Page 1
MANIFOLD GAUGE
N2A4A
User Manual
Failure to follow warnings could
result in death or serious injury.
SAVE THIS MANUAL
FOR FUTURE REFERENCE
Page 2
Safety guide
Parts and specifications
Technical parameter
Operation instruction
Maintenance
CONTENT
01
02
03
03
04
Safety Guide
WARNING
1.1
1.2
1.3
1.4
1.5
1.6
Dear User,
Thank you for choosing NAVAC Product. For best result and right way to use
it, please read this operating manual carefully before using. We suggest that
you’d better keep this manual with the product or a place where you can
easily find for later reference.
1.7
1.8
1.9
1.10
1.11
1.12
1.13
01
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Parts and Specifications
Technical parameter
NO.
1
2
3
4
5
10
9
NameName
Hook
High pressure gauge
Cap
Zero adjusting screw
Sight glass
NO.
6
7
8
9
10
High pressure valve
Low pressure valve
Hose connector
Low pressure gauge
Sheath
Model
Refrigerant Type
Gauge Diameter
Pressure Range
Hose
N2A4A
R-134a
Φ3-1/8"
-30 inHg to 800 psi
-30 inHg to 500 psi
No
R-22
R-410AR-32
Operation Instruciton
1. Pressure testing
1.1
Close both valves.
Connect blue hose to the low side of system, connect red hose to the high
1.2
side of system.
Run the system, read the testing pressure indicated on manifold gauges.
1.3
After testing, turn off the system. Then disconnect the hoses from the system
1.4
and open all valves, make sure not vent refrigerant into the atmosphere.
In order to prevent venting the refrigerant into the atmosphere, you can use a
1.5
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.
Open both valves.
2.2
Turn on the vacuum pump.
2.3
2.4
Check pressure on low pressure gauge for 3 to 5 minutes, i
f the desired
vacuum is reached, close the valves and turn off the vacuum pump.
2.5
Observe the pressure on the low-pressure gauge, if the pointer sticks to
-30 inHg for 3 to 5 minutes, the system evacuation is completed. If not, repeat
the steps from 2.2 to 2.4.
02
03
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3. Charging a system after evacuation
Keep valve closed, disconnect the yellow hose from the vacuum pump and
3.1
connect this hose to a refrigerant container.
Open valve on the refrigerant container.
3.2
Open the manifold valves. The system is now being charged with refrigerant.
3.3
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.
If the correct charging amount has been reached, close valves.
3.4
After testing, turn off the system. Then disconnect the hoses from the system
3.5
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.
Manifolds are high precision measuring instruments. After use, always store the
1.2
manifold gauges in the carry case.
For maintenance and repair of the manifold, contact authorized NAVAC
1.3
distributors. Product warranty would be voided if it is disassembled by
unauthorized individuals.
04
05
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