18
7 - START-UP
Verify that the unit is connected to the ground plant
Check the conductors tightening: the vibrations caused by
handling and transport might cause loosing
Feed the unit by closing the sectioning device, but leave it on
OFF.
Check the tension and line frequency values which must be
within the limits :
400/3/50
+/-
10%
Control the unbalancing of the phases:
it must be lower than 2%
Example:
7.5 ELECTRICAL CIRCUIT
7.6 COMPRESSOR CRANKCASE RESISTANCES
Feed the oil resistances on the compressor crankcase at least
8 hours before the start compressor :
•
at the first unit start-up
•
after each prolonged periods of inactivity
1.
Feed the resistances closing the unit isolator
(sorter??).
2.
Control the resistances electrical absorption to be
sure that they’re function .
3.
Carry out start-up only if the compressor crankcase
temperature on the lower side must be higher at least
of 10° C than the outside temperature.
Do not start the compressor with the crankcase oil below ope-
rating temperature .
Weight of glycol (%)
10 20 30 40
Freezing temperature (°C)
-4 -9 -15 -23
Safety temperature (°C)
-2 -7 -13 -21
7.1 PRELIMINARY INFORMATION
The indicated operations should be done by qualified
technician with specific training on the product.
Upon request, the service centres performing the start-up; the
electrical, water connections and the other system works are
by the installer.
Agree upon in advance the star-up data with the service
centre.
7.2 PRELIMINARY CHECKS
7.3 REFRIGERANT CIRCUIT
7.4 HYDRAULIC CIRCUIT
Before checking, please verify the following :
•
the unit should be installed properly and in conformity with
this manual.
•
the electrical power supply line should be sectioned at the
beginning.
•
The line sectionalizing device is open, locked and equip-
ped with the suitable warning
•
make sure no tension is present
1. Check carefully the refrigerating circuit: the presence of oil
stains can mean leakage caused by transportation, move-
ments or other).
2. Verify that the refrigerating circuit is in pressure: Using the
unit manometers , if present, or service manometers.
3. Make sure that all the service outlets are closed with pro-
per caps; if caps are not present a leak of refrigerant can
be possible.
1. Before realizing the unit connection make sure that the
hydraulic system has been cleaned up and the clearing
water has been drained
2. Check that the water circuit has been filled and
pressurized
3. Check that the shut-off valves in the circuit are in the
"OPEN" position.
4. Check that there isn’t air in the circuit, if required,
evacuate it using the air bleed valve placed in the system
high points.
5. When using antifreeze solutions, make sure the glycol
percentage is suitable for the type of use envisaged.
The working out of the limits can cause irreversible damages
and voids the warranty.
L1
L2
L3
388 V
379 V
377 V
388
+ 379 + 377
3
=
381
388
(max)
–
381
= 7
7
381
x 100 =
1,83 OK
1)
2)
3)
