pag 17
START-UP
ALL THE EQUIPMENT MUST BE COMMISSIONED BY AUTHORISED SERVICE CENTRES.
THIS SERVICE IS LIMITED TO START-UP OF THE UNIT ONLY AND NOT THE CONNECTIONS OR INSTALLATION OF
THE SYSTEM.
ONLY QUALIFIED TECHNICIANS MUST PERFORM THE FOLLOWING OPERATIONS.
PRELIMINARY CHECKS
Before checking, please verify the following
1. the unit should be installed properly and in conformity
with this manual.
2. the electrical power supply line should be sectioned at
the beginning.
3. the sectioning device is locked and the proper warning
“not to operate” sign is placed on the handle.
4. make sure no tension is present
5. the coils must be clean and free of obstacles
6. the ventilators must be free of leaves, cardboard, fixed
obstacles (beams, barriers, etc.), snow, etc
7. the external ventilators must not be blocked
The external ventilators can be subject to a temporary
block, especially if the inactivity period before the first
start-up was quite long or if external temperature is
very low. It is also possible to unblock them manually
(ONLY WHEN THE UNIT IS UNPLUGGED – RISK
OF INJURES) so that jams or electric overloads are
avoided when the unit is restarted.
AERAULIC SYSTEM
Check that:
1. the air filters are not removed from unit and are
cleaned (possible ventilation checks and the operating
starting period determinate a ducting “cleaning” with
conseguent filter precocius clogging, filters that must
be cleaned and replaced)
2. ducting are completed, connected and without
obstructions
3. possible dampers are opened (for ex. fire stop
dampers) and calibrated (for ex. external air damper,
control damper, ejection damper)
4. Grilles, outlets, and diffusers must be free of
obstructions (furniture, shelves, etc.), open and pre-
calibrated, so as to ensure proper air distribution,
which is essential to comfort in the room.
REFRIGERANT SYSTEM
Carefully check the refrigerating circuit: the presence of oil
stains can mean leakage caused by transportation,
movements or other).
Open the cocks of the refrigerator circuit, if there are any.
Using the unit manometers, if present, or service
manometers, verify that the refrigerating circuit is in
pressure.
Make sure that all the service outlets are closed with
proper caps; if caps are not present a leak of refrigerant
can be possible.
WATER SYSTEM
Ensure that the plumbing system has been washed. Drain
the wash water before connecting the unit to the system.
Check that the water circuit has been filled and
pressurised.
Perform a seal check at max. working pressure checking
that no leaks are present.
Check that the shut-off valves in the circuit are in the
"OPEN" position.
Check that there is no air in the circuit. If required, bleed it
using the vent valves in the system.
Check that there are no ARIES EFFECTS in the transient
(pump and / or valve activation/deactivation)
When using antifreeze solutions, make sure the glycol
percentage is suitable for the type of use envisaged.
% weight of ethylene
glycol
10 % 20 % 30 % 40 %
Freezing point
- 4 °C - 9 °C - 15 °C - 23 °C
Safety temperature
- 2 °C - 7 °C - 13 °C - 21 °C
Check that the circulator pumps are not blocked. In fact,
their motor shaft may seize up, especially after long
shutdowns. Unblocking can be accomplished with a
screwdriver using the purge hole.
ELECTRICAL SYSTEM
Check the proper tightening of the screws that fix the
conductors to the electrical components in the board
(during handling and transportation, the vibrations could
have loosened them).
Verify that the unit is connected to the ground plant.
Control that all panels and protection devices of the unit
are repositioned and blocked.
Charge the unit by closing the sectioning device, but leave
it on OFF.
Make sure that the tension and net frequency values are
within the limit of:
230 +/- 6% single phase unit; 400/3/50 +/- 6% three-phase
unit
Control the unbalancing of the phases: it must be lower
than 2% .
Example:
L1 - L2 = 388 V, L2 - L3 = 379 V, L3 - L1 = 377 V
average of the measured values = (388 + 379 + 377) / 3 =
381
maximum deviation from the average = 388-381= 7V
Unbalancing = (7/381) x 100 = 1.83% = ACCEPTABLE
Operating out of the indicated limits causes the loss of the
guarantee as well as very serious damages.
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