Commissioning; Preliminary Operations - AERMEC VENICE Manual Del Usuario

6. 1

PRELIMINARY OPERATIONS

ATTENTION
Before carrying out the controls
indicated below, ensure that the unit is
disconnected from the electric mains,
using the appropriate instruments.
6. 1 . 1 Electric controls of the unit
without voltage
- Check that the main power supply
cables have appropriate section,
able to support the total absorption
of the unit and that the unit has been
duly connected to earth.
- Check that all of the electric
connections are correctly fixed and
all clamps are suitably tightened.
6. 1 .2 Electric controls of the live
unit
The followibng operations must be
carried out when the unit is live.
- Use a tester to check that the power
supply voltage value is equal to 230V
±10%.
- Check that the connections made by
the installer comply with the wiring
diagrams on the machine.
- Apply voltage to the unit by placing
the master switch in the ON position.
The display will switch on for a few
seconds after voltage is applied,
check that the functioning mode is at
OFF.
- Use a tester to check that the power
supply voltage value is equal to 230V
±10%. when the compressor is
working.
6. 1 .3 Hydraulic circuit checks
- Check that the plant has been
washed well and that the water used
for washing is discharged before the
unit was connected to the plant.
- Check that all hydraulic connections
have been performed correctly, that
plate indications are complied with.
- Check that the hydraulic plant is full
and pressurised, also check there
is no air present and bleed it if
necessary.
- Check that any interception valves
present on the plant are open
correctly.
- The anti-freeze control managed
by electronic regulation and by the
temperature probe positioned at
the exit of the evaporator prevents
the formation of ice when the water

COMMISSIONING

6
flow rate is too low. The control of its
correct functioning can be performed
by progressively increasing the anti-
freeze set point until the water exit
temperature is exceeded keeping
the temperature of the water
under control using a high-precision
thermometer. Check that the unit is
off, generating the corresponding
alarm. After this operation, take
the anti-freeze set point back to its
original value.
- Check that the flow meter works
correctly; by closing the interception
valve at the exit of the heat exchanger
the unit must display the block, at the
end re-open the valve and re-arm the
block.
5. 1 .4 Cooling circuit controls
- Check the cooling circuit: any
stains can be a sign of leaks, (caused
by transport, handling or other)
- Check that the cooling circuit is
pressurised
- Check that all of the utility sockets
are closed using caps; their absence
could determine loss of refrigerant.
6.2 COMMISSIONING
NOTE
On request, free commissioning by the
local AERMEC After-Sales Service is
envisioned for units in this series.
The commissioning must be previously
agreed on the basis of plant realisation
times. Before the intervention of
the AERMEC After-Sales Service all
operations (electric and hydraulic
connections, loading and bleeding of
the air from the plant) must have been
finished.
Refer to the user manual for setting of
all functional parameters and detailed
information regarding functioning of
the machine and the control board.
After having scrupulously performed
all of the above-mentioned checks
the unit can be started by pressing
the ON key. Check the set functioning
parameters (set-point) and reset any
alarms present. The unit will start after
a few minutes.
6.2. 1 Cooling circuit checks
- Check for the presence of any
refrigerant gas leaks particularly
around the pressure points, pressure
transducers and and
switches. (during transport, the
vibrations may have loosened the
connections).
- THE HIGH PRESSURE PRESSURE
SWITCH
This stops
generating the relative alarm, when
the delivery pressure exceeds the
set value.
Its correct functioning can be
controlled by closing the condenser
water and keeping the manometer
under control, eventually installed
by the user or installer as it is not
supplied by the factory, in the relative
high pressure points. Check the
intervention in correspondence with
the calibration value.
ATTENTION
If their is no intervention at the
oil calibration value, stop the compressor
immediately and check the causes.
ALARM reset is manual and can only
take place when the pressure falls
below the differential value.
- THE LOW
SWITCH
(present
versions)
It stops the compressor, generating
the relative alarm, when the intake
pressure falls below the set value.
ATTENTION
If their is no intervention at the
calibration value, stop the compressor
immediately and check the causes.
ALARM reset is manual and can only
take place when the pressure falls
below the differential value..
6.2.2 Overheating
Check overheating by comparing the
temperature read by a thermometer in
contact positioned on the compressor
intake with the temperature shown
on the manometer
temperature corresponding with the
evaporation pressure).
The difference between these two
temperatures gives the overheating
value. The optimal values are between
4 and 8°C.
The manometer is not supplied
with these units. Installation is
recommended
pressure point.
6.2.3 Undercooling
pressure
Check undercooling by comparing the
the compressor,
PRESSURE PRESSURE
only in the cooling
(satuation
on the relative
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