13 - STANDARD MAINTENANCE
Level 1 cleaning:
-
Remove all foreign objects or fragments/debris attached to
the coil surface or wedged between the chassis and the
supports.
-
Use a low-pressure dry air jet to remove all traces of dust from
the coil.
Level 2 cleaning:
-
Carry out the level 1 cleaning operations.
-
Clean the coil using suitable products.
Use appropriate PPE including safety glasses and/or mask,
waterproof clothes and safety gloves. It is recommended to
wear clothing that covers the whole body.
Specific products approved by the manufacturer for cleaning
coils are available from the manufacturer's spare parts
network. The use of any other product is strictly prohibited.
After the cleaning product is applied, rinsing with water is
mandatory (see manufacturer's standard RW01-25).
IMPORTANT: Never use a pressure water spray without a
large diffuser.
Concentrated and/or rotating water jets are strictly
forbidden.
Never use a fluid with a temperature above 45°C to clean
the air heat exchangers.
Correct and frequent cleaning (approximately every three
months) will prevent 2/3 of the corrosion problems. Protect
the electrics box during cleaning operations.
13.7 - Water-cooled heat exchanger
Check that:
-
The insulation has not been detached or torn during
operations,
-
The heaters and probes are operating and correctly positioned
in their support,
-
The water-side connections are clean and show no sign of
leakage,
-
The periodic inspections required by local regulations have
been carried out
13.8 - Frequency inverter
Before any work on the frequency inverter, ensure
that the circuit is isolated and there is no voltage
present (reminder: the capacitors take approximately
5 minutes to discharge once the circuit breaker has
been opened). Only appropriately qualified
personnel are authorised to work on the frequency
inverter.
In case of any alarm or persistent problem related to the
frequency inverter, contact the manufacturer's service.
The frequency inverters fitted on the units do not require a
dielectric test, even if being replaced: they are systematically
checked before delivery. Moreover, the filtering components
installed in the frequency inverter can falsify the measurement
and may even be damaged. If there is a need to test the insulation
of the unit components (fan motors and pumps, cables, etc.),
the frequency inverter must be disconnected at the power circuit.
13.9 - Refrigerant volume
It is essential to run the unit in cooling mode to find out whether
the charge is correct; this is done by checking the actual
subcooling.
Following a slight leak, it will be possible to feel a drop in the
refrigerant charge from the initial charge, and this will affect the
subcooling value obtained at the air-cooled exchanger outlet; it
cannot, however, be felt in heating mode.
IMPORTANT: it is therefore not possible to optimise the
charge in heating mode following a leak. The unit must be
run in cooling mode if the charge needs topping up.
AQUACIAT
POWER
ILD
EN-66
