Nissan Primera P11. Manual — part 464
Tool name
Description
Note
Electrical leak detector
NT198
Power supply:
●
DC 12 V (Cigarette lighter)
Manifold gauge set (with
hoses and couplers)
NT199
Identification:
●
The gauge face indicates R-134a.
Fitting size: Thread size
●
1/2”-16 ACME
Service hoses
●
High side hose
●
Low side hose
●
Utility hose
NT201
Hose color:
●
Low hose: Blue with black stripe
●
High 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
●
Low side coupler
NT202
Hose fitting to service hose:
●
M14 x 1,5 fitting is optional or perma-
nently attached.
Refrigerant weight scale
NT200
For measuring of refrigerant
Fitting size: Thread size
●
1/2”-16 ACME
Vacuum pump
(Including the isolator
valve)
NT203
Capacity:
●
Air displacement: 4 CFM
●
Micron rating: 20 microns
●
Oil capacity: 482 g (17 oz)
Fitting size: Thread size
●
1/2”-16 ACME
PRECAUTIONS AND PREPARATION
HFC-134a (R-134a) Service Tools and
Equipment (Cont’d)
HA-9
Precautions for Service Equipment
RECOVERY/RECYCLING/RECHARGING EQUIPMENT
Be certain to follow the manufacturer’s instructions for machine
operation and machine maintenance. Never introduce any refrig-
erant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR
Be certain to follow the manufacturer’s instructions for tester
operation and tester maintenance.
VACUUM PUMP
The lubricant contained inside the vacuum pump is not compat-
ible with the specified lubricant for HFC-134a (R-134a) A/C sys-
tems. The vent side of the vacuum pump is exposed to atmo-
spheric pressure, so the vacuum pump lubricant may migrate out
of the pump into the service hose. This is possible when the
pump is switched off after evacuation (vacuuming) and hose is
connected to it.
To prevent this migration, use a manual valve placed near the
hose-to-pump connection, as follows:
●
Usually vacuum pumps have a manual isolator valve as part
of the pump. Close this valve to isolate the service hose from
the pump.
●
For pumps without an isolator, use a hose equipped with a
manual shut-off valve near the pump end. Close the valve to
isolate the hose from the pump.
●
If the hose has an automatic shut off valve, disconnect the
hose from the pump. As long as the hose is connected, the
valve is open and lubricating oil may migrate.
Some one-way valves open when vacuum is applied and close
under a no vacuum condition. Such valves may restrict the
pump’s ability to pull a deep vacuum and are not recommended.
MANIFOLD GAUGE SET
Be certain that the gauge face indicates R-134a or 134a. Be sure
the gauge set has 1/2”-16 ACME threaded connections for ser-
vice hoses. Confirm the set has been used only with refrigerant
HFC-134a (R-134a) and specified lubricants.
SERVICE HOSES
Be certain that the service hoses display the markings described
(colored hose with black stripe). All hoses must include positive
shut off devices (either manual or automatic) near the end of the
hoses opposite the manifold gauge.
RHA270D
With isolator valve
Hose fittings:
1/2”-16ACME
Close
Shut off valve
Isolator valve
Open
Without isolator valve
SHA533D
1/2
′′
-16ACME
RHA272D
Hose fittings to
manifold gauge orrecovery/recycling
equipment; 1/2”-16ACME
Black stripe
M14
×
1.5 fitting optional
(Hose may be permanentlyattached to
coupler)
PRECAUTIONS AND PREPARATION
HA-10
SERVICE COUPLERS
Never attempt to connect HFC-134a (R-134a) service couplers
to an CFC-12 (R-12) A/C system. The HFC-134a (R-134a) cou-
plers will not properly connect to the CFC-12 (R-12) system.
However, if an improper connection is attempted, discharging
and contamination may occur.
Shut off valve rotation
A/C service valve
Clockwise
Open
Counterclockwise
Close
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC-134a (R-134a) and
specified lubricants have been used with the scale. If the scale
controls refrigerant flow electronically, the hose fitting must be
1/2
″
-16 ACME.
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may
be vented into air from cylinder’s top valve when filling the cylin-
der with refrigerant. Also, the accuracy of the cylinder is gener-
ally less than that of an electronic scale or of quality recycle/
recharge equipment.
RHA273D
M14
×
1.5 fitting
optional
(Hose may be per-
manentlyattached to
coupler)
A/C service
valve
Shut-off
valve
RHA274D
Refrigerant container
(HFC-134a)
Hose fittings:
1/2
′′
-16ACME
To manifold gauge
Weight scale
PRECAUTIONS AND PREPARATION
Precautions for Service Equipment (Cont’d)
HA-11
Refrigeration Cycle
REFRIGERANT FLOW
The refrigerant flow is in the standard pattern. Refrigerant flows through the compressor, condenser, liquid
tank, 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
Variable displacement (CSV613)
Under normal operating conditions, when the A/C is switched on, the compressor runs continuously, and the
evaporator pressure, therefore temperature, is controlled by the CSV613 variable displacement compressor
to prevent freeze up.
Vane rotary (CR-14)
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 thermo control amplifier interrupts the
compressor operation. When the evaporator coil temperature rises above the specification, the thermo con-
trol amplifier allows compressor operation.
REFRIGERANT SYSTEM PROTECTION
Dual-pressure switch (System with CR-14 compressor)
The refrigerant system is protected against excessively high or low pressure by the dual-pressure switch,
located on the liquid tank. If the system pressure rises above, or falls below the specifications, the dual-
pressure switch opens to interrupt the compressor operation.
Pressure sensor (System with CSV613 compressor)
The pressure sensor is located on the liquid tank. It converts the system pressure into a voltage value witch
is then input into ECM.
If the system pressure rises above, or falls below the specifications, ECM interrupt the compressor opera-
tion.
Fusible plug
Open at temperatures above 105°C (221°F), thereby discharging refrigerant to the atmosphere. If this plug
is melted and opened, check the refrigerant line and replace liquid tank.
Pressure relief valve (CSV613 compressor)
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compres-
sor. When the pressure of refrigerant in the system increases to an abnormal level [more than 3,727 kPa
(38 kg/cm
2
, 540 psi)], the release port on the pressure relief valve automatically opens and releases refrig-
erant into the atmosphere.
DESCRIPTION
HA-12
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