NAVAC NP12DA1 Ammonia Vacuum Pump User Manual
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Product Overview
The NAVAC NP12DA1 is a two-stage rotary vane vacuum pump designed for evacuating sealed HVACR systems, removing air, moisture, and other non-condensables. It is suitable for both repair and new installations of ammonia (NH3) systems, as well as systems using refrigerants like CFC, HFC, HCFC, and HCEF (e.g., R-12, R-22, R-410A, R-404A, R-32, R-134A, R-1234yf).
Key Features:
- Oil-lubricated for sealing, cooling, and vane reliability.
- Large oil sight glass for easy monitoring of oil level.
- Anti-spark design suitable for R-32 and 1234yf refrigerants.
Technical Specifications
| Model | NP12DA1 |
|---|---|
| Power Supply | 115V/60Hz |
| Flow Rate | 12 CFM |
| Ultimate Vacuum | 5 Micron |
| Motor Power | 1/2 HP |
| Oil Reservoir Capacity | 28 oz (828ml) |
| Dimensions (in) | 16.3"x6"x12.1" |
| Weight | 32 lbs (14.5kg) |
| Inlet Port | KF25 |
Usage Instructions
Before using the vacuum pump, ensure the power supply matches the rating on the nameplate. Always turn off the pump before connecting it to the power source. Check and maintain the oil level as recommended.
Steps for Use:
- Remove the inlet port cap and connect the pump to the system or piping to be evacuated. Use the shortest possible hoses for faster evacuation.
- Inspect all connection hoses and fittings for leaks.
- During evacuation, open the GAS BALLAST (air ballast) and close it when the vacuum gauge reaches 2000 microns.
- Once evacuation is complete, stop the pump and close the system access valves.
- Turn off the pump and disconnect the power.
- Remove the evacuation hoses.
- Replace the air inlet cap and exhaust cap to prevent dirt or particles from entering the pump.
Important Notes:
- Always use a micron gauge (e.g., NAVAC NMV1) for accurate evacuation monitoring.
- Monitor the oil level during operation. If it drops below the midpoint, add oil immediately to prevent pump damage.
- The pump and oil should be above 30°F (-1°C) for operation.
- Do not expose the pump to rain. Store indoors.
- When using extension cords, ensure they are properly rated (16 AWG or larger) and in good condition.
Indoor and Outdoor Use:
The pump can be used indoors. For outdoor use, or when evacuating non-corrosive refrigerants, an oil mist filter (NF43, sold separately) can be attached to the exhaust port.
Maintenance
Pump oil lubricates, cools, and seals the pump. It absorbs moisture from the system, reducing its effectiveness. Regular oil changes are crucial for optimal performance and to achieve required vacuum levels. NAVAC vacuum pump oil is recommended for its consistent viscosity and cold-start performance. If NAVAC oil is unavailable, use other reputable brands.
Oil Change Procedure:
- Run the pump for about a minute to warm the oil before changing.
- Open an inlet port to allow oil to drain while the pump is running.
- After turning off the pump, open the drain plug to empty the used oil into an appropriate container for disposal according to local regulations.
- Tilt the pump to drain any remaining oil.
- Replace and tighten the drain plug.
- Add new oil to the appropriate level, as indicated by the sight glass.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Low Vacuum | Loose inlet air cap, damaged O-ring, insufficient oil, dirty oil, clogged oil inlet, leaks in system hoses or manifold, incorrect pump selection, worn internal parts. | Tighten cap, replace O-ring, add oil, replace oil, clean inlet, check for leaks, select correct pump, repair/replace pump. |
| Oil Leak | Damaged oil seal, loose or damaged oil reservoir connections. | Replace oil seal, tighten connections, replace gaskets. |
| Oil Spraying | Excessive oil volume, high inlet pressure for extended periods, low oil temperature. | Drain oil to correct level, use appropriate pump for the job, warm the pump before use. |
| Startup Problems | Motor issues, power supply or circuit board problems, foreign objects in pump, incorrect voltage, overload trip. | Check motor, power supply, and circuit board. Remove foreign objects. Verify voltage. Reset overload protection. |
If problems persist, contact your nearest distributor or a qualified repair center.
Warranty Conditions
NAVAC products are covered by a two-year warranty against manufacturing defects. To qualify for warranty service, the product must:
- Have manufacturing defects confirmed by qualified representatives.
- Not have been serviced or disassembled by unauthorized third parties.
- Be used in accordance with the user manual.
NAVAC is not responsible for costs associated with problem resolution, refrigerant consumption, disposal costs, or unauthorized labor and shipping.
Exploded View and Parts List
Refer to the provided diagrams for an exploded view of the pump components and a detailed list of replacement parts with their corresponding part numbers.
Dimensions
| Model | A | A1 | A2 | B | B1 | H | H1 |
|---|---|---|---|---|---|---|---|
| NP12DA1 | 16.3 in | 10.8 in | 3.5 in | 6 in | 4.7 in | 12.1 in | 8.2 in |
Safety Precautions
WARNING: This machine is intended for refrigerant system evacuation only after the refrigerant has been removed and the system is open to the atmosphere. Do not use as a transfer pump for liquids or other fluids.
- Never connect the vacuum pump to a pressurized system. Ensure system and piping pressure is not above atmospheric pressure.
- Wear safety glasses when handling refrigerants.
- Avoid direct physical contact with refrigerants to prevent frostbite.
- Ensure all equipment is properly grounded to prevent electrical shock.
- The pump surface will be hot during operation. Do not touch the oil reservoir or motor housing. Allow adequate ventilation.
- If using flammable refrigerants (R-32, 1234yf), use an explosion-proof electrical outlet.
- Keep the pump dry and away from water, mud, and dirt.
- Do not operate the pump with open suction fittings to the ambient environment for more than 3 minutes.
- Operating ambient temperature range is 30°F to 104°F (-1°C to 40°C).
- The pump requires a 110V ±10% power supply with a grounded outlet.
- Before connecting to an AC system, properly remove refrigerant from pressurized systems using a recovery machine. Pumping high-pressure refrigerants will damage the pump.
- Ensure proper grounding. If the grounding plug is not suitable for the outlet, have a qualified electrician install a proper outlet. Do not modify the plug.
- If the grounding wire is not properly connected, there is a risk of electric shock. The grounding wire is typically green or green with yellow stripes.
