Page 1
Vacuum Pump
Models QV2 & QV5
Operation and Maintenance
Instruction Manual 2002-0010
Rev. 6 – January 2011
Product Leadership • Training • Service • Reliability
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Vacuum Pump Models QV2 & QV5
WARRANTY
Bacharach, Inc. warrants to Buyer that at the time of delivery this Product will be free from
defects in material and manufacture and will conform substantially to Bacharach Inc.’s
applicable specifications. Bacharach’s liability and Buyer’s remedy under this warranty are
limited to the repair or replacement, at Bacharach’s option, of this Product or parts thereof
returned to Seller at the factory of manufacture and shown to Bacharach Inc.’s reasonable
satisfaction to have been defective; provided that written notice of the defect shall have
been given by Buyer to Bacharach Inc. within one (1) year after the date of delivery of this
Product by Bacharach, Inc.
Bacharach, Inc. warrants to Buyer that it will convey good title to this Product. Bacharach’s
liability and Buyer’s remedy under this warranty of title are limited to the removal of any title
defects or, at the election of Bacharach, to the replacement of this Product or parts thereof
that are defective in title.
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED
IN LIEU OF (I) ANY AND ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE: AND (II) ANY
OBLIGATION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR TORT,
WHETHER OR NOT ARISING FROM BACHARACH’S NEGLIGENCE, ACTUAL OR
IMPLIED. The remedies of the Buyer shall be limited to those provided herein to the
exclusion of any and all other remedies including, without limitation incidental or
consequential damages. No agreement varying or extending the foregoing warranties,
remedies or this limitation will be binding upon Bacharach, Inc. unless in writing, signed by
a duly authorized officer of Bacharach.
Register your warranty by visiting
www.mybacharach.com
Notice:
Product improvements and enhancements are continuous, therefore the
specifications and information contained in this document may change without
notice.
Bacharach, Inc. shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance, or use of
this material.
No part of this document may be photocopied, reproduced, or translated to
another language without the prior written consent of Bacharach, Inc.
Copyright © 2005-2011, Bacharach, Inc., all rights reserved.
BACHARACH is a registered trademark of Bacharach, Inc. All other trademarks, trade
names, service marks and logos referenced herein belong to their respective companies.
ii P/N: 2002-0010 Rev 6
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Vacuum Pump Models QV2 & QV5
Contents
Introduction................................................................................................ 1
Features ....................................................................................................1
Oil Pre-Fill Notice ...................................................................................... 1
Technical Characteristics ..........................................................................2
Pump Components ...................................................................................2
Operation................................................................................................... 3
Gas Ballast Operation ...............................................................................4
Warnings & Cautions ................................................................................5
Warnings ......................................................................................5
Cautions .......................................................................................5
Troubleshooting ........................................................................................6
Maintenance and Service.......................................................................... 6
Exploded Drawing .....................................................................................7
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Vacuum Pump Models QV2 & QV5
iv P/N: 2002-0010 Rev 6
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Vacuum Pump Models QV2 & QV5
Introduction
Thank you for selecting Bacharach products for your refrigeration
equipment needs. To ensure your safety, and for the safe operation of
this equipment, please read, understand, and follow the information
contained in this instruction manual.
The model QV2 and QV5 are two-stage, rotary vane vacuum pumps
designed to evacuate moisture and air from refrigeration systems (e.g.,
R-12, R-22, R-134a).
Features
Anti-oil-return – A check valve prevents pump-oil from
entering the evacuated system after the pump stops.
Environment protection – A built-in filter eliminates oil
mist, and an oil-gas separator removes oil contamination
from the exhaust.
Aluminum alloy motor casing – The motor casing is an
aluminum alloy that has a high rate of heat dissipation,
which provides for continuous pump operation.
Two stage design – The second stage of the two-stage
design starts pumping at a lower pressure to pull a deeper
ultimate vacuum.
High starting torque – Designed for low-temperature and
low-voltage operation, the pump will start in temperatures
≥40° F (≥5° C), at its rated input voltage of 110 VAC ±10%.
Oil circulation design – Offset rotary vanes work in
conjunction with the vacuum pump oil to create high
compression within the pumping chamber.
Oil Pre-Fill Notice
CAUTION: Your Bacharach vacuum pump is shipped empty and must
be filled with the oil supplied prior to its first use. The following are the
instructions to fill the unit with oil.
1. Unscrew exhaust cap/oil fill access cap. (Refer to page 2.)
2. Fill the unit through the access port being carful not to over fill. Use
the pump’s sight glass to monitor the oil level.
3. Replace the exhaust cap/oil fill access cap hand tight.
The unit is now ready for use.
P/N: 2002-0010 Rev 6 1
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Vacuum Pump Models QV2 & QV5
Technical Characteristics
Part No.
Voltage
Free Air
Displacement
Ultimate Vacuum
Motor
Intake Fitting
Motor Speed
Oil Capacity
Dimensions
Weight
2002-0001 2002-0005
110V 60 Hz 110V 60 Hz
1.7 CFM 5.3 CFM
25 microns
(0.03 mbar)
1/4 HP 1/2 HP
1/4″, 3/8″, 1/2″ Flare 1/4″, 3/8″, 1/2″ Flare
1,720 rpm 3,450 rpm
11.8 fl oz (350 ml) 14.2 fl oz (420 ml)
13.0 5.3 10.0
(330 135 255 mm)
19.4 lb (8.8 Kg) 24.7 lb (11.2 Kg)
Pump Components
Handle
Power Switch
Fan Cover
Gas Ballast
Rubber Foot
Motor
Valve
Base
QV2 QV5 Model
25 microns
(0.03 mbar)
in
13.8 5.6 10.4 in
(350 143 265 mm)
Intake Fittings
Exhaust Cap
O
(Fitting
Removed)
Oil Tank
Sight Glass
Oil Drain
il Fill Access
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Vacuum Pump Models QV2 & QV5
Operation
Check the pump’s oil level as viewed through the sight glass before each
use. Add oil as necessary through the oil fill access. Use only high grade
vacuum pump oil with the following specifications.
Kinematic viscosity (104 F) 46
Viscosity index 100.0
Flash point 437
Remove the intake fitting cap and connect the pump to the system being
evacuated using a hose with appropriate fittings. Keep the connection as
short as possible and ensure that all connections are sealed and not
leaking. If desired, use a vacuum gauge manifold set to monitor the
vacuum level.
Remove the exhaust fitting cap. Plug the pump into an appropriate AC
outlet. Then turn ON the pump to begin the evacuation process.
After pumping is complete:
turn OFF pump
disconnect the power plug
remove the connecting hose
reinstall intake and exhaust caps.
P/N: 2002-0010 Rev 6 3
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Vacuum Pump Models QV2 & QV5
Gas Ballast Operation
The vacuum pump utilizes a feature allowing for the partial removal of
condensing gases in the vacuum pump. The gas ballast valve can be
operated in the following manner.
CAUTION: If there is a possibility that there is condensation or high
amounts of water in the system, install a vapor
condenser in the line.
Before you begin to draw a vacuum, the pump must be operational
with the intake port closed and the gas ballast valve open until the
instrument has reached its operating temperature. This is done to
ensure that vapor does not condense inside of the pump.
NOTE: The gas ballast should be closed and the intake valve
should be open during typical operation.
Running the pump with the gas ballast valve open typically causes a
slight noise increase as well as an increase in the amount of oil
vapor at the exhaust cap/oil-filler plug vent.
When drawing condensing vapor for an extended period of time,
observe the oil level often and change it frequently as needed.
After the evacuation has been completed, we recommend that you
allow the pump to run for a few minutes with the gas ballast valve
open and the intake closed. This allows any vapor condensed in the
oil to be removed.
4 P/N: 2002-0010 Rev 6
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Vacuum Pump Models QV2 & QV5
Warnings
Do not evacuate combustible, explosive, or poisonous gases.
Do not operate the vacuum pump in the rain.
Do not remove or insert power plug, or turn ON the pump in an
explosive atmosphere.
If using the pump in a confined area, connect a hose to the pump’s
exhaust fitting and route the hose to the outside.
Power the pump from a grounded AC outlet. Consult a professional
electrician to ensure proper grounding.
Do not use a defective AC power plug or outlet.
Cautions
Do not evacuate gases that corrode metal or react chemically with
the pump oil.
If the air being evacuated contains dust or is above 175° F (80° C),
then a filter or cooling device should be installed at the pump’s
intake.
Do not operate the pump for more than 3 minutes with the intake
open to the atmosphere.
For proper cooling and air ventilation, keep the sides of the pump at
least 1" (2 cm) away from walls, and allow 2" (5 cm) of clearance at
the front and rear of the pump.
Do not lay heavy objects on the power cord or allow the power cord
to become pinched.
Operate the vacuum pump in a dry, well-ventilated area.
Do not operate the pump below an ambient temperature of 40° F
(5° C).
Do not use as a compression pump or transfer pump.
Do not operate without clean vacuum pump oil.
Do not block the exhaust fitting when the pump is operating.
When removing the power plug, grip the plug rather than the cord.
P/N: 2002-0010 Rev 6 5
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Vacuum Pump Models QV2 & QV5
Troubleshooting
Problem
Pump does not
produce desired
vacuum
Oil injection
Difficult starting
Probable Cause
Oil level is low Add oil until level is correct as viewed through
Oil is emulsified or dirty Replace dirty oil with fresh, high-grade
Oil inlet or oil flow is
blocked
System leak Check system being evacuated for
Pump is too small Check the size of system being
Pump is worn Rebuild or replace the pump.
Oil seal is damaged Install new oil seal. Oil leakage
Oil tank connection is
loose or damaged
Too much oil is in tank Drain oil until level is correct as viewed
Pump is too small Check the size of the system being
Oil temperature is too low Open intake to atmosphere and
sight glass.
vacuum pump oil.
Clean oil inlet and filtering screen.
leakage and repair.
evacuated and choose proper pump size.
Tighten oil tank screws or replace gasket.
through sight glass.
evacuated and choose proper pump size.
intermittently start motor to heat pump oil.
Remedy
Foreign matter is in pump Clean the pump by replacing pump-oil.
Motor is defective Replace the motor.
Maintenance and Service
If the vacuum pump motor stops because of an overload condition, first
turn OFF the pump and open its intake to the atmosphere. Wait
5 minutes (press the RESET button if present) and try restarting the
pump. If the overload condition persists, refer to the “Difficult starting”
problem under Troubleshooting.
Keep the pump clean and avoid foreign matter from entering the pump.
Keep the vacuum pump oil at the correct level during normal operation
as viewed through the sight glass. Do not run the pump without oil.
6 P/N: 2002-0010 Rev 6
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Vacuum Pump Models QV2 & QV5
Using clean, fresh, vacuum pump oil is a critical part of achieving the
desired vacuum. Replace the pump oil if it becomes dirty and looks
turbid, or contains water or volatile matter. When replacing the oil, first
thin down the oil by running the pump for 30 minutes with the intake
closed. Stop the pump, remove the exhaust fitting and remove the oil
drain plug, allowing the oil to drain. Run pump for 1–2 minutes with
intake open while adding a small amount of clean pump-oil through the
intake to flush out any residual oil in the pumping chamber. Repeat this
process several times until the pump is clean. Replace the oil drain plug,
and then fill the oil tank through the oil fill access with fresh vacuum
pump oil to the desired level as viewed through the sight glass.
When storing the pump, install the intake and exhaust caps and place
the pump in a dry location.
Only qualified technicians should attempt to disassemble and repair the
vacuum pump. Service performed by unauthorized personnel during the
warranty period will void the pump's warranty. For warranty repair and
replacement parts, please call Bacharach Service at 724-334-5000.
Exploded Drawing
1 SIGHT GLASS
2 OIL DRAIN
3 OIL TANK
4 OIL FILLER AND EXHAUST CAP
5 O RING
6 BOLT
7 BACK PUMP COVER 19 TRESTLE
8 BACK PUMP ROTOR 20 CENTRIFUGAL SWITCH BOARD
9 BACK ROTARY VANE 21 INTAKE FITTING 31 CAPACITOR BOX SEAT
10 VALVE SLICE ASSY 22 INTAKE PORT CAP 32 BASE PLATE
11 EXHUAST VALVE 23 HANDLE 33 SCREW
12 BACK PUMP STATOR 24 GAS BALLAST 34 MOTOR STATOR
13 MIDDLE FENCE 25 CAPACITOR BOX 35 MOTOR ROTOR
14 FRONT PUMP ROTOR 26 CAPACITOR 36 UNDER WASHER
15 FRONT ROTARY VANE 27 POWER SUPPLY 37 MOTOR BACK COVER
16 ROTARY VANE SPRING 28 POWER SOCKET 38 FAN
17 FRONT PUMP STATOR 29 SWITCH 39 SPRING REED
18 FRONT PUMP COVER 30 PROTECTOR 40 FAN COVER
P/N: 2002-0010 Rev 6 7
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Vacuum Pump Models QV2 & QV5
Headquarters:
621 Hunt Valley Circle, New Kensington, PA 15068
Ph: 724-334-5000 • Fax: 724-334-5001 • Toll Free: 800-736-4666
Website: www.mybacharach.com • E-mail: help@mybacharach.com
Printed in U.S.A.
8 P/N: 2002-0010 Rev 6
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