NAVAC NP5DP & NP7DP Vacuum Pump User Manual

Introduction and Technical Information

This section provides an overview of the vacuum pump components. Refer to the diagram for identification.

Components: Gas ballast valve, Oil mist filter, Oil reservoir, Oil sight glass, Oil drain plug, Base, Handle, Inlet, Power switch, Rear cover, Motor, Inlet port.

Vacuum Pumps Driven by an Alternating Current Motor

Application

NAVAC two-stage rotary vane vacuum pumps are used to remove air, moisture, and other non-condensable substances from sealed HVACR systems. They are suitable for evacuation during repairs and new installations of HVACR systems with refrigerants.

Special Features

• Integrated pump structure for high precision and deep ultimate vacuum.
• Forced oil lubrication ensures vane sealing, cooling, and high reliability.
• A wide and easily visible oil level sight glass helps prevent oil supply shortages.

Preparation Before Using the Vacuum Pump

Grounding Instructions

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

WARNING: Improper installation of the equipment-grounding conductor can result in a risk of electric shock. When repairing or replacing the cord or plug, do not connect the grounding conductor to either of the flat blade terminals. The wire whose outer surface is green with or without yellow stripes is the grounding conductor.

Consult a qualified electrician or serviceman if the grounding instructions are not completely understood, or if in doubt as to whether the apparatus is properly grounded. Do not modify the supplied plug; if it does not fit the outlet, have a proper outlet installed by a qualified electrician.

Grounding Terminal

Grounding Pin

Operating Instructions

1. Verify that the electrical supply used corresponds to the voltage indicated on the nameplate.
2. Ensure the pump is turned off before connecting it to the power supply.
3. Check the oil level and change if necessary.
4. Remove the oil filler plug and fill with oil up to the level between the two lines on the oil sight glass. Refer to the technical specifications table for the specific oil volume for your pump.

Note: To prevent oil spillage, add oil slowly.

Turn on the power and the pump will start operating. After about one minute of operation, check the oil level. If the oil level is too low, stop the machine and add more oil as needed. Reinstall the oil filler plug.

Note: When the pump is operating, the oil level should be between the two oil position lines. Too low an oil level will reduce performance and may damage the pump vanes. If the oil level is too high, oil may be expelled through the pump's exhaust.

Safety Warnings

WARNING: This machine is only to be used for evacuating refrigeration systems after the refrigerant has been removed from the system and the system has been opened to the atmosphere. This machine must not be used as a pump for transferring liquids or other fluids, as this may damage the product.

Note: To avoid injury, please read and follow the instructions in this manual and the pump's operating guide carefully.

NAVAC VACUUM PUMPS CANNOT BE USED FOR REFRIGERANTS OR FLAMMABLE SUBSTANCES.

1. NEVER CONNECT A VACUUM PUMP TO A PRESSURIZED SYSTEM. Always ensure that the system and piping pressure is NOT HIGHER THAN ATMOSPHERIC PRESSURE.
2. When handling refrigerants, wear eye protection such as safety glasses.
3. Avoid direct physical contact with refrigerants, as this can cause frostbite.
4. When connecting the power supply, all equipment must be grounded to prevent electrical hazards.
5. When the pump is running, the housing surfaces are hot. Do not touch the oil reservoir or motor housing. Ensure adequate ventilation space for heat dissipation.
6. Does not apply to R-32, 1234yf, or other flammable refrigerants.
7. Keep the pump dry and away from water, mud, and dirt at all times.
8. Operating the pump with open suction fittings to the atmosphere should not exceed 3 minutes.
9. The ambient temperature for pump operation is between -1°C and 40°C (30°F and 104°F). The pump can be used at lower ambient temperatures if it is first warmed up indoors and operated for no more than one minute to warm the oil before system evacuation.
10. The power outlet must be grounded.
11. Before connecting the vacuum pump to an A/C-R system, use appropriate methods to remove refrigerant from a pressurized system. Note that pumping refrigerants under high pressure will damage the pump, and

Operating Guide

Electrical Extensions

If an extension cord must be used, ensure that it is:

• A 3-wire cord with a 3-prong grounding plug and a 3-slot receptacle that accepts the appliance plug.
• In good condition.
• No longer than 15.2 m (50 ft).
• Gauge 16 (AWG) or heavier. (Wire size increases as gauge number decreases. 14 AWG and 12 AWG may also be used. DO NOT USE 18 AWG)

NOTICE: Risk of material damage. Using an undersized extension cord will result in overheating.

Vacuum Pump Operation

1. When using the vacuum pump, remove the protective cap from the desired connection port (1/4", 3/8", or 1/2"), as shown in the diagram above, and connect the pump to the system or piping to be evacuated. Use the shortest possible hoses for faster and more complete evacuation.
2. Check the connection of the hose inlet, as well as all connecting hoses, for leaks. There should be no leaks, otherwise, it will be impossible to achieve the required deep vacuum level.
3. At the beginning of the evacuation process, open the GAS BALLAST and once the vacuum gauge reaches 2000 microns, close it to achieve the desired vacuum level.
4. Once evacuation is complete, stop the pump and close the system access valves.
5. Turn off the pump switch and unplug the power cord.
6. Remove the evacuation hoses.
7. Seal the air inlet cap and air outlet cap tightly (except for models without an air outlet cap) to prevent dirt or particles from entering the pump.

Note:

• Always evacuate systems using a micron gauge, such as the NAVAC NMV1, which provides an overview of the internal evacuation status of the sealed system.
• Pay attention to any variation in the oil level during pump operation. If the oil level drops below the center line, immediately add vacuum pump oil to prevent pump damage.

Maintenance

Vacuum pump oil serves three primary functions: lubrication, cooling, and sealing of the pump. During the evacuation process, the pump oil absorbs moisture extracted from the system, making it less effective as a lubricant and seal for the pump vanes, prolonging evacuation time, and potentially causing the pump to overheat. It is recommended to drain the oil just before evacuating each A/C-R system to ensure the pump oil is clean, as this is the key factor in determining if the pump can achieve the required vacuum levels. To maintain optimal pump performance, NAVAC vacuum pump oil is recommended. This oil is manufactured using a unique process and can maintain proper viscosity during operation and normal temperatures, and it is also useful for cold starts. If NAVAC oil is not available, reputable brands of specialty vacuum pump oil may be used.

Note: If the pump oil becomes cloudy, dirty, or moisture-laden, it should be changed promptly. This will significantly speed up evacuation, especially when the system piping contains a lot of moisture because it has been open to the atmosphere for an extended period.

Oil Draining Procedure:

1. To ensure the pump and oil are warm, run the pump for about one minute before draining. Do not run it longer, as you risk damaging the pump.
2. While the pump is running, open an inlet port and allow the oil to drain from the pump. After stopping the pump, open the oil drain plug and drain the used oil into an appropriate container and dispose of it properly.
3. When the oil stops flowing, tilt the pump to drain any remaining oil from the bottom of the pump.
4. Close the oil drain valve.
5. Remove the oil filler plug, pour in new oil until the oil level is correct in the sight glass (same procedure as before using the pump, detailed above).

Warranty Coverage Requirements

The product warranty covers product quality issues for one year from the date of sale. For the warranty to be valid, the following conditions must be met:

1. Product issues due to manufacturing defects confirmed by qualified agents.
2. Products that have not been maintained or disassembled by unauthorized parties.
3. Products that have been used in accordance with the user manual. All maintenance services must be performed during the warranty period.

Disclaimer: In addition to the repair of defective products, the manufacturer of this product will not be liable for other costs, such as time spent resolving the issue, refrigerant consumption, refrigerant disposal costs, and costs associated with

Troubleshooting

Notes:

• The pump is equipped with overcurrent and overload protection; please resolve the issue after the overload resets.
• If the above methods do not solve the problem, please contact your nearest distributor or send the pump to a repair center. NAVAC will do its best to provide prompt service so you can continue working.

Exploded View

Diagram showing the exploded components of the vacuum pump with reference numbers.

Parts List

Dimensions

Dimensions are provided in inches.