SystemAir SyScrew Water EVO CO 1070 /S, Руководство по установке и обслуживанию

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7 - Product Description (continued)
7.5 Water heat exchangers
Evaporator
The units are provided with a direct-expansion refrigerant/water shell
and tube heat exchanger with several refrigeration circuits.
Evaporators are insulated with flexible insulation, based on closed
cell synthetic rubber in black color, 9 mm thick, highly resistant to
water and to water vapour. A synthetic leather coating, 1.1 mm thick,
protects the outer surface.
Condenser
All units are equipped with one or two condensers, one each circuit.
Heat exchanger is shell and tube type, arranged for ispection,
cleaning and maintenance operation.
Desuperheater
All units are available with desuperheaters (DSH). DSH is refrigerant/
water heat exchanger with brazed plates.
DSH is fitted on the compressor discharge pipe and it’s dimensioned
to recover about the 10% of total rejected heat. Units with a single
compressor are provided with a single heat exchanger, while units
with two compressors are provided with two heat exchangers, one
each circuit
Total heat recovery condenser
All units are available with total heat recovery condenser (THRC).
THRC is refrigerant / water heat exchanger with brazed plates or shell
and tube, according to chiller size. THRC is fitted on the compressor
discharge line in series with the standard condensing circuit. Heat
recovery function is enabled supplying heat recovery exchanger with
water. Units with a single compressor are provided with a single
heat exchanger, while units with two compressors are provided with
two heat exchangers, one each circuit. Heat recovery condensers
are insulated with flexible insulation, based on closed cell synthetic
rubber in black color, 9 mm thick.
7.6 Electric power supply and control system
All units are provided with a microprocessor and a “Chiller Control”
system.
The electrical connection of the controls and the startup units for the
motor are carried out and tested in the factory. The power supply
and control components are separate and accessible from different
doors.
A door stop disconnecting switch is always mounted on the door of
the unit. Protection level is in accordance with IP54 standard.
The power supply compartment includes:
Q
Master switch
Q
Network isolator, contactors, compressor fuses
Control panel includes:
Q
A transformer for auxiliaries, fuses, relay and electronic card, a
thermostat for the compressor’s delivery temperature
Q
The keyboard and the display of the “Chiller-Control”
microcomputer, mounted on the door of the control section.
7.7 Accessories
List of available accessories, provided separately, to be mounted on
site by the installer:
Water flow switch
Prevents the operation of the unit when the chilled fluid is insufficient.
It is advisablem to install a flow switch, to ensure the correct
operation of the unit.
Water filter
Filter to be mounted on the suction side of the water heat exchanger.
It is mandatory to install a water filter to remove impurities from the
water suplly.
Antivibrating supports (AVM)
Isolating spring supports, equipped with bolts for fastening to
the base. They are supplied separated from the unit and must be
mounted on site by the customer, at his own expense.
Remote wall terminal
Makes it possible to check the unit through a remote terminal, up to
a maximum distance of 400 meters.
Modem GSM
Makes it possible to check the working mode or the switching on/off
of the unit via SMS. In case of any alarms, the unit sends an SMS
to the user.
RS-485 serial card (for MODBUS or LONWORK or BACNET)
A communication interface makes it possible to control and manage
the unit from a local station, with RS485 connection, up to a distance
of 1000 m.
It is possible to obtain the remote control and the management, by
inserting the control into the management plant of the building.