Table of Contents
Advertisement
4.- MAINTENANCE
4.5.- CORRECTIVE MAINTENANCE
IMPORTANT MAKE SURE THAT THE UNIT IS COMPLETELY DISCONNECTED FROM THE POWER SUPPLY WHEN
CARRYING OUT ANY TYPE OF WORK ON THE MACHINE.
If some component in the cooling circuit must be replaced, follow these recommendations:
•
Always use original replacement parts.
•
Regulation imposes the recovery of refrigerant fluids, as well as preventing their discharge into the atmosphere. The refrigerant
must be recovered and evacuated from the refrigeration circuit using a recovery unit and a vacuum pump dedicated to A2L. It must
be ensured that the outlet of the vacuum pump is not near any potential source of ignition and that ventilation is available.
•
The system must be flushed with inert gas (dry nitrogen). Compressed air or oxygen must not be used to purge refrigerant
systems.
•
If cuts must be made in the pipe work, use pipe cutters. Do not use saws or any other tools that produce filings.
•
All brazing must be carried out in a nitrogen aosphere to prevent corrosion from forming. Use silver alloy brazing rod.
•
Take special care that the flame from the torch is aimed in the opposite direction from the component to be welded and is covered
with a wet rag in order to avoid overheating.
•
Disassemble the components with a cutting tool.
•
Drain, recover and dispose of the compressor oil as appropriate.
Nitrógen
•
Take very special care if 4-way check valves are to be replaced since these have internal components that are very heat-sensitive
(plastic, teflon etc...).
•
If a compressor must be replaced, disconnect it electrically and un-braze the suction and discharge lines. Remove the securing
screws and replace the old compressor with the new one. Check that the new compressor has the correct oil charge, screw it to
the base and connect the lines and electrical connections.
•
Carry out the vacuum above and below through the Schrader valves of the outdoor unit until -750 mm Hg is reached.
•
Once this level of vacuum has been reached, keep the pump in operation for at least one hour. DO NOT USE THE
COMPRESSOR AS A VACUUM PUMP. If the compressor runs in vacuum it will fail.
•
Charge the unit with refrigerant according to the data on the Rating Plate for the unit and check that there are no leaks.
PRECAUTIONS TO BE TAKEN IN THE USE OF R32 REFRIGERANT
The following precautions characteristic of this gas should be taken:
•
The Vacuum Pump must have a Check Valve or Solenoid Valve.
•
Pressure Gauges and Hoses for the exclusive use with R32 Refrigerant should be used.
•
The charge should be carried out in the Liquid Phase.
•
Always use scales to weight-in charge.
•
Use the Leak Detector exclusive for R32 Refrigerant.
•
Do not use mineral oil, only synthetic oil to ream, expand or make connections.
•
Keep pipes capped before using them and be very thorough about any possible moisture and dirt (dust, filings, burrs,
etc.).
•
Brazing should always be carried out in a nitrogen atmosphere.
•
Reamers should always be well sharpened.
•
The refrigerant bottle must contain at least 2 % of the total amount.
•
All the components derived from the recycling of the unit should be managed according local legislation, and have to be
classified and separated while dealt by authorized waste manager or be left in local waste facilities.
•
Refrigerant fluids, electronic boards, heat exchangers and the oil extracted from the refrigerant circuit, as well as the
oil recipients used must be recycled as hazardous waste according the local normative through an authorized waste
manager or be left in local waste facilities. The rest of the components considered as non-hazardous wastes must be
recycled according to the corresponding norms.
•
At the end of its life, the equipment should be recycled in local waste facilities or by an authorized waste manager.
Installation manual / eCOMFORT R32-MIL166E-0222 - 09/2022
Direction of the flame
Wet rag
Component to be welded
Silver alloy welding rod
• 82 •
Hide quick links:
Advertisement
Table of Contents
