HWA1-A & HWA1-H
Air/Water chillers and heat pumps with axial fans
20
TERMINAL
TYPE
CONNECTION
ST4E
NTC sensor -10kΏ at 25°C β
3435
Plant water remote sensor
ST7E
NTC sensor -10kΏ at 25°C β
3435
Domestic water sensor
ID1E
Voltage free contact digital input
Double setpoint
ID2E
Voltage free contact digital input
Thermostat
ID2E
Voltage free contact digital input
Change operating mode
DO5E(phase)
DO5E N(neutral)
Under-voltage output 230Vac, 50Hz, 5A resistive, 1A inductive
Double set-point valve
DO6E(phase)
DO6EN(neutral)
Under-voltage output 230Vac, 50Hz, 5A resistive, 1A inductive
Signalization
DO7E(phase)
DO7E N(neutral)
Under-voltage output 230Vac, 50Hz, 5A resistive, 1A inductive
Signalization
8
START UP
Before start-up:
Check out the availability of the supplied wiring diagrams and manuals of the installed appliance.
Check out the availability of the electrical and hydraulic diagrams of the plant in which the unit is installed.
Check that the shut-off valves of the hydraulic circuits are open.
Verify that the hydraulic circuit has been charged under pressure and air vented.
Check out that all hydraulic connections are properly installed and all indications on unit labels are respected.
Check if all power cables are properly connected and all terminals are tightly fixed.
Check if the electrical connections are performed according to the norms in force including the grounding connection.
Check if the voltage is that shown in the unit labels.
Make sure the voltage is within the limits (±5%) of tolerance range.
Check if the electric heaters of the compressors are powered correctly.
Make sure that there is no refrigerant leak.
Be sure that all the cover panels are installed in their proper positions and locked with fastening screws before start up.
If the first start-up of the machine does not turn the display on of the controller, you must reverse the phase sequence of the
power supply cable.
WARNING: The unit must be connected to the electrical network and should be in STAND-BY mode (powered) closing
the general switch in order to operate the crankcase heaters of the compressor for a minimum of 12 hours before
start up. (The electric heaters are automatically powered when the main switch is switched off). The crankcase
heaters are working properly if, after some minutes, the temperature of crankcase’s compressor is about 10°C ÷ 15°C
higher than ambient temperature.
WARNING: Never switch off the unit (for a temporary stop) by switching off the main switch: this component should
be used to disconnect the unit from the power supply only for lengthy stoppages (e.g. seasonal stoppages). Besides,
failing the power supply, the crankcase’s heaters are not supplied thus resulting in a possible breakdown of the
compressors once the unit is switched on.
WARNING: Do not modify the internal wiring of the unit otherwise the warranty will terminate immediately.
WARNING: The summer/winter operating mode has to be selected at the beginning of the related season. Frequent
and sudden changes of these seasonal operating modes have to be avoided in order to prevent severe damages to
compressors.
WARNING: When you first install and start-up the unit make sure that the unit is working properly in both cooling
and heating modes.
8.1
POWER-ON/OF THE UNIT
For powering ON the appliance, rotate the outer handle of the disconnector to the ON position (indicated with "I").
The display on the machine is turned on only if the phase sequence is correct (verification to be done during initial startup).
Between a shutdown and subsequent power on, wait a minimum time of 1 minute.
9
INDICATIONS FOR THE USER
It’s important to take note of the identification data of the unit in order to provide them to the Technical Assistance Service in case
of assistance request.
The identification plate fixed on the unit shows the technical specifications and the performance of the equipment.
In case of manumission, removal or deterioration, please ask a duplicate to the Technical Assistance Service.
The manumission, removal or damaging of the nameplate makes difficult any operation of installation, maintenance
and spare parts request.
It is recommended to keep track of assistance operations that are executed on the unit; this will make easy searching any
troubleshooting.
In case breakdown or malfunction situations:
check the type of alarm to communicate it to the service center;
contact an authorized service center;
if required by the service center, turn off the unit immediately without resetting the alarm;
Ask the use of original spare parts.
