Vertiv Liebert HPC-M Serie Manuel De Service page 9

5) Connection of the clean contacts for the machine
status signals.
The panel has clean contact for the machine status signals.
The clean contacts can be used only with PELV type
sources, as described by the norm CEI EN 60204---1
"Safety of machinery --- Electrical equipment of ma-
chines".
The table below shows the available terminals and their
meaning (refer to the wiring diagrams for further informa-
tion).
The cable passage must be arranged as described in the
previous point. Ethernet cable connection.
Note:
The power supply should never be disconnected, except
when performing maintenance.
Operate the main switch before carrying out any mainte-
nance work on electrical components.
Note:
It is forbidden to operate on the electrical components
without using insulating platforms, or in the presence of
water and humidity.
Note:
The supply to the external pump assembly must be made
before starting the refrigerating unit and must be kept on
as long as the chiller is in use; incorrect operation will
cause the unit to lock out because of the internal protec-
tions (flow switch intervention).
Note:
The compressors are equipped with an electronic protec-
tion device blocking their start if the phase sequence is not
correct, or stopping their operation if a thermal relay in-
tervenes; this device is essential for the integrity of the
mechanical and electrical components of the compressors.
After having eliminated the reasons for the stop, reset the
standard functions by cutting this device off.
Note:
The chillers are equipped with own microprocessor con-
6
trol adjustment: the use of the remote ON---OFF (enclo-
sed in the electric board terminal board) as system ther-
mostating element is forbidden.
4 --- Start---up and operation
4.1 --- Initial check
1) Check all water connections.
2) Open the discharge valve (and the suction valve, if in-
stalled) of the compressor and the shut---off valve on
the liquid line.
3) Ensure that the intake pressure is higher than 4.0 bar:
if this is not the case, prolong pre---heating of the com-
pressor (see Fig. 11 Refrigeration circuits) and check
that the refrigerant shut---off valve is properly sealed.
4) Open all isolating valves and/or water ball valve
5) In case of climates with temperatures below zero de-
grees C, make sure the chilled water circuit is filled
with the correct concentration of water/glycol.
6) Bleed all air out of the chilled water circuit.
7) Verify the water flow rate and its direction.
8) Ensure that the thermal load is sufficient for start---up.
Caution:
The outer air temperature probe (installed only in the Su-
perchiller models with freecooling) must be positioned in
the shade and protected against the weather.
4.2 --- First start---up
(or after a long stop)
Operate as follows:
1) At least 8 hours before the start--- up, power the crank-
case heaters by setting the operating knife switch ON.
Make sure the auxiliary circuit has been powered and
check the operation (a fault due to an incorrect proce-
dure will invalidate the compressor guarantee).
2) Open the valves of the refrigerating circuit that had
been closed before the initial check.
3) Check the machinery supplying the thermal load con-
nected with the unit and start the system pump/s.
4) MAKE SURE THE COMPRESSOR OIL HAS BEEN
HEATED FOR AT LEAST 8 HOURS; start the unit
only then.
5) Make sure the fans rotate in the correct direction
(counterclockwise): check the electrical connections,
if necessary.
6) Make sure the pumps rotate in the correct direction.
7) During the unit start--- up a temperature of the water/-
glycol inlet higher than 20˚C is allowed. Under stan-
dard operating conditions check that the limits indi-
cated in paragraph 2.1 are not exceeded.
8) Check the correct operation of the control and safety
devices.
9) Check the outlet temperature of the chilled water
(check if the set---point set on the control is reached).
10) Check the compressor oil level.
11) With the compressor at full load, check there are no
bubbles visible in the flow indicator. If there are any,
charge the unit according to par. 5.
English