Cooling Circuit - flowair AURA HCS Series Installation And Operating Instruction

Detailed information on individual inputs
/ outputs and control unit configuration is
given in the ACS Control System Manual.
The table shows the basic parts of the
external electrical connection of cooling
equipment for electrical installation.
Detailed information and wiring diagram
are supplied with the device.

A - Power connection - power
supply from the network 400/3 /
N / PE, 50Hz

B - External control - ExtOn signal
for remote start, AlmExt signal
for information about the alarm status of the cooling device (can be configured in the ACS system)

C - ModBUS - connection for ModBUS communication via RS485, optionally Ethernet

D - DCU - digital switching of cooling capacity for versions U - condensing unit

E-ACU - analog control of cooling capacity for versions U - condensing unit

3.4. Cooling circuit

HCS cooling units can have 1 cooling circuit with 1 to 3 compressors as standard.
Soldering of cooling circuits with a protective atmosphere performed by certified personnel. Before filling with refrigerant,
each cooling circuit of the unit is subjected to a pressure test, a leak test and then evacuated.
Each cooling unit is subjected to a complete functional test or a functional test by means of a computer simulation
(condensing unit type CU or condenser with a remote evaporator).
The cooling circuit is equipped as standard:

hermetic or replaceable cartridge type filter-dehydrator,

solenoid valve, (CU version - included)

thermostatic or optionally electronic expansion valve, (CU version - included)

sight glass with humidity indicator, (CU version - included)

low pressure switch,

high pressure switch with manual reset,

temperature sensor on the compressor discharge,

high-pressure and optionally low-pressure sensor,

shut-off valve before entering the condenser,

safety valves for pressure relief according to the requirements of EN 378-2 and suction line insulation.
Depending on the version, the device is further equipped with a suction line temperature sensor, a four-way valve, non-
return valves, a collector and a liquid separator.
In preparation for commissioning, it is necessary to check whether the equipment has not been damaged or there has been
no refrigerant leakage:
• Visually complete and potential for unwanted mechanical damage to the cooling circuit elements
• Potential refrigerant / oil leak - visually, by leak detector or bubble method
• Tighten screw connections, especially oil lines, manometer nuts and service valves
• The refrigerant pressure in the idle state of the device must correspond to the ambient air temperature on the high
pressure side - the pressure can be checked on the device monometers (optional equipment), by connecting a
service manometer or on the control unit
The following is the basic technological single-circuit diagram of the cooling circuit together with a table of abbreviations
used and explanations.
FLOWAIR sp. z o.o. / OMSAC210708EN 16