Abstract: An air conditioning system for an operator cab of machine includes a condenser, an evaporator, a compressor and a controller operable to control an operation of the compressor. The controller maintains a pre-defined compressor run time when the compressor is in an ON state. The controller is configured to determine a temperature of the evaporator and compare it with at least one of a first lower threshold temperature value and a second lower threshold temperature value being less than the first lower threshold temperature value. The controller outputs a compressor control command signal to change the operational state of the compressor to an OFF state when the determined temperature of the evaporator is less than at least one of the first lower threshold temperature value for a first time period, and the second lower threshold temperature value for a second time period being less than the first time period.

Abstract: A flow measurement unit for measuring a rate of airflow for a ventilation system. The flow measurement unit includes a flow measurement device installed in a housing. A first and a second pressure gauge are provided anteriorly and posteriorly, respectively, to the flow measurement device. The first and the second pressure gauge are configured to provide a first pressure reading, corresponding to the first pressure, and a second pressure reading, corresponding to the second pressure of airflow. Further, the flow measurement unit includes a fan to adjust airflow, such that the second pressure approaches the first pressure of airflow.

Abstract: A flow measurement unit for measuring a rate of airflow for a ventilation system. The flow measurement unit includes a flow measurement device installed in a housing. A first and a second pressure gauge are provided anteriorly and posteriorly, respectively, to the flow measurement device. The first and the second pressure gauge are configured to provide a first pressure reading, corresponding to the first pressure, and a second pressure reading, corresponding to the second pressure of airflow. Further, the flow measurement unit includes a fan to adjust airflow, such that the second pressure approaches the first pressure of airflow.