Johnson Controls SABROE SAB 120 L - User Manual

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SAB 120-151 A-frame (including ATEX)

Screw compressor units

Operating manual

en

Table of Contents

Questions and Answers

J
Jason LeeSep 12, 2025
What to do if there is rapid oil loss in my Johnson Controls SABROE SAB 120 L?
- E
  ehoodSep 12, 2025
  Rapid oil loss with no oil level in the coalescer section sight glass in your Johnson Controls Air Compressor can occur if, on shutdown, the compressor unit suction check valve did not close, so repair the valve. The suction check valve bypass may be open too far, so close the valve. Coalescers may be loose or not seated properly, so correct or replace them. On an economized unit, the economizer check valve may not be working, so repair or replace it.
D
Dean MoodyAug 23, 2025
Why is the discharge pressure excessively high in my Johnson Controls Air Compressor?
- L
  Lori RuizAug 23, 2025
  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.
A
Alicia WoodsAug 25, 2025
How to fix excessively low suction pressure in Johnson Controls Air Compressor?
- B
  Brittany SmithAug 25, 2025
  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.
B
Billy RaymondAug 27, 2025
What to do if my Johnson Controls SABROE SAB 120 L Air Compressor has excessive noise and vibration?
- C
  christopher01Aug 27, 2025
  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.
M
Mark GonzalezAug 29, 2025
Why won't the capacity slide valve move on my Johnson Controls SABROE SAB 120 L?
- J
  julie62Aug 29, 2025
  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.
M
Michelle FernandezAug 31, 2025
What causes high suction pressure and insufficient refrigeration capacity in a Johnson Controls SABROE SAB 120 L?
- M
  michael66Aug 31, 2025
  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.
A
amanda84Sep 19, 2025
Why is grease leaking from the vent port of my Johnson Controls Air Compressor?
- V
  Victoria Owen MDSep 22, 2025
  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.
J
Joshua CaseNov 26, 2025
Why is the oil temperature too high in my Johnson Controls SABROE SAB 120 L Air Compressor?
- K
  Katherine PrestonNov 27, 2025
  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 ...
D
Daniel AndersonSep 9, 2025
What causes gradual oil loss in my Johnson Controls SABROE SAB 120 L Air Compressor?
- R
  Regina HallSep 9, 2025
  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.
J
Jennifer ButlerSep 6, 2025
Why is the discharge temperature very low in my Johnson Controls SABROE SAB 120 L?
- D
  Debra SuarezSep 6, 2025
  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.

Johnson Controls SABROE SAB 120 L Specifications

General

Brand	Johnson Controls
Model	SABROE SAB 120 L
Category	Air Compressor
Language	English

Summary

Introduction to Operating Manual

Safety Precaution Definitions

Requirements for Competent Persons

Specifies qualifications and training needed for personnel operating or servicing the unit.

Areas of Application

Application of the Screw Compressor

Outlines the intended use and operational limits for the screw compressor.

Safety Precautions

Signs

Illustrates and explains various safety signs found on the equipment.

During Operation

Provides critical safety instructions to follow while the unit is operating.

Safety During Maintenance and Service

Outlines essential safety measures for maintenance and service activities.

Electrical Installations

Details safety considerations for electrical installations, especially for ATEX units.

Lubricating Oils

Purging a Refrigeration Plant

F-Gas Regulation (Fluorinated Greenhouse Gases)

Installation

Operating Instructions

Valve Positions During Operation

Compressor

Compressor Lubrication System

Capacity Control

Volumizer II Vi Control

Start-Up

Provides essential preparations and steps before starting the compressor unit.

Initial Start-Up Procedure

Details the step-by-step procedure for the initial start-up of the compressor unit.

Normal Start-Up Procedure

Outlines the standard procedure for starting the compressor unit during normal operation.

Stopping Routine

Describes the correct procedures for stopping the compressor unit for brief or long periods.

Troubleshooting

Refrigeration Plant, General Issues

Addresses common troubleshooting issues related to the refrigeration plant.

Compressor Unit, General Issues

Details common problems and solutions specific to the compressor unit.

Compressor Unit - Oil Separation

Compressor Block

Maintenance Instructions

Maintenance of Compressor Unit

Outlines the overall maintenance strategy and schedule for the compressor unit.

Maintenance Intervals

Lists recommended maintenance tasks and their intervals based on operating hours.

Monitoring of Operation

Oil

Oil Charge

Charging Compressor with Lubricating Oil

Provides a step-by-step guide for charging the compressor with lubricating oil.

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