Infiniti Q45. Manual — part 105
PREPARATION
ATC-15
C
D
E
F
G
H
I
K
L
M
A
B
ATC
(J-43926)
Refrigerant dye leak detection kit
Kit includes:
(J-42220)
UV lamp and UV safety goggles
(J-41459)
HFC-134a (R-134a) dye injector
Use with J-41447, 1/4 ounce
bottle
(J-41447)
HFC-134a (R-134a) fluorescent
leak detection dye
(Box of 24, 1/4 ounce bottles)
(J-43872)
Refrigerant dye cleaner
Power supply:
DC 12 V (Battery terminal)
(J-42220)
UV lamp and UV safety goggles
Power supply:
DC 12 V (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 (7.4cc) 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)
Refrigerant dye cleaner
For cleaning dye spills
(J-39183)
Manifold gauge set (with hoses
and couplers)
Identification:
●
The gauge face indicates HFC-134a
(R-134a).
Fitting size: Thread size
●
1/2
″
-16 ACME
Tool number
(Kent-Moore No.)
Tool name
Description
ZHA200H
SHA438F
SHA439F
SHA440F
SHA441F
RJIA0196E
ATC-16
PREPARATION
Commercial Service Tools
NJS0007T
Service hoses
●
High-pressure side hose
(J-39501-72)
●
Low-pressure side hose
(J-39502-72)
●
Utility hose
(J-39476-72)
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-pressure side coupler
(J-39500-20)
●
Low-pressure side coupler
(J-39500-24)
Hose fitting to service hose:
●
M14 x 1.5 fitting is optional or
permanently attached.
(J-39650)
Refrigerant weight scale
For measuring of refrigerant
Fitting size: Thread size
●
1/2
″
-16 ACME
(J-39649)
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
(Kent-Moore No.)
Tool name
Description
S-NT201
S-NT202
S-NT200
S-NT203
Tool name
Description
Refrigerant identifier equipment
Checking for refrigerant purity and
system contamination
Power tool
For loosening bolts and nuts
RJIA0197E
PBIC0190E
REFRIGERATION SYSTEM
ATC-17
C
D
E
F
G
H
I
K
L
M
A
B
ATC
REFRIGERATION SYSTEM
PFP:KA990
Refrigerant Cycle
NJS0007U
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 is
controlled by an externally equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION
To prevent evaporator frozen up, the evaporator air temperature is monitored, and the voltage signal to the A/
C auto amp. will make the A/C relay go OFF and stop the compressor.
Refrigerant System Protection
NJS0007V
REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low- pressures by the refrigerant pressure
sensor, located on the condenser. If the system pressure rises above, or falls below the specifications, 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 (28 kg/cm
2
, 398 psi), or below about 134 kPa
(1.4 kg/cm
2
, 20 psi).
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 (38 kg/cm
2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the
atmosphere.
RJIA0849E
ATC-18
REFRIGERATION SYSTEM
V-6 Variable Displacement Compressor
NJS0007W
GENERAL INFORMATION
1.
The V-6 variable compressor differs from previous units. The vent temperatures of the V-6 variable com-
pressor 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 V-6 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 wobble (swash) plate has changed and is not a problem.
4.
For air conditioning systems with the V-6 compressor, the clutch remains engaged unless: the system
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.
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