Carrier NDK33BN0KB, Operation & Service Manual

Page: 225 / 270

62-61753-21 8-13
Procedure R-452A Recovery 2/2
10. Connect the vapour valve (F) of the R-452A
recovery bottle to the recovery machine.
The system is ready for vapour recovery.
R-452A vapour recovering
1. Open Vapour valve (F).
2. Start the Recovery machine.
3. Open hose (B) service valve
4. Open the manifold gauge valve (1,4).
The R-452A vapour is going from the com-
pressor to the R-452A recovery bottle.
All manifold gauge valves (1,2,3,4)
are opened.
5. Check the pressure values indicated on the
two manifold gauges.
Wait until the needles from the 2 mani-
folds gauges indicate -0,67 bar (-20
inchHg).
Do not go to the next step before
reaching
-0,67bar (-20 inchHg) in order to pre-
vent flare up of residual refrigerant.
This specific effect has to be taken into
account especially in case of work in
height (fall risk).
The R-452A is recovered
6. Close hose (B) service valve.
7. Close the manifold gauges service valve (2).
8. Stop the recovery machine.
9. Wait for 15 minutes
After 15 minutes

If pressure has raised:
Repeat the Recovery procedure from step 1

If -0,67 bar (-20inchHg) maintained
Go to next step
10. Disconnect the recovery machine.
Dispose the R-452A recovery bottle accord-
ing local legislation.
End of recovery procedure
11. Purge with Nitrogen.
For more information about nitrogen
instruction:
Refer to the brazing instruction 98-60068-
00 available from CTE partner
The refrigerant circuit is ready for unbrazing
operation.
Perform unbrazing operation under nitrogen.
Unit connection
Evaporator connection