Honda Acura NSX 1991 Service Manual page 895

Construction
The tripple pressure switch consists of pressure switch A (Hi-Low pressure switch) and pressure switch B (middle pres-
sure switch).
If the refrigerant pressure becomes too high (due to blockage) or too low (due to leakagae),
sends a signal to the cooling fan control unit to prevent the compressor from operating.
25kPA
231kPA
Middle pressure switch
l
If the refrigerant pressure goes above or below 1520 kpa (15.5kg-cm
a signal to the PGM-FI ECU, then the PGM-FI ECU operates the idle control.
PRESSURE
SWITCH
588kPA
2059kPA
299 psi)
.
294kPA (3kg-cm2. 42psi)
1226kPA
the tripple pressure switch
Operate the compressor
Stop the compressor
H i - L o w
PRESSURE
SWITCH
Middle
PRESSURE
SWITCH