Honda EP3 Service Manual page 823

Heating and Air Gonditioning
System Description (cont'dl
The air conditioning system removes heat from the passenger compartment by circulating refrigerant through the
system as shown below.
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BLOWER FAN
\ \
\ r
\,u
EXPANSION VALVE
(Meters the required
amount of refrigerant
into the evaporator)
A/C PRESSURE SWITCH
When the refriqerant is below
196 kPa (2.0 kgi/cm',28 psi)
or above 3,140 kPa (32 kgf/cm'
455 psi), the Py'c pressure
switch opens the circuit to
the Py'C switch and stops the
air conditioning to protect the
compressor-
RECEIVER/DRYER
(Traps debris, and
removes morsturel
APOBATOR TEMPERATURE
SENSOR
THERMAL PROTECTOR
(Opens the compressor clutch circuit
when the compressot temperature
becomes too high)
RELIEF VALVE
(Relieves pressure at the compressor
w h e n t h e p r e s s u r e i s t o o h i g h )
A/C COMPRESSOR
(Suction and comoression)
\-^
I
HrcH PRESSURE
vAPoR
[ '....
-:--l
Low PREsSUBE LrourD
tffi
Low PREssURE vAPoR
This vehicle uses HFC-134a (R-'134a) refrigerant which does not contain ch lorofluorocarbons. Pay attention to the
following service items:
. D o n o t m i x r e f r i g e r a n t s C F C - 1 2 ( R - 1 2 ) a n d H F C - 1 3 4 a ( R - 1 3 4 a ) . T h e y a r e n o t c o m p a t i b l e .
. U s e o n l y t h e r e c o m m e n d e d p o l y a l k y l e n e g l y c o l
( P A G ) r e f r i g e r a n t o i l ( K E l H l N S P ' ! 0 ) d e s i g n e d f o r t h e R - 1 3 4 a
compressor. Intermixing the recommended (PAG) refrigerant oil with any other retrigerant oil will result in
compressor failu re.
. AllAy'C system parts (compressor, discharge line, suction line, evaporator, condenser, receiver/dryer. expansion
valve, O-rings for joints) have to be designed for refrigerant R 134a. Do not exchange with R-'12 parts.
. Use a halogen gas leak detector designed for refrigerant R-134a.
. R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging
s t a t i o n t h a t i s U . L . - l i s t e d a n d i s c e r t i f i e d t o m e e t t h e r e q u i r e m e n t s o f S A E J 2 2 1 0 t o s e r v i c e R - 1 3 4 a a i r c o n d i t i o n i n g
system.
. Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting
any Ay'C fifting.
/ -
CONDENSER
(Radiation of heat)
21-12