91
compressor. User should use suction pressure as reference and make sure the valve opened when the discharge
pressure is 4
2
/
cm
kg
higher than the suction pressure. This is essential especially in the low condensing
temperature condition.
7.3 Compressor stop
Compressor stop should be executed under regular procedure. The controlling program should unload the
compressor gradually to its minimum capacity and stop the compressor after it reaches the minimum load. Oil line
solenoid and oil pump (if apply) should be closed at the same time when the compressor stops. ECO line should
be closed when the slide valve position is below 50%. Oil/Liquid injection line should be closed 3 to 5 seconds
before the compressor stop. For the first start-up, check and clean the suction strainer and oil filter after the
commissioning is very important to ensure the future operation.
In case of emergency stop, the oil/liquid injection line, oil line, and ECO line should be closed immediately. If
discharge bypass line is designed in the system, it should be opened to balance the pressure differential between
high and low pressure side then close itself for the next running. With the help of suction check valve and
discharge bypass line, the reverse running time can be limited to a few seconds. If the reverse running doesn
’t
stop in about 10 seconds, the leakage at suction check valve and the malfunction of discharge bypass line can be
assumed, User should check them during the stop of compressor. Before starting the compressor next time, user
should correct the problem first then energize all solenoid valves to help the slide valve back to its initial position.
For a short period of non-operation, the oil heater power should be kept on to keep the oil temperature at proper
temperature for the next start up.
For a long period of non-operation or overhauls, the power source for main and oil pump should be cut off. The oil
heater power should be switched off, too. The control panel should be kept power on to resist moisture. All the
stop valves related to the system should be closed. Cooling water supply should be stopped and the cooling water
in the condenser and oil cooler must de drained completely.
Note: Start and stop of compressor should not be repeated more than 4 times per hour.
Summary of Contents for RC2-F Series
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