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FScurtis RS Series - User Manual

FScurtis RS Series
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CAP303
REV Q
SEPT 2020
RS Series
OIL-INJECTED ROTARY SCREW COMPRESSORS
OPERATOR
MANUAL
RSB-15 RSB-20 RSB-25
RSB-30 RSB-40 RSB-50

Table of Contents

Questions and Answers

  • C
    Courtney WardAug 14, 2025
    What to do if my FScurtis RS fails to start?
    • W
      whitechristopherAug 14, 2025
      If your FScurtis Air Compressor fails to start, there are several potential causes. First, ensure the power is on by connecting the main disconnect switch or circuit breaker. Check for blown fuses and replace them if necessary. If the safety circuit has shut down due to high discharge temperature, address the temperature issue as described in the “High Discharge Air Temperature” section of this troubleshooting guide, then press the manual reset button on the high discharge temperature switch and restart the compressor. Also, check for an overloaded motor and press the reset button on the motor starter if needed.
  • A
    Anthony DaltonAug 17, 2025
    Why does my FScurtis Air Compressor keep shutting down?
    • C
      Carly Peterson DDSAug 17, 2025
      If your FScurtis Air Compressor experiences an unscheduled shutdown, it could be due to a high discharge temperature or an overloaded motor. For high discharge temperature, address the issue as described under the “High Discharge Air Temperature” section of this troubleshooting guide, then press the manual reset button on the high discharge temperature switch and restart the compressor. If the motor is overloaded, press the reset button on the motor starter.
  • L
    Laura AllenAug 20, 2025
    What to do if the safety valve blows on my FScurtis RS?
    • I
      ihamptonAug 20, 2025
      If the safety valve of your FScurtis Air Compressor blows, it could be due to several reasons. The air pressure switch might not be set correctly; readjust it so that the compressor unloads at the desired pressure. The inlet valve may not be closing properly, refer to the “Malfunctions in the capacity control system” – (A) “ Inlet valve not opening or closing in relation to air demand” section of this trouble-shooting guide. A dirty separator can also cause this issue, so replace it with a new air/oil separator element. Check the receiver pressure gauge for accuracy and replace it if faulty. Finally, inspect the safety valve for the correct pressure setting and replace it if leaking.
  • M
    Mark WarrenAug 25, 2025
    Why is the receiver pressure low on my FScurtis Air Compressor?
    • R
      Robert WintersAug 25, 2025
      If your FScurtis Air Compressor has a low receiver pressure, there are several possible causes. First, re-evaluate the air demand to ensure it's not excessive. Repair any excessive leaks in the service lines. For an inlet valve that's not fully open, refer to the “Malfunctions in the capacity system” (A) “Inlet valve not opening or closing in relation to air demand” section of this troubleshooting guide. Clean or replace the dirty inlet air filter. Readjust the air pressure switch to the desired cut-in and cut-out pressure. Finally, check the receiver pressure gauge and replace it if faulty.
  • J
    Judy MccartyAug 27, 2025
    How to troubleshoot high discharge air temperature in FScurtis RS?
    • S
      susan07Aug 28, 2025
      High discharge air temperature in your FScurtis Air Compressor can stem from several causes. For water-cooled models, check the water system for restrictions, including the water regulator valve, to ensure enough cooling water is flowing through the cooler. For air-cooled models, ensure there is adequate circulation of cooling air at the cooler; check for obstructions and clean the cooler fins with compressed air while the machine is not running. Also, ensure the oil level in the separator is at the recommended level and replace a dirty oil filter element.
  • W
    William GonzalezAug 31, 2025
    Why is the air delivery low on my FScurtis RS Air Compressor?
    • M
      Melissa PerkinsAug 31, 2025
      If your FScurtis Air Compressor has low air delivery, it could be due to a dirty air filter, so clean or replace the air filter element(s). Another cause could be excessive leaks in the service line, which you should repair. Also, the inlet valve might not be opening completely, refer to the “Malfunctions in the capacity control system” – (A) “Inlet valve not opening or closing in relation to air demand” section of this trouble shooting guide.
  • A
    Angela MorrisSep 3, 2025
    What causes excessive oil consumption in a FScurtis Air Compressor?
    • B
      Beth WilliamsSep 3, 2025
      If your FScurtis Air Compressor is experiencing excessive oil consumption, it could be due to a separator tank that is overfilled; drain the oil to the full mark on the oil level gauge. Another potential cause is a blocked scavenger line, which you should clean, including the orifice. Lastly, a faulty oil filter can contribute to this issue, so replace the oil filter element.
  • M
    michaelsuarezSep 6, 2025
    What causes oil breakdown in FScurtis Air Compressor?
    • G
      gwellsSep 6, 2025
      If the oil in your FScurtis Air Compressor is breaking down, it could be due to extreme operating conditions such as high oil injection and compressor discharge temperatures, high ambient temperature with high humidity, and high receiver pressure. Operate the compressor at the recommended receiver pressure and oil injection temperature. Another cause could be contaminated oil, so service the air filter element and oil filter element in accordance with the maintenance schedule.
  • V
    vanessa58Sep 10, 2025
    Why does the air filter clog frequently on my FScurtis Air Compressor?
    • S
      stephaniepetersSep 10, 2025
      If you are experiencing frequent air filter clogging with your FScurtis Air Compressor, it may be due to a faulty air filter or one that is inadequate for the environment. Replace the faulty air filter element. If the air filter is inadequate, replace it with a heavy-duty air filter.

Summary

SECTION 1 GENERAL SAFETY

SAFETY DECALS

SECTION 2 GENERAL DESCRIPTION

Compressor

Details the oil flooded positive displacement, single stage, helical screw compressor assembly.

Air;Oil Flow

Explains the process of air and oil mixture flow through the compressor system.

SECTION 3 INSTALLATION

General Installation

Covers general procedures and considerations for compressor installation.

Location

Discusses site selection, foundation requirements, and environmental factors for installation.

Outdoor Installation

Specific modifications required for installing the unit in an outdoor environment.

Cold Weather Operation

Outlines conditions to maintain warranty for operation in cold temperatures.

Inlet Air

Importance of clean air supply and requirements for inlet air piping.

Air Discharge

Maintenance of the air/oil cooler for efficient cooling.

Water-Cooled Units

Requirements for cooling water supply and flow rates.

Electrical Connections

Guidelines for connecting the power supply to the compressor unit.

Oil Level Check

Procedure for checking and maintaining the correct oil level in the compressor.

Storage

Recommendations for storing the compressor for extended periods.

Freight Damage Procedures

Steps to follow if the shipment is received with damage.

SECTION 4 OPERATION

General Operation

Overview of compressor testing, power connection, and system integration.

Operating Modes

Describes the dual control system: load/unload and start-stop modes.

Load;Unload Control

Explains the constant mode for continuous operation and load/unload cycles.

Start-Stop Control

Details the automatic mode where the motor starts and stops based on pressure.

Minimum Pressure Valve

Function of the valve that maintains pressure in the oil reservoir.

Thermostatic Control Valve

How the valve regulates oil temperature and prevents moisture contamination.

Initial Start-Up

Step-by-step guide for the first time starting the compressor.

Shutting Down the Compressor

Procedure for safely stopping the compressor operation.

SECTION 5 MAINTENANCE

General Maintenance

Importance of a good maintenance program for compressor longevity.

Air Filter Servicing

Guidelines for servicing and replacing air filter elements based on conditions.

Standard Air Filter Replacement

Step-by-step instructions for replacing standard air filter elements.

Heavy-Duty Air Filter Replacement

Instructions for replacing heavy-duty air filter elements.

Lubricant Management

Details on type, checking level, and adding FS CURTIS FSC-8000 lubricant.

Oil Filter Replacement

Procedures for changing the oil filter element at specified intervals.

Separator Element

Information on the air/oil separator element and its replacement.

Thermostatic Control Valve

Function and repair of the thermostatic control valve.

Minimum Pressure Valve

Description of the minimum pressure valve's function and design.

Inlet Valve

Details on the inlet valve, its function, and potential issues.

Drive System Maintenance

Routine checks and maintenance for the drive system, including belts.

Sheave Alignment

Importance and method for ensuring proper sheave alignment for belt life.

Fan Maintenance

Checks for the fan's condition, mounting, and blades.

MAINTENANCE SCHEDULE

V-BELT TROUBLESHOOTING CHECK LIST

SECTION 6 SPECIFICATIONS

Engineering Data

Table of key engineering specifications for different RSB models.

Installation Drawings

Visual representations of installation dimensions for various models.

WIRING DIAGRAM FOR FULL VOLTAGE START RSB MODELS

WIRING DIAGRAM FOR WYE;DELTA START

WIRING DIAGRAM AND LOCATION DIAGRAM FOR WATERCOOLED RSB MODELS

Recommended Bolt HHCS Torque Specifications

Separator Tank Lid Bolt Torque Specifications

Torque specifications for the separator tank lid bolts.

Bolt Torque Sequence

Diagram showing the correct sequence for tightening bolts.

COMPRESSOR MAINTENANCE LOG

FScurtis RS Series Specifications

General IconGeneral
BrandFScurtis
ModelRS Series
CategoryAir Compressor
LanguageEnglish

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