NAVAC NP12DM Vacuum Pump User Manual

Introduction and Technical Information

This section provides an overview of the vacuum pump components and technical specifications.

Pump Components

The vacuum pump features the following components:

• Gas ballast valve
• Oil mist filter
• Oil tank
• Oil lens
• Oil drain plug
• Handle
• Inlet
• Power switch
• Rear cover
• Motor
• Base

Technical Specifications: DC Inverter Drive Vacuum Pumps

Application

NAVAC inverter drive dual-stage rotary vane vacuum pumps are designed for removing air, moisture, and other non-condensables from sealed HVACR systems. They are suitable for evacuation during HVACR repair and new installations, compatible with refrigerants including CFC, HFC, HCFC, and HCEF, such as R-12, R-22, R-410A, R-404A, R-32, R-134A, and 1234yf.

Special Features

• Forced oil lubrication ensures vane sealing, cooling, and high reliability.
• A large, easy-to-see oil-level window helps prevent oil supply shortage.
• Non-sparking design, suitable for R-32 and 1234yf refrigerants.

Industrial Grade Design

Preparation Prior to Using Vacuum Pump

1. Verify the power supply voltage matches the nameplate.
2. Ensure the pump is switched off before connecting to the power source.
3. Check for proper oil level; change if needed.
4. Remove the oil fill cap and fill oil to the level between the two oil sight glass lines. Add oil slowly to prevent spilling. Refer to the technical specification table for specific pump oil volume.

After switching on the power, let the pump run for approximately one minute. Check the oil level again. If it's too low, switch off the machine, add more oil, and reinstall the cap. The oil level should remain between the two position lines during operation. Too low an oil level reduces performance and can damage vanes; too high an oil level can cause oil discharge through the exhaust.

Grounding Instructions

This product must be grounded to reduce the risk of electric shock in case of a short circuit. It is equipped with a cord having a grounding wire and an appropriate grounding plug. The plug must be inserted into a properly installed and grounded outlet, in accordance with all local codes and ordinances.

Warning: Improper installation of the grounding plug can lead to electric shock. If repair or replacement of the cord or plug is needed, do not connect the grounding wire to either flat blade terminal. The grounding wire is typically green or green with yellow stripes. Consult a qualified electrician if unsure about grounding.

Diagram Description: A diagram illustrates a standard three-prong electrical outlet with a grounding slot, and a power cord with a grounding pin designed to connect to it.

Safety Warnings

• This machine is intended only for evacuating refrigerant systems after refrigerant has been removed and the system is open to atmosphere. It is not a transfer pump for liquids or other media.
• Never connect a vacuum pump to a pressurized system. Always ensure system and piping pressure is NOT ABOVE ATMOSPHERIC PRESSURE.
• Wear eye protection (safety glasses or goggles) when handling refrigerants.
• Avoid direct physical contact with refrigerants to prevent burns.
• Ensure all equipment is grounded when connecting the power source to prevent electrical hazards.
• Pump surfaces can be hot during operation; avoid touching the oil box or motor case. Ensure adequate ventilation.
• For R-32, 1234yf, or other flammable refrigerants, use an explosion-proof electrical outlet.
• Keep the pump dry and away from water, mud, and dirt.
• Operating the pump with intake fittings open to the atmosphere must not exceed 3 minutes.
• Recommended ambient temperature range: 30°F to 104°F (-1°C to 40°C). For lower temperatures, warm up the pump indoors and run for 1 minute before system evacuation.
• The pump requires 115V±10% power, and the outlet must be grounded.
• Before connecting to an A/C-R system, properly remove refrigerant from pressurized systems using a recovery machine. Pumping refrigerants under high-pressure conditions can damage the pump.

Note: NAVAC vacuum pumps are NOT ALLOWED TO BE USED FOR A3 OR FLAMMABLE REFRIGERANTS.

Use Guide

Diagram Description: A diagram shows the vacuum pump's inlet ports, indicating 1/4", 3/8", and 1/2" sizes.

1. Remove the inlet protection cap from the desired connecting port (1/4", 3/8", or 1/2") and connect the pump to the system or piping to be evacuated. Use the shortest hoses possible for faster and more thorough evacuation.
2. Inspect hose connections and all connecting hoses for proper seal. Leaks will prevent achieving the required deep vacuum level.
3. At the beginning of evacuation, open the GAS BALLAST. Once the vacuum gauge reaches 2000 microns, retighten to achieve the desired vacuum level.
4. After evacuation is complete, shut down the pump and close the system access valves.
5. Turn off the power switch and disconnect power.
6. Remove the evacuation hoses.
7. Close the air entry cap and air exhaust cap (if applicable) to prevent dirt or particulates from entering the pump.

Notes:

• Always use a micron vacuum gauge (e.g., NAVAC NMV1) for precise measurement and display of system evacuation.
• Monitor the oil level during operation. If it falls below the center line, add vacuum pump oil immediately to prevent pump damage.
• The vacuum pump and oil must be kept above 30°F (-1°C).

Caution: To reduce the risk of electric shock, do not expose to rain. Store indoors.

Extension Cords

If an extension cord is necessary, ensure it meets the following criteria:

• It is a 3-wire extension cord with a 3-blade grounding plug and a 3-slot receptacle.
• It is in good condition.
• It is no longer than 50 feet (15.2m).
• It is 16 gauge (AWG) or larger (14 AWG and 12 AWG are also acceptable; DO NOT use 18 AWG).

Notice: Using an undersized extension cord can cause voltage drop, leading to power loss and motor overheating.

Maintenance

Vacuum pump oil serves three primary functions: lubrication, cooling, and sealing. During evacuation, the oil absorbs moisture from the system, which can reduce its effectiveness and potentially cause the pump to overheat. For optimal performance and to achieve required vacuum levels, it is crucial to use clean oil. NAVAC recommends changing the oil just before evacuating each A/C-R system.

Use NAVAC vacuum pump oil or reputable brands of special-purpose vacuum pump oil. If the pump oil becomes opaque, dirty, or contains moisture, change it promptly, as this will significantly speed up evacuation, especially in systems with high moisture content.

Oil Change Procedure:

1. Run the pump for approximately one minute to warm the oil. Do not run for longer than necessary to avoid pump damage.
2. While the pump is running, open one inlet port to allow oil to drain. After turning off the pump, open the oil drain plug and drain the used oil into an appropriate vessel for proper disposal.
3. Tip the pump to drain any remaining oil.
4. Close the oil drain valve.
5. Remove the oil fill cap and pour in new oil until the level reaches the proper mark in the sight glass, following the same procedure as initial filling.

Diagram Description: An illustration shows the location from which oil drains out of the pump.

Requirements for Warranty Coverage

NAVAC provides a two-year warranty for product quality problems from the date of sale. To ensure warranty validity, the following conditions must be met:

• Product issues must be confirmed as manufacturing defects by qualified agents.
• Products must not have been maintained or dismantled by unauthorized parties.
• Products must have been used in accordance with this User Manual. All maintenance services must be performed during the warranty period.

Statement: The manufacturer is not liable for any costs beyond product repair, such as time spent on fixes, refrigerant consumption, disposal costs, or unauthorized transportation and labor costs.

Troubleshooting

This table outlines common malfunctions, their possible causes, and recommended remedies.

Notes:

• The pump is inverter driven and has motor over-current/overload protection. Troubleshoot after overload resets.
• If problems persist, contact your nearest distributor or a repair center.

Exploded View

Diagram Description: A detailed exploded view diagram illustrates all the components of the vacuum pump disassembled, with each part identified by a number.

Repair Parts List

Dimension

Diagram Description: Front and side views of the vacuum pump are shown with key dimensions labeled A, A1, A2, B, B1, H, and H1.

Unit: inch