A heating, ventilation and air conditioning (HVAC) system comprising: a condenser flowing a flow of refrigerant therethrough; a falling film evaporator in flow communication with the condenser including: a plurality of evaporator tubes through which a volume of thermal energy transfer medium is flowed; a distribution system to distribute a flow of liquid refrigerant over the plurality of evaporator tubes; a refrigerant pool and a primary feed conduit to deliver a flow of refrigerant to the evaporator; at least one secondary feed conduit in flow communication with the primary feed conduit; at least one auxiliary valve disposed at the secondary feed conduit to regulate flow into the evaporator from the primary feed conduit; and at least one sensor being a level meter to sense a level of refrigerant in the refrigerant pool in the evaporator, the at least one sensor operably connected to the at least one auxiliary valve to control operation thereof, characterized in that the heating, ventilation and air conditioning (HVAC) system further comprises: a self-regulating flow control device disposed at the primary feed conduit, wherein the self-regulating flow control device is an expansion valve being one of an electronic expansion valve, thermostatic expansion valve or capillary tube, wherein the secondary feed conduit is arranged in parallel relationship with the primary feed conduit, and wherein the secondary feed conduit branches from the primary feed conduit upstream of the expansion valve, and reconnects to the primary feed conduit downstream of the expansion valve. a condenser flowing a flow of refrigerant therethrough; a falling film evaporator in flow communication with the condenser including: a plurality of evaporator tubes through which a volume of thermal energy transfer medium is flowed; a distribution system to distribute a flow of liquid refrigerant over the plurality of evaporator tubes; a refrigerant pool and a primary feed conduit to deliver a flow of refrigerant to the evaporator; at least one secondary feed conduit in flow communication with the primary feed conduit; at least one auxiliary valve disposed at the secondary feed conduit to regulate flow into the evaporator from the primary feed conduit; and at least one sensor being a level meter to sense a level of refrigerant in the refrigerant pool in the evaporator, the at least one sensor operably connected to the at least one auxiliary valve to control operation thereof, characterized in that the heating, ventilation and air conditioning (HVAC) system further comprises: a self-regulating flow control device disposed at the primary feed conduit, wherein the self-regulating flow control device is an expansion valve being one of an electronic expansion valve, thermostatic expansion valve or capillary tube, wherein the secondary feed conduit is arranged in parallel relationship with the primary feed conduit, and wherein the secondary feed conduit branches from the primary feed conduit upstream of the expansion valve, and reconnects to the primary feed conduit downstream of the expansion valve. a plurality of evaporator tubes through which a volume of thermal energy transfer medium is flowed; a distribution system to distribute a flow of liquid refrigerant over the plurality of evaporator tubes; a refrigerant pool and a primary feed conduit to deliver a flow of refrigerant to the evaporator; at least one secondary feed conduit in flow communication with the primary feed conduit; at least one auxiliary valve disposed at the secondary feed conduit to regulate flow into the evaporator from the primary feed conduit; and at least one sensor being a level meter to sense a level of refrigerant in the refrigerant pool in the evaporator, the at least one sensor operably connected to the at least one auxiliary valve to control operation thereof, characterized in that the heating, ventilation and air conditioning (HVAC) system further comprises: a self-regulating flow control device disposed at the primary feed conduit, wherein the self-regulating flow control device is an expansion valve being one of an electronic expansion valve, thermostatic expansion valve or capillary tube, wherein the secondary feed conduit is arranged in parallel relationship with the primary feed conduit, and wherein the secondary feed conduit branches from the primary feed conduit upstream of the expansion valve, and reconnects to the primary feed conduit downstream of the expansion valve. a self-regulating flow control device disposed at the primary feed conduit, wherein the self-regulating flow control device is an expansion valve being one of an electronic expansion valve, thermostatic expansion valve or capillary tube, wherein the secondary feed conduit is arranged in parallel relationship with the primary feed conduit, and wherein the secondary feed conduit branches from the primary feed conduit upstream of the expansion valve, and reconnects to the primary feed conduit downstream of the expansion valve.