omi CHW Series, Руководство по эксплуатации и техническому обслуживанию, Страница: 5 / 76

710.1760.00.04-03A 28/11/2012
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The electricity supply must be disconnected in the event of fire. Fire extinguishers or fire extinguishing
systems filled with powder, foam or carbon dioxide should be used by preference. The chiller may also be
cooled with nebulized water. The use of water in large quantities must be avoided because if there is
leakage of refrigerant, the resulting chemical reaction – no matter how slight – may have a corrosive ef-
fect.
In any case, it is necessary to reduce the ambient temperature and/or that of the chiller and wait for the
temperature to fall before carrying out any work on the unit.
You are advised to include this device in your Fire Prevention Plan and Factory Safety Plan.
Make sure that suitable precautions have been implemented to avoid and combat any possible risks.
In the event of refrigerant leakage:
The refrigerant may lead to asphyxiation if it is inhaled in high concentrations. It is necessary to ensure
adequate ventilation for the room in which the chiller is installed.
Be sure to the read the safety data sheet with the relevant values and warnings.
Excessive pressure on the cooling medium side:
The chiller is equipped with safety devices on the cooling medium side.
These have to be mounted by the installation technician. The installation of any such devices must com-
ply with the applicable national standards and be carried out in accordance with the limits given in this
manual.
Depletion of the ozone layer:
The use of HFC refrigerants, in compliance with Regulation CE/842/2006, reduces damage to the ozone
layer and minimizes the greenhouse effect.
3. DESCRIPTION OF THE CHILLER, COMPONENTS AND OPTIONS
3.1 DESCRIPTION
The chiller is supplied ready for connection. It consists of a housing, a fully hermetically sealed cooling
medium circuit, the refrigerant circuit, the cooling medium circuit and the electrical circuit, including all
control and monitoring devices which are required for fully automatic operation. The selected and used
cooling medium must comply with environmental standards and the legal provisions.
3.2 REFRIGERANT CIRCUIT
STANDARD COMPONENTS USED IN THE CHILLER
The preceding abbreviations indicate the position in the drawings.
Not all components are contained in all models.
C– Compressor
Scroll-type compressor of fully hermetic design with integrated bimetal switch and oil sight glass.
Semi-hermetic compressor:
Semi-hermetic compressor with integrated bimetal switch and oil sight glass.
Reciprocating piston compressor:
Reciprocating piston compressor, fully hermetic with integrated bimetal switch and, in most models, an
oil sight glass.
CND – Condenser / Condenser safety grating
Condenser as fin-type heat exchanger consisting of copper pipes with aluminium fins. The safety grating
for the housing protects the condenser on the inside against mechanical damage. The positioning of the
condenser avoids any additional heat load on the components located inside the housing.
EVA – Evaporator
Insulated shell tube heat exchanger or stainless steel plate heat exchanger.
HP – High-pressure pressostat
The high-pressure pressostat protects the refrigeration circuit of the chiller against excessively high oper-
ating pressure (high-pressure fault).
In this kind of fault, the high-pressure pressostat switches the compressor off when the preset limit is ex-
ceeded. The compressor cannot be started up again until the preset differential pressure has been
reached and the Reset button located inside the chiller has been pressed. The fault is displayed on the
control unit.
LP – Low-pressure pressostat
The low-pressure pressostat protects the refrigeration circuit of the chiller against excessively low operat-
ing pressure (low-pressure fault).