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The R32 refrigerant gas filling inside the circuit must be carried
out according to the system discharge and suction pressure.
Before carrying out any charging operation, perform a tightness
test of the refrigerant pipes; if necessary, replace or repair the
damaged part before working on the unit.
The charging procedure is possible in two cases: to completely
charge the empty system or to add refrigerant. In both cases,
follow the steps below.
PROCEDURE FOR REFRIGERANT CHARGING COMPRESSOR REPLACEMENT OR REMOVAL
Should it be necessary to remove or replace the compressor, it is
mandatory to follow the instructions below:
• Turn off the power to the unit.
• Recover the refrigerant slowly to prevent the oil from
escaping.
• Remove the power line and the temperature sensor.
• Desolder the soldering points of the intake and exhaust lines.
• Remove the compressor retainers and check the quality of the
oil and the compressor itself.
• Remove the compressor.
• Clean the piping.
ATTENTION
The entire circuit must be completely vacuumed and
dried before proceeding with charging.
Full system charge
Before starting it is necessary to perform a leak test of the pipes
by loading nitrogen into the system at high pressure (15 ~ 20
kg).
Should any welding work be necessary on the system, it is
mandatory, first of all, to completely empty the gas circuit.
ATTENTION
When performing gas tightness and air tightness tests,
never charge oxygen, acetylene or other flammable and
toxic gases but only high pressure air, nitrogen or refrig
-
erant compatible with the system.
The mineral deposits that can deposit on the surface of
the unit have effects on the efficiency of the unit: they
will increase the water resistance and lower the refrigera
-
tion capacity. Therefore, it is necessary to remove the
encrustations with dilute acid.
(Note that the water content and, consequently, the wa-
ter quality may vary. They must therefore be treated with
different types of acid according to the characteristics).
With the system clean and intact, ready for the complete charge,
proceed as follows:
1. Connect the pressure gauge to the manifold.
2. Vacuum the system with the vacuum pump.
3. After the pressure inside the system reaches the required
value (<80 Pa) and is kept below 100 Pa for more than 30
minutes, charge the refrigerant on the low pressure side
according to the rating specifications on the nameplate.
4. The refrigerant charge will be affected by the ambient
temperature.
When the refrigerant inside the circuit is less than the required
quantity, it must be added. To do this, follow the procedure
below.
Addition
Connect the refrigerant charge port on the low pressure side of
the refrigerant tank and install a pressure gauge in the manifold.
5. Let the chilled water flow and start the unit.
6. Slowly charge the R32 refrigerant gas into the system and
check the suction and discharge pressure at the same time.
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