NAVAC NP7DP2 Vacuum Pump PRO Series User Manual

NAVAC NP7DP2 Vacuum Pump PRO Series

INTRODUCTION AND TECHNICAL INFORMATION

In order to make it easier to understand the components of the vacuum pump, please see the
picture below

AC MOTOR DRIVEN VACUUM PUMPS

APPLICATION

NAVAC dual-stage rotary vane vacuum pumps are used to remove air, moisture, and other noncondensablesfrom sealed HVACR systems. The products can be used for evacuation of HVACR
repair and new installations, specially designed for A2L refrigerants such as, R-32, 1234yf, R-600a,R-452B. It can also be used as other common refrigerants such as, R-12, R-22, R-410A, R-404A, R-134A, etc.

SPECIAL FEATURES

• Integrated pump structure, high precision, for deep ultimate vacuum level.
• Forced oil lubrication ensures vane sealing, cooling and high reliability.-
• Large and easy to see oil-level window design help prevent oil supply shortage

PREPARATION PRIOR TO USING VACUUM PUMP

GROUNDING INSTRUCTIONS

This product must be grounded. In the event of an electrical short circuit, grounding reduces the risk ofelectric shock by providing an escape wire for the electric current. This product is equipped with a cord having a grounding wire with an appropriate grounding plug. The plug must be plugged into an outletthat is properly installed and grounded in accordance with all local codes and ordinances.

WARNING

Improper installation of the grounding plug is able to result in a risk of electric shock. When repair orreplacement of the cord or plug is required, do not connect the grounding wire to either flat blade terminal. The wire with insulation having an outer surface that is green with or without yellow stripes isthe grounding wire. Check with a qualified electrician or serviceman when the grounding instructions are not completely understood, or when in doubt as to whether the product is properly grounded. Do not modify the plugprovided; if it does not fit the outlet, have the proper outlet installed by a qualified electrician.

Switch on the power and the pump will begin to operate. After running for approximately one minute, check the oil level. If the oil level is too low, switch off the machine and add the required extra oil. Reinstall the oil fill cap.
Note:   While the pump is operating, the oil level should be in between the two oil position lines. If the oil level is too low, it will reduce the performance and could damage the pump vanes. If the oil level is too high, it could cause oil to discharge through the pump exhaust

SAFETY WARNINGS

WARNING:
This machine should only be used for evacuation of refrigerant systems after refrigerant has been removed from the system and the system has been opened to atmosphere. This machine is not to be used as a transfer pump for liquids or any other media; doing so can damage the product.
Note: In order to avoid personal injury, please carefully read and follow the instructions in this user manual and the user guide of the pump.
NAVAC VACUUM PUMPS ARE NOT ALLOWED TO BE USED FOR A3 OR FLAMMABLE REFRIGERANTS.

1. NEVER CONNECT A VACUUM PUMP TO A PRESSURIZED SYSTEM. Always check to make ure that system and piping pressure is NOT ABOVE ATMOSPHERIC PRESSURE.
2. When handling refrigerants, please wear an eye-protection such as safety glasses or goggles.
3.  Avoid direct physical contact with refrigerants, you will get burned.
4. When connecting the power source, all equipments must be grounded in order to preventelectrical hazards.
5.  When the pump is in operation, the enclosure surfaces will be hot. Do not touch the oil box or themotor case. Allow adequate ventilation space for heat dissipation.Not applicable for flammable refrigerants in A2 and A3classes.
6. Keep pump dry and away from water, mud, and dirt at all times.
7.  Operating pump with intake fittings open to the atmosphere must not exceed 3 minutes.
8. Ambient temperature range for pump use is 30 to 104°F (-1°C~40°C). The pump can be used inlower ambient conditions, if warmed up inside first and run for no more than 1 minute to warm theoil prior to system evacuation.
9. The power outlet must be grounded.
10. Prior to connecting the vacuum pump to an A/C-R system, please use proper methods toremove refrigerant from a pressurized system. Note that pumping refrigerants underhigh-pressure conditions will damage the pump, and refrigerant must be removed using arecovery machine designed for that purpose.

USE GUIDE

EXTENSION CORDS

1. If an extension cord must be used, be sure it is:A 3-wire extension cord that has a 3-blade grounding plug, and a 3-slot receptacle that will acceptthe plug on the product

2.  In good condition

3.  No longer than 50′ (15.2m)

4. 16 gauge (AWG) or larger. (Wire size increases as gauge number decreases. 14 AWG and12AWG may also be used. DO NOT USE 18 AWG )

5. NOTICE: Risk of Property Damage. The use of an undersized extension cord will cause voltage to
   drop resulting in power loss to the motor and overheating.

6. When using the vacuum pump, remove the inlet protection cap from the desired (1/4″, 3/8″, or 1/2″)connecting port, as shown in the diagram above, and connect the pump to the system or piping to beevacuated. Use shortest hoses possible for faster and more thorough evacuation.

7. Inspect the hose inlet connection, as well as all connecting hoses for proper seal. There must beno leakage or it will be impossible to draw the required deep vacuum level.

8. At the beginning of the evacuation process, open the GAS BALLAST, and once the vacuum gauge reaches 2000 microns, retighten to achieve desired vacuum level.

9. After evacuation is completed, shut down the pump and close the system access valves.

10. Turn off the power switch on the pump and disconnect power.

11.  Remove the evacuation hoses.

12.  Close the air entry cap and the air exhaust cap tightly (with the exception of models without air exhaust cap), to prevent dirt or particulates from entering the pump.

Note:

1. Always evacuate systems in conjunction with a micron vacuum gauge, such as the NAVAC NMV1, giving you a comprehensive view of the sealed system internal evacuation condition.
2.  Please pay attention to any changes in the oil level during pump operation. If the oil level fallsbelow the center line, immediately add more vacuum pump oil to avoid damage to the pump.
3. Vacuum pump and oil must be above 30℉.

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 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 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.

Note: Should the pump oil become opaque, dirty, or full of moisture, promptly change oil. This will 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.

1. Oil change procedure: To ensure that the pump and oil are warm, run pump for approximately one minute prior tochanging oil. Do not run longer than this, as it may be possible to damage the pump.
2. While the pump is running, open one inlet port and allow oil to drain out of the pump. After turning off pump, open the oil drain plug, and drain used oil into an appropriate vessel and dispose ofproperly.
3. As oil stops draining, tip the pump to drain any remaining oil in the bottom of the pump.
4. Close oil drain valve.
5.  Remove oil fill cap, pour in new oil until the oil is at the proper level in the sight glass (the sameprocedure prior to using the pump above).

REQUIREMENTS FOR WARRANTY COVERAGE

1. Product warranty is provided for product quality problems for one years from date of sale. Forwarranty to be valid, the following conditions must be met: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 shallbe performed during the warranty period.
   Statement: Other than repairing the product defective, 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

TROUBLESHOOTING

Low Vacuum

| 1. Secondary air inlet connection cap loose on the air inlet port.| Tighten the cap.
2. Damaged rubber ring inside the secondary air inlet connection cap.| Replace the rubber ring.
| Add oil to the center line of the oil display.
4. Pump oil becomes opaque or absorbed too many impurities.| Replace with new oil.
| Clean the oil entry hole, clean the oil filter.
6. The pump connecting hoses, manifold or system has a leak.| Inspect the connecting hose gaskets and system, repair leaks.

7. The pump selection is wrong.

| Check the size of the container to be evacuated, recalculate and select an appropriate pump model.
8. The pump has been used for too long, damage and wear to components caused increased gaps between parts.| ****

Inspect and repair, or replace the pump.

Oil leak

| 1. Damaged oil seal.| Replace the oil seal.
2. Loose or damaged oil box connections.| Tighten the connecting screws, replace O-rings.

Oil spray

| 1. Excessive oil volume.| Remove oil until the oil position line is reached.
2. Inlet port pressure is excessively high for a long period.| Select an appropriate pump, increase the pumping speed.

Start-up problems

| 1. Oil temperature is too low.| Place the vacuum pump in an over 77°F ambient environment for an hour, or replace in the 77°F oil.
2. Motor, power source or circuit board malfunctions.| Inspect and repair.
3. Foreign objects entered the pump.| Inspect and remove.
4. Voltage supply is excessively low or high.| Inspect the power source voltage.
5. Overload trips.| Afterr overload trip occurs, turn off the switch. Romove the power plug. Examine and solve the issue.

Notes:

1. The pump 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 arepair center. We will do our best to provide you with a quick turnaround to keep you working.

EXPLODED VIEW

REPAIR PARTS LIST

DIMENSION

Unit: inch

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