Quincy Compressor QSVI Series

Questions and Answers

J
jefferyhowardAug 22, 2025
Why does my Quincy Compressor Water Pump have an unscheduled shutdown?
- K
  Kimberly DaltonAug 22, 2025
  An unscheduled shutdown of your Quincy Compressor Water Pump can occur due to several reasons: * High air discharge temperature: Address the high temperature issue following the instructions in the "High Discharge Air Temperature and/or High Fluid Injection Temperature" section and then restart the pump. * Thermal overload relays tripping: Identify and correct the cause of the overload, then reset the overload relay and press the reset button. * Power failure: Check the power supply to the unit. * Faulty HAT switch: Contact a qualified service technician. * Loose wire connections: Inspect all wiring terminals to ensure they are tight and making good contact. * Faulty control relay: Replace the relay.
S
stacey23Aug 25, 2025
What causes high discharge temperature in my Quincy Compressor QSVI Water Pump?
- R
  ramosmadisonAug 25, 2025
  High discharge temperature and/or high fluid temperature in your Quincy Compressor Water Pump can be caused by: * Removed cabinet panels: Replace all panels, ensuring sealing surfaces and materials are in good condition. * High cooling water temperature: Check and adjust the cooling water temperature as necessary. * Dirty cooling radiator: Clean the radiator to ensure adequate airflow across the fins. * Low fluid level: Add fluid to the required level in the reservoir. * High operating pressure: Rotary screw pumps should operate in the 10" to 29.9" HgV range; operating above 10" may cause overheating. * Excessive pressure in the exhaust line: Clear any restrictions in the exhaust line to maintain atmospheric pressure at the discharge.
B
Barbara WardSep 3, 2025
Why won't my Quincy Compressor QSVI load when vacuum line pressure rises?
- A
  Amanda MurphySep 3, 2025
  If your Quincy Compressor Water Pump doesn't load when the vacuum line pressure rises, consider these potential causes: * Repair or replace the vacuum pressure switch if it is faulty. * Check and tighten wiring terminals if the connection is loose. * Check and repair the air inlet valve if the air inlet valve assembly is jammed. * Repair or replace the solenoid if it is faulty. * Check and replace the timer if it is faulty. * Clean or replace the differential pilot valve if the orifice is plugged.
M
Michael PerezSep 5, 2025
Why does my Quincy Compressor QSVI cycle too rapidly between load and unload?
- K
  Kristine WaltersSep 5, 2025
  Rapid cycling between load and unload in your Quincy Compressor Water Pump can be caused by: * Too small system volume: Increase system volume by adding piping or a receiver to the vacuum system. Be aware that added volume increases time to cyclic applications, so consult with the factory. * Leaks in control lines: Check and repair any leaks. * Faulty vacuum switch: Repair or replace as necessary.
S
Sarah TerrellSep 7, 2025
Why does my Quincy Compressor Water Pump operate with high discharge temperatures?
- M
  Michael JenkinsSep 7, 2025
  If your Quincy Compressor Water Pump is operating with high discharge temperatures, consider the following: * Check the fluid cooler for varnishing and rust deposits. If present, clean the cooler thoroughly following the heat exchanger manufacturer's recommended procedures. * Ensure ambient temperatures are not exceeding 110°F, as excessive ambient temperatures can cause this issue. * Correct the fan rotation so that it pushes air up through the coolers. * Use only the recommended fluids. * Clean and replace the air filter as necessary. * Repair or replace the thermal valve if it's faulty. * Check and replace any faulty gauges. * If there is airend failure, contact a Quincy authorized distributor.
E
Emily RichardsSep 9, 2025
Why does my Quincy Compressor Water Pump experience frequent fluid filter clogging?
- C
  Carlos RodriguezSep 9, 2025
  Frequent fluid filter clogging in your Quincy Compressor Water Pump may be due to: * A faulty indicator: Replace the indicator assembly. * An incorrect fluid filter: Use genuine Quincy replacements only. * A faulty, incorrect, or inadequate air filter: Replace the filter element and consult the factory if necessary. * Fluid breakdown: Follow the instructions in the "Fluid Breakdown" section of this troubleshooting guide to correct the situation. * System contamination: Check and clean the system of all dirt, corrosion, and varnish. * Inadequate circulation of cooling air at the cooler: Ensure there are no restrictions to free air circulation around the cooler. Also, check the cooler fins and clean them with air (while the machine is not running) if they are dust-laden.
J
Jonathan ClaytonSep 12, 2025
Why won't my Quincy Compressor Water Pump time-out or shut down when unloaded?
- J
  Jaime JonesSep 12, 2025
  If your Quincy Compressor Water Pump won't time-out or shut down when unloaded: * Check and replace the timer, as necessary, if it is faulty. * Check all wiring terminals for contact and tightness if there are loose wire connections. * Check and repair leaks in control lines.
J
jacqueline02Sep 15, 2025
What causes fluid to surge into the vacuum line after shutdown in my Quincy Compressor?
- J
  John HaysSep 15, 2025
  If fluid surges into the vacuum line after shutdown in your Quincy Compressor: * Check and repair the inlet valve if it is not closing properly. Also, install an auxiliary check valve. * Check and resolve the condition if there is excessive exhaust pressure.
P
parkscarolynSep 17, 2025
Why is the fluid cloudy and the pump running hot in my Quincy Compressor QSVI?
- T
  Timothy SimsSep 18, 2025
  If the fluid in your Quincy Compressor Water Pump is cloudy and the pump is running hot, it could be due to condensable in the fluid. In this case, you should change the fluid.
T
Tyrone WilsonNov 19, 2025
What to do if my Quincy Compressor Water Pump fails to start?
- D
  David JonesNov 19, 2025
  If your Quincy Compressor Water Pump fails to start, there are several potential causes and solutions: * Ensure the power is turned "ON" by closing the main disconnect switch or circuit breaker. * If the control circuit fuse is blown, replace it and identify the cause. * If a safety circuit shutdown occurred due to high discharge air temperature, address the high temperature issue (according to the "High Discharge Air Temperature and/or High Fluid Injection Temperature" section) and restart the pump. * If thermal overload relays are tripping, determine the cause of the overload, reset the relay, and press the start button. * For low voltage, ask the power company to check the voltage at your entrance meter and compare it to the reading at the motor terminals to locate the sourc...

Summary

Standard Warranty

Safety Hazard Symbols

DANGER

Immediate hazards resulting in severe personal injury or death.

WARNING

Hazards or unsafe practices resulting in personal injury or death.

CAUTION

Hazards or unsafe practices resulting in minor personal injury, product, or property damage.

Section 1 - General

Safety Precautions

Essential safety precautions for operating vacuum pumps and systems.

Installation Hints for Vacuum Service

Guidelines for properly installing QSVI vacuum pumps to ensure optimal performance.

Section 2 - Description

QSVI Vacuum Pumps

Overview of QSVI rotary screw vacuum pumps, their design, and components.

Principles of Vacuum Pump Operation

Explanation of how QSVI vacuum pumps function to create vacuum.

Air Flow

Describes the path and process of air through the vacuum pump system.

Fluid Flow & Cooling System

Details the circulation of fluid for lubrication, sealing, and cooling in the pump.

Fluid Coolers

Explains the function and types of heat exchangers used for fluid cooling.

Air;Fluid Reservoir & Air;Fluid Separator Element

Describes the reservoir and separator element's role in fluid management.

Auto Dual With Modulation

Explains the dual control mode for pump operation and modulation.

Auto Demand-Optional

Details the optional Auto/Demand control feature for multiple pump systems.

Electrical System

Overview of the pump's electrical components, wiring, and voltage considerations.

Indicators & Gauges

Explains the purpose and function of various indicators and gauges on the pump.

Section 3 - Installation

Receiving

Procedures for inspecting the vacuum pump upon delivery for damage.

Moving the Unit to the Installation Site

Guidelines for safely moving the vacuum pump unit.

Location

Recommendations for selecting an appropriate installation site for the pump.

Piping Connections

Proper methods for connecting piping to the vacuum pump system.

Piping Fit Up

Instructions for ensuring piping alignment and preventing strain on connections.

Pressure Relief Valves

Importance of correctly sized pressure relief valves for system safety.

Electrical

Requirements for electrical supply, wiring, and grounding during installation.

Pneumatic Circuit Breakers or Velocity Fuses

Notes on pneumatic circuit breakers or velocity fuses for protection.

Guards

Emphasizes the need for guards to be in place for safety.

Water Piping

Guidelines for water piping size and flow for cooling systems.

Cooling Water

Recommendations for water quality and maintenance for water-cooled units.

Safety Labels;Decals

Importance of maintaining safety labels and decals for hazard awareness.

Instruction Manual

The necessity of keeping the instruction manual accessible and up-to-date.

Induction System

Guidance on selecting and installing proper inlet filtration systems.

Fluid Level

Procedures for checking and maintaining the correct fluid level in the reservoir.

Vacuum Pump Rotation

How to check and ensure correct rotational direction of the vacuum pump.

Phase Monitor

Explanation of the optional phase monitor for electrical protection.

Section 4 - Procedures

Prior to Starting

Checklist of essential steps before starting the vacuum pump unit.

Starting the Vacuum Pump

Steps for safely starting the vacuum pump and initial checks.

Stopping the Vacuum Pump- Normal Operations

Procedure for normal shutdown of the vacuum pump unit.

Stopping the Vacuum Pump- Emergency Operation

How to perform an emergency shutdown of the vacuum pump.

Section 5 - Maintenance or Service Preparation

Preparing for Maintenance or Service

Procedures for safely preparing the pump for maintenance or service.

Section 6 - Servicing

Safety

Critical safety procedures for personnel performing service on vacuum pumps.

Lubrication

Details on the type of fluid used and its lubrication properties.

Fluid Specifications

Recommended fluid type and specifications for Quincy QSVI pumps.

Fluid Life

Information on the expected lifespan of the fluid and analysis services.

Understanding the Analysis Report

How to interpret fluid analysis reports for pump health monitoring.

Vacuum Pump Fluid Filter

Maintenance and replacement procedures for the fluid filter.

Vacuum Pump Air;Fluid Separator Element

Guidelines for changing the air/fluid separator element.

Fluid Scavenging System

Proper operation and maintenance of the fluid scavenging system.

Inlet Air Filter

Servicing and replacement of the inlet air filtration system.

Vacuum Pump Shaft Fluid Seal

Information on the shaft seal, its function, and replacement.

Preparation for New Seal Installation

Steps to prepare for installing a new vacuum pump shaft seal.

Seal Installation

Procedures for correctly installing the shaft seal assembly.

Section 7 - Service Adjustments

Differential Pilot Valve

Adjusting the pilot valve for desired system modulation and vacuum levels.

Vacuum Switch

Setting the vacuum switch for pump load and unload points.

Water Temperature Regulating Valve

Adjusting the water regulating valve for optimal fluid temperature.

Coupling Alignment

Importance and procedure for checking and correcting motor-pump alignment.

Correcting Angular Misalignment

Steps to correct angular misalignment of the pump and motor.

Parallel Misalignment Viewed From the Side

Method for checking parallel misalignment from the side view.

Angular Misalignment Viewed From the Top

Method for checking angular misalignment from the top view.

Water-Cooled Heat Exchanger

Maintenance of water-cooled heat exchangers to prevent issues.

Section 8 - Trouble Shooting

FAILURE TO START

Common causes and solutions for the pump failing to start.

POOR PROCESS PRESSURE

Diagnosing and resolving issues related to poor process pressure.

POOR PUMPING SPEED (Capacity)

Identifying causes for reduced pumping speed and capacity.

HIGH DISCHARGE TEMPERATURE AND;OR HIGH FLUID TEMPERATURE

Troubleshooting high temperature issues in discharge or fluid.

FREQUENT AIR;FLUID SEPARATOR CLOGGING

Addressing recurring clogs in the air/fluid separator.

INLET VALVE NOT OPERATING OR CLOSING IN RELATION TO DEMAND

Issues with the inlet valve's response to system demand.

VACUUM PUMP DOES NOT LOAD WHEN VACUUM LINE PRESSURE RISES

Problems with the pump loading based on vacuum line pressure.

UNSCHEDULED SHUTDOWN

Troubleshooting steps for unexpected pump shutdowns.

THERMAL OVERLOADED RELAYS TRIPPING

Causes and solutions when thermal overload relays trip.

VACUUM PUMP WILL NOT TIME-OUT AND SHUT DOWN WHEN UNLOADED

Troubleshooting when the pump fails to time out and shut down.

TOO RAPID CYCLING BETWEEN LOAD AND UNLOAD

Identifying causes for frequent cycling between load and unload states.

FREQUENT FLUID FILTER CLOGGING

Addressing recurring clogs in the fluid filter.

UNIT OPERATING WITH HIGH DISCHARGE TEMPERATURES

Diagnosing and resolving high discharge temperatures during operation.

EXCESSIVE FLUID CONSUMPTION

Troubleshooting causes for high fluid consumption by the pump.

FLUID SURGES INTO VACUUM LINE AFTER SHUT-DOWN

Issues with fluid surging into the vacuum line post-shutdown.

FLUID IS CLOUDY AND PUMP RUNS HOT

Causes and solutions when pump fluid is cloudy and the pump runs hot.

O-RING FITTINGS

Installation Instructions (SAE Straight Thread O-Ring Fitting)

Step-by-step guide for installing SAE straight thread O-ring fittings.

Section 9 - MAINTENANCE SCHEDULE

Periodically;daily - 8 hours maximum

Daily checks including gauges, fluid level, leaks, noise, and safety valve.

Weekly

Weekly maintenance tasks like servicing the air filter.

Monthly

Monthly tasks such as cleaning fluid cooler fins and wiping the unit.

6 months or every 1000 hours

Semi-annual or 1000-hour maintenance including fluid filter, strainer, and bolt checks.

Periodically;Yearly

Annual tasks like changing the fluid separator, inlet filter, and lubricating motors.

6000 hours or as fluid analysis program directs

Maintenance based on fluid analysis, including fluid changes.

Two Years

Replacement of cooler hoses after two years.

Technical Data Sheet: QSVI 25

General Specifications

Key operational and physical characteristics of the QSVI 25 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 25 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 25.

Water-Cooled Data

Specifications related to water cooling for the QSVI 25.

Sound Level

Noise levels for the QSVI 25 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 25 unit.

Technical Data Sheet: QSVI 40

General Specifications

Key operational and physical characteristics of the QSVI 40 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 40 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 40.

Water-Cooled Data

Specifications related to water cooling for the QSVI 40.

Sound Level

Noise levels for the QSVI 40 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 40 unit.

Technical Data Sheet: QSVI 50

General Specifications

Key operational and physical characteristics of the QSVI 50 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 50 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 50.

Water-Cooled Data

Specifications related to water cooling for the QSVI 50.

Sound Level

Noise levels for the QSVI 50 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 50 unit.

Technical Data Sheet: QSVI 75

General Specifications

Key operational and physical characteristics of the QSVI 75 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 75 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 75.

Water-Cooled Data

Specifications related to water cooling for the QSVI 75.

Sound Level

Noise levels for the QSVI 75 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 75 unit.

Technical Data Sheet: QSVI 100

General Specifications

Key operational and physical characteristics of the QSVI 100 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 100 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 100.

Water-Cooled Data

Specifications related to water cooling for the QSVI 100.

Sound Level

Noise levels for the QSVI 100 in different configurations.

Maximum Dimensions

Physical dimensions of the QSVI 100 unit.

Technical Data Sheet: QSVI 200

General Specifications

Key operational and physical characteristics of the QSVI 200 pump.

Electrical Data

Electrical consumption and power ratings for the QSVI 200 model.

Fluid System

Details on the fluid system, capacity, and temperature ranges.

Air-Cooled Data

Specifications related to air cooling for the QSVI 200.

Water-Cooled Data