New Holland CX720 Repair Manual page 3071

BODY AND STRUCTURE - ENVIRONMENT CONTROL Air-conditioning system
ENVIRONMENT CONTROL Air-conditioning system - Discharging
(E.40.C - F.35.A.31)
1. Refrigerant Recovery Procedure
2. Ensure that all service equipment hose lines are fit-
ted with shutoff valves or check valves within 30 cm
(12 in) of their ends. This will ensure that only min-
imal quantities of refrigerant escape to the atmos-
phere when the equipment is disconnected from the
A/C system, and that only small amounts of moisture
and other contaminants can enter the system.
Be sure that all equipment including the connecting
3.
hose lines and manifold are compatible with the re-
frigerant in the system with which you are going to
work, and that your equipment has been previously
used only with the refrigerant you are about to re-
cover.
4. Be sure that all shutoff valves are tight before con-
necting them to the A/C system.
Shutoff valves should be closed at all times unless
they are connected to a vehicle's A/C system, a re-
frigerant storage container, or another piece of service
equipment containing the same refrigerant. This pre-
vents refrigerant from escaping into the atmo Z021
5. Connect the extraction or recovery equipment to the
A/C system in accordance with the instructions sup-
plied by the equipment manufacturer.
6. Start the recovery process by turning on the recov-
ery equipment and extracting the refrigerant from the
A/C system in accordance with the equipment man-
ufacturer's instructions.
7. Continue to extract refrigerant until the A/C system
has been brought under a vacuum and there is no
refrigerant remaining in the vehicle system.
8. Verify that there is no refrigerant remaining in the
system by:
9. Shutting off the recovery unit and observing the sys-
tem pressure level.
10. Waiting five minutes and observing the system pres-
sure again. If the system pressure has not risen
above atmospheric pressure (0 gauge pressure), all
the refrigerant has been removed and you may pro-
ceed to step 8.
If, after five minutes, the system pressure reading
has risen above atmospheric pressure (0 gauge
pressure), the extraction/recovery process must be
repeated until the pressure reading remains at or
below atmospheric for at least two minutes with the
recovery equipment shut off before proceeding to
step 8.
11. Close the shutoff valves in the service lines.
CAUTION
2 4/7/2006
E.40.C / 43