Liquid Push/Pull Mode; Trouble Shooting - NAVAC MASTER Series User Manual

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OPERATING INSTRUCTION

4). Liquid push/pull mode

A Notice
A digital scale is needed to monitor the
recover process to prevent overfilling.
Vapor valve
r-:::;: == == :::::,,.�
QDII
liquid valve
____,_ _ __ am
Refrigerant
equipment
Use NVR1 valve core removal for faster recovery speed.
Ready for operation
Connect the hoses correctly and firmly.
( Please refer to the connection diagram)
Make sure all valves are closed.
Start operation
1.Open the vapor valve, liquid valve of the HVAC system.
2.0pen the vapor valve, liquid valve of the tank.
3.Press "START" button to start machine, then ii starts liquid
push/pull mode.
4.Tum the knob to "Recover".
If the reading on the scale keeps the same or changes
slowly, it means liquid in HVAC system has been
recovered and vapor recovery mode can be underway.
12
NAYfAC
Liquid valve
lopen(2)
( NRDC4M )
Refrigerant tank
5.Turn the knob slowly to "Purge" and start self purging
mode for the liquid.
6.Turn the knob to "Close".
7 .Close the vapor valve, liquid valve of the HVAC system.
8. Close the vapor valve, liquid valve of the tank.
9.Reconnect the hoses and start recovery mode for the
vapor.
Finish operation
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TROUBLE SHOOTING

PROBLEM CAUSE
1. Power cord is damaged.
LCD does not
2. Inner connection is loose.
work after
3. Connect to J6 is damaged.
power is on
4. Malfunction of circuit board.
1. HP Cutoff, or OFP Cutoff works
(screen shows)
2. Fault 2 or Fault 3
3. Fault 4 or Fault 8, over load
4. Fault 5
5. Fault6
Machine does
6. Fault 7 or Fault 12
not run after
7. Fault g or Fault 10
pressing START
8. Fault 11
9. Button is damaged
10. Circuit board is damaged
1. Misoperation causes HP Cutoff.
2.
Thermal protector is on and shows
Fault 7.
Machine stops
3. Refrigerant is 80% in the tank, and
after running a
O.F.P Cutoff shows.
period of time
4. Recovery work is finished. LP
Cutoff shows.
E1 shows at LP Pressure sensor is not connected well
or HP or is short circuit.
1. The pressure of the refrigerant tank 1 . Cooling the tank help decrease the
Slow recovery is too high.
2. Piston ring of compressor is
rate
damaged.
1. Connection hose is loose.
Not evacuate
2. Machine leaks.
NAYfAC
SOLUTION
1. Replace cord.
2. Check the connection.
3. Replace the connect.
4. Replace MCB or DCN circuit board.
Contact NAVAC techsupport.
1. Check if the connection between
HP or OFP to DCB is good.
2. Adjust to correct voltage.
3. Turn knob to close. Press START.
4. Check if the connection between TS
and MCB is good. If good, contact
NAVAC techsupport.
5. Check if TS connection is damaged.
If not, contact NAVAC techsupport.
6. Check if the connection between TP
and MCB is good. If good.
7. Replace digital control board.
8. Replace circuit board.
9. Cool down the machine.
10. Check if connection wire between
motor and MCB is good.If good,
contact NAVAC techsupport.
1. Refer to section 6 of OPERATION
on page 3.
2.
When Fault 7 and Restart flash,
press START.
3. Replace the tank. When O.F.P
Cutoff and Restart flash, press
START.
4. Could restart with pressure rise.
Check if the connection between LS or
HS to DCB is good. If good, replace
pressure sensor.
pressure.
2. Contact NAVAC techsupport.
1. Tighten the connection hoses.
2. Contact NAVAC techsupport.
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