Nissan March K13. Manual — part 358
PREPARATION
HA-11
< PREPARATION >
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Sealant or/and Lubricant
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HFC-134a (R-134a) Service Tool and Equipment
• Never mix HFC-134a (R-134a) refrigerant and/or its specified lubricant with CFC-12 (R-12) refrigerant and/
or its lubricant.
• 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.
• Never use adapters that convert one size fitting to another: refrigerant/lubricant contamination occurs and
compressor malfunction may result.
Manifold gauge set (with hos-
es and couplers)
Identification:
• The gauge face indicates HFC-134a (R-
134a).
Fitting size: Thread size
• 1/2
″
-16 ACME
Service hoses
• High-pressure side hose
• Low-pressure side hose
• Utility hose
Hose color:
• Low-pressure side hose: Blue with black
stripe
• High-pressure 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-pressure side coupler
• Low-pressure side coupler
Hose fitting to service hose:
M14 x 1.5 fitting is optional or permanently
attached.
Refrigerant weight scale
For measuring of refrigerant
Fitting size: Thread size
1/2
″
-16 ACME
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 name
Description
RJIA0196E
S-NT201
S-NT202
S-NT200
S-NT203
HA-12
< PREPARATION >
PREPARATION
Tool name
Description
HFC-134a (R-134a) refrigerant
Container color: Light blue
Container marking: HFC-134a (R-
134a)
Fitting size: Thread size
• Large container 1/2
″
-16 ACME
UV Luminous Oil Type S (DH-PS)
Type: Polyalkylene glycol oil (PAG),
type S (DH-PS)
Application:
HFC-134a (R-134a) swash plate com-
pressors
Capacity: 40 m
(1.4 Imp fl oz.)
S-NT196
S-NT197
COMPONENT PARTS
HA-13
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
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Component Description
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JMIIA0653ZZ
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
EC-29, "Refrigerant Pressure Sensor"
(for thailand) or
EC-333, "Refrigerant Pressure Sen-
(except for thailand).
Liquid tank
Eliminates foreign matter in refrigerant, and stores temporarily liquid refrigerant.
Expansion valve
Transforms high-pressure liquid refrigerant to mist form low-pressure liquid refrigerant by drawing
function.
HA-14
< SYSTEM DESCRIPTION >
SYSTEM
SYSTEM
System Diagram
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System Description
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REFRIGERANT CYCLE
Refrigerant Flow
The refrigerant from the compressor, flows the condenser with liquid tank, the evaporator, and returns to the
compressor. The refrigerant evaporation in the evaporator is controlled by an expansion valve.
Freeze Protection
Automatic air conditioner
• When intake sensor detects that evaporator surface temperature is 2
°
C (36
°
F) or less, A/C auto amp.
requests BCM to turn the compressor OFF.
• BCM requests ECM to turn the compressor to OFF by the signal from A/C auto amp., and ECM makes A/C
relay to OFF, and stops the compressor.
Manual air conditioner
• When thermo control amp. detects that evaporator surface temperature becomes 2
°
C (36
°
F) or less, BCM
requests ECM to turn the compressor OFF, and stops the compressor.
REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor
• The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure
sensor, installed at the condenser exit. The refrigerant pressure sensor detects the pressure inside the
refrigerant line and sends the voltage signal to the ECM if the system pressure rises above, or falls below
the specifications.
• ECM turns the A/C relay to OFF and stops the compressor when the high-pressure side detected by refriger-
ant pressure sensor is following conditions;
- Approximately 3,120 kPa (31.2 bar, 31.8 kg/cm
2
, 452 psi) or more (Engine speed is less than 1,500 rpm.)
- Approximately 2,740 kPa (27.4 bar, 27.9 kg/cm
2
, 397 psi) or more (Engine speed is 1,500 rpm or more.)
- Approximately 120 kPa (1.2 bar, 1.2 kg/cm
2
, 17 psi) or less
JPIIA1671GB
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