Trane CCUF, Installation Operation & Maintenance

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2.9 PRECAUTIONS TO BE OBSERVED DURING MAINTENANCE
OPERATIONS
Only authorized technicians may 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.).
If measurements or controls must be carried out which require the machine to be running the following observations must
be followed:
• operate with the electrical panel open for as short a time as is possible.
• close the electrical panel as soon as the individual measurement or control has been carried out.
• for units which are located outside, do not carry out interventions in dangerous atmospheric conditions such as rain,
snow, fog etc.
The following precautions should also be taken at all times:
• never dispose of fluids contained in the refrigerant circuit into the environment.
• when replacing the electronic card always use appropriate equipment (extractor, anti-static bracelet, etc.).
• if a compressor, the evaporator, or any other heavy part is to be replaced, make sure that the lifting equipment
matches the weight to be lifted.
• if the unit has an independent compressor compartment, do not open the ventilator compartment without
having first isolated the machine using the knife switch on the side of the panel and only after having placed a
sign which says “do not use - maintenance in progress”.
• if modifications must be carried out to the cooling, hydraulic or electrical circuit of the unit, as well as to its
command logic, contact Trane .
• if particularly complicated assembly or disassembly operations are to be carried out contact Trane .
• always use original spare parts bought directly from Trane or from official dealers of the companies reported
in the list of recommended spare parts.
• if the unit is to be moved after a year of being in the site or if it has to be dismantled contact Trane .
IMPORTANT: No high pressure safety valve is installed on the unit by Trane The unit fail safe is assured by cut-
out of the electrical power supply to the coils of the compressors contactors. The cut-out action is carried out by
the electrical contact of the high pressure switch installed on the relevant refrigerant circuit. No Schraeder valve
is installed in the service socket the circuit high pressure switch is screwed into. This implies that the
replacement of the high pressure switch requires that the relevant refrigerant circuit has been discharged of all
the refrigerant inside it.
Figure 1 – Indicative position of the signs warning about the necessity of replacing the high pressure
switches with the unit void of refrigerant related to the lack of high pressure safety valves