The NAVAC N2A4 and N4A4H Manifold Gauges are high-precision measuring instruments designed specifically for measuring pressure in refrigeration equipment. These devices are intended for use by trained technicians and are not suitable for applications other than refrigeration, nor for liquids or gases not indicated on the gauge.
Function Description:
The primary function of the manifold gauges is to measure pressure in refrigeration systems, facilitate system evacuation, and assist in charging refrigerant. The manifold includes both high-pressure and low-pressure gauges, allowing for comprehensive monitoring of system pressures. Key components include a hook for hanging, caps, zero adjusting screws for calibration, sight glasses, high and low-pressure valves, hose holders, and a refrigerant tank valve. The N4A4H model also includes a set of color-coded hoses (black, blue, yellow, red) for different connections.
Important Technical Specifications:
- Models: N2A4, N4A4H
- Refrigerant Types: R-22, R-404A, R-134a, R-410A
- Gauge Diameter: ΦЗ-1/8"
- Pressure Range:
- High Pressure: -30 inHg to 800 psi
- Low Pressure: -30 inHg to 500 psi
- Hose (N4A4H only):
- Black: 3/8"-3/8"
- Red: 1/4"-1/4"
- Blue: 1/4"-1/4"
- Yellow: 1/4"-1/4"
- Standard Length (N4A4H only): 4x5'
Usage Features:
- Safety First: Users must wear safe goggles and gloves at all times during use. Direct contact with refrigerant should be avoided to prevent personal injury.
- Calibration: Gauges are factory-calibrated. If recalibration is needed, a small flat screwdriver can be inserted into the adjusting screw through the plastic plug on the sight glass.
- Connection Interfaces: All connection interfaces must be cleaned to prevent contamination of the refrigeration system. Charging hoses should be checked for oil residue and damage before each use.
- Pressure Testing:
- Close both manifold valves.
- Connect the blue hose to the low side of the system and the red hose to the high side.
- Run the system and read the testing pressure on the gauges.
- After testing, turn off the system. Disconnect hoses and open all valves, ensuring no refrigerant is vented into the atmosphere.
- A NAVAC recovery machine can be used to recover any refrigerant remaining in the hoses or manifold gauges to prevent venting.
- System Evacuation:
- Connect the blue hose to the low side of the system, the red hose to the high side, and the yellow hose to a vacuum pump.
- Open both manifold valves.
- Turn on the vacuum pump.
- Monitor the low-pressure gauge for 3 to 5 minutes. Once the desired vacuum is reached, close the valves and turn off the vacuum pump.
- Observe the low-pressure gauge; if the pointer remains at -30 inHg for 3 to 5 minutes, evacuation is complete. If not, repeat the process.
- System Charging:
- Keep the manifold valves closed. Disconnect the yellow hose from the vacuum pump and connect it to a refrigerant container.
- Open the valve on the refrigerant container.
- Open the manifold valves to begin charging the system.
- Use a charging scale (e.g., NAVAC NRS2i01 wireless scale) to verify the correct quantity of refrigerant and observe the pressure on the gauge. If the flow is too slow, the system compressor can be turned on to speed up the process.
- Once the correct charging quantity is reached, close the valves.
- After testing, turn off the system. Disconnect the hoses and open all valves, again ensuring no refrigerant is vented.
- Refrigerant Handling: Do not vent refrigerant into the atmosphere. Dispose of used manifold gauges according to local rules and regulations.
Maintenance Features:
- Valve Operation: Do not apply excessive force when turning the valves to prevent damage.
- Storage: Manifolds are high-precision instruments and should always be stored in their carrying case after use to protect them.
- Wear and Tear Parts: The seals and gaskets are subject to wear and tear and must be replaced periodically. Regular testing is recommended to ensure the valves remain tight.
- Professional Service: For maintenance and repair, contact authorized NAVAC distributors. Disassembly by unauthorized individuals will void the product warranty.
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