Nissan Versa Sedan. Instruction — part 478
PREPARATION
HA-11
< PREPARATION >
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(Tool number)
Tool name
Description
(J-41810-NI)
Refrigerant identifier equipment (R-
134a)
Checking refrigerant purity and system
contamination
( — )
Power tool
Loosening nuts, screws and bolts
RJIA0197E
PIIB1407E
HA-12
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000009269731
Component Description
INFOID:0000000009269732
JMIIA1728ZZ
1.
Condenser
2.
Compressor
3.
Refrigerant pressure sensor
4.
Liquid tank
5.
Evaporator
6.
Expansion valve
A.
Built-in heater & cooling unit assem-
bly
Component
Description
Evaporator
The mist form liquid refrigerant transforms to gas by evaporation by the air conveyed from blower
motor. The air is cooled by the heat by evaporation.
Condenser
Cools refrigerant discharged from compressor, and transforms it to liquid refrigerant.
Compressor
Intakes, compresses, and discharges refrigerant, to circulate refrigerant inside the refrigerant cycle.
Refrigerant pressure sensor
Refer to
HA-38, "Removal and Installation"
.
Liquid tank
Eliminates foreign matter in refrigerant, and temporarily stores liquid refrigerant.
Expansion valve
Transforms high-pressure liquid refrigerant to mist form low-pressure liquid refrigerant by drawing
function.
REFRIGERATION SYSTEM
HA-13
< SYSTEM DESCRIPTION >
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REFRIGERATION SYSTEM
Refrigerant Cycle
INFOID:0000000009269733
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coils
are controlled by externally equalized expansion valve, located inside the evaporator case.
Refrigerant System Protection
INFOID:0000000009269734
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.
AWIIA1504ZZ
1.
A/C compressor
2.
Pressure relief valve
3.
Liquid tank
4.
Refrigerant pressure sensor
5.
Condenser
6.
Expansion valve
7.
Evaporator
8.
Blower motor
A.
High-pressure gas
B.
High-pressure liquid
C.
Low-pressure liquid
D.
Low-pressure gas
E.
Suction port
F.
Discharge port
G
Outside air
HA-14
< SYSTEM DESCRIPTION >
REFRIGERATION SYSTEM
Component
INFOID:0000000009269735
NOTE:
HA-4, "Precaution for Refrigerant Connection"
1.
A/C unit assembly
2.
O-ring
3.
High-pressure pipe
4.
Condenser
5.
Liquid tank
6.
Refrigerant pressure sensor
7.
High-pressure flexible hose
8.
Compressor
9.
Low-pressure flexible hose
AWIIA1611ZZ
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