NAVAC N2A4 Pro Plus Manifold Gauge User Manual

pro+ SERIES
N2A4 ,N2A4B
N2A4C ,N2A4D, N2A4E
Pro Plus Manifold Gauge
User Manual

N2A4 Pro Plus Manifold Gauge

Falure to follow warnings could resultin death or serious injury.
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Dear User,
Thank you for choosing NAVAC Product. For best result and proper operation, please read this operating manual carefully before using. We suggest that keeping this manual with the product or a place where you can easily find for later reference.

Safety guide

WARNING
1.1 The manifold has been designed specially to measure pressure in refrigeration equipment. The manifold may only be used by trained technicians.
1.2 It must not be used with pressures higher than the pressure scale indicated on the high-pressure gauge of the manifold.
1.3 Safety goggles and gloves must be worn at all ime during the use of the manifold.
1.4 The gauges are correctly calibrated at the factory before shipment. f calibration is required, remove the plastic plug on a sight glass and insert a small flat screwdriver into the opening to adjusting screw for calibration.
1.5 Clean up the connection interfaces in order to prevent contamination entering to refrigeration system.
1.6 The charging hoses must be checked with oil residue cleaned off before each use. A visible check is also necessary to ensure that the hoses and the connection are undamaged and tight.
1.7 Do not contact refrigerant directly as it may cause personal injury.
1.8 Do not vent refrigerant into the atmosphere.
1.9 The seals and gaskets of the manifold gauges are parts subject to the wear and tear of use, and must therefore be replaced from time to time. The manifold is to be tested regularly to ensure the valves are skintight.
1.10 Make sure to use the right pressure gauge.
1.11 Manifolds are high precision measuring instruments. After use, disconnect all hoses from the system and open valves and then store the manifold always in the carrying case.
1.12 Dispose of the used manifold gauges according to the local rules and regulations.

Parts and Specifications

Technical parameter

-30 inHg to 500 psi
N2A4B|
N2A4C|
N2A4D|
N2A4E|

Operation Instruction

Pressure test
1.1 Close both valves.
1.2 Connect blue hose to the low side of system, connect red hose to the high side of system.
1.3 Run the system, read the testing pressure indicated on manifold gauges.
1.4 After testing, turn off the system. Then disconnect the hoses from the system and open all valves, refrigerant into the atmosphere.
1.5 To avoid de minimis, use NAVAC recovery machine to capture the remaining refrigerant in the hoses and manifold gauge.
Evacuation
2.1 Connect blue hose to the low side of system, connect red hose to the high side of system and connect yellow hose to vacuum pump.
2.2 Open both valves.
2.3 Turn on the vacuum pump.
2.4 Check pressure on low pressure gauge until the desired vacuum is reached, close the valves and turn off the vacuum pump.
2.5 For decay test, observe the pressure on the low-pressure gauge to see if the pointer sticks to -30inHg for a desired decay test time.

Charging a system after evacuation
3.1 Keep valve closed, disconnect the yellow hose from the vacuum pump and connect this hose to a refrigerant container.
3.2 Open valve on the refrigerant container.
3.3 Open the manifold valves. The system is now being charged with refrigerant.
Check the correct quantity of refrigerant with a charging scale (such as a NAVAC NRS2i01 wireless scale), and observe the pressure on the gauge.
If the refrigerant flow is too slow or insufficient, the system compressor can be turned on to speed up the process.
3.4 If the correct charging amount has been reached, close valves.
3.5 After testing, turn off the system. Then disconnect the hoses from the system and open all valves.
3.6 To avoid de minimis, use NAVAC recovery machine to capture the remaining refrigerant in the hoses and manifold gauge.

Maintenance

1.1 Do not apply excessive force when turning valves.
1.2 Manifolds are high precision measuring instruments. After use, always store the manifold gauges in the carry case.
1.3 For maintenance and repair of the manifold, contact authorized NAVAC distributors. Product warranty would be voided if it is disassembled by unauthorized individuals.
1.4 Calibration: Remove calibration cap, then insert a small flat-end screw driver.
Turn clockwise to move pointer down; turn counterclockwise to move pointer up.
Close calibration cap.

NAVAC Inc.
www.NavacGlobal.com
Tel/Fax: +1 877 MY-NAVAC
877 696 2822
MADE IN PRC

Documents / Resources

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