Infiniti I35 (A33). Manual — part 525
Tool number
(Kent-Moore No.)
Tool name
Description
Service hoses
I
High side hose
(J-39501-72)
I
Low side hose
(J-39502-72)
I
Utility hose
(J-39476-72)
NT201
Hose color:
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Low hose: Blue with black stripe
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High hose: Red with black stripe
I
Utility hose: Yellow with black stripe or green
with black stripe
Hose fitting to gauge:
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1/2
″
-16 ACME
Service couplers
I
High side coupler
(J-39500-20)
I
Low side coupler
(J-39500-24)
NT202
Hose fitting to service hose:
I
M14 x 1.5 fitting is optional or permanently
attached.
(J-39650)
Refrigerant weight
scale
NT200
For measuring of refrigerant
Fitting size: Thread size
I
1/2
″
-16 ACME
(J-39649)
Vacuum pump
(Including the isolator
valve)
NT203
Capacity:
I
Air displacement: 4 CFM
I
Micron rating: 20 microns
I
Oil capacity: 482 g (17 oz)
Fitting size: Thread size
I
1/2
″
-16 ACME
COMMERCIAL SERVICE TOOL
NHHA0161S01
Tool name
Description
Refrigerant identifier
equipment
NT765
For checking refrigerant purity and for system con-
tamination
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PREPARATION
HFC-134a (R-134a) Service Tools and Equipment (Cont’d)
HA-13
Refrigeration System
REFRIGERATION CYCLE
NHHA0162
Refrigerant Flow
NHHA0162S01
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, the 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
NHHA0162S02
Under normal 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
NHHA0162S03
Refrigerant Pressure Sensor
NHHA0162S0301
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure
sensor, located in the rear head of the compressor. 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 177 kPa (1.8 kg/cm
2
, 26 psi).
Pressure Relief Valve
NHHA0162S0302
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compres-
sor. 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.
RHA031I
DESCRIPTION
Refrigeration System
HA-14
V-6 Variable Displacement Compressor
GENERAL INFORMATION
=NHHA0163
1. The V-6 variable compressor differs from previous units. The vent temperatures of the V-6 variable com-
press do not drop too far below 5°C (41°F) when:
I
evaporator intake air temperature is less than 20°C (68°F)
I
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 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.
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 (1.5 to 1.8 kg/cm
2
, 21 to 26 psi) under varying conditions.
In previous compressors, however, suction pressure was reduced with increases in engine speed.
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DESCRIPTION
V-6 Variable Displacement Compressor
HA-15
DESCRIPTION
=NHHA0164
General
NHHA0164S01
The variable compressor is basically 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 can be continu-
ously changed from 14.5 to 184 cm
3
(0.885 to 11.228 cu in).
RHA037DD
DESCRIPTION
V-6 Variable Displacement Compressor (Cont’d)
HA-16
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