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English
5 START-UP
The unit must be started for the first time by
personnel suitably trained by one Authorised
Service Centre. Failure to meet this require-
ment will immediately void the warranty.
The operations carried out by authorised
personnel are limited to the start-up of the
unit, and do not include any other operation
on the plant, such as, for example, electrical
and hydraulic connections etc. All the other
operations before start-up, including oil pre-
heating for at least 12 hours, must be per-
formed by the Installer.
5.1 Preliminary check
The checks listed below shall be performed before
starting the unit and before the arrival of the personnel
authorised.
n
Check the section of power supply and grounding
cables; make sure that terminals are tightened and
check the correct operation of contactors, with the
main switch open.
n
Check that any voltage and phase variation in the
power supply does not exceed the prefixed thresh-
olds.
n
Connect the contacts of the flow switch and the ther-
mal relay of the pump and of the other devices (if
any), to terminals 1-2 and 3-4, respectively.
n
Check that the components of the external water
circuit (pump, user equipment, filters, power supply
tank and reservoir, if any) have been installed prop-
erly, and according to the manufacturer’s instruc-
tions.
n
Check the filling of the hydraulic circuits, and make
sure that the fluid circulation is correct, without any
trace of leaks and air bubbles. If you use ethylene
glycol as antifreeze, check that its percentage is cor-
rect.
n
Check that the direction of rotation of the pumps is
correct, and that fluids have been circulating for at
least 12 hours for both pumps. Then, clean the filters
on the suction side of the pumps.
n
Adjust the liquid distribution network in such a way
that the flow rate is within the specified range.
n
Check that the water quality is up to the specifica-
tions.
n
Check that oil heaters, if any, have been turned on
at least 12 hours before.
5.2 Start-up
Start-up sequence:
n
Turn on the Main switch (at least 12 hours before).
n
Check that the oil in the compressor has reached the
requested temperature (the minimum temperature
outside the pan must be approx. 40°C) and that the
auxiliary control circuit is energised.
n
Check the operation of all the external equipment,
and make sure that the control devices of the plant
are properly calibrated.
n
Start the pump and check that the water flow is cor-
rect.
n
Set the desired fluid temperature on the control
board.
n
Start the appliance (see Chapter 6).
n
Check the correct direction of rotation of compres-
sors. Scroll compressors cannot compress the re-
frigerant when they rotate in the opposite direction.
To make sure that they are rotating in the correct
direction, simply check that, just after the start-up
of the compressor, the pressure drops on the LP side
and rises on the HP side. Furthermore, if a scroll
compressor rotate in the opposite direction, there is
a considerable rise in the sound level of the unit, as
well as in a dramatic reduction of current absorp-
tion compared to normal values. In case of wrong
rotation, the scroll compressor can be definitely
damaged.
n
After about 15 minutes of operation check that there
are no bubbles, through the sight glass on the liquid
line.
The presence of bubbles may indicate that a
part of the refrigerant charge has been re-
leased in one or more points. It is important
to remove these leaks before proceeding.
n
Repeat the start-up procedure after removing the
leaks.
n
Check the oil level in the compressor’s sight glass.
Start-up
WARNING
NOTE
WARNING
