NAVAC N2D72 Manifold Gauge Digital Display User Manual

NAVAC N2D72 Manifold Gauge Digital Display

Safety Instruction

Safety Guide

1. Do not use the product in dangerous places or on a moving object.
2. Only qualified service personnel should maintain and repair this product. 1.3 If the product gets external collision or falls to the ground, it may be damaged or cause damage of refrigerant hoses. It is recommended to check up the manifold gauge and hoses.
3. Wear safety glasses and gloves to avoid gas or liquid contact with eyes and skin.

Warning
This product operates under high pressure. Follow all safety guidelines regarding refrigerant handling including wearing Personal Protective Equipment such as safety glasses, and gloves.

Environmental Protection

1. Dispose of used batteries according to local recycling laws.
2. Avoid the release of refrigerant in open air.

Product Performance

Application

1. This gauge has been designed to maintain and repair HVAC systems. The product is intended to be used by trained technicians.
2. It is an integration of traditional manifold gauges with electronics to digitally display the system pressure and temperature.
3. Suitable for use of non-corrosive refrigerants, water, and alcohols.
4. Not suitable for ammonia as a refrigerant.
5. Not suitable for applications with anti-explosion requirements.

Specifications

Description

Basic function

1. Folding hook, easy to hang and transport.

2. LCD display.
   Battery capacity:

3. Control Keys

4. Five 1/4″ connectors, 2 on the left and right sides are 1/4″ joint hangers. 3 are on the bottom, among them, a 2-way connector in the middle of the bottom, one way is a dead 1/4″ connector, and one way for a 1/4″ connector, the 1/4″ connector to be connected to a refrigerant container or recovery equipment.

5. Two control valves are on the front of the gauge.

6. The battery box is on the back of the gauge.

7. Sight glass allows you to observe the flow of refrigerant.

Initial Setup

1. Place the battery into the battery compartment (two 9V LR dry batteries) Attention:
   Remove the battery if you do not intend to use the device for a long time.

2. Starting

   • Press for about 2 seconds, the gauge will power on and goes into operation.
   • Press to turn the backlight on or off. The backlight will automatically turn off after 3 minutes of no action.
   • Press to turn it on.
   • Press for 4 seconds to shut down.

3. Menu

4. Press to start the setting process by choosing the type of refrigerant, pressure unit, and temperature unit. It’s a rotation switch, Press to select the refrigerant type, press again, goes to select the pressure unit, and press the third time, to select the temperature unit.

5. Setting process

  * When entering into the setting mode, the selected type (i.e. Refrigerant Type, Pressure Unit, or Temperature Unit) will flash. Select the desired type by pressing or button. Press to confirm.
  * The setting mode will be automatically canceled if no action for 20 seconds.  

Note:
There is only one measuring unit for the vacuum level display, which is in Hg. Once the system is under vacuum, the gauge will automatically detect it and the display will show “inHg” as the measurement unit.

4. Control valve operation:
   • The control valve of the digital gauge is the same as the traditional mechanical gauge. Once connected to the HVAC system with the refrigerant hoses, open the control valve, the refrigerant will get through the valve and the gauge will measure the refrigerant pressure.
   • Open the control valve: turn the knob 90 degrees anticlockwise, accordingly to label on the gauge.
   • Close the control valve: turn the knob 90 degrees clockwise.

Operation Instruction

Preparation

Starting the gauge

Press for about 2 seconds.
With the control valves closed, connect the refrigerant hoses.

1. Connect the lower left connector to Blue hose, and lower right connector to Red hose.
2. Connect Yellow hose to the middle connector.
3. The other side of the hoses should be connected to corresponding equipment.

Warning:
The refrigerant hoses could be damaged if the gauge are dropped or impacted by external collision. Please inspect the gauge and hoses for visible or concealed damages.

Refrigerant Setting

Press
The setting menu is activated, press until the refrigerant setting flashes.

Refrigerant setting:

For example, setting R-32 refrigerant:

1. Press or button until R-32 shows up.
2. Press to confirm the setting.

Attention:
Refrigerant R-1234yf will be shown as R-922B in menus, due to limited digits in the LCD Display.

Preparation for pressure measuring

Warning:

1. High or low temp and high-pressure refrigerants may cause injury to humans.
2. Wear safety glasses and gloves for protection.
3. Make sure the gauge is properly secured before use.
4. The hoses should be in good condition and connected correctly before use. It is not recommended to tighten the hoses by tools to avoid damage to the treads of the hoses.
5. Pay extra attention to avoid risks when measuring the pressure of refrigerants.

Pressure Measuring

1. Take the steps mentioned above.
2. Open the valves.
3. Read the display on the screen.

Attention:
The reading will be flashing and show OL when the pressure exceeds the maximum 50 bar.

Zeroing operation

Warning:
Due to temperature and pressure changes, the digital gauge could require zeroing before operation.

1. Press and choose the mode of operation as described above.
2. Open all input ports to ensure that the air pressure outside and inside the gauge is the same.
3. Press and at the same time.Display should show0.0.

Maintenance

1. Gauge Cleaning
   Use a wet cloth to clean the surface of the gauge if necessary.
   Attention:
   You can use a mild detergent to clean the surface but do not use strong alkaline or acid detergents.

2. Copper Connections Cleaning
   A wet cloth can be used to clean the connections.

3. Hose Condition
   Check the hose condition every time before use and change it if necessary.

4. Valve Cleaning
   Open the valves and blow out dirt and impurities with compressed air.

5. Battery Replacement

6. Power off the gauge.

7. Open the battery box cover.

8. Remove the old battery and replace it with a new battery (pay attention to the battery polarity!).

9. Power on the gauge to check if the new battery works well.

10. Close the battery box.

Troubleshooting

Warranty

1. The warranty period is 1 year from the date of sale.
2. Consumables such as refrigerant hoses are not covered by this warranty.
3. Damages caused by human factors are not covered by warranty.
4. Defective products during the warranty period will be repaired or replaced for free.

NAVAC Inc.

• www.NavacGlobal.com
• Tel/Fax:
  • +1 877 MY-NAVAC
  • 877 696 2822

MADE IN PRC.

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