NAVAC NRDDF User Manual page 7

Preparation
It's required to use hoses with ball valves on this
recovery machine. Connect the hose correctly and firmly
(see diagram above)
1. Check the refrigeration device and make sure the gas
valve and liquid valve are closed.
2. Check the refrigerant tank and make sure the gas valve
and liquid valve are closed.
3. Open the gas valve and liquid valve of the manifold
gauge.
4. Open the ball valves on the recovery machine outlet
and valves on the hose connected to the outlet
5. Power on the recovery machine, the LCD screen will
display the inlet and outlet pressures.
6. Turn the knob to "FAST".
10
Ball valve
4
NRDDF
Start
.

7 Start the vacuum pump and let it run until the
recovery machine's display (low pressure)
shows above -20inHg.
.

8 Close the ball valve of the vacuum pump hose
which is connected to the refrigerant tank.
9. Turn the knob to "Close".
10. Connect the recovery machine outlet to the
refrigerant tank with a hose.
Ball valve
4
8
Preparation
Connect the hoses correctly and firmly.
(Please refer to the connection diagram)
Make sure all valves are closed.
1. Switch off the power of refrigerant equipment.
2. Open the vapor and liquid valves of refrigerant
equipment.
3. Open the vapor valve of the refrigerant tank.
4. Open the ball valves on the hose connected to
the recovery machine outlet
Start operation
5. Press the "START" button to start machine.
6. Turn the knob to "Recover".
7.a. If recover liquid refrigerant, please open the liquid
valve of the manifold gauge.
b. If recover vapor refrigerant, please open the vapor
valve of the manifold gauge.
7 7
NRDDF
6
8. Recovery is completed when machine enters into
a vacuum. In Automatic shutoff this would be at
-20inHg
9. When recovery is completed, you can run
self-purging right away without powering off.
Notice
If
liquid
hammer
happens
in
the
recovery,
please

slowly
turn
the
knob
to
"Slow"
position,
let
the

reading
of
the
low-pressure
gauge
drops
until
liquid

hammer
stops.
Do
not
let
the
reading
drop
to
zero,

otherwise
the
inlet
port
will
not
pump.
If it is difficult to start, turn to "CLOSE" when liquid,
turn to "PURGE" when vapor, then press "START"
to restart the machine, and turn to the required
position.
Ball valve
4
11