NAVAC NRDDF User Manual page 9

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 Fault3
3. Fault 4 or Fault 8
4. Fault 7
5. Button is damaged.
6. Circuit board is damaged.
Machine does
not run after
pressing START
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. low pressure protection switch is on.
Pressure sensor is not connected well
E1 shows at LP
or HP or is open circuit.
1. The pressure of the refrigerant tank
Slow recovery is too high.
rate
2. The valve is not open enough.
3. Piston ring of compressor is damaged.
1. Connection hose is loose.
Not evacuate
2. Machine leaks.
Attention
If
you
have
the
compressor
repaired
in
any
circumstances,
please
do
a
leak
test
before
use
and
make
sure

there's
no
leak.
How to do the leak test:
1. Block the outlet port with a ball valve, keep the inlet in connection with the atmosphere;
2. Turn the knob to the "FAST" and start the machine. When the outlet pressure rises to 30bar, press the "STOP",
and then turn the knob to the "PURGE".
3. Leave it alone for 30 minutes. Check the reading of the low pressure gauge. If the pressure is higher than 15bar,
then it passes the test. If it is lower than 13bar, there a leak; if it is between 13bar and 15bar, leave it for another
30 minutes. If the pressure drops ≤ 2bar, then it passes the test
14
SOLUTION
1. Replace cord.
2. Check the connection.
3. Replace the connect.
4. Replace MCB or DCN circuit board.
Contact NAVAC tech support
1. Check if the connection between
HP or OFP to DCB is good.
2.1 Adjust to correct voltage.
2.2 If the voltage is correct, replace the MCB
3.1 If this happens only when starting the machine:
for liquid recovery, turn the knob to "CLOSE",
for gas recovery, turn the knob to "PURGE",
press "START" again to start the machine,
and turn the knob to "FAST".
3.2 Only when inlet pressure is too high or fluid
hammer happens , turn the knob to "SLOW"
3.3 When error occurs at no load, power off the
machine and check if the fan can be manually
rotated. If yes, replace the control board. If not,
send the machine back to the factory for repair.
4. Check if the connection between TP and MCB
is good. If good, contact NAVAC tech support.
5/6. Replace the front side plate with digital
manifold gauge.
1. Refer to section 6 of OPERATION MANUAL 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. See refer to self-cleaning operation steps for
self-cleaning.
Check if the connection between LS or HS to DCB
is good. If good, replacepressure sensor.
1. Cooling the tank help decrease the pressure.
2. Turn the knob towards "FAST".
3. Contact NAVAC tech support.
1. Tighten the connection hosed.
2. Contact NAVAC tech support.
15