Start-Up; Preparation For Commissioning; Electrical Checks Of The Unit Disconnected From The Power Supply; Electrical Checks Of The Unit Connected To The Power Supply - AERMEC WSA Serie Manual Técnico De Instalación Y Mantenimiento

23. 1 PREPARATION FOR COMMIS-
SIONING
CAUTION
All operations (electrical and hydrau-
lic connections, filling and bleeding
of the air from the system), must be
completed before the intervention of
the AERMEC assistance service.
Before performing the checks indica-
ted below, make sure that the unit is di-
sconnected from the mains, using the
suitable instruments.
23. 1 . 1 ELECTRICAL CHECKS, OF THE
UNIT DISCONNECTED FROM
THE POWER SUPPLY
- Check that the general power supply
cables are of a suitable section, able
to withstand the overall consump-
tion of the unit, and that the unit has
been duly earthed.
- Check all the electrical connections
are correctly fixed and all the termi-
nals adequately closed.
23. 1 .2 ELECTRICAL CHECKS, OF THE
UNIT CONNECTED TO THE
POWER SUPPLY
The following operations must be car-
ried out when the unit is powered up.
- Use a tester to check that the supply
voltage value is 230V ±10% or 400V
±10%, depending on the version.
- Check that the wiring connected by
the installer comply with the wiring
layouts on board the machine.
- Power up the unit by turning ON the
main switch. The display will light up
some seconds after the unit is powe-
red up, check that the operation sta-
tus is OFF.
23. 1 .3 HYDRAULIC CIRCUIT
CHECKS
- Check that the system has been
washed and that the cleaning water
has been discharged before the unit
is connected to the system
- Check that all the hydraulic connec-
tions are correctly made and that the
indications on the plates are obser-
ved.
- Check that the hydraulic system is
full and under pressure, and also

START-UP

23
make sure that there is no air (if there
is air, bleed it).
- Check that any interception valves
on the system are correctly opened.

23.2 COMMISSIONING

NOTE
For the setting of all functional para-
meters and for detailed information re-
garding machine functioning and the
control card, refer to the user's manual.
After carefully carrying out all the che-
cks detailed above, it is possible to start
up the unit. Check the set working
parameters (set-point) and reset any
alarms that may be present. After a few
minutes, the unit will start up.
23.2. 1 COOLING CIRCUIT
CHECKS
- Check for refrigerant gas leaks, es-
pecially near pressure inlets and
pressure switches. (vibration during
transport may have loosened the
connectors).
- THE HIGH PRESSURE SWITCH
stops the compressor and generates
the relative alarm when the delivery
pressure exceeds the set value.
To check whether this device works
correctly, close the water intake to
the condenser and, observing the
pressure gauge, which may have
been installed by the user or instal-
ler because it is not supplied by the
factory in the corresponding high
pressure inlets, verify whether the
switch is tripped at the calibrated va-
lue.
CAUTION
If the switch does not trip at the cali-
brated value, immediately stop the
compressor and identify the cause.
The alarm reset is manual and can
only enabled once the pressure drops
below the differential value.

23.2.2 OVERHEATING

Check the level of overheating by com-
paring the temperature indicated with
a contact thermometer placed on the
compressor suction and the tempera-
ture shown on the pressure gauge (sa-
turation temperature corresponding to
the evaporation pressure).
The difference between these two
temperatures gives the superheating
value. Optimum values are between 4
and 8°C.
In these units the pressure gauge is not
supplied; it is advisable to install it in
the corresponding pressure inlet.

23.2.3 UNDER-COOLING

Check the level of under-cooling by
comparing the temperature indicated
with a contact thermometer placed on
the tube at the condenser outlet and
the temperature shown on the high
pressure gauge (saturation temperatu-
re corresponding to the condensation
pressure).
The difference between these two
temperatures gives the under-cooling
value. Optimum values are between 4
and 5°C.
In these units the pressure gauge is not
supplied; it is advisable to install it in
the corresponding pressure inlet.

23.2.4 DELIVERY TEMPERATURE

If the under-cooling and superheating
values are correct, the temperature
measured in the delivery tube at the
compressor outlet must be 30/40°C
above the condensation temperature.
33