Quickly diagnosing operational faults prevents costly unscheduled downtime. Problem: High Discharge Temperature Insufficient oil injection flow.
The capacity slide valve moves axially beneath the rotors. When the system requires less capacity, the slide valve opens, allowing a portion of the suction gas to bypass back to the intake before compression begins. This movement is driven by hydraulic oil pressure regulated by external solenoid valves. Variable Volume Ratio (Vi)
Utilizes an internal slide valve to match compressor capacity precisely with system load. howden xrv 127 manual
If an external oil pump is installed, stop it only after the rotors have ceased rotating. Close Valves: Shut all gas and water isolation valves. Long-term Storage:
Oil is the lifeblood of a rotary screw compressor. Unlike reciprocating compressors, oil in the XRV 127 performs three vital functions: When the system requires less capacity, the slide
During maintenance, components like bearings require precise handling. The manual advises heating angular contact bearings to 80∘C80 raised to the composed with power C 90∘C90 raised to the composed with power C
Many XRV models include an adjustable internal volume ratio mechanism. This allows the compressor to match the internal discharge pressure with the system condensing pressure, preventing over-compression or under-compression losses. If an external oil pump is installed, stop
Confirm the capacity control valve is in the fully unloaded position before starting. cap V sub i cap V sub i screw to the desired ratio. Drive Unit Start: Start the motor and monitor all gauges for normal readings.
Features a slide valve that allows for capacity control from 100% down to 10% of nominal load. 2. Technical Specifications and Description
Install a temporary suction strainer for the initial startup period.
If you are performing a major overhaul (replacing vanes or seals), ensure you have a torque wrench and the specific torque specifications for the end covers to avoid warping the housing.