Nissan Terrano r20e. Manual — part 341
Air Flow
NHA332
DESCRIPTION — Overall System
HA-8
Refrigeration Cycle
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser, the liquid tank,
through the 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
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 compres-
sor operation. When the evaporator coil temperature rises above the specification, the thermo control ampli-
fier allows compressor operation.
REFRIGERANT SYSTEM PROTECTION
Dual-pressure switch
The refrigerant system is protected against excessively high or low pressures by the dual-pressure switch,
located on the liquid tank. If the system pressure rises above, or falls below the specifications, the dual-pres-
sure switch opens to interrupt the compressor operation.
RHA193E
DESCRIPTION — Refrigeration System
HA-9
Special Service Tools
Tool number
Tool name
Description
KV99231260
Clutch disc wrench
Removing shaft nut and clutch disc
KV99232340
Clutch disc puller
Removing clutch disc
KV99234330
Pulley installer
Installing pulley
KV99233130
Pulley puller
Removing pulley
PREPARATION
HA-10
HFC-134a (R-134a) Service Tools and
Equipment
It is important to understand that HFC-134a (R-134a) refrigerant, and the specified lubricant which must be
used with HFC-134a (R-134a), must never be mixed with CFC-12 (R-12) refrigerant and/or the CFC-12 (R-12)
lubricant.
This means that separate and non-interchangeable service equipment must be used for handling each type
of refrigerant/lubricant.
To prevent the mixing of refrigerants/lubricants, 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).
Adaptors to convert from one size of fitting to another must never be used: refrigerant/lubricant contamination
will occur and compressor failure will result.
Tool number
(Kent-Moore No.)
Tool name
Description
Note
HFC-134a (R-134a)
refrigerant
Container color: Light blue
Container marking: HFC-134a (R-134a)
Fitting size: Thread size
I
large container 1/2
″
-16 ACME
KLH00-PAGR0
(
—
)
Nissan A/C System Oil
Type R
Type: Poly alkyline glycol oil (PAG), type R
Application: HFC-134a (R-134a) vane rotary
compressors (Nissan only)
Lubricity: 40 m
(1.4 Imp fl oz)
(J-39500-NI) (115V)
(J-39635) (220V)
Recovery/Recycling/
Recharging
equipment (ACR4)
Function: Refrigerant Recovery and
Recycling and Recharging
(J-39400)
Electrical leak detector
Power supply:
I
DC 12V (Cigarette lighter)
PREPARATION
HA-11
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