Honda 2004 Odyssey Service Manual page 1543

Heating/Air Conditioning
System Description (cont'd)
A/C Pressure Switch
The A/C pressure switch consists of a high-low pressure switch (A/C pressure switch A) and a middle pressure switch
(A/C pressure switch B).
• High-Low pressure switch
If the refrigerant pressure becomes too high (due to blockage or lack of airflow at the condenser), or too low (due to
leakage), the A/C pressure switch stops the A/C request a signal to the PCM and the compressor stops operating.
ON
OFF
• Middle pressure switch
If the refrigerant pressure goes above or below 1,520 kPa (15.5 kgf/cm , 220 psi), the A/C pressure switch opens or
closes to signal the PCM to change the speed of the condenser fan and radiator fan (high-low).
21-12
20 kPa
2
(0.2 kgf/cm , 2.8 psi)
225 kPa
2
(2.3 kgf/cm , 33 psi)
196 kPa
2
(2.0 kgf/cm , 28 psi)
290 kPa (3.0 kgf/cm , 43 psi)
ON
OFF
2,550 kPa
2
(26.0 kgf/cm , 370 psi)
2
2
1,520 kPa
2
(15.5 kgf/cm , 220 psi)
1,230 kPa
2
(12.5 kgf/cm , 178 psi)
HIGH-LOW
PRESSURE
SWITCH
MIDDLE
PRESSURE
SWITCH
590 kPa
2
(6.0 kgf/cm , 85 psi)
3,140 kPa
2
(32.0 kgf/cm , 455 psi)