A
A1
A3
A2
H
B2
B1
H1
B
07
06
V. 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 o-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 o-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 battery, wait for approximately 30
seconds before inspecting and repairing.
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.
Warm up the pump.
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. We will
do our best to provide you with a quick turnaround to keep you working.
Requirements For Warranty Coverage
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:
1. Products issues due to manufacturing defects confirmed by qualified agents.
2. Products which have not been maintained or dismantled by unauthorized parties.
3. Products that have been used in accordance with the User Manual. All maintenance services shall
be performed during the warranty period.
Statement: Other than repairing the defective product , the manufacturer of this product will not be
liable for any other costs, such as time spent in fixing the issue, refrigerant consumption,
refrigerant disposal costs, as well as unauthorized transportation and labor costs.
VI. Dimension
Model
NP2DLM
A
A1
A2
A3
B
B1
B2
H
H1
9.6"
7.7"
4.9"
2.8"
3.5"
2.2"
2.4"
7.6"
5.9"
NP4DLM
12.8"
10.3"
7.4"
3.2"
4.8"
4.4"
2.8"
9.5"
7.1"