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Top-up / replacement of refrigerant charge
The units are factory-tested with the gas charge necessary for correct operation. The amount of gas inside the circuit is indicated in the serial number
plate. Should the R32 need to be topped-up, drain and evacuate the circuit, eliminating traces of non-condensable gases with any humidity. After mainte-
nance operations on the cooling circuit and before restoring the gas charge, wash the circuit thoroughly. Then top-up the exact amount of new oil and
refrigerant as shown on the serial no. plate. The refrigerant must be tapped from the filling cylinder. Once the topping-up operation is complete, repeat the
unit start-up procedure and monitor its operating conditions for at least 24 hours. In the event that, for special reasons, for example in the event of a refrig-
erant leak, it is preferable to proceed with a simple refilling of refrigerant, a slight deterioration of the performance of the unit should be considered. In all
cases the top-up must be carried out in the low pressure section of the machine before the evaporator, using the pressure sockets; make sure that the
refrigerant is introduced only in the liquid phase.
Restoring compressor oil level
Correct oil level can be checked from the oil sight glasses. With the unit switched off, the oil level in the compressors must partially cover the sight-glass
on the compressor. The level is not always constant as it depends on the ambient temperature and the percentage of refrigerant in the oil. With the unit on
and in nominal conditions the oil level should be clearly visible through the sight-glass and must be flat without any ripples. An additional oil top-up can be
carried out after evacuating the compressors, using the pressure connection on the intake. For the quantity and type of oil, refer to the adhesive plate of
the compressor. To perform the oil replenishing operation, contact the HITECSA service center.
Repairing and replacing components
Always refer to the wiring diagrams enclosed with the appliance when replacing electrically powered components. Always take care to clearly label
each wire before disconnecting, in order to avoid making mistakes later when re-connecting.
When the machine is started up again, always go through the recommended start-up procedure.
After maintenance has been performed on the unit, the liquid-humidity indicator (LUE) must be under control. After at least 12 hours of running, the
cooling circuit of the unit must be perfectly "dry", with the LUE green, Otherwise, the filter needs to be replaced.
Replacing the drier filter
To replace the drier filters, drain and eliminate humidity from the cooling circuit by also draining the refrigerant dissolved in oil. Once the filter has been
replaced, evacuate the circuit again to eliminate any trace of non-condensable gases, which could have entered the system while replacing the filter. It is
advisable to check that there are no gas leaks before restarting the machine for normal working.
Instructions on how to drain the cooling circuit
In order to drain the cooling circuit completely by means of type-approved devices, drain the refrigerant fluid from both the high and low-pressure sides
and in the liquid line. Use the load connections in every section of the circuit. In order to drain the refrigerant fluid completely all the circuit lines must be
drained. The fluid must not be discharged into the atmosphere as it causes pollution. It should be recovered in suitable cylinders and delivered to a com-
pany authorised for the collection.
Eliminating Circuit Humidity
If during machine operation there is evidence of humidity in the cooling circuits, it is essential to drain the circuit completely of refrigerant fluid and elimi-
nate the cause of the problem. To remove all the humidity, the operator must dry out the circuit and place it under vacuum up to 70 Pa. It is then possible
to proceed to top up the refrigerant fluid indicated in the plate located on the unit.
2.11. DISMANTLING THE UNIT
SAFEGUARD THE ENVIRONMENT!
Dispose of the packaging materials in compliance with the national or local legislation in force in your country. Do not leave the pac-
kaging within reach of children.
The unit should only be dismantled by a firm authorised for the disposal of scrap machinery/products. The unit as a whole is composed of materials con-
sidered as secondary raw materials and the following conditions must be observed:
the compressor oil must be removed. It must be recovered and delivered to a body authorised to collect waste oil;
refrigerant gas should not be discharged into the atmosphere. It should instead be recovered by means of type-approved devices, stored in suitable
cylinders and delivered to a company authorised for the collection;
the filter-drier and electronic components are considered special waste, and must be delivered to a body authorised to collect such items;
the foamed polyurethane rubber insulation material of the water exchangers must be removed and processed as urban waste.
This symbol means that this product must not be disposed of with household waste. Properly dispose of the unit according to local laws and
regulations. When the unit reaches the end of its useful life, contact the local authorities for information on disposal and recycling, or ask HITECSA. to
collect the used equipment free of charge. Separate collection and recycling of the product at the time of disposal will help conserve natural resources and
ensure that the unit is recycled properly to safeguard human health and the environment.
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