TM 10-6640-239-13 2-8 d. ECU Controls and Indicators.  Figure 2-5 and Table 2-5 list the controls and indicators for the ECU. Table 2-5.  ECU Controls and Indicators Index Number Control or Indicator Function 1 Selector Switch Selects mode of ECU operation. 2 Temperature Control (2) Controls temperature of Mod Lab B. Fault Indicators 3 Hot Motor Controller Illuminates if motor controller overheats. 4 Over/Under Voltage Illuminates if motor controller is operating outside voltage range. 5 Over Current Illuminates if motor controller is operating with too high amp draw. 6 Temperature/Pressure Illuminates if the high pressure cutout, low pressure cutout, coil frost, or thermostatic switch opens. MBPLB-2-5B 1 2 3 4 5 6 TEMPERATURE/ PRESSURE OVER CURRENT OVR/UNDER VOLTAGE HOT MOTOR CONTROLLER FAULTS TEMPERATURE WARM COOL HEAT OFF RESET VENT COLD 1 TEMPERATURE/ PRESSURE OVER CURRENT OVR/UNDER VOLTAGE HOT MOTOR CONTROLLER FAULTS TEMPERATURE WARM COOL HEAT OFF RESET VENT COLD TEMPERATURE/ PRESSURE OVER CURRENT OVR/UNDER VOLTAGE HOT MOTOR CONTROLLER FAULTS TEMPERATURE WARM COOL HEAT OFF RESET VENT COLD TEMPERATURE/ PRESSURE OVER CURRENT OVR/UNDER VOLTAGE HOT MOTOR CONTROLLER FAULTS TEMPERATURE WARM COOL HEAT OFF RESET VENT COLD 2 4 3 NOTE:  IF MORE THAN ONE UNIT IS OPERATING, SETTINGS MUST BE SIMILAR. MODE MODE MODE MODE Figure 2-5.  ECU Controls and Indicators