Infiniti M35/M45 Y50. Manual - part 117

 

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Infiniti M35/M45 Y50. Manual - part 117

 

 

PREPARATION

ATC-19

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ATC

Commercial Service Tools

NJS000FY

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

ATC-20

REFRIGERATION SYSTEM

REFRIGERATION SYSTEM

PFP:KA990

Refrigerant Cycle

NJS000FZ

REFRIGERANT FLOW

The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in 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
unified meter and A/C amp. will make the A/C relay go OFF and stop the compressor.

Refrigerant System Protection

NJS000G0

REFRIGERANT PRESSURE SENSOR

The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the liquid tank. If the system pressure rises above, or falls below the specifications, the refriger-
ant 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 3,119 kPa (31.8 kg/cm

2

 , 452 psi), or below about 118

kPa (1.2 kg/cm

2

 , 17 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 3,628 kPa (37 kg/cm

2

, 526 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into the
atmosphere.

RJIA1552E

REFRIGERATION SYSTEM

ATC-21

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ATC

Variable Displacement Compressor

NJS000G1

GENERAL INFORMATION

1.

The 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 condi-
tioning systems.

2.

For air conditioning systems with the 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.

ATC-22

REFRIGERATION SYSTEM

DESCRIPTION
General

The variable compressor is a swash plate type that changes piston stroke in response to the required cooling
capacity.
The tilt of the swash plate allows the piston’s stroke to change so that refrigerant discharge continuously
change from approx. 0 to 171 cm

3

  (0 to 10.4 cu in).

RJIA4209E

 

 

 

 

 

 

 

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