Drying And Vacuum Of The Plant; Cleaning The Circuit; Refrigerant Charge; Verification Of Overheating - A2B Accorroni HUB RADIATOR MINI 6.0 Technical Information

- circuit cleaning;
- drying and high vacuum;
- test of tightness and restoration of the charge.

12.2 DRYING AND VACUUM OF THE PLANT

Drying and high vacuum are necessary
to evacuate the air, humidity, and all the gases
that could be in solution with the oil of the
compressor.
If there is liquid water in the system,
it is necessary to slightly heat the parts in which
one is filed, in order to favour evaporation
The capacity of the high vacuum pump must
be appropriate to the system in which it must be
operate; the use of a pump is recommended
with a flow rate of at least 90 liters / minute.
The degree of vacuum must be verified with
special vacuum gauge for medium vacuum,
possibly electronic, with resolution in
micron of the scale.
- Carrying out a heavy vacuum:
- connect the pump to the system using pipes,
swivel 1/4 SAE female connections,
at the pressure ports shown on
inlet and outlet connections in
compressor;
- connect a vacuum gauge
- make the vacuum up to the value of at least
350, 500 microns for a minimum time of
at least 30 minutes.
12.3 CLEANING OF THE CIRCUIT
WARNING! In the case of engine burning,
with perforation of the windings, it is necessary
clean the cooling circuit thoroughly for
avoid subsequent burns or breakdowns.
The cleaning operations are aimed at
eliminate all carbon deposits or others
solid state and, according to the method used,
must all the contaminants that have been
eliminated introduced for circuit cleaning or
effect of the operations carried out.
WARNING! Do not inhale refrigerant vapours
coming from burned compressors, as yes
may be in the presence of toxic products. To
avoid contacts with the skin of the residual oil of
the burned compressor.

12.4 REFRIGERANT CHARGE

WARNING! The refrigerant gas in the state
liquid should not be charged to the suction line
on the compressor as this condition it damages
the compressor.
The operations to be performed are the
following:
- connect the cylinder (or charging cylinder) to
the SAE 1/4 pipe system and connections
swivel female at the pressure point in the
liquid side of the air / gas exchangers
refrigerant;
- insert refrigerant in the liquid state:
a) until the required charge is reached
b) until the balance is achieved
pressures between cylinder and refrigerant
circuit;
- start the appliance and, if necessary,
insert the remaining refrigerant until
achievement of the prescribed values.
The charge adjustment operation
it must be done using the suction socket
of the compressor, by inserting the refrigerant
in the liquid state gradually;
- check the refrigerant charge.
WARNING! Make sure the tools used are in
good condition and properly calibrated.

12.5 VERIFICATION OF OVERHEATING

- start the appliance;
- insert into the pressure outlet, positioned
in the large tube near the compressor,
the low pressure gauge for the measurement of
the pressure;
- wait for the values to stabilize for about 20
minutes;
- measure the temperature value on the pipe
large (steam phase), near the
pressure connection using a special one
contact probe;
- read the temperature value in the
pressure gauge, at the value of
pressure detected.
The temperature read by the thermometer must
be greater than the temperature read on the
pressure gauge of a value between 3 ° C and 8
° C for the operation in cooling mode, between
1 ° C and 5 ° C for operation in heating mode.
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