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13 - AQUASNAP MAINTENANCE PROGRAM
All maintenance operations must be carried out by technicians
who have been trained on Carrier products, observing all
Carrier quality and safety standards.
Maintenance instructions
During the unit operating life the service checks and tests must
be carried out in accordance with applicable national regulations.
If there are no similar criteria in local regulations, the
information on checks during operation in annex C of standard
EN 378-2 can be used.
External visual checks: annex A and B of standard EN 378-2
Corrosion checks: annex D of standard EN 378-2. These
controls must be carried out:
-
After an intervention that is likely to affect the resistance
or a change in use or change of high-pressure refrigerant,
or after a shut down of more than two years. Components
that do not comply, must be changed. Test pressures
above the respective component design pressure must not
be applied (annex B and D).
-
After repair or significant modifications or significant
system or component extension (annex B)
-
After re-installation at another site (annexes A, B and D)
-
After repair following a refrigerant leak (annex D). The
frequency of refrigerant leak detection can vary from once
per year for systems with less than 1% leak rate per year
to once a day for systems with a leak rate of 35% per year
or more. The frequency is in proportion with the leak rate.
NOTE: High leak rates are not acceptable. The necessary
steps must be taken to eliminate any leak detected.
NOTE 2: Fixed refrigerant detectors are not leak detectors,
as they cannot locate the leak.
13.1 - Maintenance schedule
Regular maintenance is indispensable to optimise the operating
life and reliability of the equipment. Maintenance operations
must be carried out in accordance with the schedules below:
Service
Frequency
A
Weekly
B
Monthly
C
Annually
D
Special cases
If the equipment does not operate normally during maintenance
operations, please refer to the paragraph on diagnostics and
breakdowns of the '30RA/RH- 30RY/RYH “B” Pro-Dialog Plus'
controls manual.
IMPORTANT: Before each equipment maintenance
operation please ensure that:
-
the unit is in the OFF position
-
it is impossible for the unit to restart automatically
during maintenance.
13.2 - Description of the maintenance operations
The equipment is supplied with polyolester oil (POE). Only
use oil approved by Carrier. On request Carrier can carry out
an oil analysis of your installation.
Service A
Full-load operating test
Verify the following values:
-
compressor high-pressure side discharge pressure
-
compressor low-pressure side suction pressure
-
charge visible in the sight glass
-
temperature difference between the heat exchanger water
entering and leaving temperature.
Verify the alarm status
Service B
Carrier out the operations listed under Service A.
Refrigerant circuit
-
Verify the air heat exchanger cleanliness status and clean
it at least once a year, or more often if the equipment
environment is especially demanding. To clean the
equipment, follow the Carrier recommendations. Among
other things, this ensures that the unit performances can
be guaranteed.
-
Full-load operating test. In addition to the operations
described under Service A, check the following values:
-
compressor discharge pressure
-
compressor oil level
-
actual liquid subcooling
-
overheating at the expansion device
-
on heat pumps verify correct defrost of the air heat
exchanger.
-
Verify the charge status by checking the colour indicator
of the sight glass. If the colour has turned to yellow,
change the charge and replace the filter drier after
carrying out a leak test of the circuit.
Electrical checks
-
Check the tightening of the electric connections,
contactors, disconnect switch and transformer.
-
Check the status of the contactors, fuses and capacitators,
as required.
-
Carry out a quick test (refer to the manual for the
Aquasnap Pro-Dialog Plus control).
Mechanical checks
-
Verify that nothing impedes the rotation of the fan
impeller of the air heat exchanger.
Water circuit checks
-
Check the leak-tightness of the circuit.
