As the compressor operates, it draws vapor into the low side until the correct weighed amount of refrigerant is in the system. Low side lines and the evaporator should be cool. Operate the vacuum pump to achieve the recommended gauge pressure. Charging is completed with a full performance test.Charging with a manifold set is accomplished in the same way. Air Comm’s engineering department is staffed by mechanical, electrical, and aerospace specialists with years of experience in aviation systems. Alternately, the amount of oil to be put into the system can be selected on the servicing cart. At this pressure, water boils at 45 °F. The air conditioner controls, drive the bypass valve in the ACM to regulate the temperature of the bleed air entering the cabin. Our customers only comment was that at times there was too much heat. Components include an air cycle machine, heat exchanger, temperature sensor and control valves, and a ventilation blower. After opening the valve on the container (or puncturing the seal on a small can), the center hose connection on the manifold set should be loosened to allow air in the hose to escape. When changing a component, additional oil may need to be added to replace that which is trapped in the replaced unit. Vapor cycle air conditioning systems require Periodic visual inspections, tests, and refrigerant level and oil level checks. Air Comm Corporation designs, certifies, and manufactures high-performance vapor-cycle air conditioning systems for the fixed wing aircraft and helicopter marketplace. [Figure 2]Security and alignment of the compressor is critical and should be checked during inspection. Bubbles present in the sight glass of the receiver dryer while the system is operating indicate more refrigerant is needed. Since the condenser often has ram air ducted to it or extends into the airstream, check for the presence of debris that may restrict airflow. When suspicion exists that the system has been contaminated, such as when a component has catastrophically failed, it can be flushed clean. Approximately 1⁄4 ounce of oil for each pound of refrigerant is a standard amount; however, follow the manufacturer’s specifications.The EPA requires certification of technicians that work with vapor cycle air conditioning refrigerant and equipment to ensure safe compliance with current regulations. An ordinary thermometer should read 40–50 °F, with the controls set to full cold after the system has been allowed to operate for a few minutes. Dirt and inhibited airflow through the fins can prevent effective heat exchange to and from the refrigerant. Anytime the system refrigerant charge falls below atmospheric pressure, the refrigerant is lost, or the system is opened, it must be evacuated before recharging.Evacuating a vapor cycle air conditioning system is also known as pumping down the system. High side pressure is between 125 and 250 psi, again, depending on ambient temperature and the design of the system. Air Comm Corporation designs, certifies, and manufactures high-performance vapor-cycle air conditioning systems for the fixed wing aircraft and helicopter marketplace. About 50 psi of refrigerant in the high and low sides should be sufficient for a leak check.

All system performance tests are performed at a specified engine rpm (stable compressor speed) and involve a period of time to stabilize the operation of the vapor cycle. Since the refrigerant must be captured, a service cart with this capability should be used. Hinged units should be checked for security and wear. To locate the leak point, the system needs to be partially charged with refrigerant so leak detection methods can be employed. The valve position is varied by an electrically powered motor that requires DC power to operate. Typically, 1⁄4 ounce of oil is added for each pound of refrigerant added to the system. The hot bleed air melts the ice and frees the exit of the system, and at the same time the air passing through the heat exchangers and the air cycle machine is less,the speed decreases and the cooling pack delivers hotter air to the Air Conditioning System. The air cycle machine is driven by simulated turbine-engine bleed air. An ACM uses no Freon: the air itself is the refrigerant. Belt-driven compressors need to have proper belt tension to function properly. No action is needed if this amount is within limits.Occasionally, all of the refrigerant escapes from the system. The air conditioning system processes high pressure, high temperature air which is most of the time taken or “bled” from the aircraft engines (engine bleed air system). With the hoses still connected to the high and low side service valves, selecting charge on the service cart panel positions solenoid operated valves so that the refrigerant supply is available. Your heater (Arctic option) performed well, supplying lots of heat with noise levels well below those of the previously installed bleed air heater. Note that vapor cycle systems normally lose a small amount of refrigerant each year. Air Comm Corporation designs, certifies and manufactures high-performance bleed air, resistive, and PTC heater systems for the fixed wing aircraft and helicopter marketplace. On hot, humid days, the cooling output of the vapor cycle system may be slightly compromised due to the volume of water condensing on the evaporator.Purging the system means emptying it of its refrigerant charge.

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