IOM SYSCREW AIR EVO HSE

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7 - Product Description (continued)
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 10-15% of total rejected heat. Each unit is
equipped with 2 exchangers, one for each circuit.
Total heat recovery condenser
Some 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 pipe in parallel with the standard cooling circuit. The heat
recovery function is by means of a four-way valve. Each unit is
equipped with 2 exchangers, one for each circuit. Exchangers are
insulated with UV ray-proof 19 mm-thick anticondensate closed-cell
polyethylene material.
7.6 Air heat exchanger
Coils are microchannel type, made of 100% aluminum (fins, tubes
and headers). Tube and fins coils (copper/aluminium) are available
as option
7.7 Fans
The condenser’s fans are of large diameter (800 mm) axial type.
They are EC brushless type up to around 900Rpm for standard and S
versions, up to around 1100 Rpm for HT and HPF versions. They are
provided with external diffusers (nozzles), that reduce the aeraulic
motor to a large extent. Each fan is provided with galvanised steel
accident-prevention guard, painted after assembly.
Finally, the fans’ motors are completely closed, protection class
IP55, protection thermostat immersed in windings.
7.8 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 available, and is mounted
on the door of the appliance, supply side. The cabinet includes
also another door, that can be opened from the top, waterproofed
according to IP54 standard.
The power supply compartment includes:
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Master switch
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Network isolator, contactors, compressor fuses
Control panel includes:
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A transformer for auxiliaries, fuses, relay and electronic card, a
thermostat for the compressor’s delivery temperature
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The keyboard and the display of the “Chiller-Control”
microcomputer, mounted on the door of the control section.
7.9 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.
RS485 serial card (for MODBUS 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.
Internal hydro kits
Consist of pump(s) and relevant accessories (tank is not available
inside the unit).
Hydraulic module
"Consist of one or two centrifugal pumps standardized to EN 733,
ISO 5199 and directive 2009/125/EC. Three-phase electrical motor,
protected to IP55, insulation class F. In the case of two pumps (One
Operational and one standby), the standby pump starts once the
operational pump breaks down. "
Variable flow hydraulic module
"Consist of one or two centrifugal pumps standardized to EN 733,
ISO 5199 and directive 2009/125/EC. Three-phase electrical motor,
protected to IP55, insulation class F, coupled with an inverter
(protected to IP55), which modulates the current’s frequency
between 25 and 50 Hz. The two pumps are managed to balance their
running time. The inverter is used to manage the pumps is placed in
a dedicated panel and is driven directly by the unit’s controller. "
External hydro kits
Consist of buffer tank, pump(s), relevant accessories and with or
without tank antifreeze heater.