Infiniti M35/M45 Y50. Manual — part 117
PREPARATION
ATC-19
C
D
E
F
G
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K
L
M
A
B
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
C
D
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A
B
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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