Quincy Compressor QSVB Series User manual

QSVB Series
Rotary Screw Vacuum Pump
Instruction Manual
This manual contains important safety information and should be made available to
all personnel who operate and/or maintain this product. Carefully read this manual
before attempting to operate or perform maintenance on this equipment.
Manual No. 65021-AA
April 1999 Edition
Updated: September 2010

TABLE OF CONTENTS
Model Identification 1
Standard Warranty 2
SECTION I
Safety Precautions 3-5
Model Identification 6
SECTION II - DESCRIPTION
General Description of Quincy QSVB Series Vacuum Pumps 7
Principles of Vacuum Pump Operation 7
Description of Air Flow 8
Description of Fluid Flow and Vacuum Pump Cooling System 8
Fluid Coolers 8
Vacuum Control System 9
Auto/Dual with Modulation 9
Auto/Demand – Optional 10
Electrical System Description 10-11
Safety Sensors 11
Indicators 11-12
Gauges 12
SECTION III - INSTALLATION
Receiving 13
Moving the Unit to the Installation Site 13
Location 13-15
Piping Connections 15
Piping Fit-up 15
Relief Valves 16
Electrical 17
Guards 17
Water and Sewer Facilities at the Installation Site (Water-cooled models only) 18
Induction Filtration System 18
Fluid Level 19
Vacuum Pump Rotation 19
Fan Rotation 19
Phase Monitor (Optional) 19

SECTION IV – OPERATING PROCEDURES
Prior To Starting 20
Starting the Vacuum Pump 20
Stopping the Vacuum Pump - Normal Operation 21
Stopping the Vacuum Pump - Emergency Operation 21
SECTION V - MAINTENANCE OR SERVICE PREPARATION
Preparing for Maintenance or Service 22
SECTION VI - SERVICING
Safety 23
Lubrication 23
Fluid Specifications 24
Fluid Life 24
Water Removal 24
Understanding the Analysis Report 25
Product Analysis Report (sample) 26
Fluid Parameters 27
Fluid Filter 28
Vacuum Pump Air/ Fluid Separator Element 29
Continuity Testing of Separator Elements 29-30
Fluid Scavenging System 30
Air Filter 30
Vacuum Pump Shaft Fluid Seal 31
SECTION VII - SERVICE ADJUSTMENT
Differential Pilot Valve 32
Vacuum Pressure Switch 32
Water Regulating Valve (water-cooled units only) 32
Belt Adjustment 33
Belt Drive Inspection Procedure 33
Types of Misalignment 33-35
Belt Replacement 36
Belt Tension Check 37-39
SECTION VIII – TROUBLESHOOTING 40-45
SECTION IX - MAINTENANCE SCHEDULE 46
ADDENDUM 1 - Shell/Tube Heat Exchanger Installation and Service 47
Added 09/2010

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MODEL IDENTIFICATION: QSVB

2
STANDARD WARRANTY
QUINCY VACUUM PUMP DIVISION
INDUSTRIAL SCREW PRODUCTS
QSVB - PACKAGED VACUUM PUMPS - AIR ENDS
REMANUFACTURED AIRENDS AND PARTS
Seller warrants products of its own manufacture against defects in workmanship and materials under normal use and service,
as follows:
QSVB Packaged Vacuum Pumps - Twelve (12) months from date of start-up or twenty-four (24) months from date of
shipment from the factory, whichever occurs first.
Airend on Packaged Vacuum Pumps - Twenty-four (24) months from date of start-up or thirty six (36) months from date of
shipment from the factory, whichever occurs first.
Remanufactured Airend - One (1) year from date of shipment from factory.
Parts - Ninety (90) days from date of Distributor sale or one (1) year from date of factory shipment.
With respect to products not manufactured by Seller, Seller will, if practical, pass along the warranty of the original
manufacturer.
Notice of the alleged defect must be given to Seller in writing with all identifying details including serial number, model
number, type of equipment and date of purchase, within thirty (30) days of the discovery of same during the warranty period.
Seller’s sole obligation on this warranty shall be, at its option, to repair, replace or refund the purchase price of any product or
part thereof which proves to be defective. If requested by Seller, such product or part thereof must be promptly returned to
Seller, freight collect for inspection.
Seller warrants factory repaired or replaced parts of its own manufacture against defects in material and workmanship under
normal use and service for ninety (90) days or for the remainder of the warranty on the product being repaired, whichever is
longer.
This warranty shall not apply and Seller shall not be responsible nor liable for:
(a) Consequential, collateral or special losses or damages;
(b) Equipment conditions caused by fair wear and tear, abnormal conditions of use, accident, neglect or misuse of equipment,
improper storage or damages resulting during shipment;
(c) Deviation from operating instructions, specifications, or other special terms of sales;
(d) Labor charges, loss or damage resulting from improper operation, maintenance or repairs made by person(s) other than
Seller or Seller’s authorized service station.
(e) Improper application of product.
In no event shall Seller be liable for any claims, whether arising from breach of contract or warranty of claims of negligence
or negligent manufacture, in excess of the purchase price.
THIS WARRANTY IS THE SOLE WARRANTY OF SELLER AND ANY OTHER WARRANTIES, EXPRESS,
IMPLIED IN LAW OR IMPLIED IN FACT, INCLUDING ANY WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR PARTICULAR USE, ARE HEREBY SPECIFICALLY EXCLUDED.

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SECTION I
SAFETY CAUTIONS AND WARNINGS
Listed are some, but not all, cautions that must be observed with vacuum pumps and compressed air systems. Failure
to follow any of these warnings may result in death, serious injury and property damage and/or vacuum pump
damage.
This vacuum pump is designed for use in the compression of normal atmospheric air only. No other gases, vapors or
fumes should be exposed to the vacuum pump intake or processed through the vacuum pump.
Disconnect and lock out all power supplies to the vacuum pump plus any remote controllers prior to servicing the
unit.
Relieve all pressure internal to the vacuum pump prior to servicing. Do not depend on check valves to hold system
vacuum.
Do not change the pressure setting of the relief valve, restrict the function of the relief valve or replace the relief valve
with a plug. Over pressurization of system or vacuum pump component can occur, resulting in death, serious injury
and property damage.
Never use a flammable or toxic solvent for cleaning the air filter or any parts.
Do not attempt to service any part while the vacuum pump is operating.
Do not operate the vacuum pump at sump pressures in excess of its rating.
Do not remove any guards or canopy panels while the vacuum pump is operating.
Observe gauges daily to ensure vacuum pump is operating properly.
Follow all maintenance procedures and check all safety devices on schedule.
Never disconnect or tamper with the high air temperature (HAT) sensors.
Use the correct fluid at all times.
NOTE:
Read this manual and follow all instructions prior to installing or operating this vacuum pump.
These instructions, precautions and descriptions cover standard Quincy manufactured QSVB series air vacuum
pumps.
As a service to our customers we often modify or construct packages to customer specifications. This manual may not
be appropriate in those cases.
Every effort has been taken to ensure complete and correct instructions have been included in this manual, however, possible
product updates and changes may have occurred since this printing. Quincy Compressor reserves the right to change
specifications without incurring any obligation for equipment previously or subsequently sold. Not responsible for
typographical errors.

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!DANGER
Air from this vacuum pump will cause death or serious injury if used for breathing
or food processing (if non-food grade fluid is used). Air used for these processes
must meet OSHA 29CFR1910.134 regulations or FDA21CFR178.3570 regulations.

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IMPORTANT
Throughout this manual we have identified key hazards. The following safety alert
symbols identify the level of the hazard.
!DANGER
Hazards or unsafe practices that will result in death or serious injury.
!WARNING
Immediate hazards which could result in death or serious injury.
!CAUTION
Hazards or unsafe practices which may result in minor injury or product or
property damage.

Reference to the machine MODEL, SERIAL NUMBER and DATE OF ORIGINAL START-UP must be made in all
communication relative to parts orders or warranty claim. A model/serial number plate is located on the frame and in
the upper right corner inside of the control panel door.
SPARE PARTS ORDERING -- Coltec Industries, Quincy Compressor Division maintains replacement parts for Quincy
vacuum pumps. A repair parts list is shipped with all new machines. Order parts from your Authorized Quincy distributor.
Use only genuine Quincy replacement parts. Failure to use genuine Quincy parts may void your warranty.
6

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SECTION II
DESCRIPTION
1. General Description of Quincy QSVB Series Vacuum Pumps
The QSVB line of rotary screw vacuum pumps covers the horsepower range of 7.5 to 25 horsepower. The vacuum
pump is a single stage, positive displacement, and fluid-flooded rotary screw type unit. The vacuum pump consists of
two precision machined rotors. The drive rotor is driven through a “V” belt arrangement.
An external fluid pump directly driven by the female rotor maintains fluid circulation. All components are attached
to a heavy-duty steel frame. Controls and indicators are arranged on a control panel.
2. Principles of Vacuum Pump Operation
The compression cycle of a rotary vacuum pump is a continuous process from intake to discharge with no
reciprocating mechanisms starting and stopping as found in reciprocating vacuum pumps. The vacuum pump
consists of two rotors in constant mesh, housed in a cylinder with two parallel adjoining bores. The male drive rotor
has four lobes that mesh with six flutes in the female rotor. All parts are machined to exact tolerances.
As the rotors rotate, (clockwise as viewed from the power-input end) air is drawn into the cylinder through the inlet
port located at the power-input end. A volume of air is trapped as the rotor lobes pass the inlet cut off points in the
cylinders. Compression occurs as the male rotor rolls into the female flute, progressively reducing the space thereby
raising the pressure. Compression continues until the lobe and flute pass the discharge port. The air is then
discharged into the air/fluid reservoir where it is discharged to the atmosphere through the fluid separator element.
There are four complete compression cycles for each complete rotation of the male rotor. (Figure 2-1).
Figure 2-1

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3. Description of Air Flow
With the vacuum pump operating, a vacuum is produced at the pump inlet. Air entering via the vacuum pump air
filter flows directly into the rotor housing where it is compressed. Compressed air passes through the complete
system and is discharged through the discharge port on the reservoir housing. The air/fluid reservoir is equipped with
a safety valve to protect the system in case of excessive restriction to the airflow in the separator element or the
discharge system.
4. Description of Fluid Flow and Vacuum Pump Cooling System
The fluid serves three functions: it lubricates the bearings and rotors; it removes heat from the air as the air is being
compressed thus lowering the compressed air discharge temperature; it also seals the rotor clearances.
Fluid Coolers
Removal of the heat from the fluid is achieved with either an air-cooled heat exchanger or a water-cooled heat
exchanger. The air-cooled fluid cooler is of the finned aluminum tube design. Ambient air is forced through the fins
by a motor driven fan, cooling the fluid in the tubes. To maintain proper vacuum pump operation, the temperature of
the ambient air should not exceed the temperatures listed in the QSVB specifications. The cooler fins must be kept
clean at all times. Fluid leaving the receiver passes through a thermal mixing valve before traveling on to the cooler.
The purpose of the thermal valve is to maintain a minimum fluid discharge temperature at the vacuum pump of
approximately 180°F. The water-cooled fluid cooler is of a shell and tube design. Minimum fluid injection
temperature is controlled by a water regulating valve which senses the fluid temperature entering the vacuum pump
and regulate the cooling water flowing through the fluid cooler. Fluid is circulated through the cooler, fluid filter,
and into the vacuum pump. In the vacuum pump, some fluid is diverted directly through internal passages to ensure
positive lubrication of the bearings, gears and shaft seal. The remainder of the fluid is injected into the early stage
of the compression cycle to seal clearances and cool and lubricate the rotors.

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5. Vacuum Control System
To gain a better understanding of how a Quincy Vacuum Pump operates, let’s assume the Quincy vacuum pump is
set to operate from 20” to 23” Hg vacuum, with a lower set point of 20” Hg and an upper set point of 23”Hg
differential.
When the start button on the vacuum pump is activated, two operations occur. First, electric power is routed through
normally closed contacts on the vacuum switch to the normally open solenoid valve causing it to shift closed.
Second, the inlet valve permits air to flow from the vacuum system to the vacuum pump inlet where it is compressed
to atmospheric pressure and discharged through the air/lubricant reservoir.
The control system remains in this state until the vacuum level in the plant system increases to 20” Hg. At this point,
the vacuum regulator permits more vacuum to be applied to the inlet valve air cylinder causing it to gradually close
the inlet valve until the amount of air permitted into the vacuum pump is equal to the amount of air being leaked into
the plant vacuum system through use. If vacuum usage continues to decrease causing the level to increase to 23”
Hg, the vacuum switch trips, opening the normally closed contacts and stopping power flow to the solenoid. This
causes the solenoid to shift to the normally open position.
This action allows enough air flow from the inlet valve air cylinder through the solenoid to the vacuum pump inlet to
close the inlet valve completely and allows the vacuum level in the system from rising above the maximum set point
of 23”Hg. This cycle continues as required by the system usage and the vacuum level is maintained between 20”Hg.
to 23”Hg. If the vacuum pump stops during operation, either manually by pressing the stop button or automatically
due to a high temperature condition, a check valve feature in the inlet valve prevents air from entering the system
through the vacuum pump.
Do not operate the pump continuously at inlet vacuum levels of 0 – 10” HgV as excessive fluid carryover can occur.
Consult the factory if operating within 0 – 10” HgV.
6. Auto Dual with Modulation
The Auto/Dual system offers two choices of controlling the Quincy QSVB Vacuum pump. With the selector switch
in the “Continuous Run” position, the vacuum pump operates continuously matching demand with a differential pilot
valve controlling the position of the inlet valve. When maximum system vacuum is reached, the vacuum switch
opens, closing the inlet valve and, although the vacuum pump continues to run, no more vacuum will be produced.
When the Auto Dual mode is selected, the vacuum pump will also perform as above; however, a solid state timer is
activated when the vacuum switch contacts open. This timer is adjustable within a ten (10) minute range. When the
timer reaches the end of its delay, the vacuum pump will automatically shut down and assume a "stand-by" mode.
Upon a drop in vacuum pressure, the vacuum switch contacts close, restarting the vacuum pump automatically. The
timer should be set, during unit start-up, for a minimum of ten (10) minutes.
During the unloaded/timing mode, if plant pressure should drop causing the vacuum switch contacts to close, the
vacuum pump will continue to operate, resetting the timer and instructing the inlet valve to re-open.
When operation in the Auto mode allows the vacuum pump to start and stop more than five (5) time per hour, select
the Continuous Run mode and allow the unit to operate continuously. Excessive motor starts will shorten motor life.

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7. Auto/Demand - Optional
The QSVB vacuum pump with Auto-Demand controls accommodate external control signals from an optional
Quincy Demand-A-Matic multiple vacuum pump controller. With the selector switch in the “Local” mode, the
vacuum pump will operate exactly as described in the previously mentioned Auto description. In the “Remote”
mode, the vacuum pump’s vacuum switch is bypassed in favor of the Demand-A-Matic multiple vacuum pump
controller. The vacuum pump will start, draw vacuum, unload and shut down on time delay as determined by the
Demand-A-Matic controller.
!WARNING
Never assume it is safe to work on the unit because it is not operating. It may be in
the automatic stand-by mode and could restart at any time. Follow all safety
instructions in the “Preparing for Maintenance” or “Service” chapters.
8. Electrical System Description
A diagram of the electrical system is shown in the parts manual sent with the vacuum pump. A wiring diagram is
also included in the control panel on all Quincy QSVB vacuum pumps.
NOTE:
Due to continuing product improvements and updates, it is suggested that the wiring diagram included in the
control panel be used when servicing the electrical control.
NOTE:
Standard drive motors are open drip proof with a maximum ambient temperature rating of 104°F. They are
not suitable for salt laden, corrosive, dirty, wet or explosive environments.
The QSVB series vacuum pumps utilize 460V incoming power through an across-the-line magnetic starter. A
transformer in the control panel reduces this voltage to 120 VAC for the various controls on the unit. These controls
include the selector switch, vacuum switch, timer, high air temperature probe, solenoid and the various indicator
lights. Other incoming line voltages are available as options. The vacuum pump is provided with a NEMA 1
enclosure. Optional enclosures include NEMA 4.

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!WARNING
High voltage could cause death or serious injury. Disconnect all power supplies
before opening the electrical enclosure or servicing.
9. Safety Sensors
One high air temperature (HAT) switch is standard on the QSVB units. This switch protects the unit by sensing
unusually high temperatures and shutting the unit down.. The switch is located in the discharge line from the vacuum
pump. These sensors are set to trip at approximately 250°F. The probe is non-adjustable.
!WARNING
Never remove, bypass or tamper with this safety HAT switch. Failure to provide
this safety feature could cause death, serious injury and/or property damage. If the
vacuum pump is shutting down due to high discharge temperature, contact a
qualified service technician immediately.
10. Indicators
Main Power on Light
Indicates when power from the main disconnect switch has been turned on and there is live power at the vacuum
pump control panel. This light will remain on as long as there is power to the unit, regardless of the position of the
control selector switch.
!CAUTION
Always check power supply disconnect. The Power-on light may be inoperable.

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High Discharge Air Temperature Light
Indicates when the unit has sensed an unusually high discharge temperature, approximately 250°F.
11. Gauges
Hourmeter
Indicates actual hours of operation. Used to determine maintenance intervals.
Vacuum Gauge
Indicates the system vacuum in inches of mercury (In. HgV) below atmospheric pressure surrounding the vacuum
pump.
Air Outlet Temperature Gauge
Indicates the temperature of the air/fluid mixture as it discharges from the vacuum pump. Normal reading is 190°F to
210°F.
Air/Fluid Separator Differential Gauge
Indicates pressure differential across the air/fluid separator element. Used to determine separator element change
intervals.
Fluid Level Indicator
The fluid level indicator is a sight gauge located on the air/fluid reservoir and continually monitors the fluid level in
the air/fluid reservoir.
Vacuum Pump Fluid Filter Maintenance Indicator
Indicates when the fluid filter element should be replaced. When the white indicator piston moves from the green
zone into the red zone, the fluid filter should be serviced.

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SECTION III
INSTALLATION
1. Receiving
Upon receipt of the vacuum pump, immediately inspect the vacuum pump for any visible damage which may have
occurred in shipment. If visible damage is found at the time of delivery, be sure a notation is made on the freight
bill by the delivering carrier and request a damage report. If the shipment is accepted and it is later found that the
vacuum pump unit has been damaged, this is classified as concealed damage. If concealed damage is found, report it
within 15 days of delivery to the delivering carrier, who must prepare a damage report. Itemized supporting papers
are essential to filing a claim.
Read the vacuum pump nameplate to be sure the vacuum pump is the model and size ordered and that optionally
ordered items are included.
2. Moving the Unit to the Installation Site
When a forklift is used to move the unit to it's installation site, use forklift slots provided on the side of the main
frame. Use of chains and slings should be limited to the main frame. Do not attempt to lift the unit by attachment to
any components.
NOTE:
See technical data for detailed technical information and dimensions.
!CAUTION
Improper lifting may result in component system damage or personal injury. Follow
good shop practices and safety procedures when moving the unit.
3. Location
Locate the vacuum pump on a level surface that is clean, well lit and well ventilated. Allow sufficient space (four
feet of clearance on all sides and top of the vacuum pump) for safe and proper daily inspection and maintenance.
The entire length of the frame base must be supported. Shim where necessary but do not use wood.
Ambient temperature should not exceed 104°F. (Failure to heed this may result in a high air temperature shutdown.)
Careful consideration of room size and shape must be done so that hot exhaust air from the cooling fan does not
recirculate within the room, causing the operating temperatures to rise. High temperature shutdown may result. All
models are intended for indoor installation; however, it is possible, with certain modifications, to accommodate some
outdoor locations. Cabinet models are water-resistant but not watertight. Sheltering from rain, snow and freezing
temperatures is mandatory.

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!CAUTION
This vacuum pump should not be operated in temperatures below 32°F or above the
limits outlined in the technical data section.
Do not locate the unit where the hot exhaust air from other vacuum pumps or heat generating equipment may be
drawn into the unit. Never restrict the flow of exhaust air from the fluid cooler. The heated exhaust air must be
exhausted to the outside to prevent high ambient conditions in the room. Exhaust piping should be installed in such
a manner as to not create additional backpressure on the vacuum pump. Also, the exhaust piping should be installed
with a drip leg to prevent condensate from falling back into the fluid receiver. If the room is not properly ventilated,
the vacuum pump operating temperatures will increase and cause the high temperature probe to shut the unit off.
!CAUTION
Clean, fresh air, insufficient quantity, is required for proper vacuum pump
operation.
!WARNING
Never locate the vacuum pump inlet system where it can ingest toxic, volatile or
corrosive vapors, air temperatures exceeding 110°F, water, or extremely dirty air.
Taking in any of the above could jeopardize the performance of the equipment or
pose a health hazard to all personnel exposed to the total compressed air system.
In high humidity areas, avoid placing the vacuum pump in a basement or other damp locations. Control the vacuum
pump temperatures and monitor vacuum pump fluid for signs of water contamination. Fluid and filter changes may
need to be increased in high humidity areas. Increased operating temperatures may be required.

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!CAUTION
Removal or modification of sound insulation will result in high sound levels which
may be hazardous to personnel.
The Quincy QSVB models are essentially vibration free, however, some customers may choose to bolt the unit to the
floor to prevent the accidental breakage of piping or electrical connections as a result of being bumped. Only use lag
bolts to locate the unit. Do not pull the bolts down tight as this may, under certain circumstances, place the frame in
a twist or bind causing eventual breakage of fluid coolers, piping and reservoirs.
4. Piping Connections
The vacuum distribution and piping system, including the vacuum pump and all related components, must be
designed in accordance with generally accepted engineering practices. Improperly designed distribution systems can
cause damage to the vacuum pump. Exhaust piping should be installed in such a manner as to not create additional
back pressure on the vacuum pump. Also, the exhaust piping should be installed with a drip leg to prevent
condensate from falling back into the fluid reservoir. (See figure below)
5. Piping Fit-up
Care must be taken to avoid assembling the piping in a strain with the vacuum pump. Piping should line up without
having to be sprung or twisted into position. Adequate expansion loops or bends should be installed to prevent
undue stress at the vacuum pump resulting from the changes between hot and cold conditions. Pipe supports should
be mounted independently of the vacuum pump and anchored, as necessary, to limit vibration and prevent expansion
strains. In no case should the piping be of smaller size than the connection on the vacuum pump unit.

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6. Relief Valves
Pressure relief valves are sized to protect the system. Never change the pressure setting or tamper with the valve.
Only the relief valve manufacturer or an approved representative is qualified to make such a change.
!DANGER
Relief valves are to protect system integrity in accordance with ANSI/ASME B19
safety standards. Failure to provide properly sized relief valves will result in death
or serious injury.
Relief valves are to be placed ahead of any potential blockage point that includes, but is not limited to, such
components as shut-off valves, heat exchangers, and discharge silencers. Ideally, the relief valve should be threaded
directly into the pressure point it is sensing, not connected with tubing or pipe, and pointed away from any personnel.
Always direct discharge from relief valves to a safe area away from personnel.
Relief Valve