figure 9: Enable PGDx Selection Box - Interface showing the option to enable or disable the PGDx.]

PGDx Operation

Once installed and powered on, the MEGA-TEC unit is ready for standard heating and cooling operation (heating is optional). The PGDx kit supports Balanced Climate™ and dehumidification features.

Available features and functions include:

• Emergency Cooling (requires economizer)
• Alarm Logging
• Continuous Blower
• High Sensible Mode
• Balanced Climate
• Dehumidification

Using the PGDx Touch Display

Main Screen

The Main Screen provides shortcuts to various functions via icons. Unit Status, Cooling Setpoint, Heating Setpoint, Passive Setpoint, and Active Setpoint are displayed on the left side of the screen. Passive and Active Setpoint status are only shown when dehumidification is enabled and supported by the unit model.

[Figure 10: PGDx Touch Areas - Diagram of the Main Screen highlighting interactive icons for Login/Logout, Date/Time, Alarms, Setpoints, Comfort Mode, Information, Unit On/Off, and Configuration.]

Touch Area Functions:

• Login Screen/Logout: Accesses the login screen for user, service, or manufacturing passwords. Unlocking allows logout.
• Date and Time Screen: Allows changing the date and time, which also updates the wall unit PLC. Requires login.
• Active and Alarm History: Accesses the active alarms screen and alarm history log.
• Heating and Cooling Setpoints: Adjusts the unit's heating and cooling setpoints. Requires login.
• Humidity Screen: Enables and sets dehumidification setpoints (Off, Passive, Active). Requires login.
• Comfort Mode: Enables comfort mode, sets duration, and adjusts comfort mode heating/cooling setpoints.
• Information Screen: Displays unit information such as temperatures, pressures, and humidity across nine screens. No login required.
• Unit On/Off Screen: Turns the unit on or off. Requires login.
• Configuration Screen: Provides access to blower options, indoor sensor offsets, software updates, emergency cooling, unit of measure, and passwords. Requires login.

Login and Logout

Upon initial power-up, a password entry is required to access screens from the Main Screen. This can be done by pressing the padlock icon or any desired screen icon. The heating, cooling, passive, and active setpoints, along with unit status, are for reference only and do not act as shortcuts.

[Figure 11: Login Icon Locked - Visual of the locked padlock icon on the screen.]

Touching a shortcut icon on the Main Screen (unless unlocked) brings up the Login Screen. Use the on-screen keyboard to enter the password.

[Figure 12: Login Screen - Interface for entering the password.]

[Figure 13: Password Screen Keyboard - On-screen keyboard layout.]

After entering the correct 4-digit password, the Main Screen will show the padlock as unlocked, enabling access to menus like Unit On/Off and Configuration.

[Figure 14: Login Icon Unlocked - Visual of the unlocked padlock icon and enabled menu options.]

To log out, return to the Main Screen using the [Home Icon] at the top left. On the Main Screen, touch the padlock icon at the top left, then touch the "Logout" button. The display returns to the Main Screen with the password locked.

The PGDx automatically logs out after 8 minutes of inactivity.

Date and Time Screen

The Date and Time Screen allows setting the local time zone's date and time, which also updates the unit controller.

[Figure 15: Date and Time Screen - Interface for setting the date and time.]

To change the date or time, press the relevant number to bring up the keyboard. After making changes, press the SAVE [Checkmark Icon] in the lower right corner.

[Figure 16: Date and Time Screen Keyboard - Keyboard for entering date and time values.]

Verify changes by returning to the Main Screen via the [Home Icon]. Allow 5 seconds for changes to register.

[Figure 17: Date and Time Displayed on Main Screen - Main screen showing the updated date and time.]

Unit Status

The Main Screen displays the unit's current status. These messages are consistent with those on the PGD/TEC-EYE display and serve for informational purposes only, not as shortcuts.

[Figure 18: Unit Status Displayed on Main Screen - Main screen showing unit status indicators.]

Alarms and History Alarms

The Alarms Screen and History Alarms Screen list current active alarms and provide a historical log.

Active alarms are indicated by a [Bell Icon] in the top right corner of the Main Screen, often with a red circle and count if alarms are present. Pressing the [Bell Icon] navigates to the Alarms Screen.

[Figure 19: Active Alarms Displayed on Main Screen - Main screen showing the alarm indicator.]

Active alarms typically reset automatically once addressed. They can be manually reset via a reset button on the Alarms Screen. Some alarms may require additional actions for reset.

[Figure 20: Resetting Active Alarms - Alarms screen interface with a reset button.]

The History Alarms Screen is accessed via an icon on the Alarms Screen.

[Figure 21: Accessing History Alarms Screen - Icon to navigate to history alarms.]

This screen logs alarm date, time, ID, description, and state. Alarms remain in the log until the buffer is full or the log is reset.

[Figure 22: History Alarms Screen - Display of past alarms with details.]

The alarm history log can be sorted by time (minutes, hours, days, weeks) using a clock icon.

[Figure 23: Sorting Alarms in History Alarms Screen - Interface for sorting alarm history.]

The history log can be reset via a button on the top right. Resetting the history log on the PGDx also clears it on the PGD, but not vice-versa. A confirmation prompt appears before clearing.

[Figure 24: Resetting Alarm History Log - Interface for resetting the alarm history.]

[Figure 25: Clearing Alarm History - Confirmation dialog for clearing alarm history.]

Dehumidification

Dehumidification Setpoints Screen

The PGDx features a built-in temperature/humidity sensor to monitor room conditions. The humidity value is displayed on the Main Screen.

[Figure 26: Built-In Temperature/Humidity Sensor - Image of the PGDx display showing temperature and humidity readings.]

[Figure 27: Humidity Value Displayed on Main Screen - Main screen showing the current humidity percentage.]

Accessing the humidity value on the Main Screen leads to the Dehumidification Setpoints Screen. Login may be required. This screen displays dehumidification setpoints and blower speed. Options may be limited if dehumidification is not installed or the unit model is incorrect.

[Figure 28: Dehumidification Setpoints Screen - Interface for setting dehumidification parameters.]

[Figure 29: Dehumidification Setpoints Screen of Unit Without Dehumidification Option - Example showing limited options.]

The Dehumidification Setpoints Screen allows adjustment of Off, Passive On, and Active On setpoints for humidity control. Pressing a setting value brings up a keyboard for adjustments, showing Min/Max limits.

[Figure 30: Adjusting Dehumidification Setpoint Values - Interface for adjusting setpoints with a keyboard and Min/Max limits.]

Electric Reheat Dehumidification

Units may be equipped with electric reheat dehumidification. This feature is indicated in the Dehumidification Setpoints Screen.

[Figure 31: Dehumidification Setpoints Screen of Unit With Electric Reheat Dehumidification Option - Setpoints screen displaying the Electric Reheat option.]

Enable dehumidification by toggling the "Dehum Enable" toggle. This allows setpoint adjustments and modulates the blower based on demand, using the built-in humidity sensor.

[Figure 32: Enabling Dehumidification on the Dehumidification Setpoints Screen - Interface showing the Dehum Enable toggle.]

During passive dehumidification, the economizer is disabled, and blower speeds may optimize latent capacity. Active dehumidification engages the compressor and electric reheat coil to extend cooling cycle run time while mitigating cooling. The system continues dehumidification until setpoints are met or the demand ceases.

Temperature Setpoints

The Temperature Setpoints Screen allows adjustment of the unit's heating and cooling setpoints. Access it by pressing the temperature value on the Main Screen.

[Figure 33: Temperature Value Displayed on Main Screen - Main screen showing the current temperature reading.]

The Temperature Setpoints Screen displays current cooling and heating setpoint values. Adjust settings by pressing the desired value, which opens a keyboard. Enter values within the Min/Max limits.

[Figure 34: Temperature Setpoints Screen - Interface for setting temperature setpoints.]

[Figure 35: Adjusting Temperature Setpoint Values - Interface for adjusting setpoints with a keyboard.]

If communication is lost, the unit operates in orphan mode using the last communicated setpoints.

Comfort Mode

Access the Comfort Mode Screen via the shortcut on the Main Screen. No login is required.

[Figure 36: Accessing Comfort Mode via Main Screen - Main screen showing the Comfort Mode icon.]

Enable comfort mode by toggling the "Disable/Enable" button. Configure the time duration and adjust comfort mode heating and cooling setpoints using the keyboard. Comfort mode setpoints override standard setpoints.

[Figure 37: Comfort Mode Screen - Interface for enabling and configuring comfort mode.]

When comfort mode is active, the unit runs in cooling above 71°F and heating below 69°F, with a 2°F separation. The Main Screen indicates when comfort mode is active, and setpoints reflect the active mode.

[Figure 38: Main Screen Showing Unit is in Comfort Mode - Main screen indicating active comfort mode.]

Information Screens

Press the [Info Icon] on the Main Screen to access information screens displaying temperatures, pressures, fan, blower, and I/O data. No login is required.

[Figure 39: Accessing Information Screens via Main Screen - Main screen showing the information icon.]

Pressing the information icon displays the first of nine screens.

[Figure 40: Scroll Bar on Information Screen - Example information screen showing a scroll bar indicating more content.]

Information Screen 1: Indoor/Outdoor Temperature displays:

• Return Air Temp
• Outdoor Temp
• Indoor Temp (PGDx Sensor)
• Outdoor Humidity
• Indoor Humidity (PGDx Sensor)

Navigate between screens using the left/right arrows. The [Home Icon] returns to the Main Screen. Information is for display only, except for brightness on screen 9.

[Figure 41: Using Information Screen Arrows and Home Button to Move to Other Screens - Interface showing navigation controls.]

Information Screen 2: Condenser Fan

Displays fan speed percentage and discharge pressures for two refrigeration circuits. Refer to the MEGA-TEC service instructions manual 2100-671 for more details.

[Figure 42: Information Screen 2: Condenser Fan - Interface showing condenser fan speed and discharge pressures.]

Information Screen 3: AC Circuit 1

Displays high pressure status, suction pressure, liquid temperature, evaporator temperature, EEV position, and compressor state status.

NOTE: When the unit model number's 6th character is 'N' (400V), "Compressor 1 Full" is not displayed. 400V units have two single-stage compressors.

[Figure 43: Information Screen 3: AC Circuit 1 - Interface showing AC circuit 1 parameters.]

Information Screen 4: AC Circuit 2

Displays information on compressor 2 status, similar to AC Circuit 1.

[Figure 44: Information Screen 4: AC Circuit 2 - Interface showing AC circuit 2 parameters.]

Information Screen 5: Blower

Displays supply air temperature, blower speed percentage, heating stages, air flow switch, filter switch, and filter indicator.

[Figure 45: Information Screen 5: Blower - Interface showing blower status.]

Information Screen 6: Damper

Displays supply air temp, mixed air temp, outdoor temp, outdoor humidity, damper position, dust sensor, and damper open/closed state.

NOTE: If the unit model number's 10th character is 'B' (economizer setting), "Mixed Air Temp" is not available.

[Figure 46: Information Screen 6: Damper - Interface showing damper status.]

Information Screen 7: General Information

Displays unit disable and damper power status.

[Figure 47: Information Screen 7: General Information - Interface showing general system status.]

Information Screen 8: Unit Information

Displays unit type, software version, operating system version, serial number, and model number.

[Figure 48: Information Screen 8: Unit Information - Interface showing unit identification details.]

Information Screen 9: Display Information

Displays PGDx software version, main OS version, software runtime, and brightness level (0-255). Brightness can be adjusted by pressing the value.

[Figure 49: Information Screen 9: Display Information - Interface showing PGDx display details.]

Configuration Menu

Access the configuration menu by logging in or pressing the configuration menu icon [Menu Icon] on the Main Screen. This leads to the Password Screen.

[Figure 50: Configuration Menu Icon on Main Screen - Main screen showing the configuration menu icon.]

The Configuration Menu provides access to blower options, indoor sensor offsets, software updates, emergency cooling, unit of measure, and password settings.

[Figure 51: Configuration Menu Screen - Main interface of the configuration menu.]

Blower Options Screen

This screen offers three blower operation modes and blower speed settings. Refer to the MEGA-TEC service instructions manual 2100-671 for more details.

• Continuous Blower: Runs the blower continuously. Default is off.
• High Sensible Mode: Increases blower speed for enhanced sensible cooling capacity. Default is off.
• Balanced Climate™: Reduces indoor airflow and extends run time to enhance comfort and extract humidity during cooling. Default is off.

[Figure 52: Continuous Blower - Interface for continuous blower settings.]

[Figure 53: High Sensible Mode - Interface for high sensible mode settings.]

[Figure 54: Balanced Climate - Interface for balanced climate settings.]

Indoor Sensor Offsets Screen

Allows offsetting the PGDx onboard temperature and humidity sensors to troubleshoot unit issues. Raw values are displayed above the offsets. Press an offset value to adjust.

[Figure 55: Indoor Sensor Offsets Screen - Interface for adjusting sensor offsets.]

Software Update Screen

Used to install software updates via a USB memory stick. A USB memory stick (Bard P/N 8611-259) is provided.

Installing a Software Update:

1. Download the update zip file from www.bardhvac.com/software-download/ to a USB memory stick.
2. Remove the PGDx front bezel.
3. Press the configuration menu icon [Menu Icon] on the screen. Login may be required.

[Figure 56: Remove PGDx Front Bezel - Image showing bezel removal.]

[Figure 57: Configuration Menu Icon on Main Screen - Main screen showing the configuration menu icon.]

4. Select "Software Update" from the Configuration Menu Screen.

[Figure 58: Software Update on Configuration Menu Screen - Configuration menu showing the Software Update option.]

5. Follow the on-screen update procedure instructions.

[Figure 59: Software Update Instructions - Step-by-step guide for software update.]

6. Insert the micro USB end of the memory stick into the PGDx. Press the update button [Press To Update Button] which appears with a green USB indicator.

[Figure 60: Insert Micro USB Memory Stick - Image showing USB insertion.]

[Figure 61: Update Button on Software Update Screen - Interface showing the update button.]

If the memory stick is empty or contains the wrong file, a dialogue screen will appear. Confirm the correct file (UpdatePackage.zip) was downloaded. Press Cancel to clear the screen.

[Figure 62: Software Update Dialog Screen - Example of a software update dialog.]

After placing the correct file on the memory stick, re-insert it and press the update button again. The screen will show "Updating HMI..." splash screen.

[Figure 63: Updating HMI Splash Screen - Screen indicating the HMI update process.]

Upon completion, the PGDx restarts, showing an update progress bar.

[Figure 64: Update Completed - Screen indicating the update is finished.]

[Figure 65: Update Progress Bar - Visual of the update progress bar.]

After the PGDx loads, verify the correct runtime software version by navigating to the Display Information screen (Information Screen 9 of 9) and checking the "Software Version". This should match the version on Bard's website (www.bardhvac.com/software-download/).

[Figure 66: Verifying Software Version Installed - Interface showing software version details.]

This completes the software update process.

Emergency Cool Screen

Access the Emergency Cool Screen from the Configuration Menu.

[Figure 67: Emergency Cooling on Configuration Menu Screen - Configuration menu showing the Emergency Cooling option.]

Enable emergency cooling by toggling the "Emergency Cool" selector to "Enable". Adjust the High Temp Alarm Setpoint using the keyboard. Emergency cooling activates when indoor temperature exceeds the high temperature alarm setpoint, bringing on all available cooling options.

[Figure 68: Emergency Cool Screen - Interface for emergency cooling settings.]

The system uses emergency cooling until the indoor temperature drops below the cooling setpoint. This function can be disabled by the end user.

Unit of Measure Screen

Access the Unit of Measure Screen from the Configuration Menu.

[Figure 69: Unit of Measure on Configuration Menu Screen - Configuration menu showing the Unit of Measure option.]

A popup lists available unit of measure variations. Select the desired unit to change it on the PGDx and PGD/TEC-EYE.

[Figure 70: Unit of Measure Popup Screen - Popup showing available unit options.]

Password Screen

Access the Password Screen from the Configuration Menu.

[Figure 71: Password on Configuration Menu Screen - Configuration menu showing the Password option.]

The Password Screen displays the current login password. Logging into the PGDx also logs into the PGD, but not vice-versa. The PGDx automatically logs out after 8 minutes of inactivity.

The password can be changed by pressing on the desired password field and using the keyboard. The new password will be used for subsequent logins.

[Figure 72: Password Screen - Interface for managing user passwords.]