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Nissan X-Trail 32. Manual - part 1338
PRECAUTIONS
HA-11
< PRECAUTION >
[R9M (EXCEPT FOR RUSSIA)]
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The lubricant contained inside the vacuum pump is not compatible
with the specified lubricant for HFO-1234yf (R-1234yf) A/C systems.
The vent side of the vacuum pump is exposed to atmospheric pres-
sure. So the vacuum pump lubricant may migrate out of the pump
into the service hose. This is possible when the pump is switched
OFF after evacuation (vacuuming) and hose is connected to it.
To prevent this migration, use a manual valve placed near the hose-
to-pump connection, as per the following.
• Vacuum pumps usually have a manual isolator valve as part of the
pump. Close this valve to isolate the service hose from the pump.
• Use a hose equipped with a manual shut-off valve near the pump
end for pumps without an isolator. Close the valve to isolate the
hose from the pump.
• Disconnect the hose from the pump if the hose has an automatic
shut-off valve. As long as the hose is connected, the valve is open
and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under no vacuum condition. Such valves may restrict the pump’s
ability to pull a deep vacuum and are not recommended.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates HFO-1234yf or R-1234yf. Be sure the gauge set has 1/2
″
-16 ACME
threaded connections for service hoses. Confirm the set has been used only with refrigerant HFO-1234yf (R-
1234yf) and specified lubricants.
SERVICE HOSES
Be certain that the service hoses display the markings described. All hoses must equip positive shut-off
devices (either manual or automatic) near the end of the hoses opposite to the manifold gauge.
SERVICE COUPLERS
Never attempt to connect HFO-1234yf (R-1234yf) service couplers
to the CFC-12 (R-12) and HFC-134a (R-134a) A/C system. The
HFO-1234yf (R-1234yf) couplers do not properly connect to the
CFC-12 (R-12) and HFC-134a (R-134a) system. However, if an
improper connection is attempted, discharging and contamination
may occur.
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFO-1234yf (R-1234yf) and specified lubricants have been used with the
scale. The hose fitting must be 1/2
″
-16 ACME if the scale controls refrigerant flow electronically.
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder’s top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.
RHA270DA
Shut-off valve rotation
A/C service valve
Clockwise
Open
Counterclockwise
Close
RHA273D