Refrigerant Charge - Tecumseh SH4576Z Instructions D'utilisation

Some refrigerant fluids, such as R134a, have a very high miscibility with POE oil , even at ambient
temperature. In a case where the oil and refrigerant are mixed, even a prolonged vacuum drawing will not
separate them.
Never supply power to a compressor under a vacuum. A vacuum is an excellent conductor and can
cause a corona effect (flash cluster) and immediately void the warranty.
6.2 – Refrigerant charge
Switch off the solenoid valves. Withdraw the vacuum pump. Connect the pressure switch to the LP side
and on the HP side between the condenser and the regulator. Never connect a pressure switch directly to
the discharge. Load the refrigerant liquid directly into the liquid line, possibly into the reservoir. If the
evaporator is submersible, liquid can be transferred to it also.
Never load the liquid refrigerant into the suction line. If that happens, recover all the refrigerant
fluid using a suitable recovery machine. If the refrigerant is zeotropic, it can not be used any more and
must be treated as industrial waste.
When the refrigerant liquid in the liquid state stops flowing in the liquid line, close the valves on the
manifold and complete loading in the vapour phase, in order to break the vacuum in the LP circuit. The
crankcase heater should remain switched on throughout the loading. Check that the oil has not changed
colour, density or appearance and that a foam has not formed. If it has, it means that the fluid has become
mixed with oil. Repeat the operation.
At this stage, the charge of refrigerant fluid in the circuit is sufficient to start the compressor.
6.3 – Completing commissioning
Start the installation. Charge the circuit until you reach the desired charge by ensuring that you keep the
discharge temperature approximately 30 K above the condensation temperature.
The charge should be considered complete when the super-cooling level desired is reached.
Keep the level of oil under control. If the oil level falls below the minimum, it must be topped up.
In that case, close the solenoid valve and store the refrigerant fluid in the HP part. As soon as a sufficient
level of vacuum is reached, stop the compressor and close the service valves. Pour oil through the orifice
provided on the compressor. After filling, close the oil orifice and create a vacuum with the compressor
before re-opening the service valves. Do not add refrigerant to the rest of the circuit except to the oil
separators.
If necessary, go through the filling process several times. Check that the oil is circulating correctly and flows
back to the compressor.
Attention: Adding too much oil can be dangerous. Excess oil can seriously damage the
compressor's machinery.
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