Nissan Primera P12. Instruction — part 5
PREPARATION
ATC-13
C
D
E
F
G
H
I
K
L
M
A
B
ATC
(J-42220)
Fluorescent dye leak detector
Power supply: DC 12V (Battery
terminal)
For checking refrigerant leak when
fluorescent dye is installed in A/C
system.
Includes: UV lamp and UV safety
goggles
(J-41447)
HFC-134a (R-134a) Fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
Application: For HFC-134a (R-134a)
PAG oil
Container: 1/4 ounce (7.4 cc) bottle
(Includes self-adhesive dye
identification labels for affixing to
vehicle after charging system with
dye.)
(J-41459)
HFC-134a (R-134a) dye injector
Use with J-41447, 1/4 ounce
bottle
For injecting 1/4 ounce of fluorescent
leak detection dye into A/C system.
(J-43872)
Dye cleaner
For cleaning dye spills.
Manifold gauge set (with hoses
and couplers)
Identification:
●
The gauge face indicates HFC-134a
(R-134a).
Fitting size: Thread size
●
1/2
″
-16 ACME
Service hoses
●
High side hose
●
Low side hose
●
Utility hose
Hose color:
●
Low hose: Blue with black stripe
●
High hose: Red with black stripe
●
Utility hose: Yellow with black stripe
or green with black stripe
Hose fitting to gauge:
●
1/2
″
-16 ACME
Service couplers
●
High side coupler
●
Low side coupler
Hose fitting to service hose:
●
M14
×
1.5 fitting is optional or
permanently attached.
Tool number
Tool name
Description
SHA438F
SHA439F
SHA440F
SHA441F
RJIA0196E
S-NT201
S-NT202
ATC-14
PREPARATION
Refrigerant weight scale
For measuring of refrigerant
Fitting size: Thread size
●
1/2
″
-16 ACME
Vacuum pump
(Including the isolator valve)
Capacity:
●
Air displacement: 4 CFM
●
Micron rating: 20 microns
●
Oil capacity: 482 g (17 oz)
Fitting size: Thread size
●
1/2
″
-16 ACME
Tool number
Tool name
Description
S-NT200
S-NT203
REFRIGERATION SYSTEM
ATC-15
C
D
E
F
G
H
I
K
L
M
A
B
ATC
REFRIGERATION SYSTEM
PFP:KA990
Refrigerant Cycle
EJS003A2
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is
controlled by an externally equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION
Under usual operating conditions, when the A/C is switched on, the compressor runs continuously, and the
evaporator pressure, and therefore, temperature is controlled by the V-6 variable displacement compressor to
prevent freeze up.
Refrigerant System Protection
EJS003A3
REFRIGERANT PRESSURE SENSOR (EXCEPT YD ENGINE MODELS)
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-
sor, located on the liquid tank (or condenser). If the system pressure rises above, or falls below the specifica-
tions, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage
signal to the ECM. ECM makes the A/C relay go OFF and stops the compressor when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (27.5 bar, 28 kg/cm
2
, 398 psi),
or below about 134 kPa (1.37 bar, 1.4 kg/cm
2
, 20 psi).
DUAL-PRESSURE SWITCH (WITH YD ENGINE MODELS)
The refrigerant system is protected against excessively high or low pressures by the dual-pressure switch,
located on the liquid tank (or condenser). If the system pressure rises above or falls below the specifications,
the dual-pressure switch opens to interrupt the compressor operation.
PRESSURE RELIEF VALVE
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
When the pressure of refrigerant in the system increases to an unusual level [more than 3,727 kPa (37.3 bar,
38 kg/cm
2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refriger-
ant into the atmosphere.
RJIA2360E
ATC-16
REFRIGERATION SYSTEM
CSV-613 Variable Displacement Compressor (Except F9Q Engine Models)
EJS003A4
GENERAL INFORMATION
1.
The CSV-613 variable compressor differs from previous units. The vent temperatures of the CSV-613
variable compressor do not drop too far below 5
°
C (41
°
F) when:
Evaporator intake air temperature is less than 20
°
C (68
°
F).
Engine is running at speeds less than 1,500 rpm.
This is because the CSV-613 compressor provides a means of “capacity” control.
2.
The V-6 variable compressor provides refrigerant control under varying conditions. During cold winters, it
may not produce high refrigerant pressure discharge (compared to previous units) when used with air
conditioning systems.
3.
A “clanking” sound may occasionally be heard during refrigerant charge. The sound indicates that the tilt
angle of the swash plate has changed and is not a problem.
4.
For air conditioning systems with the CSV-613 compressor, the clutch remains engaged unless: the sys-
tem main switch, fan switch or ignition switch is turned OFF. When ambient (outside) temperatures are
low or when the amount of refrigerant is insufficient, the clutch is disengaged to protect the compressor.
5.
A constant range of suction pressure is maintained when engine speed is greater than a certain value. It
normally ranges from 147 to 177 kPa (1.47 to 1.77 bar, 1.5 to 1.8 kg/cm
2
, 21 to 26 psi) under varying con-
ditions.
In previous compressors, however, suction pressure was reduced with increases in engine speed.
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