Why does the oil pressure rapidly drop when my Johnson Controls SABROE SAB 120 S Air Compressor starts?
If the oil pressure rapidly drops off when your Johnson Controls Air Compressor starts, resulting in a compressor differential alarm, the main oil injection throttling valve might be too wide open, or the oil pressure regulating valve may be improperly adjusted. Readjust both valves.
Why is the discharge pressure excessively high in my Johnson Controls SABROE SAB 120 S Air Compressor?
Excessively high discharge pressure in your Johnson Controls Air Compressor can be due to several reasons. The safety cut-out might be set too low, so check the settings of alarms and warnings. There could be high discharge line loss, so inspect the valves. A malfunctioning condenser may also be the cause; check the condenser, liquid drain, refrigerant charge, water/air inlet temperature, and water/air flow. Finally, air or non-condensable gasses in the system can cause this issue, so purge the air from the condenser side.
How to fix excessively low suction pressure in Johnson Controls SABROE SAB 120 S?
Excessively low suction pressure in your Johnson Controls Air Compressor can be caused by a refrigeration load that's lower than the compressor capacity; in this case, reduce compressor capacity. It could also be due to high suction line loss, so check the valves and strainers. Another cause might be a malfunction of the evaporator, so inspect the evaporator for fouling or accumulated oil. Also, check the liquid expansion valve system, filter in the liquid line, and ensure there is sufficient refrigerant charge.
What to do if my Johnson Controls SABROE SAB 120 S Air Compressor has excessive noise and vibration?
Excessive noise and vibration in your Johnson Controls Air Compressor could stem from several issues. The main oil injection valve may be closed or open too far, so open or adjust it accordingly. Bearing damage or excessive wear can also cause this, requiring bearing replacement. Additionally, the slide valve/slide stop might be out of calibration, needing calibration. A loose coupling on the shaft should be tightened or replaced if damaged. Finally, refrigerant flood back (liquid slugging) can lead to these symptoms, so correct the underlying system problem.
Why won't the capacity slide valve move on my Johnson Controls Air Compressor?
If the capacity slide valve or slide stop on your Johnson Controls Air Compressor won't move, preventing unloading/loading, it could be due to insufficient oil pressure, so check the oil pressure. The solenoid coils might be burned out, requiring replacement. Incorrect valve settings in the hydraulic system could also be the cause, so check according to the hydraulic system description. Lastly, a malfunction of the 4-way control valve of slide components could be the issue, so check according to the description of main components.
What causes high suction pressure and insufficient refrigeration capacity in a Johnson Controls SABROE SAB 120 S Air Compressor?
High suction pressure combined with insufficient refrigeration capacity in your Johnson Controls Air Compressor can occur if the compressor protection valve is opening or leaking, so check the discharge pressure safety cut-out settings and the pilot/main protection valve. An oil return valve that is fully open can also cause this issue, so adjust the regulating valve. Finally, a clogged suction strainer can lead to these symptoms, so clean the strainer.
Why is grease leaking from the vent port of my Johnson Controls Air Compressor?
Grease leaking from the vent port in the side of the pump body is normal and will cease after initial operation. However, black oil leaking from this vent indicates oil seal wear or failure. If leakage exceeds the normal allowable rate of 7 drops per minute, replace the seal.
Why is the oil temperature too high in my Johnson Controls Air Compressor?
High oil temperature in your Johnson Controls Air Compressor, accompanied by high discharge temperature, can be attributed to several factors. Check that the valves in the oil system are fully open. If you have a 3-way oil temperature control valve, check its function and replace the sensor element if needed. For water-cooled systems, check the oil cooler for fouling, water inlet temperature, and water flow. For refrigerant-cooled systems, check/drain accumulated oil in the oil cooler and ensure the gravity-fed refrigerant system is fully flooded. For liquid injection systems, check the settings in the control system, valves, and strainer in the liquid injection line. Also, verify that the compressor protection valve is not open or leaking by checking the discharge pressure safety cut-out ...
What causes gradual oil loss in my Johnson Controls SABROE SAB 120 S?
Gradual oil loss in your Johnson Controls Air Compressor, with an oil level in the coalescer section sight glass, can be due to maintaining too high an oil level; lower the level by opening/adjusting the oil return valve. It could also be caused by refrigerant carry-over or liquid injection overfeeding, so correct the operation. Loss of suction superheat can also contribute, so adjust evaporator feeds. Contaminated oil or damaged coalescer elements may be the cause, so replace the oil charge and coalescers. A closed coalescer return valve should be opened. Finally, a blocked coalescing oil return line strainer should be cleaned.
Why is the discharge temperature very low in my Johnson Controls SABROE SAB 120 S Air Compressor?
A very low discharge temperature in your Johnson Controls Air Compressor, accompanied by low oil temperature and potential oil foaming in the oil separator, can be caused by excessive liquid in the suction line or liquid slugging. Check the evaporator and expansion valve function, and decrease the rate of evaporator temperature "pull down." Alternatively, liquid injection may be overfeeding, so check the settings in the control system and the stability of the liquid injection.
General| Brand | Johnson Controls |
|---|---|
| Model | SABROE SAB 120 S |
| Category | Air Compressor |
| Language | English |
Identifies Frick compressors used in SABROE units.
Explains the meaning of danger, warning, caution, and note symbols.
Outlines qualifications and responsibilities for personnel working on the unit.
Specifies correct usage and limitations of the screw compressor.
Details information found on the unit and pipe system name plate.
Describes the details provided on the compressor's name plate.
Explains the ATEX certified compressor name plate details.
Details ATEX labelling and temperature class markings for explosion-proof equipment.
Illustrates and explains various safety signs found on the equipment.
Covers essential safety measures to be followed during unit operation.
Outlines critical safety procedures for maintenance and service tasks.
Details safety aspects of electrical installations, especially for ATEX compliance.
Explains F-gas regulation requirements for refrigerants and their handling.
Presents noise data and safety recommendations for noise exposure.
Provides an overview of the compressor unit and its control system.
Explains the principle piping and instrumentation diagram for system understanding.
Lists critical valve positions required for normal unit operation.
Step-by-step guide for safely starting the compressor unit.
Covers common problems and solutions for general refrigeration plant issues.
Addresses common issues specific to the compressor unit and its components.
Lists specific problems and solutions related to the compressor block.
Outlines daily, periodic, and major overhaul maintenance tasks for the unit.
Provides a schedule for various maintenance tasks based on operating hours.
Explains procedures and quantities for charging oil into the unit.
Provides step-by-step instructions for charging lubricating oil.
Details essential safety measures to be taken before dismantling equipment.
Provides guidelines for proper disposal of machine parts, oil, and refrigerant.
States the unit's conformity with relevant EU directives and standards.
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