Bard MEGA-TEC W090A Service Instructions Manual
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2100-671(C) Mega-Tec PKG A/C Manual 2100-034(F) User’s Guide 2100-705(B) Mega-Tec A/C Install Instructions 2100-479 Leak Test, Evacuation, Charging ...
Bard Manufacturing Company, Inc. Bryan, Ohio 43506 www.bardhvac.com Manual: 2100-671C Supersedes: 2100-671B Date: 1-21-20 SERVICE INSTRUCTIONS MEGA-TEC® Wall-Mount Air Conditioner Models: W090A, W120A, W150A ...
CONTENTS General Information............................................4 Multi-Stage Cooling System.........................................4 Wall-Mount Air Conditioner Units.................................4 General ...................................................................4 Shipping Damage.......................................................4 Additional Publications.............................................. ...
Electric Heating Element.............................33 Thermal Overload........................................33 Electric Heat Operation......................................33 Electric Reheat Dehumidification...............................33 Electric Reheat Dehumidification Operation.........34 Unit Disable Option..................................................35 Serial/Model Number Configuration......................... ...
GENERAL INFORMATION Multi-Stage Cooling System The Bard air conditioning system is composed of MEGA-TEC wall-mounted air conditioners matched with an LC6000 supervisory controller or Bard PGD/ PGDx stand-alone display. If only one wall-mounted air conditioner is being used, it can be matched with either the LC6000 supervisory controller or a stand-alone display. If more than one wall-mount unit is installed, the LC6000 contro ...
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 flange and combustible materials. Failure to do so could result in fire 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 dam ...
FIGURE 2 TEC-EYE Connection to Unit Control Modular Connector for TEC-EYE Hand-Held Diagnostic Tool USING THE TEC-EYETM 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 throu ...
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 Password Change Initialization Logout In addition to the menu structure above, there are also Status and Alarm screens. TEC-EYE Acronyms MAT – Mixed air temperat ...
Message Description Orphan Mode This is the message shown when unit is not connected to the LC or stand-alone display. The unit is not operating when this message is shown but is ready to heat or cool based on the return air temperature. Blower will run continuously in this mode. Standalone Mode This is the message shown when the unit is communicating with stand-alone display. The unit is not operating when this message is sh ...
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 located on the left side of the unit and circuit 2 is on the right side (see Figure 5). Circuit 1 utilizes a 2 stage scroll compressor while circuit 2 uses a single stage compress ...
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/ NOTICE Software Versioning Guide SoftwareName.x.y.z Software Name: The name of the software is the base part number used to identify which product the software ...
To execute a self test: 1. Press MENU key to access 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 Sys Config; press ENTER key. 4. Press UP or DOWN keys to scroll to Self Test A11 screen. 5. Press ENTER key to scroll to Enable parameter (see Figure 8). 6. Press UP or DOWN key to change value to Yes. The self test will begin. FIGURE 9 Resto ...
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 ...
Exporting 7 Day Logs See latest version of Supplemental Instructions manual 7960-826 for information on exporting 7 day I/O logs. Configuration File The controller will automatically save all of the configured parameters to a file that can be accessed by connecting a laptop to the controller with a micro USB cable. This file can be used to copy the setting of one board to another board. The file is located in the main direct ...
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 coo ...
Heating The unit can be equipped with 0, 1 or 2 stages of electric heat (see Figure 16). 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. ...
8 Press ENTER key to scroll to Enable. 9. Press UP or DOWN key to change Off to On. 10. Press ENTER key to save. 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 18) 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 ...
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 (verified by discharge pressure transducer), 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 superh ...
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. 5. Press UP or DOWN keys to scroll to Blower 1. 6. Press ENTER key to scroll to Blower Overrides? (see Figure 23). 7. Press UP ...
