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N.AV.AC
Technical parameter
Model
N2A4
Refriaerant Tvoe
R-22, R-404A, R-134a, R-41 0A
Gauge Diameter
in
<1>3-1/8"
Pressure Range
psi
-30 inHg to 800 psi;
-30 inHg to 500 psi
Hose
in
No
Standard Length
ft
No
Operation lnstruciton
1. Pressure testing
1.1 Close both valves.
N4A4H
R-22, R-404A, R-134a, R-41 0A
<1>3-1/8"
-30 inHg to 800 psi;
-30 inHg to 500 psi
Black 3/8"-3/8"
Red
1/4"-1/4"
Blue 1/4"-1/4"
Yellow 1/4"-1/4"
4x5'
1.2 Connect blue hose to the low side of system, connect red hose to the high
side of system.
1.3 Running 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, make sure not vent refrigerant into the atmosphere.
1.5 In order to prevent venting the refrigerant into the atmosphere, you can use a
NAVAC recovery machine to recover any refrigerant remained in the hoses
or mainfold gauges.
2. Evacuation of a system
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 for 3 to 5 minutes, if desired vacuum
reached, close valves, then turn off the vacuum pump.
2.5 Observe the pressure on the low-pressure gauge, if the pointer sticks to
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-30 inHG for 3 to 5 minutes, the system evacuation is completed. If not, repeat
the steps from 2.2 to 2.4.
Empowering you to work smarter
N.AV.AC
3. Charging of 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 quantity has been reached, close valves.
3.5 After testing, turn off the system. Then disconnect the hoses from the system
and open all valves while making sure not to vent refrigerant into the
atmosphere.
Maintenance
1.1 Do not apply excessive force when turning valves.
1.2 Manifolds are high precision measuring instruments. After use, store manifold
gauges always in the carrying case.
1.3 For maintenance and repair of the manifold, contact authorized NAVAC
distributors. Product warranty would be void if it is disassembled by
unauthorized individuals.
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