Sun ECK TWIN 12 Manual De Instrucciones página 82

STATIC DIAGNOSIS
STATIC DIAGNOSIS is a function that permits automatic diagnosis of the causes of
malfunction of vehicle A/C systems through analysis of the behavior of system pressures.
A/C SYSTEM TYPE IDENTIFICATION
Prior to start the diagnosis is necessary to identify the type of A/C system we are working on
expansion valve or orifice tube systems.
• Expansion valve system: a system making use of a thermostatic valve including a block
valve, usually this block valve is partially visible and, is located in the rear part of the
engine compartment (near the passenger compartment) and it is connected with two
hoses (one bigger than the other)
Compressor
INSTRUCTIONS MANUAL
Evaporator
Low pressure
liquid
Metering port
and rod
High
Pressure
gas
Condensor
-81-
Low
Pressure
gas
Metering
diaphragm
Expansion Valve
High pressure
liquid
Receiver/drier