Standard Maintenance; Level 1 Maintenance; Level 2 Maintenance - Carrier AQUASNAP 30RBM Series Installation, Operation And Maintenance Instructions

13 - STANDARD MAINTENANCE

To ensure optimal efficiency and reliability of the equipment
and all its functions, we recommend taking out a maintenance
contract with the local organisation set up by your manufacturer.
This contract will include regular inspections by the
manufacturer's Service specialists so that any malfunction is
detected and corrected quickly, ensuring that no serious
damage can occur. The manufacturer's service maintenance
contract is the best way to ensure the maximum operating life
for your equipment and, through the expertise of manufacturer's
qualified personnel, provides the ideal way to manage your
system energy consumption effectively.
The refrigeration equipment must be serviced by professionals;
however, routine checks may be carried out locally by
specially-trained technicians. See the standard EN 378-4.
All refrigerant charging, removal and recovery operations
must be carried out by a qualified technician and with the
correct equipment for the unit. Any inappropriate handling
can lead to uncontrolled fluid or pressure leaks.
IMPORTANT:
Before performing any work on the unit ensure it is de-
energized. If a refrigerant circuit is opened, it must be
evacuated, recharged and tested for leaks. Before any
operation on a refrigerating circuit, it is necessary to evacuate
the refrigerant charge from the device using a load transfer
unit.
Simple preventive maintenance will allow you to get the best
performance from your HVAC unit:
• Optimisation of energy performance,
• Reduced electricity consumption,
• Prevention of accidental component failure
• Prevention of major time-consuming and costly work,
• Protection of the environment.
There are five maintenance levels for HVAC units, as defined
by the AFNOR X60-010 standard.
NOTE: Any deviation from or failure to comply with
these maintenance criteria will render the guarantee
conditions for the refrigeration unit null and void, and
will release the manufacturer from its liability.

13.1 - Level 1 maintenance

These simple procedures can be carried out by the user:
• Visual inspection for traces of oil (indicates a refrigerant
leak),
• Check for leaks in the circuit (monthly),
• Clean the air-cooled exchangers (see the dedicated
chapter),
• Check that the protective grilles are present and in good
condition, and that the doors and covers are properly
closed,
• Check the unit's alarm report (see the control manual),
• Verify the refrigerant charge in the liquid line sight glass,
• Verify the temperature difference at the heat exchanger
inlet and outlet is correct,
• Check for any general signs of deterioration,
• Check the anti-corrosion coatings.

13.2 - Level 2 maintenance

This level requires specific expertise in electrical, hydraulic
and mechanical systems. it is possible that this expertise may
be available locally; there may be a maintenance service,
industrial site or specialist subcontractor in the area.
The frequency of this maintenance may be monthly or annual,
depending on the type of check.
In these cases, the following maintenance operations are
recommended:
Carry out all level 1 operations, then:
Electrical checks (annual checks):
• At least once a year tighten the electrical connections for
the power supply circuits (see tightening torques table),
• Check and tighten all control connections, if required,
• Check the labelling of the system and instruments, re-
apply the missing labels if required,
• Remove the dust and clean the interior of the electrical
boxes. Be careful not to blow dust or debris into
components; use a brush and vacuum wherever possible,
• Clean the insulators and bus bar supports (dust combined
with moisture reduces the insulation gaps and increases
current leakage between phases and from phase to
ground),
• Check the presence, condition and operation of electrical
protective devices,
• Check the presence, condition and operation of control
components,
• Check that all heaters are operating correctly,
• Replace the fuses every 3 years or every 15000 hours
(ageing),
• Check that no water has penetrated into the electrical
box,
• On the electrical box and for units equipped with an
inverter, regularly check the cleanliness of the filter media
to maintain the correct air flow.
• Check that the capacitor is operating correctly (Power
factor correction option).
Mechanical:
• Check that the mounting bolts for the ventilation sub-
assemblies, fans, compressors and electrics box are
securely tightened
Hydraulic:
• 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.
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