CS. and CSV. series: ECO pipe layout and ECO pipe sizes
- The compressors CSH65 .. CSH95 and all CSV. compressors have an ECO connection that is active in the entire control range of the capacity control.
- Compressors CSW65 .. CSW105, CSH76 .. CSH96 have an ECO connection that is only active at full load.
For capacity control of screw compressors and ECO operation at part load:
- ST-430: Capacity control of BITZER screw compressors
Pipe sizes
Connection sizes of the ECO suction gas lines/ECO shut-off valves and kit numbers:
- AT-320: Connections and shut-off valves for BITZER compressors
Pipe layout
Risk of damage to the compressor caused by liquid slugging and lack of oil!
Avoid migration of oil or refrigerant into the compressor (wet operation) and oil traps/oil pockets in the system!
- Carefully plan pipe layout and system design.
- Arrange the liquid subcooler / intermediate pressure vessel below the compressor.
- Route the pipeline from the ECO connection first upwards and then in a bend again downwards.
- In systems with high refrigerant charge: Install the suction accumulator upstream of the suction gas connection of the compressor.
- For continuous oil return, always ensure the minimum required gas flow velocity in the system.
1 | External pulsation muffler on the ECO shut-off valve with CSH65 and CSH75 only |
CSH95: The ECO connection is located on the top side of the compressor housing; a swan neck pipe for protection against oil migration is therefore not required. Guide the line from the connection horizontally or downwards.
Risk of pipe fractures and leakages on compressor and system due to vibrations.
Avoid critical pipe lengths and/or install a muffler.
- CSH65, CSH75 and CSV: Solder the ECO suction gas line directly into the pulsation muffler (Pulsation muffler).
- CSH85, CSH95 and CSW65 to CSW95: Solder the ECO suction gas line directly into the ECO shut-off valve.
- In systems with high refrigerant charge: Install the suction accumulator upstream of the suction gas connection of the compressor.
- For continuous oil return, always ensure the minimum required gas flow velocity in the system!
Reduced system efficiency due to ambient heat gains in the liquid line!
Insulate the liquid line between the liquid subcooler and the expansion valve of the evaporator!
Mounting the ECO shut-off valve
CSH85 Description
CSV. series (Description)