Use Of Hcs Units; Basic Description Of The Standard Execution - flowair AURA HCS Series Installation And Operating Instruction

Use of HCS units

HCS cooling equipment is designed primarily for powering air conditioning systems in commercial and industrial buildings, as
well as for cooling in industrial applications. The units are a source of cooling or heating medium for secondary systems.

Basic description of the standard execution

(A detailed technical description of selected technological parts can be found later in the text of this manual.)
Operating limits
Standard design - cooling works at full load up to 0°C, with fan speed control (EC fans) and low-temperature design up to
-20°C. In the summer season, the unit operates up to 45°C. Extreme temperature protection is monitored by the ACS limiting
function. The setting of the required water temperature depends on the type of liquid used, the minimum required value for
water is 4°C (for further details see the ACS technical documentation).
The heating mode is effective down to -15°C and the water temperature is controlled by a function with restriction at very
low temperatures. The maximum set value for hot water heating is 55°C.
Condensing unit control
The CU version is externally controlled by digital or analog signals to the main controller of the unit. One or two levels of
digital control are available, depending on the number of compressors or analog control (0-10 V input) with predefined
switching levels (see ACS technical documentation for more details).
External control
Each unit can be controlled by an external on / off signal to the master controller and also sends an alarm signal to the
superior control system.
Control System
Sophisticated control system ensures data collection and subsequent control in real time, so as to ensure maximum
operational efficiency with respect to energy savings and life of technological components of the unit. The main functions of
the application are performed:

Cooling / heating power control based on measured parameters, dynamically adjusting unit power to maximize
energy efficiency.

Limitation of cooling / heating capacity in situations leading to operation at the limit of the technological possibilities
of the unit.

Three-level alarm system protects against damage caused by operation beyond the technological capabilities of the
device.
Switchboard MaR
Control panel, components and cabling manufactured in accordance with EN 60204-1. One mains connection point,
protection class IP 54, phase sequence protection and optionally heated control box. Main on / off switch installed on the
front panel, numbered and marked electrical wires for easy maintenance and service. All power components (compressors,
fans, pumps) are thermally protected.
HMI panel with protective cover or supplied for remote installation on request.
Control unit
The main microprocessor controller preconfigured during the factory test with default settings helps you get it up and running
quickly. Intuitive user interface with three levels of access - user, experienced user and technician.
The RS485 serial communication port enables remote management via ModBUS® or BacNET® control protocols. Optional
Ethernet port.
Compressors
Hermetic scroll compressors from a renowned producer with axial and radial adaptability for excellent reliability and
efficiency, equipped with crankcase heaters. Compressors with low noise and vibration levels are installed on anti-vibration
silentblocks, optionally equipped with anti-noise casings or structural covers.
Electronic discharge temperature monitoring and integrated motor thermal overload protection. Check valve on discharge.
Measuring the operating time and number of compressor starts helps to optimize the switching sequence and service
diagnostics.
Water heat exchanger
AISI 316 stainless steel plate heat exchanger, externally insulated with caoutchouc insulation is located inside the chiller
structure. The Victaulic grooved or threaded hydraulic water connection is led out of the housing of the unit.
3-step frost protection with differential pressure switch, NTC water temperature sensor and low refrigerant pressure sensor
with ACS limiting function.
Air heat exchanger with fans
Long-term reliable plate heat exchanger with aluminum fins and copper tubes, optionally equipped with a protective metal
grille.
FLOWAIR sp. z o.o. / OMSAC210708EN 4