Infiniti Q45. Manual — part 103
PRECAUTIONS
ATC-7
C
D
E
F
G
H
I
K
L
M
A
B
ATC
●
The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facil-
itating piping connections.
O-RING AND REFRIGERANT CONNECTION
CAUTION:
The new and former refrigerant connections use different O-ring configurations. Never confuse O-
rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or
around, the connection.
SHA815E
RJIA1259E
ATC-8
PRECAUTIONS
O-Ring Part Numbers and Specifications
WARNING:
Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is
less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it.
CAUTION:
When replacing or cleaning refrigerant cycle components, observe the following.
●
When the compressor is removed, store it in the same way as it is when mounted on the car. Fair-
ule to do so will cause lubricant to enter the low-pressure chamber.
●
When connecting tubes, always use a torque wrench and a back-up wrench.
●
After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
●
When installing an air conditioner in the vehicle, connect the pipes at the final stage of the opera-
tion. Never remove the seal caps of pipes and other components until just before required for con-
nection.
●
Allow components stored in cool areas to warm to working area temperature before removing seal
caps. This prevents condensation from forming inside A/C components.
●
Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
●
Always replace used O-rings.
●
When connecting tube, apply lubricant to circle of the O-rings shown in illustration. Be careful not
to apply lubricant to threaded portion.
●
O-ring must be closely attached to dented portion of tube.
●
When replacing the O-ring, be careful not to damage O-ring and tube.
●
Connect tube until a click can be heard, then tighten the nut or bolt by hand until snug. Make sure
that the O-ring is installed to tube correctly.
Connec-
tion type
O-ring
size
Part number
D
mm (in)
W
mm (in)
New
8
92471 N8210
6.80 (0.2680)
1.85 (0.0728)
Former
92470 N8200
6.07 (0.2390)
1.78 (0.0701)
Former
10
J2476 89956
9.25 (0.3642)
1.78 (0.0701)
New
12
92472 N8210
10.90 (0.429)
2.43 (0.0957)
Former
92475 71L00
11.00 (0.433)
2.40 (0.0940)
New
16
92473 N8210
13.60 (0.535)
2.43 (0.0957)
Former
92475 72L00
14.30 (0.563)
2.30 (0.0910)
New
19
92474 N8210
16.50 (0.650)
2.43 (0.0957)
Former
92477 N8200
17.12 (0.674)
1.78 (0.0701)
New
24
92195 AH300
21.80 (0.858)
2.40 (0.0940)
SHA814E
Lubricant name
: Nissan A/C System Oil Type S
PRECAUTIONS
ATC-9
C
D
E
F
G
H
I
K
L
M
A
B
ATC
●
After connecting line, perform leak test and make sure that there is no leakage from connections.
When the refrigerant leaking point is found, disconnect that line and replace the O-ring. Then
tighten connections of seal seat to the specified torque.
Precautions for Servicing Compressor
NJS0007N
●
Plug all openings to prevent moisture and foreign matter from entering.
●
When the compressor is removed, store it in the same way 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
NJS0007O
RECOVERY/RECYCLING EQUIPMENT
Be certain to follow the manufacturer’s 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 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 or R-134a. Be
sure the gauge set has 1/2
″
-16 ACME threaded connections for ser-
vice 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 to the manifold gauge.
RHA270DA
SHA533D
RHA272D
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