Any time the system is purged, it is an opportunity to check the oil quantity in the compressor crankcase. 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. We do this, all at the lowest possible cost. Air-cycle machines Be vigilant for any damage, misalignment, or visual signs of leakage. 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. It’s then ducted into the cabin through louvers, vents, and the eyeball gaspers above your seat. [Figure 1]Be sure the capillary temperature feedback sensor to the expansion valve is securely attached to the evaporator outlet. Air Commâs engineering department is staffed by mechanical, electrical, and aerospace specialists with years of experience in aviation systems. Given an average daytime OATof 37-42° C (99-108°F) with humidity seldom below 80%, we were pleased with your air conditioner and had no complaints from any of the people to whom we demonstrated the aircraft. From there it is plumbed into air conditioning units for cooling. Low side lines and the evaporator should be cool.
This is often done by removing a filler plug and using a dip stick. First, refrigerant is released into the high side of the system. Refrigerant premixed with oil is available and may be permissible for use. Occasionally, these units can be washed. We have just completed a tour through the Arabian Gulf in a Bell 407 demonstrator installed with your air conditioner. The manifold center hose is connected to the refrigerant source that charges the system. At this pressure, water boils at 45 °F. Condensers may also have a fan to pull air over them during ground operation. High side pressure is between 125 and 250 psi, again, depending on ambient temperature and the design of the system. Follow the aircraft manufacturer’s instructions.The compressor is a sealed unit in the vapor cycle system that is lubricated with oil. Each fitting and connection should be inspected visually and with a leak detector.When a vapor cycle air conditioning system loses all of its refrigerant charge, air may enter the system.
After the initial release of refrigerant into the high side, the high side service valve is closed and the remaining charge is made through the low side service valve. This capability enables Air Comm to design its systems unobtrusively in a virtual environment based on aircraft space envelopes, without grounding the helicopter for long periods during developmental programs. ACC value is defined as high quality, durable products that provide reliable, efficient, effective performance under all operating conditions, light weight and low maintenance. If any discrepancies exist, further investigation is needed. Sometimes systems low on refrigerant can cause ice on the evaporator, as can a faulty expansion valve or feedback control line. Periodic visual inspections, tests, and refrigerant level and oil level checks may be all that is required for some time. It should be checked to ensure it functions correctly. ACC value is defined as high quality, durable products that provide reliable, efficient, effective performance under all operating conditions, light weight and low maintenance. The Refrigeration Cycle - How an Air Conditioner Works. The aircraft manufacturer’s maintenance manual specifies this amount and the amount and type of oil to be put into the system when filling. Bubbles present in the sight glass of the receiver dryer while the system is operating indicate more refrigerant is needed. "Air Comm strives ceaselessly to design and produce products that Vapor cycle air conditioning systems require Periodic visual inspections, tests, and refrigerant level and oil level checks. AIR CYCLE AIR-CONDITIONING SYSTEMS Learning Objective: Recognize the operating principles and components of air cycle air-conditioning systems (ACS). Our total focus is to provide our customers products and support that enhance their aircraft.We know flying is your business and we are here for you every step of the way. Vapor cycle air conditioning systems can give many hours of reliable, maintenance-free service. The above diagram depicts a simple air conditioner. Operate the vacuum pump to achieve the recommended gauge pressure. 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.