MAINTENANCE
1. Vacuum pump oil has three major functions: pump lubricant, pump cooling, and pump sealant.
During the evacuation process, the pump oil will absorb moisture being pulled from the system,
causing it to be less effective as a lubricant and pump vane seal, extending evacuation time and
possibly allowing the pump to overheat. We recommend that the oil be changed just before
evacuating each A/C-R system to insure the pump oil is in a clean condition as this is the key factor
Note: Should the pump oil become opaque, dirty, or full of moisture, promptly change oil. This will
in determining if the pump can achieve the required vacuum levels. In order to maintain the
optimum operation of the pump, we recommend that you use NAVAC vacuum pump oil. This oil is
greatly speed up evacuation, especially when there is a lot of moisture in system piping from
having been left open to the atmosphere for an extended period of time.
made using a unique process and can maintain proper viscosity during normal operation and
temperatures, and it’s also helpful for cold starts. Should the NAVAC oil not be available, reputable
brands of special-purpose vacuum pump oil may be used.
1. To ensure that the pump and oil are warm, run pump for approximately one minute prior to
2. While the pump is running, open one inlet port and allow oil to drain out of the pump. After turning
3. As oil stops draining, tip the pump to drain any remaining oil in the bottom of the pump.
Oil change procedure:
4. Close oil drain valve.
off pump, open the oil drain plug, and drain used oil into an appropriate vessel and dispose of
procedure prior to using the pump above).
changing oil. Do not run longer than this, as it may be possible to damage the pump.
properly.
5. Remove oil fill cap, pour in new oil until the oil is at the proper level in the sight glass (the same
REQUIREMENTS FOR WARRANTY COVERAGE
2. Products which have not been maintained or dismantled by unauthorized parties.
liable for any other costs, such as time spent in fixing the issue, refrigerant
consumption,
be performed during the warranty period.
1. Products issues due to manufacturing defects confirmed by qualified agents.
3. Products that have been used in accordance with the User Manual. All maintenance services shall
Product warranty is provided for product quality problems for one year from date of sale. For warranty
to be valid, the following conditions must be met:
Statement: Other than repairing the product defective, the manufacturer of this product will not be
Oil drains out from here
TROUBLESHOOTING
Malfunction
Low
Vacuum
Oil leak
Start-up
problems
Oil spray
Possible Cause
1. Secondary air inlet connection cap loose on the
air inlet port.
2. Damaged rubber ring inside the secondary air
inlet connection cap.
3. The volume of oil is insufficient.
4. Pump oil becomes opaque or absorbed too
many impurities.
5. The pump’s oil entry hole is clogged or the oil
supply is insufficient.
6. The pump connecting hoses, manifold or
system has a leak.
7. The pump selection is wrong.
8. The pump has been used for too long, damage
and wear to components caused increased
gaps between parts.
1. Damaged oil seal.
1. Oil temperature is too low.
2. Motor, power source or circuit board
malfunctions.
3. Foreign objects entered the pump.
4. Voltage supply is excessively low or high.
5. Overload trips.
1. Excessive oil volume.
2. Inlet port pressure is excessively high for a long
period.
2. Loose or damaged oil box connections.
Remedy
Tighten the cap.
Replace the rubber ring.
Add oil to the center line of the oil display.
Replace with new oil.
Clean the oil entry hole, clean the oil filter.
Inspect the connecting hose gaskets and
system, repair leaks.
Check the size of the container to be evacuated,
recalculate and select an appropriate pump
model.
Inspect and repair, or replace the pump.
Inspect and repair.
Inspect and remove.
Inspect the power source voltage.
After overload trip occurs, switch kept On.
Remove the power plug, wait for approximately
30 seconds before inspecting and reparing.
Replace the oil seal.
Tighten the connecting screws, replace O-rings.
Remove oil until the oil position line is reached.
Select an appropriate pump, increase the
pumping speed.
Exposed the air entry hole to the external
atmosphere, and remove the oil fume filtration
device. Use a screwdriver to turn the engine
axle in an anti-clockwise direction.
repair center. We will do our best to provide you with a quick turnaround to keep you working.
Notes:
1. The pump is inverter driven and the motor has over-current / overload protection, please troubleshoot after
overload resets.
2. If the above methods cannot resolve your problems, please contact your nearest distributor or take the pump to a
0706
