Precautions During Maintenance Operations - comatec AQWL Installations- Und Wartungshandbuch

periodically check the board's internal wiring
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do not use cables having an inadequate section or flying
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connections, even for limited periods of time or in an emergency
Prevention of other residual risks
make sure that the connections to the unit conform to the
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instructions provided in this manual and on the unit's panelling
if you have to disassemble a piece, make sure that it has been
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properly mounted again before restarting the unit
do not touch the delivery pipes from the compressor, the
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compressor and any other piping or component inside the
machine before wearing protective gloves
keep a fire extinguisher fir for electrical appliances near the
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machine
on the units installed indoor, connect the safety valve of the
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refrigeration circuit to a piping network that can channel any
overflowing refrigerant outside
remove and leak of fluid inside and outside the unit
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collect the waste liquids and dry any oil spillage
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periodically clean the compressor compartment, to remove any
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fouling
do not store flammable liquids near the unit
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do not disperse the refrigerant and the lubricating oil into the
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environment
weld only empty pipes; do not approach flames or other sources
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of heat to refrigerant pipes
do not bend/hit pipes containing fluids under pressure
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2.6 Precautions during maintenance operations

Maintenance operations can be carried out by authorised technicians
only.
Before performing any maintenance operations:
disconnect the unit from the mains with the exter nal
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disconnecting switch
2 - Safety (continued)
place a warning sign "do not turn on - maintenance in progress"
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on the external disconnecting switch
make sure that on-off remote controls are inhibited
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wear suitable personal protective equipment (helmet, safety
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gloves, goggles and shoes etc.)
To carry out any measurements or checks which require the
activation of the machine:
work with the electrical board open only for the necessary time
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close the electrical board as soon as the measurement or check
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has been completed
for outdoor units, do not carry out any operations in the presence
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of dangerous climatic conditions (rain, snow, mist etc.)
The following precautions must be always adopted:
do not scatter the fluids of the refrigeration circuit in the
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surrounding environment
when replacing an eprom or electronic cards, use always suitable
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devices (extractor, antistatic bracelet, etc.)
to replace a compressor, the evaporator, the condensing coils or
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any other weighty element, make sure that the lifting equipment is
consistent with the weight to be lifted
in air units with independent compressor compartment, do not
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access the fan compartment unless you have disconnected the
machine by the disconnecting switch on the board and you have
placed a warning sign "do not turn on - maintenance in progress"
contact manufacturer for any modifications to the refrigeration,
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hydraulic or wiring diagram of the unit, as well as to its control
logics
contact manufacturer if it is necessary to perform very difficult
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disassembly and assembly operations
use only original spare parts purchased directly from
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manufacturer or the official retailers of the companies on the
recommended spare parts list
contact manufacturer if it is necessary to handle the unit one year
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after its positioning on site or if you wish to dismantle it.
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