Mastercool 90066-A 6 CFM VACUUM PUMP (SINGLE STAGE) - Manual (Page 2)

b. If the oil is contaminated, drain the oil by placing the pump on a level surface and opening the
oil drain valve. Catch the waste oil in a container and properly dispose of it.
c. If the pump has been sitting for more than one month, the oil is considered contaminated
regardless of appearance and should be changed as outlined above.
d. To add oil, close drain, remove the oil fill cap and fill to the Oil Level Line with fresh oil.
5. INTAKE CONNECTIONS
Replace all caps and finger-tighten. Do not use caps with damaged or missing O-rings and
always store vacuum pump with capped ports to prevent dirt and moisture contamination.
6. PUMP MOTOR
The PUMP and OIL must be above 30˚F (1˚C). The line voltage must be equal to the rating on the
motor nameplate ±10%. Normal operating temperature is approximately 160˚F (71˚C), which is
HOT to the touch! Line voltage and ambient temperature will affect the normal operating
temperature. Your vacuum pump is designed for continuous duty and will run for extended
periods without overheating. The motor has an automatic resetting overload protection feature. If
the motor will not restart the pump after shut-off, it may have opened the thermal protection.
Disconnect the pump from the system, wait about 15 minutes for the motor to cool down and
then try again.
WARNING:
1) Do not evacuate combustible, explosive or poisonous gases.
2) Do not evacuate gases that corrode metal or react chemically with pump oil.
3) The temperature of evacuated gas shall not exceed 176˚F (80˚C) and ambient temperature
shall be 41˚F ~ 140˚F (5˚C ~ 60˚C).
4) Do not operate without oil.
5) Do not touch the machine’s hot surface during operation.
6) Do not block air outlet.
CAUTION:
To reduce the danger of electric shock, keep the pump indoors and do not expose to rain.
DANGER:
1) With a grounding socket the operating voltage is rated ±10%; Receptacle shall be well
grounded, or else electric shock may be caused. Should power cord or plug require
repair or replacement, do not connect grounded wire to any flat adapter connector. If its
surface is green, with or without yellow stripe, the insulation wire is grounding wire. If you
cannot fully understand grounding instructions and have doubt whether correct grounding is
made, check with a professional electrician or service man. Do not change the structure of
attached adapter connector.
2) When pulling out power plug, make sure to pull the plug rather than the wire.
3) Do not place heavy matter on power wire or let power wire be squeezed.
4) Do not use broken plug or socket.
5) Do not pull out power plug with wet hand.
6) Do not pull out, insert power plug or turn on power switch where flammable gases may be
present.
1. OIL FILL
This vacuum pump has been tested at the factory and shipped with only trace amounts of oil. OIL
MUST BE ADDED BEFORE OPERATING! Failure to add oil will damage cartridge and void warranty!
a. Make sure the oil drain valve located below the front casing is closed before attempting to add
oil.
b. Remove the oil fill plug from the top of pump and insert the oil bottle into the fill port.
c. Slowly add oil until oil level rises to the top of the Oil Level Line. Do not overfill with oil!
d. Replace the oil fill plug.
OIL CAPACITY:
2. CHECKING OIL LEVEL
a. Open the gas ballast valve (small brass fitting located next to the handle) one turn. Do not
remove! (AVAILABLE ON 2 STAGE PUMPS ONLY)
b. Start pump and run with intake port capped for about two minutes. Observe the oil level with
the pump running. The oil level in the sight glass should be even with the level line.
c. If the level is low, open the intake port and run pump for 15 seconds, stop pump and observe
oil level again. Add a small amount of oil as needed.
3. GAS BALLAST VALVE (2 STAGE MODELS)
The gas ballast valve must be partially opened for the first part of the evacuation procedure.
After about two minutes close the valve and continue the evacuation procedure to reach ultimate
vacuum. Failure to close the valve during high vacuum operation will result in poor vacuum
performance.
During the first stages of evacuation, vapors are highly concentrated. Unfortunately, some vapors
will condense into a liquid and mix with the oil, thus reducing the oil’s ability to produce a deep
vacuum. The GAS BALLAST VALVE emits a controlled amount of dry air into the pump during
compression to minimize condensation and keep oil relatively clean during the first part of the
evacuation. Periodically remove the Gas Ballast Valve Needle and clean or replace the O-ring.
Clean mating surfaces and lightly coat with vacuum pump oil before securely retightening.
4. CHANGING OIL
In order to reach the deep vacuum required, your vacuum pump needs clean, moisture-
free oil during evacuation. Dirty oil becomes a mixture of corrosive acids and water that effects
the pump’s ability to pull a deep vacuum. Left sitting in the pump, this sludge will rust and erode
internal surfaces shortening the pump’s life.
Care should be taken to avoid contact of oil with skin or eyes. OIL MAY BE HOT! Used oil should
be properly disposed of in a leakproof corrosive-resistant container according to local
regulations.
a. After every evacuation, while the pump is warm and oil is thin, take a small sample of oil from
the drain port.
3 CFM 1 Stage 13.5 OZ / 400 ML
3 CFM 2 Stage 13.5 OZ / 400 ML
6 CFM 1 Stage 15.2 OZ / 450 ML
6 CFM 2 Stage 13.5 OZ / 400 ML
10 CFM 2 Stage 19.3 OZ / 570 ML
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