Nissan Frontier. Manual — part 855
HA-12
< PREPARATION >
PREPARATION
Commercial Service Tool
INFOID:0000000009478577
Service hoses:
• High side hose
(J-39500-72B)
• Low side hose
(J-39500-72R)
• Utility hose
(J-39500-72Y)
Hose color:
• Low side hose: Blue with black stripe
• High side 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 side coupler
(J-39500-20A)
• Low side coupler
(J-39500-24A)
Hose fitting to service hose:
• M14 x 1.5 fitting is optional or perma-
nently attached.
—
(J-39699)
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
(TechMate No.)
Tool name
Description
S-NT201
S-NT202
S-NT200
S-NT203
(TechMate No.)
Tool name
Description
(J-41810-NI)
Refrigerant identifier equipment (R-
134a)
For checking refrigerant purity and sys-
tem contamination
Power tool
Loosening nuts, screws and bolts
RJIA0197E
PIIB1407E
REFRIGERATION SYSTEM
HA-13
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
REFRIGERATION SYSTEM
Refrigerant Cycle
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REFRIGERANT FLOW
The refrigerant flows in the standard pattern. Refrigerant flows through the compressor, condenser, liquid tank,
expansion valve, 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
The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the
evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor opera-
tion. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor
operation.
Refrigerant System Protection
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REFRIGERANT PRESSURE SENSOR
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the condenser. 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 a voltage signal to the ECM.
The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch 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 120 kPa (1.22 kg/cm
2
, 17.4 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 abnormal level [more than 2,990 kPa (30.5 kg/
cm
2
, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
WJIA1482E
HA-14
< PERIODIC MAINTENANCE >
REFRIGERATION SYSTEM
PERIODIC MAINTENANCE
REFRIGERATION SYSTEM
HFC-134a (R-134a) Service Procedure
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SETTING OF SERVICE TOOLS AND EQUIPMENT
Discharging Refrigerant
WARNING:
Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.
Remove HFC-134a (R-134a) refrigerant from the A/C system using certified service equipment meeting
requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or SAE J2201 HFC-134a (R-134a)
recovery equipment. If an accidental system discharge occurs, ventilate the work area before resum-
ing service. Additional health and safety information may be obtained from the refrigerant and oil man-
ufacturers.
Evacuating System and Charging Refrigerant
1.
Shut-off valve
2.
A/C service valve
3.
Recovery/Recycling equipment
WJIA1160E
WJIA1161E
REFRIGERATION SYSTEM
HA-15
< PERIODIC MAINTENANCE >
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1.
Shut-off valve
2.
A/C service valve
3.
Recovery/Recycling equipment
4.
Refrigerant container (HFC-134a)
5.
Refrigerant weight scale
6.
Vacuum pump
7.
Manifold gauge set with hoses and
couplers
HA-14, "HFC-134a (R-134a) Service
*3
HA-18, "Checking of Refrigerant
Leaks"
*5
HA-3, "Contaminated Refrigerant"
*2
HA-18, "Checking of Refrigerant
Leaks"
*4
WJIA1923E
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