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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.
New model of high pressure switch: Danfoss ACB-4UA109W, from 1.8 to 2.8 Bar.
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
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