Trane CGCN Installation Operation & Maintenance page 18

Precautions against residual risks due to the control system
• make sure the instructions for use have been understood before carrying out any work on the control panel.
• always keep the instruction manual close at hand when working on the control panel.
• start up the unit only after having certified that it is correctly connected to the plant.
• inform the technician promptly of any alarms which appear on the unit.
• do not reset the alarms to manual restart without having first identified the cause and removed it.
Prevention against residual mechanical risks
• install the unit in accordance with the provisions of the following manual.
• carry out all the maintenance operations provided for by this manual regularly.
• wear a protective helmet before entering inside the unit.
• before opening a machine panel make sure that it is firmly connected by means of a hinge.
• do not touch the air condensation coils without having first put on protective gloves.
• do not remove the protections to the moving parts while the unit is running.
• before restarting the unit make sure that the moving part protections are in the correct position.
Prevention against residual electrical risks
• connect the unit to the mains in accordance with the provisions of this manual.
• carry out all maintenance operations regularly.
• before opening the control panel disconnect the unit from the mains by means of the external knife switch.
• check that the unit has been earthen correctly before starting it up.
• control all the electrical connections, the connection cables paying particular attention to the state of isolation;
replace the cables which are clearly worn or damaged.
• carry out periodic checks of the wiring inside the panel.
• do not use cables with an inappropriate section or flying connections not even for a limited period or in an
emergency.
Prevention against residual risks of a different nature
The residual risk due to pressure is mainly coming from non-functioning of the safety devices.
To prevent them it is necessary to follow the checks and replacements as following:
• To protect from safety devices exhausting it is not allowed to remove the protections while the unit is in
operation and to approach the unit without wearing the right protections. In case of accidental contact with
refrigerant due to the safety valves exhaust it is necessary to follow the above indicated
• carry out the plant connections to the unit by following the indications reported on the following manual and on
the panels of the unit itself.
• if a part is disassembled, make sure that it is correctly reassembled before restarting the unit.
• do not touch the discharge line of the compressor, the compressor itself or any other tube or component
which is inside the machine without putting on protective gloves.
• keep a fire extinguisher which is able to put out fires on electrical equipment near the machine.
• on units installed inside, connect the refrigerant circuit shut off valve to a network of tubes which are able to
lead the possible spillage of refrigerating fluid outside.
• eliminate any fluid loss inside or outside the unit.
• collect the discharge liquid and clean up any possible oil leakage.
• periodically clean the compressor casing of the accumulated dirt deposits.
• do not keep inflammable liquids near the unit.
• do not dispose of the refrigerant fluid and the lubricating oil in the environment.
• welding should only be carried out on empty tubes; do not approach the tubes containing refrigerant fluid with
flames or other sources of heat.
• do not bend or strike tubes containing pressurised fluids.
Precautions to be observed during maintenance operations
Authorised technicians may only carry out maintenance operations. Before carrying out any maintenance the
following must be performed:
• isolate the unit from the mains electricity by using the external knife switch.
• place a notice on the external knife switch which says "do not use - maintenance in progress".
• make sure that any possible on-off commands are disabled.
• use appropriate safety equipment (helmet, isolating gloves, protective glasses, safety shoes etc.).