RHOSS TCAEY-THAEY 115 P1 Instrucciones De Uso página 32

II.10.1 ORDINARY MAINTENANCE
II.10.1.1 Refrigerant circuit
• Refrigerant fluid charge control
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.
• Check for the absence of refrigerant fluid leaks
With the unit off, check the refrigerant circuit with a suitable leak
detector.
• Check the cleanliness of the air-side heat-exchanger:
With the unit off, inspect the air-side heat-exchanger, and, depending
on its condition, proceed as follows:
• remove any foreign bodies from the finned surface which may
obstruct the air flow;
• clean off the dust deposit, if possible by vacuuming it;
• wash and brush, gently, with water and gentle brushing;
• air dry.
• keep the condensation drain pipes free of any obstructions.
II.10.1.2 Water circuit
• Checking the water differential pressure switch
With the unit running normally, slowly close the isolating valve on the
unit water inlet pipe. If, during a test phase, the point is reached where
the isolating valve is completely closed without the differential pressure
valve cutting in, stop the unit immediately by pressing ON/OFF on the
control panel and replace the component.
• Bleeding air from the water system.
The air bleed is facilitated by manual cocks positioned inside the unit,
which can be accessed by opening the technical compartment
panelling. The Tank & Pump models are also equipped with an
automatic bleed valve fitted at the top of the water buffer tank. For
model 133 with Tank & Pump installation, you also need to work on the
manual valve accessible directly from outside the unit.
• Expansion tank pre-charge pressure
The pre-charge pressure can be checked on the charge connection
(see Expansion tank technical data).
• Draining the water system
In the Tank & Pump units, drainage is facilitated by the specific cock
positioned at the bottom of the tank. In the Standard and Pump units,
the system can be drained through the bleed valve positioned on the
water outlet pipe. To ascertain that the water system has been
completely drained, open all the manual bleed valves positioned inside
the unit.
ENVIRONMENTAL PROTECTION!
If the system has an antifreeze additive, it must not
be drained freely, because it causes pollution. It
should be collected for possible recycling. The
filling valve must not be opened in the presence of
glycol water.
II.10.1.3 Electric 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 switched off and disconnected from the power supply,
check and inspect electrical contacts and terminals for tightness.
SECTION II: INSTALLATION AND MAINTENANCE
II.10.2 EXTRAORDINARY MAINTENANCE
II.10.2.1 Component replacement instructions
If a unit requires repair, drain the refrigerant from both the high and low-
pressure sides and in the liquid line. 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, make sure that both the high
and low pressure sides of the circuit have actually been drained before
applying brazing torches.
II.10.2.2 Topping up the refrigerant
Rapidly filling with refrigerant on the inlet side of a single-phase system
may prevent the compressor from starting or cause a breakage. The
best way to avoid this situation is to charge both sides, high and low
pressure, simultaneously.
Topping up units with R410A refrigerant (R32/R125) must be carried
out in the liquid phase, piping it from a cylinder so as not to alter its
composition.
DANGER!
The safety valve is calibrated to 41.7 bar. It could
cut in if the calibration valve is reached during the
refrigerant charging operations, causing a burst
that could cause scalding.
II.11 INSTRUCTIONS FOR DISMANTLING THE UNIT
AND DISPOSING OF HAZARDOUS
SUBSTANCES
ENVIRONMENTAL PROTECTION!
RHOSS
has always been aware of the importance
of protecting the environment. When the unit is
dismantled, it is important to adhere scrupulously
to the following procedures.
The unit should only be dismantled by a firm authorized for the disposal
of scrap machinery/products.
The unit as a whole is composed of materials which can be treated as
SRM (secondary raw materials) and the following conditions must be
observed:
• the compressor oil must be removed, recovered and delivered to a
body authorized to collect waste oil;
• if the appliance contains antifreeze, this should not just be disposed
of freely, as it causes pollution. It should be collected for possible
recycling.
• 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 shrink-wrap, the polystyrene packaging and the sound-
absorbent sponge lining on the bodywork must be removed and
processed as urban refuse.
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