Maintenance Instructions; Ordinary Maintenance; Special Maintenance; Instructions For Dismantling The Unit And Disposing Of Hazardous Substances - Hitecsa ADVANCE EQP1X Mode D'emploi

II.9

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 refrigerant fluid charge,
the upper part of the compressor casing and the
discharge line may reach temperatures as high as
180°C for brief periods of time.
II.9.1

ORDINARY MAINTENANCE

II.9.1.1 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.
II.9.1.2 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.
With the unit off, use the bleed valves inside the unit next to the water
outlet pipe. The valve is accessible manually by removing the right side
panel and/or the upper panel. Direct the bleed flow away from
electrically live parts.
 Circulating pump release
With the unit off, remove the right side panel and remove the screw that
holds the circulating pump in place. Turn the release screw located
inside, then put the screw that secures the circulating pump back into
place.
 Draining the water system
With the unit off, use the valves present near the water connection.
 Water exchanger cleaning
Plate exchangers are not subject to fouling in rated running conditions.
The working temperatures of the unit, the speed of the water in the
pipes and the suitable finish of the heat exchanging surface reduce
fouling of the exchangers to a minimum.
Any sludge that may form in the water circuit or any silt that cannot be
trapped by the filter, as well as extremely hard water conditions or high
concentrations of any antifreeze solution used, may clog the
exchangers and undermine their heat exchanging efficiency. In this
case you will need to clean the heat exchanger with suitable chemical
detergents.
Contact the HITECSA after-sales service office.
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.
IOM_EQP1X_117a133_208094_200901_ES-EN-FR-DE-IT
SECTION II: INSTALLATION AND MAINTENANCE
II.9.1.3 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.9.2

SPECIAL MAINTENANCE

II.9.2.1 Component replacement instructions
If a unit requires repair, switch it off and drain the refrigerant from both
the high and low-pressure sides, fluid line and all branches of the circuit
intercepted by the solenoid valves. This is because, if the refrigerant 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 risk, make sure that the pressure has
been drained from all branches before applying brazing torches.
II.9.2.2 Restoring the refrigerant charge
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.
II.10 INSTRUCTIONS FOR DISMANTLING THE UNIT
AND DISPOSING OF HAZARDOUS
SUBSTANCES
ENVIRONMENTAL PROTECTION!
HITECSA 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.
58