NAVAC NRP8Di User manual

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NRP6D NRP8Di i
User Manual
Smart Vacuum Pump

NRP6Di and NRP8Di, the HVACR industry’s first smart vacuum pumps, use inverter drive, vacuum
measurement, and smart control technologies to begin the era of smart pumps.
NRP6DV and NRP8DV also use DC inverter drive motors, but use a mechanical vacuum gauge to
insure the proper vacuum has been achieved.
The inverter-driven twin-cylinder vacuum pump is powerful, weighs up to 16 lbs less than a conventional
pump and provides deep evacuation, insuring that all non-condensables and moisture have been
removed from the sealed system prior to charging with refrigerant.
Vacuum measurement technology precisely measures the system evacuation during the entire
process and provides real time vacuum level display, so you have a comprehensive view of the
systems internal evacuation condition.
The pre-programmed computer chip, smart control technology, and the standard solenoid valve
ensure the system’s moisture removal by automatically extending the evacuation time to achieve the
set vacuum.
Upon reaching the set evacuation level, the NRP6Di and NRP8Di models will beep to announce the
evacuation is completed and the technician can move on to charging the system.
In order to make it easier to understand the components of the vacuum pump, please see the
picture below.
DC INVERTER DRIVE VACUUM PUMPS
Model
Power Supply
Flow Rate ( CFM )
Ultimate Vacuum
Motor Power ( HP )
Oil Capacity ( oz )
Dimensions ( in )
Weight ( lbs )
Inlet Port
NRP6Di
110V / 60Hz
6 CFM
15 micron
3/4
17.6
25.35
1/4", 3/8", 1/2" Flare
NRP8Di
110V / 60Hz
8 CFM
15 micron
3/4
17.6
25.35
1/4", 3/8", 1/2" Flare
14×5.3×11.9 14×5.3×11.9
APPLICATION
NAVAC inverter drive dual-stage rotary vane vacuum pumps are used to remove air, moisture, and
other non-condensables from sealed HVACR systems. The products can be used for evacuation of
HVACR repair and new installations, with refrigerants including CFC, HFC, HCFC, and HCEF, such as
R-12, R-22, R-410A, R-404A, R-32, R-134A, 1234yf, etc.
SPECIAL FEATURES
- Lighter and smaller, and premium quality vacuum pump, weighing under 26 lbs.
- Built-in solenoid isolation valve which closes automatically on shutdown or loss of power.
- Integrated vacuum gauge/pump structure, high precision, for deep ultimate vacuum level.
- Forced oil lubrication ensures vane sealing, cooling and high reliability.
- Large and easy to see oil-level window design help prevent oil supply shortage.
- Non-sparking design, suitable for R-32, 1234yf refrigerants.
01
INTRODUCTION AND TECHNICAL INFORMATION
TABLE OF CONTENTS
The Industry’s First Smart Vacuum Pump
INTRODUCTION AND TECHNICAL INFORMATION
DC INVERTER DRIVE VACUUM PUMPS
APPLICATION
SPECIAL FEATURES
PREPARATION PRIOR TO USING VACUUM PUMP
SAFETY WARNINGS
USE GUIDE
MAINTENANCE
REQUIREMENT FOR WARRANTY COVERAGE
TROUBLESHOOTING
EXPLODED VIEW
REPAIR PARTS LIST
DIMENSION
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01
01
01
01
02
03
04
05
05
06
07
..............................................................................
08
.........................................................................
09
Handle
Inlet
Power switch
Digital display
Rear cover
Motor
Base
Gas ballast valve
Oil mist filter
Oil drain plug
Oil tank
Oil lens
Hook

PREPARATION PRIOR TO USING VACUUM PUMP
1. Verify the power supply being used, to match the voltage on the nameplate.
2. Ensure that the pump is switched off prior to connecting to the power source.
3. Check for proper oil level, or change if needed.
4. Remove the oil fill cap, filling oil to the level in between the two oil sight glass lines, as shown in the
drawing below. For specific pump oil volume, please see the technical specification table.
Switch on the power and the pump will begin to operate. After running for approximately one minute,
check the oil level. If the oil level is too low, switch off the machine and add the required extra oil.
Reinstall the oil fill cap.
Note: While the pump is operating, the oil level should be in between the two oil position lines. If the
oil level is too low, it will reduce the performance and could damage the pump vanes. If the oil
level is too high, it could cause oil to discharge through the pump exhaust.
SAFETY WARNINGS
Note: In order to avoid personal injury, please carefully read and follow the instructions in this user
manual and the user guide of the pump.
NAVAC VACUUM PUMPS ARE NOT ALLOWED TO BE USED FOR A3 OR FLAMMABLE
REFRIGERANTS.
1. NEVER CONNECT A VACUUM PUMP TO A PRESSURIZED SYSTEM. Always check to make
sure that system and piping pressure is NOT ABOVE ATMOSPHERIC PRESSURE.
2. When handling refrigerants, please wear an eye-protection such as safety glasses or goggles.
3. Avoid direct physical contact with refrigerants, you will get burned.
4. When connecting the power source, all equipments must be grounded in order to prevent
electrical hazards.
5. When the pump is in operation, the enclosure surfaces will be hot. Do not touch the oil box or the
motor case. Allow adequate ventilation space for heat dissipation.
6. When using R-32, 1234yf or other flammable refrigerants, use an explosion proof electrical outlet.
7. Keep pump dry and away from water, mud, and dirt at all times.
8. Operating pump with intake fittings open to the atmosphere must not exceed 3 minutes.
9. Ambient temperature range for pump use is 30°F to 104°F (-1°C~40°C). The pump can be used in
lower ambient conditions, if warmed up inside first and run for no more than 1 minute to warm the
oil prior to system evacuation.
10. The pump requires 110V±10% power, and the power outlet must be grounded.
11. Prior to connecting the vacuum pump to an A/C-R system, please use proper methods to
remove refrigerant from a pressurized system. Note that pumping refrigerants under
high-pressure conditions will damage the pump, and refrigerant must be removed using a
recovery machine designed for that purpose.
03
02
Note: In order to prevent pump oil from spilling out, please add oil slowly.
GROUNDING INSTRUCTIONS
This product must be grounded. In the event of an electrical short circuit, grounding reduces the risk of
electric shock by providing an escape wire for the electric current. This product is equipped with a cord
having a grounding wire with an appropriate grounding plug. The plug must be plugged into an outlet
that is properly installed and grounded in accordance with all local codes and ordinances.
WARNING:
Improper installation of the grounding plug is able to result in a risk of electric shock. When repair or
replacement of the cord or plug is required, do not connect the grounding wire to either flat blade
terminal. The wire with insulation having an outer surface that is green with or without yellow stripes is
the grounding wire.
Check with a qualified electrician or serviceman when the grounding instructions are not completely
understood, or when in doubt as to whether the product is properly grounded. Do not modify the plug
provided; if it does not fit the outlet, have the proper outlet installed by a qualified electrician.
WARNING:
This machine should only be used for evacuation of refrigerant systems after refrigerant has been
removed from the system and the system has been opened to atmosphere. This machine is not to be
used as a transfer pump for liquids or any other media; doing so can damage the product.
GROUNDED
OUTLET
GROUNDING
PIN

USE GUIDE
1. When using the vacuum pump, remove the inlet
protection cap from the desired (1/4”, 3/8”, or
1/2”) connecting port, as shown in the diagram
above, and connect the pump to the system or piping
to be evacuated.
Use shortest hoses possible for faster and more
thorough evacuation.
2. Inspect the hose inlet connection, as well as all connecting hoses for proper seal. There must be
no leakage or it will be impossible to draw the required deep vacuum level.
3. At the beginning of the evacuation process, open the GAS BALLAST screw one full turn
counter-clockwise, and once the vacuum gauge reaches 2000 microns, retighten to achieve
desired vacuum level.
4. After evacuation is completed, the smart vacuum pump will beep to indicate the vacuum is
complete. If a DV-series pump is being used, shut down the pump and close the system access
valve(s).
5. Turn off the power switch on the pump and disconnect power.
6. Remove the evacuation hoses.
7. Close the air entry cap and the air exhaust cap tightly (with the exception of models without air
exhaust cap), to prevent dirt or particulates from entering the pump.
Note:
1. For the Di-series pumps equipped with a digital vacuum gauge, after turning on the power, press
the start button on the display panel to start the pump. When the vacuum reaches 500 microns,
the pump will continue running at a reduced speed. Then 30 minutes after this, buzz alarm
indicates the evacuation is complete.
2. Always evacuate systems in conjunction with a micron vacuum gauge, such as the NAVAC
NMV1, if using the standard inverter drive pump. Micron vacuum gauges precisely measure and
display system evacuation during the entire process, giving you a comprehensive view of the
sealed system internal evacuation condition.
3. Please pay attention to any changes in the oil level during pump operation. If the oil level falls
below the center line, immediately add more vacuum pump oil to avoid damage to the pump.
4. If any residual refrigerant comes in contact with the vacuum gauge sensor, the digital display may
go wrong.Once the refrigerant has been evacuated, the sensor and display will automatically
start working again.
5. Vacuum pump and oil must be above 30℉.
1/4” 1/2”
3/8”
CAUTION-To reduce the risk of electric shock, do not expose to rain. Store indoors.
The product should be placed steadily without any incline when it is working. If it has finished its job ,
please get the plug off and keep the pump housing dustproof by covering a clean film plastic bag on it.
EXTENSION CORDS
If an extension cord must be used, be sure it is:
1. A 3-wire extension cord that has a 3-blade grounding plug, and a 3-slot receptacle that will accept
the plug on the product
2. In good condition
3. No longer than 50' (15.2m)
4. 16 gauge (AWG) or larger. (Wire size increases as gauge number decreases. 14 AWG and
12AWG may also be used. DO NOT USE 18 AWG )
NOTICE: Risk of Property Damage. The use of an undersized extension cord will cause voltage to
drop resulting in power loss to the motor and overheating.
0504
MAINTENANCE
1. Vacuum pump oil has three major functions: pump lubricant, pump cooling, and pump sealant.
During the evacuation process, the pump oil will absorb moisture being pulled from the system,
causing it to be less effective as a lubricant and pump vane seal, extending evacuation time and
possibly allowing the pump to overheat. We recommend that the oil be changed just before
evacuating each A/C-R system to insure the pump oil is in a clean condition as this is the key factor
in determining if the pump can achieve the required vacuum levels. In order to maintain the
optimum operation of the pump, we recommend that you use NAVAC vacuum pump oil. This oil is
made using a unique process and can maintain proper viscosity during normal operation and
temperatures, and it’s also helpful for cold starts. Should the NAVAC oil not be available, reputable
brands of special-purpose vacuum pump oil may be used.
Note: Should the pump oil become opaque, dirty, or full of moisture, promptly change oil. This will
greatly speed up evacuation, especially when there is a lot of moisture in system piping from
having been left open to the atmosphere for an extended period of time.
Oil change procedure:
1. To ensure that the pump and oil are warm, run pump for approximately one minute prior to
changing oil. Do not run longer than this, as it may be possible to damage the pump.
2. While the pump is running, open one inlet port and allow oil to drain out of the pump. After turning
off pump, open the oil drain plug, and drain used oil into an appropriate vessel and dispose of
properly.
3. As oil stops draining, tip the pump to drain any remaining oil in the bottom of the pump.
4. Replace and tighten oil drain plug.
5. Remove oil fill cap, pour in new oil until the oil is at the proper level in the sight glass (the same
procedure prior to using the pump above).
REQUIREMENTS FOR WARRANTY COVERAGE
Product warranty is provided for product quality problems for two years from date of sale. For
warranty to be valid, the following conditions must be met:
1. Products issues due to manufacturing defects confirmed by qualified agents.
2. Products which have not been maintained or dismantled by unauthorized parties.
3. Products that have been used in accordance with the User Manual. All maintenance services shall
be performed during the warranty period.
Statement: Other than repairing the product defective, the manufacturer of this product will not be
liable for any other costs, such as time spent in fixing the issue, refrigerant consumption,
refrigerant disposal costs, as well as unauthorized transportation and labor costs.

TROUBLESHOOTING
Malfunction
Low
Vacuum
Oil leak
Start-up
problems
Oil spray
Possible Cause
1. Secondary air inlet connection cap loose on the
air inlet port.
2. Damaged rubber ring inside the secondary air
inlet connection cap.
3. The volume of oil is insufficient.
4. Pump oil becomes opaque or absorbed too
many impurities.
5. The pump’s oil entry hole is clogged or the oil
supply is insufficient.
6. The pump connecting hoses, manifold or
system has a leak.
7. The pump selection is wrong.
8. The pump has been used for too long, damage
and wear to components caused increased
gaps between parts.
1. Damaged oil seal.
1. Oil temperature is too low.
2. Motor, power source or circuit board
malfunctions.
3. Foreign objects entered the pump.
4. Voltage supply is excessively low or high.
5. Overload trips.
1. Excessive oil volume.
2. Inlet port pressure is excessively high for a long
period.
2. Loose or damaged oil box connections.
Remedy
Tighten the cap.
Replace the rubber ring.
Add oil to the center line of the oil display.
Replace with new oil.
Clean the oil entry hole, clean the oil filter.
Inspect the connecting hose gaskets and
system, repair leaks.
Check the size of the container to be evacuated,
recalculate and select an appropriate pump
model.
Inspect and repair, or replace the pump.
Inspect and repair.
Inspect and remove.
Inspect the power source voltage.
After overload trip occurs, switch kept On.
Remove the power plug, wait for approximately
30 seconds before inspecting and reparing.
Replace the oil seal.
Tighten the connecting screws, replace O-rings.
Remove oil until the oil position line is reached.
Select an appropriate pump, increase the
pumping speed.
Exposed the air entry hole to the external
atmosphere, and remove the oil fume filtration
device. Use a screwdriver to turn the engine
axle in an anti-clockwise direction.
Notes:
1. The pump is inverter driven and the motor has over-current / overload protection, please troubleshoot after
overload resets.
2. If the above methods cannot resolve your problems, please contact your nearest distributor or take the pump to a
repair center. We will do our best to provide you with a quick turnaround to keep you working.
0706
EXPLODED VIEW

REPAIR PARTS LIST
Ref No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
PART No.
RP18001
RP18002
RP18003
RP18004
RP18005
RP18006
RP18007
RP18008
RP18009
RP18010
RP18011
RP18012
RP18013
RP18014
RP18015
RP18016
RP18017
RP18018
RP18019
RP18020
RP18021
RP16021
RP18022
RP18023
RP18024
RP18025
RP18026
RP18027
RP18028
Oil Housing Assy
Exhaust Filter and Noise Reducer
O-ring
Pump Body
Gas Ballast Assy
O-ring
O-ring
Motor Assy
Gas Ballast Knob
Handle
1/4" Inlet Cap
Four-Way Connection
3/8" Inlet Cap
1/2" Inlet Cap
Solenoid Valve Winding
Iron Core Assy
Solenoid Valve Body
Fan
Elastic Collar
O-ring
Digital Display Controller Assy
Capacitor
Back Cover Assy
Guard Board I
Guard Board II
Sheath
Base Plate
Controller Assy
Description
0908
DIMENSION
Model
NRP6Di
NRP8Di
A
14
14
A1
9.2
9.2
A2
2.9
2.9
B
5.3
5.3
B1
4
4
H1
8
8
H
11.9
11.9
Unit: inch
A
A1
A2
H2
B1
B
H
H1

Manuel d'utilisation
Pompe à vide intelligente
NRP6D NRP8Di i
CONSERVEZ CE MANUEL
POUR RÉFÉRENCE ULTÉRIEURE
Ne pas suivre ces mises en garde
peut entraîner la mort ou de graves blessures.

°C °C
°F°F

℉

VUE ÉCLATÉE

N° DE RÉF.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
N° DE PIÈCE.
RP18001
RP18002
RP18003
RP18004
RP18005
RP18006
RP18007
RP18008
RP18009
RP18010
RP18011
RP18012
RP18013
RP18014
RP18015
RP18016
RP18017
RP18018
RP18019
RP18020
RP18021
RP16021
RP18022
RP18023
RP18024
RP18025
RP18026
RP18027
RP18028
Assemblage du boîtier d'huile
Filtre d'échappement et réducteur de bruit
Joint torique
Corps de pompe
Assemblage du ballast à gaz
Joint torique
Joint torique
Assemblage du moteur
Bouton de lestage du gaz
Poignée
Capuchon d'entrée 1/4 po
Connexion à quatre voies
Capuchon d'entrée 3/8 po
Capuchon d'entrée 1/2 po
Bobinage de l'électrovanne
Assemblage du noyau de fer
Corps de l'électrovanne
Ventilateur
Col élastique
Joint torique
Assemblage de contrôleur d'affichage numérique
Condensateur
Assemblage du couvercle arrière
Panneau de protection I
Panneau de protection II
Gaine
Plaque de base
Assemblage de contrôleur
0908
LISTE DES PIÈCES DE RECHANGE
NOM DE LA PIÈCE