Nissan Titan. Manual — part 366
REFRIGERATION SYSTEM
HA-15
< 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, 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
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1.
Pressure relief valve
2.
Compressor
3.
Condenser assembly
4.
Refrigerant pressure sensor
5.
Air mix door
6.
Blower motor
7.
Evaporator
8.
Expansion valve
9.
Liquid Tank
A.
High-pressure gas
B.
High-pressure liquid
C.
Low-pressure liquid
AWIIA1610ZZ
HA-16
< SYSTEM DESCRIPTION >
REFRIGERATION SYSTEM
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.
D.
Low-pressure gas
E.
Outside air
F.
Recirculation air
G.
Ventilation discharge
REFRIGERATION SYSTEM
HA-17
< SYSTEM DESCRIPTION >
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Component
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A/C COMPRESSOR AND CONDENSER
AWIIA1609ZZ
1.
Expansion valve
2.
High-pressure pipe
3.
High-pressure service valve
4.
Condenser seal (RH)
5.
Side seal (RH)
6.
Liquid tank bracket
7.
Junction pipe
8.
Liquid tank
9.
Refrigerant pressure sensor
10.
Grommet
11.
Grommet
12. Side seal (LH)
13.
Condenser assembly
14.
Condenser seal (LH)
15. Compressor
HA-18
< SYSTEM DESCRIPTION >
REFRIGERATION SYSTEM
NOTE:
HA-5, "Precaution for Refrigerant Connection"
16.
Low-pressure flexible hose
17.
High-pressure flexible hose
18. Low-pressure service valve
19.
Low-pressure pipe
20.
Drain hose
Front
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