Level 3 Maintenance - CIAT AQUACIAT LD 150R Instruction Manual

13 - STANDARD MAINTENANCE
Mechanical checks:
■ Check that the mounting bolts for the ventilation
sub-assemblies, fans, compressors and electrics box are
securely tightened
Hydraulic checks:
■ When working on the water circuit, take care not to damage
the adjacent air heat exchanger,
■ Check the water connections,
■ Check the condition of the expansion tank (presence of
corrosion or loss of gas pressure) and replace it if required,
■ Drain the water circuit (see chapter "Water flow control
procedure"),
■ Clean the water filter (see chapter "Water flow rate control
procedure"),
■ Replace the gland packing of the pump after 20000 hours of
operation and the bearings after 17500 hours,
■ Check the operation of the low water flow safety device,
■ Check the condition of pipe thermal insulation,
■ Check the concentration of the anti-freeze protection solution
(ethylene glycol or propylene glycol),
■ Check the water flow via the heat exchanger pressure
difference,
■ Check the condition of the heat-transfer fluid or the water
quality,
■ Check for corrosion of the steel pipe work.
Refrigerant circuit checks:
■ The unit is subject to F-gas tight regulatory checks. Please
refer to the table in the introduction.
■ Check the unit operating parameters and compare them with
the previous values,
■ Check the operation of the high pressure switches. Replace
them if there is a fault,
■ Check the fouling of the filter drier. Replace it if required,
■ Keep an up-to-date service booklet specific to the refrigeration
unit in question.
Ensure all adequate safety measures are taken for
all these operations: use appropriate PPE (personal
protective equipment), comply with all industry and
local regulations, use common sense.

13.4 - Level 3 maintenance

Maintenance at this level requires specific skills, qualifications,
tools and expertise. Only the manufacturer, his representative
or authorised agent are permitted to carry out this work.
This maintenance work relates to the following:
■ Replacement of major components (compressor, water heat
exchanger),
■ Operations on the refrigerant circuit (handling refrigerant),
■ Modification of factory-set parameters (change of application),
■ Movement or disassembly of the refrigeration unit,
■ Any operation due to proven lack of maintenance,
■ Any operation covered by the warranty,
■ One or two leak detection operations per year performed by
qualified personnel using a certified leak detector.
■ To reduce waste, the refrigerant and the oil must be transferred
in accordance with applicable regulations, using methods that
limit refrigerant leaks and pressure drops and with materials
that are suitable for the products.
■ Any leaks detected must be repaired immediately
■ The compressor oil that is recovered during maintenance
contains refrigerant and must be treated accordingly.
■ Pressurised refrigerant must not be vented to the open air.
■ If the refrigerating circuit must be opened, cap all openings
for a period of up to one day. If open for longer, blanket the
circuit with a dry, inert gas (e.g. nitrogen).
EN-59 AQUACIAT™ LD/ILD