Infiniti Q45. Manual - part 105

PREPARATION

ATC-15

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

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

, 398 psi), or below about 134 kPa

(1.4 kg/cm

, 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

, 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

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.

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.

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.

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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