Infiniti G20 (P11). Manual — part 420
HFC-134a (R-134a) Service Tools and
Equipment
=NCHA0009
Never mix HFC-134a refrigerant and/or its specified lubricant with CFC-12 (R-12) refrigerant and/or its lubri-
cant.
Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/
lubricant.
Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles
refrigerant and/or lubricant) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid
mixed use of the refrigerants/lubricant.
Adapters that convert one size fitting to another must never be used: refrigerant/lubricant contamination will
occur and compressor failure will result.
Tool number
(Kent-Moore No.)
Tool name
Description
HFC-134a (R-134a)
refrigerant
NT196
Container color: Light blue
Container marking: HFC-134a (R-134a)
Fitting size: Thread size
I
Large container 1/2
″
-16 ACME
KLH00-PAGR0
(
—
)
Nissan A/C System Oil
Type R
NT197
Type: Poly alkylene glycol oil (PAG), type R
Application: HFC-134a (R-134a) vane rotary com-
pressors (Nissan only)
Lubricity: 40 m
(1.4 US fl oz, 1.4 Imp fl oz)
(J-39500-INF)
Recovery/Recycling
Recharging equipment
(ACR4)
NT195
Function: Refrigerant Recovery and Recycling and
Recharging
(J-41995)
Electrical leak detector
AHA281A
Power supply:
I
DC 12V (Cigarette lighter)
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
PREPARATION
AUTO
HFC-134a (R-134a) Service Tools and Equipment
HA-11
Tool number
(Kent-Moore No.)
Tool name
Description
(J-43926)
Refrigerant dye leak
detection kit
Kit includes:
(J-42220) UV lamp and
UV safety glasses
(J-41459) Refrigerant
dye injector
(J-41447) qty. 24
R-134a refrigerant dye
(J-43872) Refrigerant
dye cleaner
SHA437F
Power supply:
DC 12V (Battery terminal)
(J-42220)
Fluorescent dye leak
detector
UV lamp
UV safety glasses
SHA438F
Power supply: DC12V (Battery terminal)
For checking refrigerant leak when fluorescent dye
is installed in A/C system.
Includes: UV lamp and UV safety glasses
(J-41447)
R134a Fluorescent Leak
Detection Dye (Box of
24, 1/4 ounce bottles)
Dye
SHA439F
Application: For R-134a PAG oil
Container: 1/4 ounce (7.4 cc) bottle
(Includes self-adhesive dye identification labels for
affixing to vehicle after charging system with dye.)
(J-41459)
R134a Dye Injector
Use with J-41447, 1/4
ounce bottle
Dye injector
SHA440F
For injecting 1/4 ounce of Fluorescent Leak Detec-
tion Dye into A/C system.
(J-43872)
Dye cleaner
SHA441F
For cleaning dye spills.
(J-39183)
Manifold gauge set (with
hoses and couplers)
NT199
Identification:
I
The gauge face indicates R-134a.
Fitting size: Thread size
I
1/2
″
-16 ACME
PREPARATION
AUTO
HFC-134a (R-134a) Service Tools and Equipment (Cont’d)
HA-12
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:
I
Low hose: Blue with black stripe
I
High hose: Red with black stripe
I
Utility hose: Yellow with black stripe or green
with black stripe
Hose fitting to gauge:
I
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
NCHA0009S01
Tool name
Description
Refrigerant identifier
equipment
NT765
For checks refrigerant purity and for system con-
tamination
GI
MA
EM
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
SC
EL
IDX
PREPARATION
AUTO
HFC-134a (R-134a) Service Tools and Equipment (Cont’d)
HA-13
Refrigeration System
REFRIGERATION CYCLE
NCHA0010
Refrigerant Flow
NCHA0010S01
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
NCHA0010S02
The compressor cycles go on and off to maintain the evaporator temperature within a specified range. When
the evaporator coil temperature falls below a specified point, the thermo control amplifier interrupts the com-
pressor operation. When the evaporator coil temperature rises above the specification, the thermo control
amplifier allows compressor operation.
Refrigerant System Protection
NCHA0010S03
Refrigerant Pressure Sensor
NCHA0010S0303
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure
sensor, located on the liquid tank. 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
NCHA0010S0302
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 abnormal 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.
RHA347H
DESCRIPTION
AUTO
Refrigeration System
HA-14
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