Trane RTAC Air cooled chiller compressor and its capacity control with oil flow circuit Explained

[Music] foreign Technical Solutions in this video train rtac Chiller helical rotary semi hermetic compressor and it's loading and unloading mechanism with oil flow circuit is explained compressor mechanical internal view with labeling is shown the compressor is a semi-hermetic direct drive rotary type compressor the male rotor is attached to the motor and the female rotor is driven by the male rotor the rotors and motor are supported by bearings there is no physical contact between the rotors and the compressor housing the rotors contact each other at the point where the driving action between the male and female

rotors occurs refrigerant vapor from the evaporator is drawn into the suction opening of the compressor through a suction strainer screen across the motor and into the intake of the compressor rotors the gas is then compressed and discharged through a check valve and into the discharge line locations of the following components shown on the compressor solenoid valves location and related Schrader test ports Shredder unload ports Shredder female piston piston pressure Shredder male piston piston pressure Port oil intermediate oil pressure capacity control is accomplished by means of two unloader valves assembled in the rotor section of the

compressor the female rotor valve is a two position valve and the male valve is a variable position valve compressor load capacity is dictated by the positions of the unloader valves they divert refrigerant gas from the rotors to the compressor suction thus unloading the compressor this varies the compressor capacity to match the load and reduce the kilowatt drawer of the compressor motor the two position female unloader will fully open or fully close a port on the rotor housing for the discharge end of the female rotor this relieves refrigerant gas to suction and unloads the compressor from

60 to 30 CFM the female unloader valve is the first stage of loading after the compressor starts and the last stage of unloading before the compressor shuts down the modulating male unloader valve opens or closes ports in the rotor housing along the side of the male rotor when the mail unloader valve slide toward the discharge the capacity is reduced female unloader step load valve bypass closed mail unloader modulated valve actuated by the oil close some ports in the rotor housing increasing the capacity Master oil valve is located inside the compressor the master oil valve is

a pressure activated valve discharge pressure off the rotors that is developed when the compressor is on causes the valve to open Terminal box X2 is located on top of the compressor and contains the shown components connection oil separator heater compressor heater step load solenoid load and unload solenoid are connected in the X2 panel a description of the terminal X2 connecting all the compressor components to the main control panel by one cable as the oil enter the internal oil filter it passes trough the master oil valve some oil is used for forbearing lubrication and compressor oil

injection and some is used to control the slide piston via the male load unload solenoids oil that is removed from the refrigerant Falls by gravity into the bottom of the oil separator at discharge pressure as the oil leaves the oil separator it passes through the oil cooler then internal to the compressor there is a high efficiency filter to clean the oil before it is delivered to the rotors and bearings once oil is injected into the compressor rotors it mixes with the refrigerant again and is delivered back to the discharge line oil that gets past the

oil separator flows through the condenser sub cooler and expansion valve into the evaporator this oil is collected in the pool of refrigerant that is maintained in the bottom of the evaporator a small amount of oil and refrigerant from this pool is returned through a line that is connected to the compressor Downstream of the motor this oil and refrigerant mixes with the refrigerant Vapor that was drawn out of the evaporator the oil returns solenoid valve is used on manifolded compressor to prevent flow from the return line into the compressor on Startup in single compressor circuit there

is not enough charge in a circuit to flood the compressor in the off cycle thanks for watching please do subscribe us at UA Technical Solutions