User manual CARRIER 30EQAUT

[. . . ] 1-4 1. 3. 10 Condenser Pressure Control Switch (HP2) . 1-4 1. 4. 1 Thermostatic Expansion Valve . 1-4 1. 4. 2 Compressor Pressure Regulating Valve (CPR) (115V Only) . 1-4 1. 4. 3 Defrost Termination Thermostat (DTT) . [. . . ] below) THEN THEN OR NOTE If no buttons are depressed within 5 seconds of pressing the ON key or modifying parameters, the Cab Command reverts to box temperature display and the configuration procedure is aborted. The minimum setpoint parameter is displayed. The minimum setpoint can be selected by scrolling through available options [--20°F (--28. 9°C), --4°F (--20°C), 32°F (0°C)] using the (+) or (--) keys. Selection MUST be validated by pressing the SET key. The null mode differential temperature is displayed next. This setting determines the temperature difference between box temperature and setpoint that controls compressor cycling. The differential can be selected by scrolling through available options [1. 8°F (1°C), 3. 6°F (2°C), or 5. 4°F (3°C)] using the (+) or (--) keys. Selection MUST be validated by pressing the SET key. The ON/OFF (Continuous airflow) parameter for the evaporator fan is displayed next. This feature determines whether the evaporator fan is on or off when the unit cycles off upon reaching setpoint. Change setting by using the (+) or (--) keys. Change setting by using the (+) or (--) keys. Selection MUST be validated by pressing the SET key. The 2ET or 3ET parameter is now displayed. This feature determines heating mode operation based on the presence of a condenser pressure control valve. Since all 30S units covered by this manual have a condenser pressure control valve installed, 3ET must be selected. This enables cooling, null, and heating modes of operation. Selection MUST be validated by pressing the SET key. Change setting by using the (+) or (--) keys. Selection MUST be validated by pressing the SET key. NOTE If no buttons are depressed within 5 seconds of pressing the Defrost and On Keys (Step 2 of the above procedure) or modifying parameters, the Cab Command reverts to box temperature display and the configuration procedure is aborted. The defrost interval parameter is displayed. This setting determines the time between defrosts in hours. [. . . ] The following general safety notices supplement the specific warnings and cautions appearing elsewhere in this manual. They are recommended precautions that must be understood and applied during operation and maintenance of the equipment covered herein. WARNING Beware of unannounced starting of the unit. The unit may cycle the fans and operating compressor unexpectedly as control requirements dictate. Press OFF key on the cab command and disconnect power plug. WARNING Under no circumstances should ether or any other starting aids be used to start engine. WARNING Under no circumstances should anyone attempt to repair the microprocessor module or Cab Command! [. . . ]