Frick RWF 399 User Manual

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Installation - Operation - Maintenance

ROTARY SCREW COMPRESSOR UNITS

ALL REFRIGERANTS

MODELS

100 through 480

THIS MANUAL CONTAINS RIGGING, ASSEMBLY, START-UP, AND

MAINTENANCE INSTRUCTIONS. READ THOROUGHLY BEFORE

BEGINNING INSTALLATION. FAILURE TO FOLLOW THESE IN-

STRUCTIONS COULD RESULT IN DAMAGE OR IMPROPER OPERA-

TION OF THE UNIT.

S70-600 IOM/MAY 2001

File: SERVICE MANUAL - Section 70

Replaces: S70-600 IOM/MAR 2000

Dist: 3, 3a, 3b, 3c

RWF

Table of Contents

Questions and Answers:

S
scott50Aug 15, 2025
What to do if my Frick Air Compressor pump does not pump?
- C
  Carolyn HillAug 15, 2025
  If your Frick Air Compressor pump isn't pumping, several factors could be at play. First, check for air leaks and ensure the liquid level in the tank is sufficient, as loss of prime is a common cause. Verify that the pump is rotating in the correct direction and that the motor reaches full speed. Make sure both suction and discharge valves are open, and the strainer isn't clogged. Also, the relief valve might be set too low or stuck open. In addition, worn-out pump components could be the reason, so consider replacing the pump. Finally, review any recent changes to the liquid system or operational procedures that might explain the issue, and adjust the end clearance and head position if necessary.
C
connorgarciaAug 18, 2025
Why is my Frick RWF 399 pump not up to capacity?
- D
  Dennis SheaAug 18, 2025
  If your Frick Air Compressor pump isn't reaching its full capacity, it could be due to several reasons. The pump might be starving or cavitating, so increase the suction pipe size or reduce its length. A partially clogged strainer can also restrict flow, so clean it thoroughly. Check for any air leaks in the suction piping or along the pump shaft and repair them. Ensure the motor is running at the correct speed and is wired properly. The relief valve might be set too low or stuck open, requiring adjustment or repair. If the pump is worn out, replacing worn parts is necessary. Finally, adjust the end clearance and head position.
M
michelle49Aug 21, 2025
How to fix a noisy Frick Air Compressor pump?
- K
  kathleen96Aug 21, 2025
  If your Frick Air Compressor pump is excessively noisy, several factors could be contributing. The pump might be starved, meaning heavy liquid isn't reaching it quickly enough, so increase the suction pipe size or reduce its length. Cavitation, where liquid vaporizes in the suction line, can also cause noise; address this by increasing the suction pipe size or raising the liquid level closer to the pump. Ensure proper alignment of the pump. A bent shaft or rotor tooth could be the culprit, requiring straightening or replacement. Lastly, foreign objects entering the pump through the suction port can create noise, so remove any obstructions.
T
Tracy CurtisAug 25, 2025
Why does my Frick RWF 399 pump take too much power?
- T
  Thomas FaulknerAug 25, 2025
  If your Frick Air Compressor pump is consuming excessive power, several factors could be responsible. Ensure the motor specifications are correct. If the liquid is more viscous than the unit is designed to handle, consider heating the liquid, increasing the pipe size, slowing down the pump, or using a larger motor. Verify the discharge pressure and adjust it accordingly if it's higher than calculated. Realign the pump if it's misaligned. Also, check and adjust the clearance on pumping elements to ensure it is sufficient for operating conditions.
S
Sally ConradAug 27, 2025
What to do if Frick RWF 399 Air Compressor pump starts, then loses its prime?
- K
  Kim JuarezAug 27, 2025
  If your Frick Air Compressor pump starts but then loses its prime, several issues could be the cause. Ensure the tank has an adequate liquid level by refilling it. Liquid vaporizing in the suction line can also lead to prime loss, so reduce the temperature or pressure to prevent vaporization. Inspect the suction line and seals for air leaks or air pockets. Finally, worn parts can contribute to this problem, so consider replacing them.
W
weaverkatherineAug 30, 2025
Why is there a high reading on pressure gauge in discharge port of my Frick Air Compressor?
- J
  Jenna McleanAug 30, 2025
  A high-pressure reading on the discharge port of your Frick Air Compressor could stem from several causes. High viscosity combined with a small or long discharge line can increase pressure; reduce viscosity or enlarge/shorten the line. Make sure the gate valve is fully open. A plugged filter will restrict flow, so clean or replace it. Adjust for high specific gravity if the vertical head wasn't considered. Clean the inside of the discharge pipe if buildup is present. Ensure the liquid is at the correct temperature, and address any chemical reactions causing solidification. Finally, adjust the relief valve setting if it's too high.
G
Gregory TaylorSep 2, 2025
What causes a low reading on pressure gauge in discharge port of Frick RWF 399 Air Compressor?
- M
  Mrs. Brittany SandersSep 2, 2025
  A low-pressure reading on the discharge port of your Frick Air Compressor could be due to several factors. The relief valve might be set too low, so adjust the relief valve setting. Inspect and fix the relief valve poppet if it's not seating properly. Reduce extra clearance if there is too much. If the pump is worn, replace worn parts.
B
brownnicholasSep 5, 2025
How to troubleshoot a high vacuum gauge reading in the suction port of a Frick Air Compressor?
- K
  Kayla OrrSep 6, 2025
  A high reading on the vacuum gauge in the suction port of your Frick Air Compressor can be caused by several issues. Check for blockages in the suction line, such as a stuck foot valve, closed gate valve, or plugged strainer. If the liquid is too viscous, reduce its viscosity. Adjust the lift if it's too high. If the line is too small, increase the size of the suction line.
W
William KingSep 8, 2025
What to do if vacuum gauge reading is erratic on Frick Air Compressor?
- R
  Richard PowellSep 8, 2025
  An erratic reading on the vacuum gauge in the suction port of your Frick Air Compressor can arise from a few issues. If the liquid is vaporizing, reduce the temperature or pressure to prevent it. Ensure a continuous liquid supply to the pump, as inconsistent supply can cause erratic readings. Check for cavitation, misalignment, or damaged parts, as vibrations can affect the gauge.
L
lisa65Sep 12, 2025
Why is the vacuum gauge reading low on my Frick RWF 399 Air Compressor?
- L
  Lisa HamiltonSep 12, 2025
  A low vacuum gauge reading in the suction port of your Frick Air Compressor may indicate a few potential problems. Inspect and repair any air leaks in the suction line. Ensure the end of the pipe is submerged in liquid. If the pump is worn, replace worn pump parts. Prime the pump if it is dry.

Frick RWF 399 Specifications

General

Brand	Frick
Model	RWF 399
Category	Air Compressor
Language	English

Summary

Foundation and Rigging

Foundation Requirements

Specifies requirements for the unit's foundation and mounting.

Oil Charge and Cooling Systems

Oil Charge

Details on normal oil charging levels and quantities.

Economizer and Electrical Systems

Economizer - High Stage (Optional)

Explanation of economizer function and operation.

Operation and Start-Up Procedures

Operation and Start-Up Instructions

Overview of the integrated system and start-up logic.

SGC Compressor Features

Key features and design aspects of the SGC compressor.

Compressor Lubrication System

Functions and types of the compressor lubrication system.

System Operation Details

Cold-Start System

Description and operation of the cold-start discharge check valve.

Demand Pump Oil System

Design and purpose of the demand pump lubrication system.

Compressor Oil Separation System

Explanation of how oil is separated from refrigerant.

Oil Cooling and Injection Procedures

Compressor Oil Cooling Systems

Single-Port Liquid Injection

Liquid Injection Adjustment Procedure

Start-Up Procedures

Initial Start-Up

Overview and requirements for initial start-up supervision.

Initial Start-Up Procedure

Detailed steps to follow for the initial start-up process.

Normal Start-Up Procedure

Steps for starting the compressor under normal conditions.

General Maintenance and Shutdown

General Maintenance

Compressor Shutdown and Start-Up

Pump Service and Troubleshooting

Demand Pump Disassembly

Troubleshooting the Demand Pump

Guide to diagnosing and correcting demand pump issues.

Troubleshooting Compressor Operation

Abnormal Operation Analysis and Correction

Four logical steps for analyzing and correcting abnormal operation.

Pressure Transducers - Testing

Component Replacement Procedures

SV Position Potentiometer Replacement and Adjustment

Capacity Linear Transmitter Replacement - Slide Valve

Sensor and Transmitter Replacement

Volumizer® Transmitter Replacement - Slide Stop

Oil Level Transmitter Replacement

Temperature Sensor Replacement

System Troubleshooting Guides

Troubleshooting the RWF Compressor

Common symptoms and probable causes for compressor issues.

Troubleshooting the Oil Separation System

Diagnosing issues with the oil separation system.

Troubleshooting the Hydraulic System

Diagnosing problems with the hydraulic system.

Specific System Troubleshooting

Troubleshooting the Demand Pump System

Diagnosing issues related to the demand pump system.

Troubleshooting the Liquid Injection Oil Cooling System

Diagnosing issues with the liquid injection oil cooling system.

Valves and Alignment Procedures

Thermal Expansion Valves

Jordan Temperature Regulator Valve

Electronic Equipment Installation

Proper Installation of Electronic Equipment in an Industrial Environment

Grounding

Prestart Checklist and Start-Up Report

RWF Compressor Prestart Checklist

Essential checks to complete before unit start-up.

Mechanical Checks

Electrical Checks

Start-Up Report

Form for documenting unit start-up information.

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