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II.10 MAINTENANCE INSTRUCTIONS
DANGER!
Maintenance operations, even if for inspection
purposes only, must be carried out by skilled
technicians, qualified for working on air
conditioning and refrigerant products. Use suitable
personal protection (gloves, eye protection etc).
DANGER!
Do not introduce pointed objects through the air
inlet or outlet grilles.
DANGER!
Always use the mains switch to isolate the unit
from the mains before carrying out any
maintenance work on the unit, even if it is for
inspection purposes only. Make sure that no one
accidentally supplies power to the machine, lock
the mains switch in the OFF position.
DANGER!
In the case of cooling or fan circuit component
breakage or a drop in the coolant gas charge, the
upper part of the compressor casing and the
drainage line may reach temperatures as high as
180°C for brief periods of time.
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.
• Checking the condition 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;
• 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 chilled water system.
Use the bleed valve located inside the unit near the water outlet pipe,
and, in the T versions, on the pump compartment too. Use the relative
silicon pipes to channel away the water from the machine.
• Draining the water system
In the T units, with the unit switched off, the system may be drained
using the draincock located at the bottom of the storage tank and by the
cap on the pump. In units with no storage tank and with the unit off,
emptying is possible by means of a draincock under heat exchanger hot
water outlet pipe.
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.
All manuals and user guides at all-guides.com
34
SECTION II: INSTALLATION AND MAINTENANCE
II.10.1.3 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 switched off and disconnected from the power supply,
check and inspect electrical contacts and terminals for tightness.
II.10.2 SPECIAL MAINTENANCE
II.10.2.1 Component replacement instructions
Before replacing components, 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 prevent this risk and also the risk arising from the
safety valve cutting in, it is important to check that pressure has been
effectively released from both sides of the circuit 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 R407C refrigerant (R32/R125/R134a) must be
carried out in the liquid phase, piping it from a cylinder so as not to alter
its composition.
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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