![]() ![]() number of revolutions per minute, a switch takes place from star to delta start. When the electric motor has reached its max. At the same time, a non-return valve must be fitted in the discharge line to the condenser preventing the return flow of discharge gas to the compressor. At a current impulse to the solenoid valve the characteristic valve stroke must be heard! Refrigeration Compressor Starting UnloaderĪt a star-delta start of electric motors it is often considered necessary to limit the compression work of the machine at the starting moment in order to reduce the starting torque of the electric motor. Usually, a solenoid valve is used in a by-pass arrangement which in the starting up phase short circuits the discharge side to the suction side of the compressor. ![]() Stop the compressor and check that the solenoid valve works correctly. With the solenoid valve de-energized, the gas ports in the valve plate and cylinder head are open. With the solenoid valve energized, the suction port in the corresponding cylinder head is shut off by means of a servo valve the pistons of this cylinder row run idle without gas pressure. ![]()
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