Discharge gas line

For a good oil supply and a high efficiency of the oil separator, a closely stepped or stepless pressure control in the discharge gas line downstream of the compressor is necessary. Rapid pressure reduction can lead to strong oil foam formation, oil migration and shutdown by oil monitoring. If the pressure in the discharge gas line is too low or is built up with a delay, this can also lead to insufficient oil supply and thus to safety cut-outs. Additional pressure regulators in the discharge gas line downstream of the oil separator or an oil pump may be necessary for the following applications, among others:

• Extreme part load and/or longer shut-off periods with outdoor installation of the condenser and low ambient temperatures
• High suction-side starting pressures with low heat transfer medium temperatures on the high pressure side (critical starting conditions) – alternative here: Suction pressure regulator for rapid reduction of the suction pressure
• Systems with reverse cycling and hot gas defrosting
• Booster application (low pressure difference)