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

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Outside air

HA-14

< SYSTEM DESCRIPTION >

REFRIGERATION SYSTEM

Component

INFOID:0000000009269735

NOTE:

Refer to 

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