NAVAC NR7 Recovery Unit User Manual

NAVAC NR7 Recovery Unit

GENERAL SAFETY

Use information

• To prolong the life cycle of the recovery unit, please read the manual carefully before using it to fully understand the safety, specification as well as operating procedure of the recovery unit.
• Please check the product received is the same as you ordered.
  • Please check the product if there is any damage during transportation.
  • Contact with local distributor if the above problem is found.
• Please read the manual carefully and use the unit according to the product operating procedures.

Safety indication

Warning
This mark indicates procedures that must be strictly observed to prevent hazards to people.

Notice
This mark indicates procedures must be strictly observed to prevent damage or destruction of the unit.

Matters needing attention

Warning

• Only a qualified technician should operate this recovery unit.
• Before starting the equipment, make sure that it is well grounded.
• If using an electrical extension cord, the cord must be in good condition and properly connected and grounded.
• Only a qualified electrician can do the wire connection according to the technical standard and circuit diagram.
• The power must be cut off and no display in the LCD before inspecting or repairing.
• If the original power supply cord is damaged, an OEM replacement may be ordered through your NAVAC distributor.
• Please take the power supply and the capacity of your ammeter and electrical wire.
• Only authorized refillable refrigerant tanks can be used. The setting of the pressure limiting device shall not be lower than 45 bar(653psi). Do not overfill the recovery tank, maximum at 80% capacity to make sure that there is enough space for liquid expansion. Overfilling of the tank may cause an explosion.
• Always wear safety goggles and protective gloves while working with refrigerants to protect your skin and eye from hurting by refrigerant gases or liquid.
• Do not use this equipment near flammable liquid or gasoline.
• A digital scale is needed to prevent overfilling.
• Be sure that the place where you are working is thoroughly ventilated.

Notice

• Be sure the unit is working under the right power supply.
• When using an extension cord it should be a minimum of 14 AWG and no longer than 25 feet, otherwise it may cause the voltage drop and damage the compressor.
• The input pressure of the unit should not exceed 26 bar (377.0 psi).
• The unit needs to be laid horizontally, otherwise it will lead to unexpected vibration, noise or even abrasion.
• Do not expose the equipment to sun or rain.
• The ventilation opening of the unit must not be blocked.
• If the overload protector pops, reposition it after 5 minutes.
• When doing the self-purging operation, the knob must be turned slowly to “PURGE” to ensure the inlet pressure is less than 5 bar(72.5 psi).
• If a fluid hammer happens in the recovery, please turn the knob slowly to the “SLOW” position and do not let the reading pressure drop to zero.
• When you select a fast model to start work. please monitor output pressure, if the output pressure increases fast to 27 bar (391.6 psi), please turn to slow mode slowly and monitor the outlet pressure not exceeding 35 bar (507.6 psi).
• The equipment is intended for serving air-conditioning and refrigeration systems containing less than 200 lbs of high-pressure refrigerant.
• The tank and hose used must comply with the local regulations.

OPERATION MANUAL

1. Connect the power supply, the indicator light is on for 2 seconds and then off, press the button “ ” to keep it for more than 0.2 seconds and then release it to start the device; after an interval of more than 0.5s, press the button “ ” to keep it for more than 0.2 seconds and then release it to tum off the device, after more than 2 seconds, press the button “ ” to start the device.
2. Do not mix different refrigerants in one tank, otherwise, they cannot be separated or used.
3. Before recovering the refrigerant, the tank should achieve the vacuum level: of -29.6inHg, for purge non­condensable gases. Each tank was full of nitrogen when it was manufactured in the factory, thus the nitrogen should be evacuated before first use.
4. The knob should be in the “Close” Position before operation. All the valves must be closed, the input and output fittings should be covered with protective caps when the unit is not in operation. The air/ moisture is harmful to the recovery result and will shorten the life span of the unit.
5. A filter drier should always be used and should be replaced regularly. Each type of refrigerant must have its filter. For the sake of ensuring the normal operation of the unit, please use the high-quality filter drier specified. A high-quality filter drier will help protect the machine.
6. Special caution is needed when recovering from the system, and two dry filters are needed.
7. The unit has an Internal High-Pressure protector. If the pressure inside the system is above-rated shut-off pressure (see specification), the compressor will automatically shut off and the HP cutoff shows: To restart the compressor, please lower the internal pressure (Output gauge indicates lower than35 bar/507.6 PSI) after the HP cutoff blinks, then Press the “START” button to restart the compressor. When high-pressure protection initiates, please determine the cause and deal with it before restarting the unit.
8. The input valve of the refrigerant tank is closed–Opening the valve will help solve the problem.
9. The connecting hose between the recovery unit and refrigerant tank is plugged close all the valves and replace the connecting hose.
10. The temperature of the refrigerant tank is too high, causing high pressure- cool the tank down.
11. The unit is equipped with an O.F.P. socket and can be connected to a cylinder with a full liquid protection output using the O.F.P. connection cable. When the O.F.P. cable is not plugged in, the unit automatically blocks the O.F.P. function.
12. When recovering a large amount of liquid refrigerant, it is recommended to use the “push-pull mode”.
13. To ensure that there is no refrigerant in the equipment after recovery, please read the “self-cleaning” operation procedure in this instruction manual carefully. The residual liquid refrigerant in the condenser may expand and cause damage to the components.
14. The low-pressure gauge of this equipment indicates the pressure of the compressor inlet in the recovery machine; the high-pressure gauge indicates the pressure of the outlet.
15. After using the equipment, please turn the knob back to the “CLOSE” position.

SPECIFICATION

Flow Rate

CONTROL PANEL INTRODUCTION

Start switch:
Starts and stops the unit; press and hold for 0.3 seconds then release to start the unit, and press again after 2 seconds to stop the unit.

• Overload: Overload warning.
• O.F.P Cutoff: Will Light up when the recovery cylinder is 80% filled, or if the O.F.P cable is shorted. The machine will stop running.
• HP Cutoff: Will Light up when the high-pressure switch is activated above 560 Psi.
• Close: Intake valve closed
• Recover: Intake valve partially open
• FAST: Inlet valve fully open
• Purge: The input valve is closed and the output valve is open so that the refrigerant in the equipment can be recovered.

PARTS DIAGRAM

WIRING DIAGRAM

OPERATING INSTRUCTION

1. Refrigerant hoses exhaust
   Ready for operation
   Connect the hoses correctly and firmly. (Please refer to the connection diagram)

2. Confirm the vapour valve and liquid valve of the AC system are in close position.

3. Confirm the vapour valve and liquid valve of the recovery tank are in close position.

4. Open the vapour and liquid valves of the manifold gauge.

5. Loosen the connecting hoses of the refrigerant tank.

6. Open the check valve of the hoses.
   Start operation

7. Plug in the machine, and turn on the power.

8. Turn the knob to “Fast”.

9. Press the” ” switch to start the machine, and start pumping air inside the hose.

10. Observe the low-pressure gauge, the pointer is in the range of “-76cmHg-0” for 30 seconds.

11. Turn the knob to the “CLOSE” position, then slowly tum to the “PURGE” position to start purging.

12. Observe the low-pressure gauge, the pointer is in the range of “-76cmHg-0” for 30 seconds.
    Finish operation

13. Turn the knob to “CLOSE” and stop self-purging.

14. Disconnect the refrigerant hose to the tank.

15. Recovery mode Ready for operation
    Connect the hoses correctly and firmly. (Please refer to the connection diagram) Make sure all valves are closed.

16. Open the vapour and liquid valves of refrigerant equipment.

17. Open the vapour valve of the refrigerant tank.

18. Turn the knob to “FAST”

19. Slightly loosen the hose connector connected to the tank to remove the air inside, and then immediately tighten the connector.

20. Open the connection of the corresponding tank (vapour recovery to the liquid port, liquid recovery to the vapour port )

21. Press the” ” switch to start the machine.

22. a. If recover liquid refrigerant, please open the liquid valve of the manifold gauge.
    b. If recovered vapour refrigerant, please open the vapour valve of the manifold gauge.

23. Run to the desired vacuum level to finish recovery. Once reached, please tum knob to purge to start the purging process.
    Notice

24. If a fluid hammer happens in the recovery, please tug the knob to the “Slow” position slowly, then the reading of the low-pressure gauge drops until the fluid hammer stops; but do not let the reading pressure drop to zero, otherwise inlet port is not pumping once at zero pressure.

25. If tt is difficult to start, turn to “CLOSE” when liquid, turn to “PURGE” when vapour, then press “ ” to restart the machine, and turn to the required position.

26. Purge mode
    Notice
    The unit must be purged after each use;
    Liquid refrigerant may expand and damage the components and pollute the environment.
    Start operation

27. Run to the desired vacuum level to finish recovery.

28. Tum the knob to “Purge” and start purging.

29. The self-purging mode will be finished when the machine runs to a certain vacuum level.
    Finish operation

30. Tum the knob to “Close”.

31. Tum off the power switch. Disconnect the power cord.

32. Close the check valve which is connected to the exhaust.

33. Close the vapour valve of the tank.

34. Disconnect all hoses.

35. Liquid push/pull mode
    Notice
    An electric scale is needed to monitor the recovery process to prevent overfilling.

Ready for operation
Connect the hoses correctly and firmly. (Please refer to the connection diagram) Make sure all valves are closed. Exhaust the air in the recovery first: open the recovery machine and loosen the exhaust port , turn the knob to the “FAST”first, and then to the “PURGE” to finish, then tum off the machine.

Start operation

1. Open the vapour valve and liquid valve of the HVAC system.
2. Slightly loosen the liquid hose connector at the tank and tighten the connector quickly after releasing the refrigerant.
3. Slightly loosen the connector of the exhaust pipe at the recovery machine and lighten the connector quickly after releasing the refrigerant.
4. Open the vapour valve and liquid valve of the tank.
5. Turn the knob to “FAST’
6. Press the” ” button to start the machine, and then it starts liquid push/pull mode.
7. Turn the knob slowly to “Purge” and start self-purging mode for the liquid.
8. Turn the knob to “Close”.
9. Close the vapour valve and liquid valve of the HVAC system.
10. Close the vapour valve and liquid valve of the tank.
11. Reconnect the hoses and start recovery mode for the vapour.

TROUBLESHOOTING

Correct Disposal of this product:
This marking indicates that this product should not be disposed of with other household wastes. To prevent possible harm to the environment or human health from uncontrolled waste disposal, please use the return and collection systems or contact the retailer where the product was purchased. They can take this product for environmentally safe recycling.

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