Summary of Contents for RFC SL Series
- Page 1 SL series screw refrigeration compressor technical manual Zhejiang Daming Refrigeration Technology Co., Ltd.
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Page 2: Table Of Contents
Table of contents 1. Summary 01 1.1 Product introduction 1.2 model name 1.3 Product Series 01 1.4 Introduction 1.5 design specification 02 1.6 Operating Range Chart 03 2. Refrigerated Oil Management 05 2.1 The role of refrigeration oil in the press knitting machine 05 2.2 S1 compressor specified refrigeration oil 2.3 Refrigerant oil replacement requirements 2.4 External oil circuit system... - Page 3 4.3 Power supply 10 4.4 Electrical accessories selection 5. Main accessories and accessories 11 5.1 Suction filter 5.2 one-way valve 11 5.3 Rubber damping pad 5.4 Accessories in the oil circulation circuit 12 6. Outline 6.1 RFC1 series outline drawing 15 6.2 RFC2 series outline drawing 16 6.3 RFC3 series outline drawing 17 6.4 RFC4 series outline drawing 18...
- Page 4 8. Install and run 25 8.1 Install 8.2 run 9 Failure analysis and maintenance 9.1 General fault description 27 9.2 maintenance 28 9.3 Maintenance points 28...
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Page 5: Product Introduction
SL series compressors all use external oil separators. The use of external oil separators can provide greater flexibility in design and structural arrangement. In the parallel combination system of multiple compressors (from 2 to 6 units) ) can only use a common oil separator. -
Page 6: Product Series
Displacement (m3/h) Semi-hermetic low temperature Motor nominal power (HP) Compressor rated power: 380V-3-50HZ, if customers need other special voltage and frequency, please contact RFC. 1.3 Product Series SL series compressor displacement specification table Figure 1-A SL series compressor displacement specification table... -
Page 7: Introduction
1.4 Introduction The rotors are located in a horizontally arranged compression chamber with a suction port (on the motor side) and a discharge port, with extremely small gaps between the rotors and between the rotors and the housing by means of direct injection onto the rotor profile. The oil film formed by the lubricating oil performs dynamic sealing. -
Page 8: Design Specification
Note: Please confirm the rated current of the compressor under the design conditions according to the RFC selection procedure, and confirm the maximum operating current value according to the limit conditions to select the contactor, power cord and fuse protection... -
Page 9: Operating Range Chart
1. 6 Operating Range Chart SLD series R22 Evaporation temperature °C SLG series R22 Evaporation temperature °C... - Page 10 SLD series R404A/R507 Evaporation temperature °C SLD series R404A/R507 Evaporation temperature °C...
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Page 11: Refrigerated Oil Management
2. Refrigerated oil management 2.1 The role of refrigeration oil in compressors In SL series compressors, refrigeration oil has the following functions: a. An oil film is formed between adjacent compression cavities and between the compression cavities and the shell to reduce the leakage of refrigerant gas during the compression process and improve the compressor efficiency. -
Page 12: Refrigerant Oil Replacement Requirements
If the compressor motor burns, it will produce acidic harmful substances and burnt debris, which will be brought into the system together. During processing, the oil filter element and lubricating oil must be replaced several times until the cleanliness and acidity of the oil circuit meet the requirements. warn: If it is found that the customer does not use the lubricating oil specified by RFC, ... -
Page 13: External Oil Circuit System
The SL compressor needs to be equipped with an oil cooler, and the heat exchange of the oil cooler is obtained according to the RFC selection procedure. RFC requires that the design pressure drop of the external oil circuit system pipeline is not more than 1bar, so as not to affect the normal lubrication of the compressor. -
Page 14: Start, Stop And Capacity Control
3. Start, stop and cooling capacity control 3.1 Cooling capacity control 3.1.1 SL100~420 compressors adopt three-stage energy regulation, the minimum load is 50%, and its control solenoid valve logic is as follows: compressor load 50% solenoid valve 75% solenoid valve Minimum load (start) power ups power outage... -
Page 15: Efficiency At Partial Load And Considerations07
Suggest： To avoid overheating of the motor, the operating time below 50% of the cooling capacity should not exceed 5 minutes. Do not drop the compressor directly from full load to minimum load. If unloading is necessary, the compressor should run for at least 3 minutes at 50% load regulation. When the compressor load is suddenly reduced to the minimum cooling capacity, a large amount of refrigerant may return to the compressor, causing liquid slam;... -
Page 16: Electrical Articles
In order to reduce the starting current, the SL compressor motor adopts the star-delta starting method. The standard motor of SL series compressors is a 3-phase asynchronous 2-stage Y/ △ winding type (rotation speed is 2950r/min at 50Hz), and the applicable voltage is 380V/3/50HZ or 460V/3/60HZ. -
Page 17: Protective Device
Figure 4-2 Three-phase electrical wiring diagram of Y/ △ motor *For star-delta motors, the start-up time of star (closing contactors K1 and K3) should not exceed 1.5 seconds (0.8~1 second recommended); on the other hand, when switching to delta operation (closing contactors K1 and K2) ), when the K3 contactor is disconnected, the K2 contactor must be closed within a delay of 35~50 milliseconds: *For partial winding motors, within 1 second of closing the start contactor K1 (0.6 seconds recommended), then close the running contactor K2... - Page 18 functions: 1) Monitor motor and exhaust temperature; 2) Monitor the rotation direction of the motor; 3) Monitor the power supply for phase loss; Figure 4-3 Protection module wiring diagram 4.2.2.1 temperature monitoring Motor temperature and exhaust gas temperature are monitored by PTC sensors. The exhaust gas temperature sensor is installed near the exhaust shut-off valve.
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Page 19: Power Supply
Normally, the INT 69 module is installed in the junction box of the compressor. However, in the following cases, the module can also be installed in the main control box away from the compressor, but the following points should be noted: 1) The connecting cables to the motor terminals should be carefully checked and connected in the specified phase sequence: L1 is connected to terminal 1;... -
Page 20: Electrical Accessories Selection
IR=I1+I7 IS=I2+I8 IT=I3+I9 R-S-T three-phase unbalanced current: IW=(IR+Is+IT)/3 SB%=Max((IR, Is, IT)-IM)/IM ×100% SB%<5% 1-2-3-7-8-9 Unbalanced current among six terminals: IM=(I1+ I2+ I3+ I7+ I8+ I9)/6 SB%=Max((I1, I2, I3, I7, I8, I9)-IM)/IM ×100% SB%<12% 4. 4 Electrical accessories selection he size of cables, fuses and contactors should be selected according to the maximum working current (FLA) of the motor under normal operating conditions. -
Page 21: One-Way Valve
Figure 5-B Suction filter Figure 5-C Check valve 5. 2 one-way valve When the compressor is stopped, since the refrigerant gas will return from the condenser to the compressor, the rotor will rotate in the opposite direction to balance the pressure; for this reason, the general standard configuration of the compressor is equipped with a one-way valve valve (Figure 5-A, Figure 5-C) to prevent rapid backflow of excess high pressure gas. -
Page 22: Accessories In The Oil Circulation Circuit
5.4 Accessories in the oil circulation circuit SL series compressors provide oil circuit accessories, including oil filter (Figure 5-E), oil flow switch (Figure 5-F), oil circuit solenoid valve (Figure 5-G), sight glass (Figure 5-G) -H), oil connection head, etc. SL100~230 compressors provide 16mm pipe diameter oil path accessories diagram (see Figure 5-J);... - Page 23 Figure 5-K 22mm diameter oil circuit accessories diagram...
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Page 25: Rfc1 Series Outline Drawing
6. Dimensions and dimensions of women's clothing 6.1 RFC1 series outline drawing... -
Page 26: Rfc2 Series Outline Drawing
6.2 RFC2 series outline drawing... -
Page 27: Rfc3 Series Outline Drawing
6.3 RFC3 series outline drawing... -
Page 28: Rfc4 Series Outline Drawing
6.4 RFC4 series outline drawing... -
Page 29: Rfc5 Series Outline Drawing
6.5 RFC5 series outline drawing... -
Page 30: System Applications
7. System application 7.1 Overview The content of this chapter is proposed for the reliable and safe operation of the RFC screw compressor, if there is any violation of the principles, suggestions or questions mentioned in this chapter. Please contact RFC first! For screw compressors, users can compose a system in a similar way to piston compressors. - Page 31 Oil return of flooded evaporator Flooded evaporator systems using HCFC/HFC refrigerants require independent oil return points at the evaporator or low pressure accumulator. The oil return point (preferably more than one) should be set in the range of the oil-rich layer at the liquid level. The oil return pipe should be connected to the suction pipe.
- Page 32 Therefore, RFC strongly recommends that the compressor should be installed on the suction pipe of the compressor. Add a suction filter and clean it regularly for double protection.
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Page 33: External Oil Circuit System
Note: The compressor inlet oil temperature should not exceed 60 Oil coolers mainly include air cooling and water cooling, and the heat of oil cooling can be calculated by RFC selection software. 1) Air-cooled oil-cooled: The oil temperature is realized by the thermostat on and off the oil cooler fan or the stepless speed regulation of the oil cooler fan. - Page 34 legend: 1) Compressor 2) Oil sight glass 3) Solenoid valve 4) Oil flow switch 5) Oil filter 8) Oil separator 9) Condenser 12) Water-cooled cooler 13) Water regulating valve The configuration requirements of the external oil circuit system: 1) The oil cooler should be installed near the compressor to avoid excessive pressure drop in the oil circuit and cause poor oil supply to the compressor;...
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Page 35: Economizer Configuration Requirements
5) It is recommended to install the solenoid valve of the oil circuit at the oil inlet of the compressor to prevent the backflow of oil during shutdown or the possible oil entering the compressor during shutdown; 6) It is recommended to install a manual stop valve (ball valve) before and after the oil cooler for easy maintenance。... - Page 36 It is recommended to install a silencer and a diaphragm check valve near the inlet line of the compressor. 4) Please use the corresponding pipeline according to the interface size of the SL series compressor economizer.
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Page 37: Condensing Pressure Regulation
5) In addition to the thermal insulation requirements of the pipeline to the evaporator, pay attention to fixing the pipeline to prevent vibration to prevent the hidden dangers of solder joint leakage caused by vibration. 7. 5 Condensing pressure regulation The suction and exhaust of the compressor should reach a pressure difference of 4bar within 30S after starting. -
Page 38: Install
the oil heater is controlled by the oil temperature sensor in the oil part.； 3) The external oil component of the parallel unit is equipped with a refueling port and an oil drain valve to facilitate the replenishment and replacement of lubricating oil.； 4) The combined lubricating oil temperature is lower than 20 and cannot be turned on. -
Page 39: Run
◎ Close to the electric control cabinet for easy wiring. ◎ The installation location and direction of the compressor are easy to observe the oil level and daily maintenance. ◎ The strength of the installation position is sufficient, and resonance and noise are not easy to occur. - Page 40 ◎ During vacuuming, the motor insulation must not be measured to avoid serious damage to the motor coil. warn： Start vacuuming and do not measure insulation until refrigerant vacuuming is complete. After the new machine is filled with refrigerant, the insulation value should be at least 5MQ or more, otherwise it should be confirmed whether there is a vacuum.
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Page 41: Failure Analysis And Maintenance
Warning: Too low discharge temperature and too low temperature of lubricating oil in the oil when starting up will cause a large amount of refrigerant to dissolve in lubricating oil, which will not only damage the compressor bearings, but also easily cause the compressor to lose oil. -
Page 42: Maintenance
1. Suction superheat is too high Exhaust air temperature 2. High voltage is too high, the load is too large too high (protection 3. Oil loss, bearing damage module alarm 2) 4. Motor overheating 5. The non-condensable gas content in the system is too high 1. - Page 43 Therefore, the RFC recommends that the oil be changed after the system has been operated for 2000 hours for the first time. If the system needs to be cleaned, do the following: 1) Install an acid removal filter in the suction line;...
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Page 44: Maintenance Points
5. The oil filter must be cleaned regularly to maintain the smooth flow of the oil circuit system, especially after the first installation and commissioning of the system is completed, it must be cleaned up. RFC is supplied with a special oil filter for easy maintenance and replacement.