Mastercool 90066-A 6 CFM VACUUM PUMP (SINGLE STAGE) User Manual
Vacuum pump operating instructions

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RETURNING A PUMP
Please fax a request for a return authorization number to 973-252-2455. This applies to both
warranty and non-warranty service!
Pumps returned for service without a return authorization number will not be accepted.
In your fax, include your NAME, ADDRESS and PHONE NUMBER along with a detailed
explanation of the problem. We will contact you (i.e. your phone number) to discuss your problem
and determine if you have to return your pump. If you have to return your pump, we will issue you
an RMA #. Then, please follow the instructions below.
• Drain oil, cap all ports and place tape over the exhaust cap. If you fail to do this, your pump will
not be accepted and it will be returned!!!
• Use the original shipping box and inserts if available. Shipping damages are impossible to claim
on used machinery.
LIMITED WARRANTY INFORMATION
The Vacuum Pumps are warranted against defects in material and workmanship for a period of
one year. This warranty does not cover failure due to abuse, improper usage, or progressive wear
and tear. Warranty becomes valid to the original owner and is effective on the purchase date.
WARRANTY SERVICE IS PROVIDED THROUGH THE FACTORY ONLY.
Please contact the service department toll free for parts, service concerns, or to obtain a return
authorization number for warranty repair.
PUMP COMPONENTS
VACUUM PUMP OPERATING INSTRUCTIONS
In order to make the best
use of your investment,
familiarize yourself with the
new features and operating
instructions before
starting pump. Routine care
and maintenance of your
vacuum pump will give you
years of reliable service.
FEATURES
• An air passage prevents
pump oil from returning
to contaminate vacuum
vessel and pipeline after
the pump stops.
• A built-in device
eliminates oil mist and an
oil-gas separator at the
air exhaust outlet takes
care of oil contamination
in the air exhaust.
WARNING! WEAR SAFETY GLASSES
• Specially designed for low
temperature and low voltage
conditions to guarantee
normal starting in winter;
≥41˚F (≥5˚C) temperature
and ±10% rated voltage.
• Pump runs with extremely
high ultimate vacuum and low
noise.
EACH VACUUM PUMP HAS BEEN
FACTORY TESTED FOR CFM AND
MICRON PERFORMANCE.
DO NOT ATTEMPT TO OPERATE WITHOUT USING OIL!!!
Use oil specifically refined for Deep Vacuum Pumps. Use of oil not refined for Deep
Vacuum Pumps and/or operating with contaminated oil will void warranty.
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Non-slip Cushion Handle.
Thermally Protected
Motor with On/Off
Rocker Switch.
High Volume Fan
Provides Cool
Air to Motor &
Pump
Large, Light Weight
Reinforced Base for
Stable Positioning.
Cooling Fins to Keep
Temperature Cooler During
Extended Motor Operation.
Easily Accessible
Oil Drain Valve.
Large
Oil Level
Sight
Glass with
Max/Min
Oil Level
Indicator.
Vapor Discharge/
Oil Fill Port. Easily
Removable. Contains
Internal Check Valve
to Prevent Escape of
Liquid Oil.
Includes T-Fitting
with 1/4” Flare and
1/2” ACME Ports.
1 STAGE
Gas Ballast Valve Helps Prevent
Oil Contamination Caused By
High Moisture.
Vapor Discharge/
Oil Fill Port. Easily
Removable. Contains
Internal Check Valve
to Prevent Escape of
Liquid Oil.
Large
Oil Level
Sight
Glass with
Max/Min
Oil Level
Indicator.
Easily Accessible
Oil Drain Valve.
Large, Light Weight
Reinforced Base for
Stable Positioning.
Non-slip Cushion Handle.
Thermally Protected Motor
with On/Off Rocker Switch.
Protected Slide Switch
to Change Operating
Voltage between
115V/50/60HZ &
22OV/50/60HZ
High Volume Fan
Provides Cool Air to
Motor & Pump
Manifold Valve Isolates
Pump from the System
Testing for Leaks.
Includes 3 Inlet Ports,
1/4”, 3/8” SAE and 1/2”
ACME.
Cooling Fins to Keep Temperature
Cooler During Extended Motor
Operation.
2 STAGE (DUAL VOLTAGE CAPABILITY)
1
4
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Exhaust Cap
Exhaust Fitting
Sight Glass
Oil Tank
Drain Oil
Intake Fitting
Handle
Power Switch
Fan Cover
Motor
Base Plate Board
90062-A-INST