NAVAC NR7 Compatible Refrigerant Recovery Unit User Manual

Recovery Unit
NR7
User Manual

Failure to folow warnings could resultin death or serious Injury.
SAVE THIS MANUAL FOR FUTURE REFERENCE

GENERAL SAFETY

Use information

• In order to prolong the lfe cycle of the recovery unit, please read the manual carefully before using to fully Understand the safety, specification as well as operating procedure of the recovery unit

• Please check the product received is 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

Waming
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 qualiied technician should operate this recovery unit.
Before starting the equipment, make sure that it is well grounded.
If using electrical extension cord, the cord must be in good condition and properly connected and grounded.
Only a qualiied electrician can do the wire connection according to the technical standard and circuit diagram
“The power must be cut off and o display in 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 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 over fil the recovery tank, maximum at 80% capacity to make sure that there is enough space for liquid expansion. Overfilling of the tankmay cause a violent 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.
Adigital scale is needed to prevent overfilling Be sure that the place where you are working is thoroughly ventilated.
Notice
Be sure the unitis working under the right power supply.
When using an extension cord it should be minimum 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 26bar (377.0psi)
The unit need to be laid in horizontally, otherwise it will lead to unexpected vibration, noise o even abrasion
Do not expose the equipment to sun for extended period o rain.
The ventilation opening of the unit must not be blocked
If the overload protector pops, reposition it after 5 minutes.
When doing 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 fluid hammer happens in the recovery, please turn the knob slowly to “SLOW ” position and
do notelet reading pressure drop to zero
When you select fast model to start work ,please monitor output pressure, if the output pressure increase fast to 27bar(381.6 psi).please turn to slow mode slowly and monitor the outlet pressure not exceeding 35bar(507.6 psi)
‘The equipment s intended for serving air-conditioning and refrigeration systems containing less than 2001bs of high-pressure refrigerant
The tank and hose used must comply with the local regulations.

OPERATION MANUAL

1. Connect the power supply, rocker switch is in the “~” position the indicator light is on for 2 seconds and then ot press the button keep 1 for mores han 0.2 seconds and hen release It f stat th device alteran interval of mora than 0.5, press the button   keep f for more han 0.2 seconds and then tales 10 tui of the deice, afar an nerval of moors than 2 seconds, Ress the button start e devie.
2. Do not mix different refrigerants together in one tank, otherwise they could not be separated or used.
3. Before recovering the refiigerant, the tank should achieve the vacuum level: -29.6inHg, for purge non- condensable 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. Al the valves must be closed, the input and output fitings 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. After drier should always be used and should be replaced regularly. And each type of refrigerant must have its own filter. For the sake of ensuring the normal operation of the unit, please use high-quality filter drier specified. A high quality filter drier will help protect machine.
6. Special-caution is needed when recovering from system, and two dry filters are needed.
7. The unit has an Internal High Pressure protector. f the pressure inside the system is above rated shut-off pressure (see specification), compressor will automatically shut off and the HP cutoff shows: To restart the compressor, please lower the intemal pressure (Output gauge indicates lower than35 bar/507 6 PSI), after the HP culoff biinks, then Press the “START” button to restart the compressor. When high pressure protection initates, please determine the cause and deal with it before restarting the unit, The input valve of the refrigerant tank is closed—opening the valve willhelp solve the problem. The connecting hose between the recovery unit and refrigerant tank is plugged —close all the valves and replace the connecting hose. The temperature of the refrigerant tank s too high, causing high pressure— cool the tank down.
8. The unitis equipped with an O.F.P. socket and can be connected to a cylinder with a ful liquid protection output using the O.FP. connection cable. When the O.F.P. cable is not plugged in, the unit automatically blocks the O.F.P. function
9. When recovering a large amount of liquid refrigerant, it is recommended to use the *push-pull mode”.
10. To ensure that there is no refrigerant in the equipment after recovery, please read the “self-cleanin ‘operation procedure in this instruction manual carefully. The residual liquid refrigerant in the condenser may expand and cause damage to the components.
11. 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
12. 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 0.2 seconds then release to start the unit, press again after 0.5 seconds to stop the unit.

• Overload: Overload warning
• O.F.P Cutoff: Will Light up when the recovery cylinder is 80% filled, o if the O.F.P cable is shorted. The machine will stop running,
• HP Cutoff: Will Light up when high pressure switch is activated above 560 Psi.
• Close: Intake valve closed
• Recover: Intake valve partially open
• AST: 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

Graphics code item HS I High pressure sensor M Motor
MCB Motor control board XS Socket DCB Indicator board LS Low pressure sensor OFP Over filling protector TP Temperature protector HP High pressure switch TS Temperature sensor PS Start/Stop switch RS Rocker switch Li High pressure alarm indicator L2 Full liquid alarm indicator L3 Overload alarm indicator

OPERATING INSTRUCTION

STEP A: Hoses Evacuation

Connect the hoses tight as shown in the diagram above.

1. Confirm the vapor valve and liquid valve of AC system are in close position.
2. Confirm the vapor valve and liquid valve of recovery tank are in close position.
3. Open the vapor and liquid valves of manifold gauge.
4. Loosen the connecting hoses of refrigerant tank.
5. Open the check valve of hoses.
6. Plug in the machine, turn on the power.
7. Turn the knob to “Fast”.
8. Press “ ” switch to start the machine, start vacuum air out of the hose.
9. Observe the low pressure gauge, make sure the pointer is in the range of “-76cmHg–0” for 30$
10. Turn the knob to “CLOSE” position, then slowly turn to the “PURGE” position to start purging the remaining air in the recovery machine.
11. Observe the low pressure gauge, make sure the pointer is in the range of “-76cmHg-0” for 30s.
12. Connect the refrigerant hose to the tank.
13. Turn the knob to “CLOSE”.
14. Press “ ” to stop the recovery machine.

STEP B: Recovery Mode
Notice
An electric scale is needed to monitor the recovery process to prevent overfilling.

Connect the hoses tight as shown in the diagram above. Make sure all valves are closed.

1. Open the vapor and liquid valves of AC system.

2. Open the vapor valve of the manifold gauge.

3. Turn the knob to “FAST”

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

5. Close the vapor valve of the manifold gauge.

6. Open the connection of the corresponding tank (vapor recovery to the liquid port, liquid recovery to the vapor port )

7. Press “ ” switch to start the machine.

8. a. If recover liquid refrigerant, please open the liquid valve of the manifold gauge.
   8.b. If recover vapor refrigerant, please open the vapor valve of the manifold gauge.

9. Run to desired vacuum level to finish recovery. Once reached, please turn knob to purge to start the purging process.

Notice

1. If fluid hammer happens in the recovery, please turn the knob to “Slow” position slowly, then the reading of low pressure gauge drops until fluid hammer stops; but do not let reading pressure drop to zero, otherwise inlet port is not pumping once at zero pressure.
2. If it is difficult to start, turn to “CLOSE” when liquid, turn to “PURGE” when vapor, then press “ ” to restart the machine, and turn to the required position.

STEP C: Purge Mode
Notice
The recovery machine must be purged after each use; Liquid refrigerant remained may expand and damage the components and pollute the environment.

1. Once desired vacuum level is reached, tum the knob to PURGE” and start purging.
2. Observe the low pressure gauge, let run to desired vacuum level.
3. Press switch to stop the recovery machine.
4. Close the vapor valve of the tank.
5. Disconnect outlet hoses (note: residual refrigerant remain in hose)
6. Turn the knob to “Close”.
7. Turn off the power switch Disconnect power cord.
8. Disconnect all hoses.

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

Connect the hoses tight as shown in the diagram above. Make sure all valves are closed. Exhaust the air in the recovery machine first: Loosen the outlet hose, turn on the recovery machine, turn the knob to “FAST”, and then turn the knob to “PURGE”, turn off the recovery machine.

1. Open the vapor valve of the AC system, quickly release some refrigerant, and tighten the outlet hose.
2. Open the liquid valve of the AC system, slightly loosen the liquid hose connected at the tank, quickly release some refrigerant, and tighten it back.
3. Open the vapor vatve, liquid valve of the tank.
4. Turn the knob to “FAST”
5. Press : button to start recovery machine.
6. After liquid is recorved, turn the knob slowly to “PURGE’ to start purging made.
7. Close the vapor valve. liquid valve of the AC system.
8. Close the vapor valve, liquid valve of the tank.
9. Disconnect and reconnect all the hoses tor STEP B – Recovery mode.
10. Tum the knob to “Close”.

TROUBLE SHOOTING

2. Inner connection is loose.
3. Connect to J1 is damaged.
4. Malfunction of circuit board.| 1. Replace cord.
2. Check the connection.
3. Replace the connect.
4. Replace MCB or DCN circuit board. Contact NAVAC tech support.
Machine does not run after pressing Start switch| 1. Pressing the button is not maintained for more than 0.3 s.
2. High pressure protection switch is broken, HP light is on.
3. OFP switch is off, OFP light is on.
4, Overload lamp is on.
5. Button is damaged.
5. Circuit board is damaged.| 1. Re-press the button.
2. Test whether the connection of the high-voltage switch is good.
3. Test if the connection of OFP switch is good.
4.1. Check if the input voltage is correct.
4.2. Check if the connection between TS and MCB is good or not.
4.3. Check if the connection between TP and DCB is good or not.
4.4. Check if the connection between PS and DCB is good.
4.5, No-load also error, power failure, such as can not rotate the wind blade, is a mechanical stagnation, return to the factory for repair, it it can rotate, replace the control board.
4.6. with load, liquid recovery knob rotated to “CLOSE” position, gas knob rotated to “PURGE” position, and then press the button to start the equipment
5. Replace the button.
6. Replace the circuit board and contact NAVAC. tech support.
Machine stops after running a period of time| 1. Misoperation causes high pressure switch to operate, HP light up.
2. Thermal protector action, overload lamp lights up
3. Refrigerant is 80% in the tank, and O.F.P Cutoff shows.| 1. Please read the OPERATION MANUAL carefully.
2. When the switch is reset and the Overload light is blinking, you can reboot the device.
3. Replace the tank. When O.F.P Cutoff and Restart flash, press Start Switch.
Slow recovery rate| 1. The pressure of the refrigerant tank is too high.
2. Valve opening too small
3. Piston ring of compressor is damaged.| 1. Tighten the connection hoses.
2. Contact NAVAC tech support.
Not evacuate| 1. Connection hose is loose.
2. Machine leaks.| 1. Tighten the connection hoses.
2. Contact NAVAC tech support.

Correct Disposal of this product:
This marking indicates that this product should not be disposed 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 environmental safe recycling.

NAVAC Inc.
www.NavacGlobal.com
Tel/Fax: +1 877 MY-NAVAC
877 696 2822
MADE IN PRC

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