Infiniti F50. Manual - part 121

PRECAUTIONS

ATC-9

ATC

●

After connecting line, conduct leak test and make sure that there is no leakage from connections.
When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten con-
nections of seal seat to the specified torque.

Precautions for Servicing Compressor

EJS0008U

●

Plug all openings to prevent moisture and foreign matter from entering.

●

When the compressor is removed, store it in the same position as it is when mounted on the car.

●

When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compres-
sor” exactly. Refer to

ATC-23, "Maintenance of Lubricant Quantity in Compressor"

●

Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with lubri-
cant, wipe it off by using a clean waste cloth moistened with thinner.

●

After compressor service operation, turn the compressor shaft by hand more than five turns in
both directions. This will equally distribute lubricant inside the compressor. After the compressor
is installed, let the engine idle and operate the compressor for one hour.

●

After replacing the compressor magnet clutch, apply voltage to the new one and check for normal
operation.

Precautions for Service Equipment

EJS0008V

RECOVERY/RECYCLING EQUIPMENT

Be certain to follow the manufacturers instructions for machine operation and machine maintenance. Never
introduce any refrigerant other than that specified into the machine.

ELECTRONIC LEAK DETECTOR

Be certain to follow the manufacturer's instructions for tester operation and tester maintenance.

RHA861F

ATC-10

PRECAUTIONS

VACUUM PUMP

The lubricant contained inside the vacuum pump is not compatible
with the specified lubricant for HFC-134a (R-134a) 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 follows.

●

Usually vacuum pumps have a manual isolator valve as part of
the pump. Close this valve to isolate the service hose from the
pump.

●

For pumps without an isolator, use a hose equipped with a man-
ual shut-off valve near the pump end. Close the valve to isolate
the hose from the pump.

●

If the hose has an automatic shut off valve, disconnect the hose
from the pump. 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 a 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 HFC-134a (R-134a or
134a). Be sure the gauge set has 1/2

″

-16 ACME threaded connec-

tions for service hoses. Confirm the set has been used only with
refrigerant HFC-134a (R-134a) and specified lubricants.

SERVICE HOSES

Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive shut
off devices (either manual or automatic) near the end of the hoses
opposite the manifold gauge.

RHA270DA

SHA533D

RHA272D

PRECAUTIONS

ATC-11

ATC

SERVICE COUPLERS

Never attempt to connect HFC-134a (R-134a) service couplers to an
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. However, if an
improper connection is attempted, discharging and contamination
may occur.

REFRIGERANT WEIGHT SCALE

Verify that no refrigerant other than HFC-134a (R-134a) and speci-
fied lubricants have been used with the scale. If the scale controls
refrigerant flow electronically, the hose fitting must be 1/2

″

-16

ACME.

CALIBRATING ACR4 WEIGHT SCALE

Calibrate the scale every three months.
To calibrate the weight scale on the ACR4 (J-39500-INF):

Press Shift/Reset and Enter at the same time.

Press 8787 . “A1 ” will be displayed.

Remove all weight from the scale.

Press 0 , then press Enter . “0.00 ” will be displayed and change to “A2 ”.

Place a known weight (dumbbell or similar weight), between 4.5 and 8.6 kg (10 and 19 lb) on the center of
the weight scale.

Enter the known weight using four digits. (Example 10 lb = 10.00, 10.5 lb = 10.50)

Press Enter — the display returns to the vacuum mode.

Press Shift/Reset and Enter at the same time.

Press 6 — the known weight on the scale is displayed.

10. Remove the known weight from the scale. “0.00 ” will be displayed.

11. Press Shift/Reset to return the ACR4 to the program mode.

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.

Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

RHA273D

RHA274D

ATC-12

PRECAUTIONS

Precautions for Leak Detection Dye

EJS0008W

●

The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet
(UV) lamp is required to illuminate the dye when inspecting for leaks.

●

Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of
the fluorescent dye.

●

The fluorescent dye leak detector is not a replacement for an electronic refrigerant leak detector. The fluo-
rescent dye leak detector should be used in conjunction with an electronic refrigerant leak detector to (J-
41995) pin-point refrigerant leaks.

●

For your safety and your customer's satisfaction, read and follow all manufacture's operating instructions
and precautions prior to performing the work.

●

A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal
should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995).

●

Always remove any remaining dye from the leak area after repairs are complete to avoid a misdiagnosis
during a future service.

●

Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled,
clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period
of time cannot be removed.

●

Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.).

●

Do not use more than one refrigerant dye bottle (1/4 ounce /7.4 cc) per A/C system.

●

Leak detection dyes for HFC-134a (R-134a) and CFC-12 (R-12) A/C systems are different. Do not use
HFC-134a (R-134a) leak detection dye in CFC-12 (R-12) A/C system or CFC-12 (R-12) leak detector dye
in HFC-134a (R-134a) A/C systems or A/C system damage may result.

●

The fluorescent properties of the dye will remain for over three (3) years unless a compressor malfunction
occurs.

IDENTIFICATION

NOTE:
Vehicles with factory installed fluorescent dye have a green label.
Vehicles without factory installed fluorescent dye have a blue label.

IDENTIFICATION LABEL FOR VEHICLE

Vehicles with factory installed fluorescent dye have this identification
label on the front side of hood.

Wiring Diagrams and Trouble Diagnosis

EJS00091

When you read wiring diagrams, refer to the following:

●

GI-13, "How to Read Wiring Diagrams"

in GI section.