Bard MEGA-TEC W090A - Page 5

Manual 2100-671C
Page 3 of 59
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 ...........................36
Refrigerant Information ..................................38
General ...................................................................38
Topping Off System Charge .......................................38
Safety Practices ....................................................... 38
Important Installer Note ...........................................38
R410-A Refrigerant Charge ....................................... 38
Pressure Service Ports .............................................. 39
Maintenance .......................................................42
Standard Maintenance Procedures ............................42
Troubleshooting ................................................43
8301-089 Outdoor Temperature/Humidity Sensor .......45
8620-296 Supply Air Sensor/Return Air Sensor/
Mixed Air Sensor/Suction Sensor/Liquid Sensor ..........48
8301-057 Blower Status Switch/Dirty Filter Switch ....... 49
Alarm Index ............................................................50
Modbus Troubleshooting for MEGA-TEC ..............53
I/O Layout ...............................................................57
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 .............................7
Figure 5 MEGA-TEC Refrigeration Circuits .................9
Figure 6 A/C Circuit Measurements ...........................9
Figure 7 Software Version.......................................10
Figure 8 Executing Self Test ...................................11
Figure 9 Restoring Factory Default Settings .............11
Figure 10 Clearing All Alarms ...................................12
Figure 11 Clearing Alarm Logs and Counters .............. 12
Figure 12 Changing Zone .........................................13
Figure 13
Adjusting Return Air Temperature Sensor ...... 13
Figure 14 Cooling (with Economizer) .........................14
Figure 15 Cooling (without Economizer) ....................15
Figure 16 Heating ...................................................15
Figure 17 Overriding EEV Output ..............................15
Figure 18 Electronic Expansion Valve (EEV) and
Service Tool .............................................16
Figure 19 Adjusting Suction Sensor/Transducer
Pressure Values ........................................16
Figure 20 Voltage to Pressure: Suction Pressure
Transducer ...............................................17
Figure 21 Adjusting Suction Temperature Sensor
Values .....................................................17
Figure 22 Adjusting Evaporator Freeze Sensor
Values .....................................................18
Figure 23 Putting Blower Output into Override
Mode ......................................................18
Figure 24 Dirty Filter Switch and Blower Status
Switch.....................................................19
Figure 25 Verifying Differential Airflow Status ............19
Figure 26 Dirty Filter Switch and Filter Indicator
Light .......................................................20
Figure 27 Enabling/Disabling High Sensible or
Balanced Climate Operation ......................21
Figure 28 Enabling Fan Override ..............................22
Figure 29 Adjusting Discharge/Liquid Transducer
Pressure Values ........................................22
Figure 30 Voltage to Pressure: Discharge/Liquid
Pressure Transducer .................................22
Figure 31 Adjusting Discharge/Liquid Temperature
Input.......................................................23
Figure 32
8201-164 Compressor Control Module .........24
Figure 33 Adjusting Compressor Delays .....................26
Figure 34 Damper Override ......................................26
Figure 35 Dust Sensor .............................................27
Figure 36
Adjusting Dust Sensor Alarm Setpoint ...........27
Figure 37 Damper Blade Position .............................28
Figure 38 Damper Switch ........................................28
Figure 39 Outdoor Temperature Sensor .....................29
Figure 40 Outdoor Humidity Sensor ..........................29
Figure 41 Mixed Air Temperature Sensor ...................30
Figure 42 Economizer Setup ....................................30
Figure 43
Economizer Setup – Dry Bulb Control ......... 31
Figure 44
Economizer Setup – TempHum Control ........ 31
Figure 45
Economizer Setup – Enthalpy Control ............ 31
Figure 46 Supply Air Temperature Sensor ..................32
Figure 47 Emergency Cool − Orphan Mode ................33
Figure 48 Adjusting Return Air Alarm Settings ...........33
Figure 49 Electric Reheat Dehumidification ...............34
Figure 50 Dehumidification Control (°F) ....................34
Figure 51 Unit Disable Option ..................................35
Figure 52 Damper Power Output ............................... 35
Figure 53 Override Damper Output ...........................36
Figure 54 Serial/Model Number Configuration ............36
Figure 55 MEGA-TEC Model Nomenclature ................37
Figure 56 Sensors and Peripheral Devices .................43
Figure 57 Supply and Return Air Sensors ..................44
Figure 58 8301-089 Sensor DIP Switches and
Terminal Block .........................................45
Figure 59 8301-057 Air Differential Switch .............49
Figure 60 Disconnect Condenser Fan
Communication Wires ...............................53
Figure 61 Unplug Modbus from Expansion Module .....53
Figure 62 Verify Modbus is Connected to PLC Board ... 53
Figure 63 Verify Blower Is Online ..............................53
Figure 64 Reverse Polarity of Wires from Blower
Motor ......................................................53
Figure 65 DIP Switch Location .................................54
Figure 66 Check DIP Switch Position ........................54
Figure 67 Ventilation Airflow Paths ...........................56
Table 1 Unit Status Messages .................................8
Table 2 Software Versioning Guide .........................10
Table 3
LC6000/TEC-EYE Passwords (Defaults) ......... 10
Table 4 Unit Specific Superheat Setpoints .............18
Table 5 Rated Airflow ...........................................18
Table 6 Indoor Blower Performance .......................19
Table 7 Maximum ESP of Operation:
Electric Heat Only ....................................19
Table 8 Blower Speed Settings ..............................21
Table 9 Condenser Fan Nominal Speed ..................23
Table 10 Economizer Default Settings ...................... 31
Table 11 Cooling Capacity Limitation .......................34
Table 12 W090A* Cooling Pressures ........................ 39
Table 13 W0120A* Cooling Pressures ...................... 40
Table 14 W0150A* Cooling Pressures ...................... 41
Table 15 8301-089 Sensor: Temperature/
Resistance ............................................... 46
Table 16 8301-089 Sensor: Humidity/mA ................ 47
Table 17 8620-296 Sensor: Temperature/
Resistance Curve J ...................................48