The screw refrigeration compressor units using method
The screw refrigeration compressor units using method
1．Use condition
condensing temperature：≤43℃
evaporating temperature：-40～+5℃
exhaust gas temperature：≤105℃
oil injection temperature：25～65℃
injection oil pressure：Above the exhaust pressure 0.15～0.3MPa
2、The composition of the refrigeration compressor unit
Units include：Bitzer screw refrigeration compressor、gas path system、Oil line system、and control system,these devices (in addition to start the ark) in the same public base, constitute a unit.
Gas path system include：suction line valve、the suction strainer、breather check valve、exhaust non-return valve、discharge line valve, etc。
Oil line system include：Efficient oil separator（The purpose of the electric heater is heated the oil when the oil temperature is low, when no oil in the oil separator can't give electric heater, otherwise it will damage the heater.Shall ensure that during the operation of the relief valve before the cut-off valve is fully open.）、oil cooler（In winter under the condition of low temperature, such as stop using freezer, should be released water side of water, in case of freezing damage）、Crude oil filter、oil pump、Refined oil filter（Filter should be replaced periodically, change of work shall be carried out during downtime）、constant pressure value（The valve has been adjusted the Settings before they leave the factory, such as in use process need to be set should be a professional operation）、Back to the oil filter, etc。
Control system include: start the ark, the console.
3、For the first time boot
Manual control unit start the program.
After the preparation work well, can follow the steps to drive：
（1）After the preparation work well, can follow the steps to drive；
（2）Slide valve pointer on the "0" position (about 10% of the actual load)；
（3）Freon unit according to the electric heating buttons, lights, heating oil temperature rise to 30 ℃, press heat the stop button；
（4）Press the water pump start button, supply water for condenser, evaporator, oil cooler；
（5）Press the oil pump button to start the oil pump；
（6）5 seconds to 10 seconds, oil pressure and differential pressure of the exhaust pressure is 0.5 ~ 0.6 MPa, by engine start button, the compressor start；
（7）Gradually adjust compressor energy control position at around 30%, the oil temperature of 40 ℃, according to the suction pressure and motor input power, can be increased to 100%；
（8）Compressor into normal operation condition, oil pressure difference should be kept in 0.15 ~ 0.3 MPa, such as oil pressure difference from this range can be adjusted through the constant pressure valve；
（9）Compressor operation pressure, temperature difference between normal, can run for a period of time, then check the movement of parts, temperature, pressure seal, if there is any abnormal situation, should stop check；
（10）Operation for the first time, time shoulds not be too long, about 30 minutes, then you can stop.Order for energy regulation。
Should be especially careful when the the first boot, observe the pressure gauge pressure, watch the light of the lamp, to check whether there is abnormal sound machine, in case of abnormal situation, should immediately stop when necessary.
4、Normal boot
For automatic control of refrigeration units, operation steps, please refer to SCC40 screw compressor controller instructions, you finish the work before starting the below：
（1）Check the oil separator,if the oil level is appropriate (should be in the side-view mirror oil position)；
（2）Open the suction, discharge line valve, manual by-pass valve;
（3）Open the oil system on all valves except to atmospheric;
（4）Open the evaporator, condenser, oil cooler water pump;
（5）In the main motor to start running, slowly increasing load, adjusting the compressor energy around 30%;When the oil temperature of 40 ℃ can be increased to 100%, yet to keep the motor load.
5、Normal stop
For automatic control of refrigeration units, operation steps, please refer to SCC40 screw compressor controller instructions, you finish the work before starting the below：
（1）Close the discharge line valve.
（2）Close the oil cooling in and out of the water valve.
（3）Power cut.
Under normal circumstances, the compressor start-stop frequency shall not exceed 2 times/h.
