The purpose of this manual is to describe:. Dangers resulting from failure to comply with safety precautions when operating the equipment and performing maintenance tasks. How to start, operate and stop the equipment safely. How to act when problems occur during operation. Parts Supply for IR Europe - Sabroe Spare parts manual - SAB 120 and SAB 151 A-Frame 008504 en 2019.12 5/42 Spare parts liste SAB 120, 151 A-frame Abbreviations in this manual include: Ang. Angle OD= outside diameter equal to Ass. Cooling medium refrigerant Cp. Compressor Reg regulating DN (+space).

Description of SAB 202

The SAB 202 compressor is a capacity adjustable screw compressor with oil injection.
The two rotors are equipped with 4 lobes (male rotor) and 6 lobes (female rotor), respectively, executed with asymmetric profile according to SRM licence.
As indicated on the spare parts drawing at the end of this manual, the rotors at the suction end are fitted with slide bearings, whereas the bearing at the discharge end consists of a combined bearing set with slide bearings, absorbing the radial load, and ball bearings, absorbing the axial forces. The axial forces are partly relieved by means of the rotating balance pistons mounted on the rotors. The rotors are designed for both male drive and female drive. The driving rotor is fitted with a shaft.

The compressor is fitted with a large built-in suction filter, which effectively prevents dirt particles from the refrigeration plant from being led with the suction gas into the compressor. The suction filter housing also has a built-in compressor protection valve which - controlled by a pilot valve - safeguards the compressor against any unwanted high compression pressures. For efficient filtration of the oil that lubricates the bearings in the compressor, an oil filter cartridge has been inserted in the compressor block.

Furthermore, the compressor contains a built-in non-return valve, preventing the compressor from running backwards whenever the power to the driving motor is disconnected. The driving shaft is fitted with a shaft seal of the slide ring type, consisting of a fixed cast iron ring with an O-ring sealing against the shaft seal cover and a rotating springloaded carbon ring with O-ring sealing against the shaft. It is possible to regulate the compressor capacity steplessly from approx. 10% to 100% by means of a regulating slide mounted under the rotors. Once the slide has moved away from the slide stop a gap is created so that some of the sucked-in gas is returned to the suction side. The bigger the gap, the lower the compressor capacity. The regulating slide is moved hydraulically by a regulating piston and controlled by a solenoid valve system. The compressor also features a regulating system by which the built-in Vi volume ratio can be adjusted. The result hereof is that the compressor works optimally at varying operational pressures in the plant. Minecraft barbed wire mod.

To optimize the compressor volume ratio the position of the Vi regulating slide must be changed whenever the compressor works at max. capacity. This is done by changing the position of the slide stop. At partial load the Vi volume ratio will only be approaching the optimum.
Regulating the built-in Vi volume ratio can be done in the following two ways, depending on the compressor type
Manual regulation of the Vi slide:

• By turning the spindle, pos. 180, in accordance with the curves in the instruction manual.

• By means of the oil pressure and two solenoid valves, controlled by a UNISAB II control system.

Schemes

Spare parts for compressor SAB 202

SABROE SAB Screw Compressor Units - Johnson Controls