Nissan Versa Note. Manual - part 495
SYSTEM
HAC-15
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
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HAC
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CONTROL BY THERMO CONTROL AMP.
Low Temperature Protection Control
• When thermo control amp. detects that evaporator fin temperature
is 1.5
°C (35°F) or less, thermo control amp. switches A/C ON sig-
nal to OFF and stops the compressor.
When the evaporator fin temperature returns to 3
°C (37°F) or
more, the compressor is activated.
CONTROL BY ECM
Refrigerant Pressure Protection
The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the liquid tank on the condenser. The refrigerant pressure sensor detects the pressure inside
the refrigerant line and sends a voltage signal to the ECM. If the system pressure rises above or falls below
the following values, the ECM requests the IPDM E/R to de-energize the A/C relay and disengage the com-
pressor.
• 3.12 MPa (31.82 kg/cm
2
, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm
2
, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm
2
, 20.3 psi) or less
Compressor Oil Circulation Control
When the engine starts while the engine coolant temperature is 56
°C (133°F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor oil once.
Air Conditioning Cut Control
When the engine is under a high load condition, the ECM transmits an A/C relay OFF request to IPDM E/R,
and stops the compressor. Refer to
EC-37, "AIR CONDITIONING CUT CONTROL : System Description"
Door Control
INFOID:0000000009549325
SWITCHES AND THEIR CONTROL FUNCTIONS
JMIIA1228GB