Bard MEGA-TEC W120AP, Service Instructions Manual

Page: 3 / 44

Manual 2100-671
Page 3 of 44
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
Supply Temperature Sensor Failure Alarm ......... 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
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 8201-164 Compressor Control Module ......22
Figure 31 Adjusting Compressor Delays .................24
Figure 32 Damper Override ..................................24
Figure 33 Dust Sensor .........................................25
Figure 34 Adjusting Dust Sensor Alarm Setpoint .......25
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 Economizer Setup – Dry Bulb Control ...... 29
Figure 42 Economizer Setup – TempHum Control .... 29
Figure 43 Economizer Setup – Enthalpy Control ........29
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 LC6000/TEC-EYE Passwords (Defaults) ....... 9
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