62A-9
AIR CONDITIONING
Refrigerant circuit: Draining - Filling
AIR CONDITIONING or CLIMATE CONTROL
62A
I - RECOVERING REFRIGERANT FLUID
a
When draining or checking the refrigerant fill load,
three scenarios are to be taken into account:
-the engine is running and the air conditioning is in
operation (A),
-the engine is running but the air conditioning is not
in operation (B),
-the engine is not running nor is the air conditioning
in operation (C).
aScenario A:
-Operate the air conditioning until the cooling fan
assembly is triggered twice,
-Switch off the engine,
-drain for the first time (note down the original val-
ue),
-wait 15 minutes,
-check that the relative pressure is no more than 0
bar,
-repeat the cycles until the relative pressure is equal
to or less than 0 bar,
-add together the values of the various draining op-
erations; the fill is confirmed as being correct if the
volume of refrigerant fluid is the specified fill +35g
or -100g.
Scenario B:
-run the engine until the cooling fan is triggered
twice,
-Switch off the engine,-drain for the first time (note down the value),
-wait 15 minutes,
-run the engine until the cooling fan is triggered
twice,
-Switch off the engine,
-drain for the second time (note down the value),
-repeat the cycles until the relative pressure is equal
to or less than 0 bar,
-add together the values of the various draining op-
erations; the fill is confirmed as being correct if the
volume of refrigerant fluid is the specified fill +35g
or -100g.
Scenario C:
-drain for the first time (note down the value),
-wait 2 hours,
-repeat the cycles until the relative pressure is equal
to or less than 0 bar,
-add together the values of the various draining op-
erations; the fill is confirmed as being correct if the
volume of refrigerant fluid is the specified fill +35g
or -100g.
II - CREATING A VACUUM
aIt is essential to carry out vacuum extraction correct-
ly before loading, otherwise the air conditioning will
not work properly.
There are two scenarios to consider:
-vacuum created immediately after discharge (sce-
nario A),
-vacuum created after an interval of several hours
or days (scenario B).
Scenario A:
-creation of a vacuum takes 20 minutes.
Scenario B:
-creation of a vacuum takes 45 minutes to elimi-
nate any trace of moisture.
aTest the seal once the vacuum has been created
(some stations do this automatically).
III - FILLING
aFill up the refrigerant circuit using the refrigerant
charging station. Note:
-If the air conditioning circuit is fitted with a sin-
gle filler valve, some filling equipment only
requires the use of the high pressure pipe (refer
to the filling station instructions).
-Depending on the situation, run the system for
a few minutes before recovering the coolant to
improve drainage.
Note:
It is essential to follow these procedures to pre-
vent:
- gas escaping when the circuit is opened,
- pollution of the environment through the release
of gas into the atmosphere when the circuit is
opened or when a vacuum is created.
