ROYAL CLIMA REV Series, Manual

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Section II :: Installation and maintenance
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II.4 INSTRUCTIONS FOR MAINTENANCE
DANGER!
Maintenance operations, even if for inspection
purposes only, must be carried out by skilled
technicians, qualified to work on air conditioning
and refrigeration products. Use suitable personal
protective equipment (gloves, goggles, etc).
DANGER!
Do not introduce pointed objects through the air
flow and intake grilles.
DANGER!
Always act on the general automatic switch (IG)
protecting the system before carrying out any
maintenance work, even if it is purely for inspection
purposes. Make sure that no one accidentally
supplies power to the machine; lock the general
automatic switch (IG) in the zero position.
DANGER!
In the event cooling or fan circuit component fail or
the refrigerant fluid charge drops, the upper part of
the compressor casing and the discharge line may
reach temperatures close to 180°C for brief periods
of time.
II.4.1 ROUTINE MAINTENANCE
II.4.1.1 Refrigerant circuit
o
Check refrigerant fluid charge
With the unit off, fit a pressure gauge on the test point on the outlet side
and another on the test point on the inlet side. Start up the unit and
check both pressure readings once they have stabilised.
o
Check for the absence of refrigerant fluid leaks
With the unit off, check the refrigerant circuit with a suitable leak
detector.
o
Check that the air side heat exchanger is clean.
In Off observe the air heat exchanger and, depending on the case:
 remove all foreign matter from the finned surface that may block the
passage of air;
 remove any dust deposits possibly aspirates;
 perform a mild washing with water, combined with a slight brushing;
 carry out the drying in air.
o
Check the cleanliness of the condensate drain
II.4.1.2 Electrical circuit
The following checks are recommended on the electrical circuit:
 check the unit power consumption using a clip-on meter and
compare the reading with the values shown in the technical data table;
 with the unit disconnected from the power supply, check and inspect
electrical contacts and terminals for tightness.
II.4.2 SPECIAL MAINTENANCE
II.4.2.1 Component replacement instructions
If a unit requires repair, switch it off and drain the refrigerant from both
the high and low pressure sides. This is because, if the coolant is only
drained from the high pressure side, the compressor springs may close
together, thereby preventing the pressure from equalising. In this way,
the low pressure part of the casing and the inlet line could remain
pressurised. In this case, if you apply a brazing torch to one of the low-
pressure components of the system, the pressurised mixture of
refrigerant and oil could blow out of the circuit and ignite on contact with
the brazing torch. To avoid this hazard and that resulting from triggering
of the safety valve, make sure that both the high and low pressure sides
of the circuit have actually been drained before applying brazing
torches.
II.4.2.2 Restoring the refrigerant load
The best way to load the refrigerant fluid is to load the unit on both
sides, high and low pressure simultaneously, to avoid overloading the
compressor which could damage it.
Topping up units with R410A refrigerant must be carried out in the liquid
phase, piping it from a cylinder so as not to alter its composition.<x3/>
II.4.2.3 Instructions to dismantle the unit and
dispose of hazardous substances
SAFEGUARD THE ENVIRONMENT!
Royal Clima has always cared about protecting
the environment.
When the unit is dismantled it is important to
adhere scrupulously to the following procedures.
The unit must only be dismantled by a firm authorised for the disposal
of scrap machinery/products.
The unit as a whole is composed of materials considered as secondary
raw materials and the following conditions must be complied with:
 the compressor oil must be removed, recovered and delivered to a
facility authorized to collect waste oil;
 refrigerant fluid should not be discharged into the atmosphere. It
should instead be recovered by means of homologated devices, stored
in suitable cylinders and delivered to a company authorised for the
collection;
 the filter-drier and electronic components (electrolytic condensers)
are considered special waste, and must be delivered to a body
authorized to collect such items;
 the foamed polyurethane rubber and foamed polyethylene mesh
pipe insulation, the foamed polyurethane (which surrounds the storage
tank), the polystyrene packaging and the sound-absorbent sponge
lining on the bodywork must be removed and processed as urban
refuse.