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NAVAC Inc.
www.Na vac Glo bal .com
Digital Manifold Gauge
N2D4H
User Manual
Failure to follow warnings could
result in death or serious injury.
SAVE THIS MANUAL
FOR FUTURE REFERENCE
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Safety Instruction
Product Performance
Description
Initial Setup
Operation Instruction
Maintenance
Service
CONTENT
01
01
03
04
06
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Safety Instruction
1. Safety Guide
Do not use the product in dangerous places or on a moving object.
1.1
Only qualified service personnel should maintain and repair this product.
1.2
If the product gets external collision or falls to the ground, it may be damaged
1.3
or cause damage of refrigerant hoses. It is recommended to check up the
manifold gauge and hoses.
1.4
Wear safety glasses and gloves to avoid gas or liquid contact with eyes and
skin.
2. Environmental Protection
Dispose used batteries according to local recycling laws.
2.1
Avoid release of refrigerant in open air.
2.2
Product Performance
1. Application
This gauge has been designed to maintain and repair HVAC systems. The
1.1
product is intended to be used by trained technicians.
It is an integration of traditional manifold gauge with electronics to digitally
1.2
display the system pressure and temperature.
Suitable for use of non-corrosive refrigerants, water, alcohols.
1.3
1.4
Not suitable for ammonia as a refrigerant.
1.5
Not suitable for applications with anti-explosion requirements.
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2. Specifications
Supportive Unit
Sensor
Refresh rate
Testing medium
Connection
Pressure scale
Environment
humidity
Maximum overload
pressure
Pressure display: bar, psi, Kpa, Mpa, kgf/cm²
Temperature display: ℃, ℉
Vacuum display: inHg
Pressure sensor×2(Built in )
1s
R22, R32, R134A, R290, R404A, R407A, R407C,
R410A, R426A, R427A, R434A, R442A, R448A,
R449A, R450A, R452A, R453A, R507A, R513A,
R600A, R744, R1234YF
3×1/4" SAE
0~50 bar, 0~720 psi, 0~5000 KPa, 0~5 Mpa,
0~51 kgf/cm²
Vacuum scale: -29.9~0 inHg
10~90% RH
75 bar, 7500 Kpa, 7.5 Mpa, 1087 psi, 76.5 kgf/cm²
Unsuitable
medium
Environment
requirement
Shell
Power
Display
Description
1. Basic function
1
2
3
Ammonia(R-717)and ammoniac refrigerant.
Operation temperature: -14~122℉
Storage temperature: -4~140℉
Material: ABS /PC/ TPE
Size: 6.2×6.5×2.5 in
Weight: 31.5 oz
2×9V LR dry battery
LCD display with backlight
6
Resolution
Measure precision
(At 22℃ / 72℉)
02
0.1 psi, 0.1 bar, 1 Kpa, 0.001 Mpa, 0.1 kgf/cm²
Vacuum resolution: 0.1 inHg
Pressure: ±2 psi, ±0.2 bar, ±20 Kpa,
±0.02 Mpa, ±0.2 kgf/cm²
Vacuum: ±1 inHg
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1. Folding hook, easy to hang and transport.
2. LCD display.
3.2. Setting process
Symbol
or
Function
Changing options
Confirm the current selection
3. Control Keys
Button Function ButtonFunction
Power
Incr eas e but ton
Menu Decr eas e but ton
4. Five 1/4" connectors (1 on the left side and 3 on the bottom, on the right side is a
dead 1/4" parking port). The central connector on the bottom is a 2-way
connector with 1/4" and 1/4" connector sizes, to be connected to a refrigerant
container or recovery equipment.
5. Two control valves are on the front of the gauge.
6. 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 battery)
Attention:
Remove the battery if you do not intend to use the device for a long time.
Starting
2.
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
3.1. Press to start 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, press
the third time, to select the temperature unit.
When enter into the setting mode, the selected type (i.e. Refrigerant Type, or
Pressure Unit, or Temperature Unit) will flash. Select the desired type by pressing
or button. Press to confirm.
Setting mode will be automatically cancelled if no action for 20 seconds.
Adjustable specification
Selection Types
Note
R22, R32, R134A, R290, R404A, R407A,
R407C, R410A, R426A, R427A, R434A,
R442A, R448A, R449A, R450A, R452A,
12 optional refrigerants
R453A, R507A, R513A, R600A, R744,
R1234YF
psi, bar, Kpa, Mpa, kgf/cm²
℃, ℉
Control valve operation:
4.
5 optional pressure units
2 optional temperature units
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.
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Operation Instruction
1. Preparation
1.1 Starting the gauge
Press for about 2 seconds.
With the control valves closed, connect the refrigerant hoses.
1.1.1 Connect the lower left connector to Blue hose, and lower right connector to
Red hose.
1.1.2 Connect Yellow hose to the middle connector.
1.1.3 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.
1.2 Refrigerant Setting
1.2.1 Press
The setting menu is activated, press until the refrigerant setting flashes.
1.2.2 Refrigerant setting:
Symbol
Function
or
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.
2. Preparation for pressure measuring
Warning:
2.1 High or low temp and high pressure refrigerants may cause injury to human.
2.2 Wear safety glasses and gloves for protection.
2.3 Make sure the gauge is properly secured before use.
2.4 The hoses should be in good condition and connected correctly before using. It is
not recommended to tighten the hoses by tools to avoid damage to the treads of
the hoses.
2.5 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 shows OL when the pressure exceeds maximum
50 bar.
3. Zeroing operation
Warning:
Due to temperature and pressure changes, the digital gauge could require zeroing
prior to 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 show 0.0.
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Maintenance
Service
1. Gauge Cleaning
Use a wet cloth to clean the surface of the gauge if necessary.
Attention:
You can use 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 hoses condition every time prior to use and change it if necessary.
4. Valve Cleaning
Open the valves and blow out dirt and impurities by compressed air.
5. Battery Replacement
1. Power off the gauge.
2. Open the battery box cover.
3. Remove the old battery and replace with a new battery (pay attention to the battery
polarity!).
4. Power on the gauge to check if the new battery works well.
5. Close the battery box.
1. Troubleshooting
Problems
blink
Digital gauge shut
off automatically
Displays OL
Displays ERP FAIL
Fail to find R-1234yf
Battery low and change it.
1. Low battery
2. No operation in 15 minutes
1. Exceeds maximum range
2. Damage of sensor
Memory error
Couldn’t display R-1234YF because of limits
of the LCD display,Choose R-922B
Possible reasons
2. Warranty
1. The warranty period is 1 year from the date of sales.
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 product during the warranty period will be repaired or replaced for free.
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