Related Manuals for Bard MEGA-TEC W180B
Summary of Contents for Bard MEGA-TEC W180B
- Page 1 SERVICE INSTRUCTIONS MEGA-TEC ® Wall-Mount Air Conditioner Models: W180B Bard Manufacturing Company, Inc. Manual: 2100-749 Bryan, Ohio 43506 Supersedes: www.bardhvac.com Date: 2-3-21 Page 1 of 68...
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Page 2: Table Of Contents
CONTENTS General Information ............4 Supply Air Temperature Sensor Alarm ....23 Condenser Fan ............. 23 Multi-Stage Cooling System ..........4 Condenser Fan Components ........23 Wall-Mount Air Conditioner Units ........4 Condenser Fan ..........23 General ..............4 Liquid Pressure Sensor ........24 Shipping Damage ............ - Page 3 Maintenance & Troubleshooting ......45 Figure 43 Damper Override .......... 29 Figure 44 Dust Sensor ..........30 Standard Maintenance Procedures ......... 45 Figure 45 Verifying Dust Sample Output Status ..... 30 8301-089 Outdoor Temperature/Humidity Sensor ... 48 Figure 46 Overriding Dust Sample Output ..... 30 8301-089 Sensor Connections.......
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Page 4: General Information
Multi-Stage Cooling System jurisdiction should be consulted before the installation is made. See Additional Publications for information The Bard air conditioning system is composed of on codes and standards. MEGA-TEC wall-mounted air conditioners matched Sizing of systems for proposed installation should be... - Page 5 National Fire Protection Association (NFPA) WARNING Batterymarch Park P. O. Box 9101 Quincy, MA 02269-9901 Telephone: (800) 344-3555 Fax: (617) 984-7057 Electrical shock hazard. ANSI Z535.5 Definitions: Have a properly trained individual perform these tasks. DANGER: Indicate[s] a hazardous situation which, if not avoided, will result in death or serious injury.
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Page 6: Using The Tec-Eye Tm
USING THE TEC-EYE FIGURE 1 TEC-EYE (Bard P/N 8301-059) Display and Interface (Status Screen Shown) UP KEY ALARM KEY MENU KEY ENTER KEY ESCAPE KEY DOWN KEY QUICK MENU ALARM KEY UP KEY Allows viewing of active alarms Steps to next screen in the display menu... -
Page 7: Tec-Eye Acronyms
TABLE 1 OAT – Outdoor air temperature TEC-EYE Menu Structure OAH – Outdoor air humidity Blower – Indoor blower speed Fan – Outdoor fan speed Password Level Menu/Screen Structure Damper – Free cooling Required Main Status Screen Quick Menu The main Status screen is the default start-up screen Setpoints (Orphan Mode None and also the return screen after 5 minutes of no... -
Page 8: Unit Status Messages
TABLE 3 Unit Status Messages Message Description This message will be shown when unit is not connected to the LC or stand-alone display. The unit Orphan Mode is not operating when this message is shown but is ready to heat or cool based on the return air temperature. -
Page 9: Information
5. Press ENTER key to save and scroll to next Both air paths share a single return air temperature parameter. sensor located in the return duct opening, but each air path has its own mixed air temperature sensor and 6. Press ESCAPE key until Main Menu screen is supply air temperature sensor. -
Page 10: 24 Hour Run Time
FIGURE 8 Circuit 1 utilizes a 2 stage scroll compressor while circuit 2 uses a single stage compressor. Both circuits A/C Circuit Measurements are equipped with an electronic expansion valve that is used to control superheat of each circuit. Liquid temperature and pressure are measured to provide a calculated subcooling for each circuit. -
Page 11: Software Versioning Guide
Current software Damper Time: This is the time (in seconds) allowed for versions and installation instructions are both the opening sequence and closing sequence. available on the Bard website at http://www. bardhvac.com/software-download/ Heat/Cool Time: This is the time (in seconds) allowed for cooling sequence and heating sequence. -
Page 12: Reset To Factory Defaults
FIGURE 12 Self Test Off Restoring Factory Default Settings – Initializing... Remove USB Device Opening Economizer Closing Economizer Compressor 1 On Compressor 1 & 2 On C1 Full Load + C2 On Turning Comp. Off..Electric Heat 1 On Electric Heat 1 & 2 On Turning Heat Off... -
Page 13: Operation
6. Press UP or DOWN key to change value to YES; On the standard TEC-EYE included with the LC6000 press ENTER key. controller (Bard P/N 8301-159), alarm conditions are 7. Press ENTER key to scroll to Clear AutoReset enunciated by an audible alarm signal. On the larger... -
Page 14: Exporting 7 Day Logs
Unit addresses working properly. can only be used once per LC6000 regardless This alarm is fixed and cannot be adjusted. of number of zones. Bard also recommends physically labeling each unit for ease in identification. Manual 2100-749... -
Page 15: Temperature Control Operation
There are separate setpoints other unit still operating. Once the first of the Bard and differentials for cooling and heating. Specific to wall-mount units is installed and powered on, it will the cooling differentials, the economizer will always be operate in orphan mode—keeping the climate inside... -
Page 16: Heating
FIGURE 18 Cooling (without Economizer) Compressor 1 Full Capacity Compressor 2 Compressor 1 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 Cooling Deadband Cooling FIGURE 19 Heating Electric Heater 2 Electric Heater 1 58.0°F 58.5°F 59.0°F 59.5°F 60.0°F... -
Page 17: Electronic Expansion Valve (Eev)
Overriding EEV Output Electronic Expansion Valve (EEV) The valve can also be opened or closed using the EEV service tool (Bard Part # 2151-021). This magnetic EEV EEV Components service tool (shown in Figure 23) is used to manually open the EEV. To do this, remove the EEV stator coil (red... -
Page 18: System Pressures
System Pressures Troubleshooting the Suction Pressure Transducer To view system pressure and temperatures during this 0-250 psig process: -5v Nominal, .5 – 4.5v Actual 4v/250 psig = .016 volts per 1 psig 1. From the Status screen, press UP or DOWN key until Quick Menu displays Unit Information icon Example: 125 psig x .016 + .5 volts = 2.5 volts ). -
Page 19: Suction Temperature Sensor Alarm
Indoor Airflow 8. Press UP or DOWN keys to adjust the offset. 9. The update will not take effect until the cursor is Indoor Airflow Components moved out of the Offset parameter. Blower FIGURE 26 The unit is equipped with a blower that is driven by an Adjusting Suction Temperature Sensor Values electronically commutated motor (ECM). -
Page 20: Blower Status Switch
TABLE 6 FIGURE 28 Rated Airflow Dirty Filter Switch and Blower Status Switch Nominal Rated CFM Nominal Rated ESP High W180B 5400 3280 0.35 TABLE 7 Left and Right Dirty Left and Right Blower Indoor Blower Performance Filter Switches Status Switches (W180 Set @ 1.40) (W180 Set @ 0.40) (Inch H... -
Page 21: Blower Status Alarm
Adjustment of dirty filter switch may be necessary to Blower Status Alarm ensure proper operation. See Figure 30 to aid in setting When the blower is on for 45 seconds and no airflow the filter switch to operate at different percentages of is detected by the airflow switch, the compressor filter blockage. -
Page 22: Filter Indicator Light
The threshold of this alarm is adjusted by changing the 8. Press ENTER key to scroll to Filter Light. settings on the switch (see Figure 30). 9. Press UP or DOWN key to change value to On or Off. Filter Indicator Light FIGURE 32 The wall-mount unit is equipped with a 24V indicator Overriding Filter Light Output... -
Page 23: Additional Indoor Airflow Alarms
Additional Indoor Airflow Alarms High Sensible Operation In high sensible operation, the blower speed will be Supply Air Temperature Alarm raised for each stage of cooling to increase the sensible When the supply air temperature sensor value is out of cooling of the equipment. -
Page 24: Liquid Pressure Sensor
6. Press ENTER key to scroll to the Fan Overrides? Troubleshooting the Discharge/Liquid Pressure Transducer 7. Press UP or DOWN keys to change the value from No to Go. The override will begin and the screen 0-650 psig .5 to 4.5v will change to the override screen (see Figure 34). -
Page 25: Outdoor Temperature Sensor
FIGURE 38 7. If an offset needs to be applied, press ENTER key to scroll to Offset. Condenser Fan Liquid/Discharge Pressure Setpoint 8. Press UP or DOWN keys to change the offset to desired value. 9. Press ENTER key to save. 10. -
Page 26: Compressor Control Module (Ccm)
NOTE: If compressor is allowed to run in reverse Test Mode rotation for an extended period of time, the By rapidly rotating the potentiometer (POT) clockwise compressor’s internal protector will trip. (see Figure 39), all timing functions will be removed for testing. -
Page 27: High Pressure Safety Switch
FIGURE 39 8201-169 Compressor Control Module High Pressure Switch Compressor Contactor Output 18-30 VAC Input Alarm Output Y Input from Thermostat Common and High Pressure Switch Troubleshooting Light Delay-on-Break Time Adjustment Potentiometer Jumper Brownout Ignore Time DIP Switches* * Turn on only one switch for that specific ignore time setting. 10 seconds is the maximum brownout ignore time. -
Page 28: Crankcase Heater
Crankcase Heater 5. Press ENTER key to scroll to Min On Time or Min Off Time (see Figure 40). All units covered in this manual are provided with 6. Press UP or DOWN keys to change the value. compressor crankcase heat. 7. -
Page 29: Additional Compressor Alarms
2. Press UP or DOWN keys and ENTER key to enter right intake damper (damper 3) are each powered by a TECHNICIAN password 1313. 44 in-lb actuator. The left exhaust damper (damper 2) and right exhaust damper (damper 4) are powered by a 3. -
Page 30: Dust Sample
The dust sensor can be verified by: 5. Press UP or DOWN keys to scroll to Digital Outputs C2-2. 1. Press MENU key to go to the Main Menu screen. 6. The status is displayed next to Dust Sample (see 2. -
Page 31: Dust Sensor Failure Alarm
Dust Sensor Failure Alarm 6. Press UP or DOWN keys to change to the desired value. When the sensor reads a value that is outside of the acceptable 0 to 100% range, an alarm will be 7. Press ENTER key to save the value. generated indicating the sensor has failed. -
Page 32: Damper Switch
To view damper blade position: Damper Switch 1. Press MENU key to go to the Main Menu screen. The economizer utilizes three magnetic switches (one on each damper blade) to determine if the damper is 2. Press UP or DOWN keys and ENTER key to enter operating correctly. -
Page 33: Outdoor Temperature And Humidity Combination Sensor
Outdoor Temperature and Humidity Combination Sensor 8. Press UP or DOWN keys to change to the desired value. The unit is equipped with a combination outdoor temperature and humidity sensor to monitor 9. Press ENTER key to save the value. outdoor conditions for the economizer operation. -
Page 34: High Mixed Air Temperature Alarm
type on Economizer Setup A2 will automatically change 7. To apply an offset, press ENTER key to scroll to to None. The only exception to this is emergency Offset. ventilation will always attempt to open the dampers. 8. Press UP or DOWN keys to change to the desired This would only apply if a unit has an economizer but value. -
Page 35: Figure 55 Economizer Setup - Dry Bulb Control
FIGURE 55 11. The cursor should now be on Delay parameter. Economizer Setup – Dry Bulb Control 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. -
Page 36: Economizer Operation - Minimum Position
TABLE 11 Economizer Default Settings Mode Consideration Economizer Available for Cooling Economizer Not Available for Cooling When the outdoor air temperature When the outdoor air temperature Temperature is below 70°F is above 75°F When the outdoor humidity is below When the outdoor humidity is above Humidity When the outdoor dew point When the outdoor dew point... -
Page 37: Supply Temperature Sensor Failure Alarm
Supply Temperature Sensor Failure Alarm 4. Press UP or DOWN keys to scroll to Return Air Alarm A5. When the sensor reads a value that is outside of the acceptable -41.0 to 303.0° range, an alarm will be 5. Press ENTER key to scroll to Enable, Lower generated indicating the sensor has failed. -
Page 38: Thermal Overload
at 190°F and resets at 140°F. For N, Q and T voltage 6. The status is displayed next to Elect. Heat 1 and models, the limit opens at 180°F and resets at 130°F. Elect. Heat 2 (see Figure 61). The limit is also equipped with a redundant thermal FIGURE 61 fuse that will open at 240°F. -
Page 39: Electric Reheat Dehumidification Operation
Electric Reheat Dehumidification Operation Unit Disable Option The unit will utilize electric reheat dehumidification The wall-mount unit can be disabled by opening a dry when it receives an active dehumidification call from set of contacts connected to Input DI1 on the PLC the LC6000 supervisory controller. -
Page 40: Serial/Model Number Configuration
10. Press UP or DOWN key to change direction (N/O or 6. Press ENTER key to scroll to Enable Override. N/C), if applicable. 7. Press UP or DOWN key to change from No to Yes. 11. Press ESCAPE key several times to return to Main 8. - Page 41 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.
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Page 42: Figure 69 Mega-Tec Model Nomenclature
FIGURE 69 MEGA-TEC Wall-Mount Unit Model Nomenclature MODEL SERIES NOMINAL TOTAL CAPACITY 180 – 15 Ton 3 Stage Capacity REVISION B – Revision Level CONTROL LOGIC AND CLIMATE OPTIONS P – Programmable Logic Board E – Electric Reheat Dehumidification (Available w/18 kW only) VOLTS &... -
Page 43: Refrigerant Information
Topping Off System Charge the quantity of refrigerant listed on the serial plate. AHRI capacity and efficiency ratings were determined If a leak has occurred in the system, Bard by testing with this refrigerant charge quantity. Manufacturing recommends reclaiming, evacuating... -
Page 44: Pressure Service Ports
Pressure Service Ports WARNING! Do NOT use a Schrader valve core removal tool with these valves. Use of such a tool could result High and low pressure service ports are installed on all in eye injuries or refrigerant burns! wall-mount units so that the system operating pressures To change a Coremax valve without first removing the can be observed. -
Page 45: Maintenance & Troubleshooting
MAINTENANCE & TROUBLESHOOTING Standard Maintenance Procedures • Evaporator coil: Open filter access panels and remove filters. Apply specific evaporator cleaner directly to the inlet side of coil, being WARNING very careful not to overspray into insulation or surrounding panels and wiring. For outlet-side cleaning, remove supply grille and clean from that direction. -
Page 46: Figure 70 Sensors And Peripheral Devices
FIGURE 70 Sensors and Peripheral Devices LOW PRESSURE TRANSDUCER PART # 8406-158 12" PRESSTITE TAPE 5030-008-1200 PART # LL2 LIQUID LINE ST2 SUCTION TEMPERATURE SENSOR TEMP SENSOR PART# 910-2077 PART #910-2076 WRAP WITH 3" PRESSTITE TAPE, PART #5030-008-0300 4" PRESSTITE TAPE PART #5030-008-0400 HIGH PRESSURE TRANSDUCER... -
Page 47: Figure 71 Supply And Return Air Sensors
FIGURE 71 Supply and Return Air Sensors Supply Air Sensors Return Air Sensor Manual 2100-749 Page 47 of 68... -
Page 48: 8301-089 Outdoor Temperature/Humidity Sensor
8301-089 Outdoor Temperature/Humidity Sensor 8301-089 Sensor Connections to the main unit wiring harness. See Figures 72 and 73 This unit utilizes a two-wire 4-10mA signal from the 8301-089 sensor to communicate outdoor for sensor wiring and terminal location. humidity and a 10KΩ Type III (AN) thermocouple Tables 13 and 14 on pages 50 and 52 are correlation from the 8301-089 sensor to communicate outdoor charts for troubleshooting the sensor with a test meter:... -
Page 49: 8301-089 Outdoor Temperature Sensor Troubleshooting
8301-089 Outdoor Temperature Sensor Troubleshooting To verify sensor operation: 4. Using an ohmmeter or resistance mode on a multimeter, measure resistance across white leads 1. Remove lid from outdoor temperature/humidity leading to the temperature sensor (see Figure 74). sensor. 5. Cross reference readings with Table 13 on page 50. 2. -
Page 50: Table 14 8301-089 Sensor: Temperature/Resistance
TABLE 13 8301-089 Sensor: Temperature/Resistance Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance Ω Ω Ω Ω -31.7 148,452.94 -10.6 48,892.46 10.6 18,337.51 31.7 7679.76 -31.1 143,910.37 -10.0 47,571.97 11.1 17,898.38 32.2 7515.86 -30.6 139,521.46 -9.4 46,291.29 11.7 17,471.09 32.8 7355.94 -30.0 135,280.55 -8.9... -
Page 51: 8301-089 Humidity Sensor Test Value Outputs
8301-089 Humidity Sensor Test Value Outputs FIGURE 75 8301-089 DIP Switch/Output Configuration This sensor has the ability to output fixed test signals when testing/troubleshooting sensor operation. These settings are to be used for sensor testing/ troubleshooting only and need to be removed before unit can resume normal operation. -
Page 52: Table 15 8301-089 Sensor: Humidity/Ma
TABLE 14 8301-089 Sensor: Humidity/mA mA Output mA Output mA Output 4.000 mA 9.440 mA 14.880 mA 4.160 mA 9.600 mA 15.040 mA 4.320 mA 9.760 mA 15.200 mA 4.480 mA 9.920 mA 15.360 mA 4.640 mA 10.080 mA 15.520 mA 4.800 mA 10.240 mA 15.680 mA... -
Page 53: 8620-296 Supply Air Sensor/Return Air Sensor/Mixed Air Sensor/Suction Sensor/Liquid Sensor/Freeze Sensor
8620-296 Supply Air Sensor/Return Air Sensor/Mixed Air Sensor/ Suction Sensor/Liquid Sensor/Freeze Sensor TABLE 15 8620-296 Sensor: Temperature/Resistance Curve J Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance ºF Ω ºF Ω ºF Ω ºF Ω -25.0 196871 13.0 56985 53.0 19374 89.0 7507... -
Page 54: 8301-057 Blower Status Switch/Dirty Filter Switch
8301-057 Blower Status Switch/Dirty Filter Switch FIGURE 77 8301-057 Air Differential Switch Terminals 1 − Normally Closed 2 − Normally Open 3 − Common NOTE: Contact position is in resting state. W180 Switch Settings Left and Right 0.40 Blower Status Switches Left and Right 1.40 Dirty Filter Switches... -
Page 55: Compressor Solenoid
Compressor Solenoid A nominal 24-volt direct current coil activates the FIGURE 78 internal compressor solenoid. The input control Compressor Solenoid Location circuit voltage must be 18 to 28 VAC. The coil power requirement is 20 VAC. The external electrical Solenoid connection is made with a molded plug assembly. -
Page 56: 8612-064 Dust (Particulate) Sensor Control Board
8612-064 Dust (Particulate) Sensor Control Board 8612-064 Control Board Output Signal Not Responsive 1. With a voltmeter, verify 24VAC present across 24VAC pin terminals. A. If 24VAC is not present, trace back wires to source. 2. Inspect and re-seat the dust sensor communication cable. -
Page 57: 8301-091 Dust (Particulate) Sensor
8301-091 Dust (Particulate) Sensor The following measurements are taken across V+ and GND on Dust Sensor Alarm TABLE 17 8301-091 Sensor: Dust/Volts Dust Signal Dust Signal Dust Signal µg/m3 µg/m3 µg/m3 0.10 1.77 3.43 0.15 1.82 3.48 0.20 1.86 3.53 0.25 1.91 3.58... -
Page 58: Variable Speed Blower/Condensate Fan
Variable Speed Blower/Condenser Fan FIGURE 80 Fan Terminals WARNING Electrical shock hazard. Live terminals and connections even when device is turned off. Wait 5 minutes after power has been removed from unit before disconnecting the voltage to the blower/fan motor as internal buss voltage may still be present. -
Page 59: Led Warning/Status Codes
TABLE 18 Blower/Condenser Fan Troubleshooting Possible Issue Possible Remedy Cause Impeller/fan not Imbalance in Clean the device (make sure weight clips are not removed during cleaning); running smoothly rotating parts replace if imbalance persists after cleaning. Motor not Mechanical Switch off unit, isolate from power supply and remove blockage. turning blockage Check line voltage, restore power supply. -
Page 60: Modbus Troubleshooting
Modbus Troubleshooting • For the blower(s) and condenser fan(s): The clear/ white wire should land on the RSA terminal and Use the following instructions if alarm 96, 97, 99, the black wire should land on the RSB terminal 101 or 103 occurs (see Alarm Index on page 63). (See Figure 83). -
Page 61: Figure 84 Communication Wires In Terminal Block
FIGURE 84 2. Verify the correct DIP switch settings on the Communication Wires in Terminal Block c.pCOe (see Figure 86). FIGURE 86 Correct DIP Switch Settings 3. If problem persists, verify 24VAC power to c.pCOe, disconnect communication plug from c.pCOe and disconnect wires from terminal block. -
Page 62: Figure 88 Tec-Eye Condenser Fan 1 Screen
2. If the blower remains offline, the blower must be removed for wiring verification and/or replacement. A. Remove blower terminal access cover. B. Verify high voltage to blower on terminals L1, L2 and L3 with a volt meter. C. If incorrect or no voltage to blower, fix the wiring issue and verify communication. -
Page 63: Alarm Index
Index Alarm Reference (to Manual Section Unless Otherwise Noted) Error in the number of retain memory writings Call Bard Technical Service Error in retain memory writings Call Bard Technical Service Circuit 1 Return Air Temperature Sensor Alarm See Temperature Control section... - Page 64 Index Description Reference (to Manual Section Unless Otherwise Noted) Circuit 1 Suction Pressure Sensor Alarm See Electronic Expansion Valve (EEV) section Circuit 2 Suction Pressure Sensor Alarm See Electronic Expansion Valve (EEV) section Circuit 1 Low Pressure See Compressor section Circuit 2 Low Pressure See Compressor section Circuit 1 High Pressure...
- Page 65 Index Description Reference (to Manual Section Unless Otherwise Noted) Circuit 1 High Delta Temperature See Electronic Expansion Valve (EEV) section Circuit 1 High Delta Pressure See Electronic Expansion Valve (EEV) section Circuit 1 Range Error See Electronic Expansion Valve (EEV) section Circuit 1 Service Position Percent See Electronic Expansion Valve (EEV) section Circuit 1 Valve ID...
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Page 66: Figure 89 Ventilation Airflow Paths
FIGURE 89 Ventilation Airflow Paths 100% CLOSED LOOP SUPPLY AIR SIDE FRONT VIEW VIEW RETURN AIR CONDENSER EXHAUST CONDENSER CONDENSER MIXED AIRFLOW SUPPLY AIR SIDE FRONT VIEW VIEW FRESH FRESH RETURN AIR EXHAUST AIR CONDENSER EXHAUST CONDENSER CONDENSER 100% OUTSIDE SUPPLY AIR SIDE FRONT... -
Page 67: I/O Layout
I/O Layout FIGURE 90 I/O Layout Manual 2100-749 Page 67 of 68... -
Page 68: Figure 91 I/O Layout
FIGURE 91 I/O Layout Manual 2100-749 Page 68 of 68...
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