22.05 – 4037365_03
55
WARNING Do not use your hands to control any refrigerant leaks;
WARNING Before removing elements along the under pressure hy-
dronic circuits, shut-off the pipe section involved and gradually drain
the fluid until its pressure and that of the atmosphere are balanced.
Prevention against residual electrical risks
• Before opening the electrical panel, disconnect the unit from the mains
by means of the external isolator;
• If the unit has power factor correction condensers, wait the time indica-
ted on the machine plate from when the power supply was disconnected
from the unit before accessing inside the electrical panel;
• If the unit has components such as integrated inverters, disconnect the
power supply and wait at least 15 minutes before accessing it for main-
tenance operations: the internal components remain energised for this
period, generating the risk of electrocution;
• If the supply cord is damaged, it must be replaced by the manufacturer or
its service agent or a similarly qualified person in order to avoid a hazard.
ROUTINE AND EXTRAORDINARY MAINTENANCE
The machine must be turned off and electrically disconnected during its
maintenance (with possible replacement of components).
In particular:
— Place a sign reading "Do not turn on – maintenance in progress" on the open
isolator;
— Equip yourself with the appropriate personal protective equipment;
— The cooling circuit components must be replaced after draining the refrigerant
gas contained in the circuit;
— Always and only use original spare parts which can be purchased from author-
ised resellers;
— It is not permitted to change the refrigerant, hydraulic or electric layout of the
unit, or its control logic unless expressly authorised by Aermec;
— The machine must be loaded with the type and quantity of refrigerant indicated
on the identification label.
The compressor input and output pressure and temperature for determining the
overheating and undercooling of the machine must be measured as follows:
— With the machine off, access its cooling circuit;
— Connect the necessary instruments,
pressure gauges
connected with suitable
extensions to the pressure sockets on the compressor inputs and outputs,
ther-
mometers
connected to thermocouple probes that are fastened to the pipes at
the compressor inputs and outputs. Do not use metratasts, as they require the
operator to approach the machine's cooling circuit;
— Turn on the machine and acquire the measurements, remaining at a distance
and in a position not exposed to the pressurised parts of the cooling circuit;
— As soon as the measurements have been completed, turn off them machine,
remove the instruments and close the cooling circuit compartment.
— In the case of machines that do not have a cooling circuit compartment closed
with a metal structure, the high-low pressure pressure switch must be tested
with the operator in front of the machine panel where the control panel is lo-
cated, remaining at a distance and not exposed to the pressurised parts of the
cooling circuit.
Replacement of the compressor
Inspection and control
The leak inspection and control operations on the machine must be performed
when the machine is off and not electrically powered.
Cleaning the machine
The machine cleaning activities must be performed when the machine is off and
not electrically powered.
DECOMMISSIONING AND DISPOSING OF THE MACHINE
COMPONENTS
WARNING The unit contains fluorinated greenhouse gases that are
regulated by the Kyoto protocol. The law prohibits its disposal in the
environment and requires it to be collected and delivered to the re-
seller or a collection centre.
When the components are removed for replacement or when the entire unit reach-
es the end of its service life, it must be removed from the installation, in order to
minimise the environmental impact, observing the following requirements for dis-
posal:
— The refrigerant gas must be fully collected by specialised personnel with the
necessary qualifications in specific containers and be delivered to collection
centres;
— The lubrication oil contained in the compressors and in the cooling circuit must
be collected and delivered to collection centres;
— The structure, electrical and electronic equipment and components must be
divided according to their product category and material of construction and
delivered to collection centres;
— If the water circuit contains mixtures with anti-freeze, the content must be col-
lected and delivered to collection centres;
— Observe the national laws in force.
Summary of Contents for NLC 0280H
Page 2: ......
