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NAVAC NR7 Recovery Unit
User Manual
Important Safety Information:
Failure to follow warnings may result in death or serious injury. Keep this manual for future reference.
General Safety Measures:
- Only use approved refillable refrigerant tanks.
- Do not overfill the recovery tank; fill to a maximum of 80% capacity to allow for liquid expansion. Overfilling can cause a violent explosion.
- Always wear safety glasses and protective gloves when working with refrigerants to protect skin and eyes from gas or liquid refrigerant injuries.
- Do not use this equipment near flammable liquids or gasoline.
- A digital scale is required to prevent overfilling.
- Ensure the work area is well-ventilated.
Notice:
- Ensure the unit is powered by an adequate electrical supply.
- If using an extension cord, it must be at least 14 AWG and no more than 25 feet long to prevent voltage drop and potential compressor damage.
- The unit's input pressure must not exceed 26 bar (377.0 psi).
- The unit must be placed horizontally; otherwise, it may cause unexpected vibrations, noise, or abrasion.
- Do not expose the equipment to prolonged sunlight or rain.
- The unit's ventilation opening must not be obstructed.
- If the overload protector trips, reset it after 5 minutes.
- When performing the self-purge operation, turn the knob slowly to "PURGE" to ensure the input pressure is below 5 bar (72.5 psi).
- If a surge occurs during recovery, turn the knob slowly to the "SLOW" position and do not let the gauge reading drop to zero.
- When selecting the fast mode for recovery, control the output pressure. If the output pressure rapidly increases to 27 bar (391.6 psi), slowly turn to the slow mode and ensure the output pressure does not exceed 35 bar (507.6 psi).
- This equipment is intended for servicing air conditioning and refrigeration systems containing less than 200 lbs of high-pressure refrigerant.
- The tank and hose used must comply with local regulations.
Instructions for Use:
- Connect the power supply. The rocker switch should be in the "-" position. The indicator light will illuminate for 2 seconds and then turn off. Press the "ON" button for more than 0.2s and release to start the device. After a pause of more than 0.5s, press the "OFF" button for more than 0.2s and release to turn off the device. After a pause of more than 2s, press the "ON" button to start the device.
- Do not mix different refrigerants in the same tank, as they cannot be separated or utilized.
- Before recovering refrigerant, the tank must reach a vacuum level of -29.6inHg to purge non-condensable gases. Each tank is filled with nitrogen at the factory; therefore, the nitrogen must be evacuated before first use.
- The knob must be in the "CLOSE" position before operation. All valves must be closed, and the inlet/outlet fittings must be covered with protective caps when the unit is not in use. Air or moisture is detrimental to recovery results and will shorten the unit's lifespan.
- Always use a filter drier and replace it regularly. Each type of refrigerant requires its own filter. Use the specified high-quality filter drier to ensure normal unit operation. A high-quality filter drier will help protect the machine.
- Special caution is needed when recovering from the system, requiring two filter driers.
- The unit has an internal high-pressure protector. If the system pressure exceeds the rated disconnection pressure (see specifications), the compressor will automatically shut off, and the HP CUT indicator will display. To restart the compressor, lower the internal pressure (so the outlet gauge reads less than 35 bar/507.6 PSI). After the HP CUT flashes, press the "START" button to restart the compressor. When high-pressure protection is activated, determine the cause and solution before restarting the unit.
- The refrigerant tank's liquid shut-off valve is closed: opening the valve will help resolve the issue.
- The connection hose between the recovery unit and the refrigerant tank is blocked: close all valves and replace the connection hose.
- The refrigerant tank temperature is too high, causing high pressure; cool the tank.
- The unit is equipped with an O.F.P. port and can be connected to a cylinder with liquid-filled output protection 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.
- When recovering a large amount of liquid refrigerant, it is recommended to use the "push/pull" mode.
- To ensure no refrigerant remains in the equipment after recovery, carefully read the "self-purge" operating procedure in this manual. Residual liquid refrigerant in the condenser can expand and damage components.
- The low-pressure gauge on this unit indicates the compressor inlet pressure, and the high-pressure gauge indicates the outlet pressure.
- After using the equipment, turn the knob back to the "CLOSE" position.
Specifications:
| NR7 | R22 | R134a | R410A | |
|---|---|---|---|---|
| Refrigerants | Category III: R-12, R-134a, R-1234YF, R-401C, R-406A, R-500 Category IV: R-22, R-401A, R-401B, R-402B, R-407C, R-407D, R-408A, R-409A, R-502, R-509 Category V: R-143A, R-32, R-402A, R-404A, R-407A, R-407B, R-410A, R-454B, R-507 |
0.58 lbs/min | 0.47 lbs/min | 0.54 lbs/min |
| Power | 115V, 60Hz | |||
| Motor | Brushless motor, 1 HP | |||
| Motor speed | 3000 RPM | |||
| Max current consumption | 12A | |||
| Compressor | Piston, oil-less, air-cooled | |||
| High-pressure protector | 38.5 bar | |||
| Operating temperature | 32~104°F | |||
| Dimensions | 12.2"x9.4"x9.6" | |||
| Net weight | 20.3 lbs | |||
| Flow rate | ||||
| Direct vapor | 9 lbs/min | 8 lbs/min | 12 lbs/min | 12 lbs/min |
| Direct liquid |
Flow Rate vs. Inlet Pressure:
Control Panel Introduction:
- Overload: Overload warning.
- O.F.P Cutoff: Illuminates when the recovery cylinder is 80% full, or if the O.F.P. cable is short-circuited. The machine will stop operating.
- HP Cutoff: Illuminates when the high-pressure switch activates above 560 Psi.
- CLOSE: Inlet valve closed.
- Recovery: Inlet valve partially open.
- FAST: Inlet valve fully open.
- PURGE: Inlet valve closed, outlet valve open, to recover refrigerant from the system.
Parts Diagram:
| NO. | Part Name | NO. | Part Name |
|---|---|---|---|
| 1 | Left side panel | 13 | Fan blade cover |
| 2 | Start switch | 14 | Fan blade |
| 3 | Rocker switch | 15 | Right side panel |
| 4 | O.F.P. port | 16 | Knob |
| 5 | Power supply | 17 | Duct |
| 6 | Condenser | 18 | Control assembly |
| 7 | Top panel | 19 | Motor control board |
| 8 | Rear panel | 20 | Base |
| 9 | Inlet duct | 21 | Inlet pressure gauge |
| 10 | Outlet duct | 22 | Outlet pressure gauge |
| 11 | Compressor | 23 | Indicator board |
| 12 | Motor | 24 | Front side panel |
Wiring Diagram:
| Graphic Code | Component |
|---|---|
| HS | High-pressure sensor |
| M | Motor |
| MCB | Motor control board |
| XS | Plug |
| DCB | Indicator board |
| LS | Low-pressure sensor |
| OFP | Overfill protector |
| TP | Temperature protector |
| HP | High-pressure switch |
| TS | Temperature sensor |
| PS | Start/stop switch |
| RS | Rocker switch |
| L1 | High-pressure alarm indicator |
| L2 | Liquid fill alarm indicator |
| L3 | Overload alarm indicator |
Operating Instructions:
Step A: Evacuation Hose
- Connect the hoses firmly as shown in the diagram.
- Confirm that the vapor and liquid valves of the air conditioning system are in the closed position.
- Confirm that the vapor and liquid valves of the recovery tank are in the closed position.
- Open the vapor and liquid valves of the manifold gauge.
- Loosen the refrigerant tank connection hoses.
- Open the check valve of the hoses.
- Plug in the machine and turn it on.
- Turn the knob to "FAST".
- Press the "ON" button to start the machine, beginning to pump air into the hose.
- Observe the low-pressure gauge; the needle should be in the range of "-76cmHg~0" for 30s.
- Turn the knob to "CLOSE", then slowly turn it to "PURGE" to start purging.
- Observe the low-pressure gauge; the needle should be in the range of "-76cmHg~0" for 30s.
- Connect the refrigerant hose to the tank.
- Turn the knob to "CLOSE".
- Press "ON" to stop the recovery machine.
Step B: Recovery Mode
Notice: An electric scale is needed to monitor the recovery process and prevent overfilling.
- Connect the hoses firmly as shown in the diagram.
- Ensure all valves are closed.
- Open the vapor and liquid valves of the refrigerant system.
- Open the vapor valve of the refrigerant tank.
- Turn the knob to "FAST".
- Slightly loosen the hose connector attached to the tank to extract air from the inside, then immediately tighten the connector.
- Close the vapor valve of the manifold gauge.
- Open the corresponding tank connection (vapor recovery to liquid port, liquid recovery to vapor port).
- Press the "ON" button to start the machine.
- If recovering liquid refrigerant, open the liquid valve of the manifold gauge.
- If recovering refrigerant vapor, open the vapor valve of the manifold gauge.
- Run until the desired vacuum level is reached to complete the recovery. Once reached, turn the knob to purge to initiate the purge process.
Notice: If a surge occurs during recovery, slowly turn the knob to the "SLOW" position, then the low-pressure gauge reading will decrease until the surge stops; however, do not let the pressure reading drop to zero, otherwise the inlet port will not pump once at zero pressure.
If it is difficult to start, turn to "CLOSE" when it is liquid, turn to "PURGE" when it is vapor, then press "ON" to restart the machine, and turn to the desired position.
Step C: Purge Mode
Notice: The unit must be purged after each use. Residual liquid refrigerant can expand, damage components, and contaminate the environment.
- Once the desired vacuum level is reached, turn the knob to "PURGE" and begin purging.
- Observe the low-pressure gauge and let it run until the desired vacuum level is reached.
- Press the "ON" button to stop the recovery machine.
- Close the tank's vapor valve.
- Disconnect the outlet hoses. (Note: residual refrigerant remains in the hose)
- Turn the knob to "Close".
- Turn off the power switch. Disconnect the power cord.
- Disconnect all hoses.
Step D: Push/Pull Liquid Mode
Notice: An electric scale is needed to monitor the recovery process and prevent overfilling.
- Connect the hoses firmly as shown in the diagram.
- Ensure all valves are closed.
- First, evacuate the air from the recovery machine: loosen the outlet hose, turn on the recovery machine, turn the knob to "FAST", then turn the knob to "PURGE", and turn off the recovery machine.
- Open the vapor valve of the air conditioning system, quickly release some refrigerant, and tighten the outlet hose.
- Open the liquid valve of the air conditioning system, slightly loosen the liquid hose connected to the tank, quickly release some refrigerant, and tighten it again.
- Open the vapor valve and liquid valve of the tank.
- Turn the knob to "FAST".
- Press the "ON" button to start the recovery machine.
- After recovering the liquid, slowly turn the knob to "PURGE" to initiate the purge mode.
- Close the vapor valve and liquid valve of the air conditioning system.
- Close the vapor valve and liquid valve of the tank.
- Reconnect and connect all hoses for STEP B - Recovery Mode.
- Turn the knob to "Close".
Troubleshooting:
| PROBLEM | CAUSE | SOLUTION |
|---|---|---|
| No power, indicator light does not respond | 1. Power cord is damaged. 2. Internal connection is loose. 3. Connection to J1 is damaged. 4. Malfunction of the circuit board. | 1. Replace the cable. 2. Check the connection. 3. Replace the connection. 4. Replace the MCB or DCN circuit board. Contact NAVAC technical service. |
| Machine does not operate after pressing the start switch | 1. The button was not held for more than 0.3s. 2. High-pressure protection switch is faulty, HP light is on. 3. OFP switch is off and OFP light is on. 4. Overload light is on. 5. Button is damaged. 6. Circuit board is damaged. | 1. Press the button again. 2. Check if the high-pressure switch connection is correct. 3. Check if the OFP switch connection is correct. 4.1. Check if the input voltage is correct. 4.2. Check if the connection between TS and MCB is correct. 4.3. Check if the connection between TP and DCB is correct. 4.4. Check if the connection between PS and DCB is correct. 4.5. Also error in vacuum, power failure, such as inability to rotate the impeller, it is a mechanical jam, return to the factory for repair; if it can rotate, replace the control board. 4.6. With load, turn the liquid recovery knob to "CLOSE", turn the gas knob to "PURGE", and then press the button to start the equipment. 5. Replace the button. 6. Replace the circuit board and contact NAVAC technical service. |
| Machine stops after operating for a period of time | 1. Malfunction causes the high-pressure switch to operate, turning on the high-pressure light. 2. Thermal protector action, overload lamp lights up. 3. Refrigerant is at 80% in the tank, and O.F.P. Cutoff is displayed. | 1. Refer to the USER MANUAL. 2. When the switch resets and the overload light flashes, you can restart the unit. 3. Replace the tank. When O.F.P Cutoff and Restart flash, press the Start switch. |
| Slow recovery rate | 1. Refrigerant tank pressure is too high. 2. Valve opening is too small. 3. Compressor piston ring is damaged. | 1. Cooling the tank helps reduce pressure. 2. Turn the knob to "FAST". 3. Contact NAVAC technical service. |
| Does not evacuate | 1. Connection hose is loose. 2. Machine has leaks. | 1. Tighten the connection hoses. 2. Contact NAVAC technical service. |
Correct Disposal of this Product:
This symbol indicates that this product should not be disposed of with other household waste. To prevent possible harm to the environment or human health from uncontrolled waste disposal, recycle it responsibly to promote the sustainable reuse of material resources. Contact the retailer where you purchased the product. They can take this product for environmentally safe recycling.
