Handling Of Safety Devices; Phase Controller Kit (Option) - CIAT aquaciat 2 LD Serie Handbuch

Handling of safety devices

All the unit's safety devices are managed by the regulator's
electronics card. If a safety device triggers and shuts down the
unit, it is necessary to locate the fault, reset the safety device if
required and then acknowledge the defect by pressing the
"RESET" button on the display card.
The unit then restarts when the minimum time imposed by the
anti-short circuit mechanism has elapsed.
For information on the adjustment values of the various safety
devices and the procedure for the acknowledgement of the
various faults, consult the instructions for the CONNECT
regulator.
Low pressure control
Every unit is equipped as standard with a LP sensor for each
hydraulic circuit. This sensor allows users to view the LP value
and also enables the electronics module to perform its safety
function by not permitting the LP value to fall below the fault
threshold parameterized in the regulator.
High pressure control
● Manual high-pressure pressostat.
Each refrigerant circuit is equipped with a HP pressostat which
fulfils a safety function. Thus, when the HP value rises above
the value that has been preset in the pressostat, the power
supply to the relevant compressor(s) in the refrigerant circuit is
cut and the fault is indicated by an LED on the regulator's
control panel.
The HP pressostats have to be reset manually. The fault is
therefore acknowledged when you reset the pressostat by
pressing the RESET button on the control panel.
Note: some units possess two pressostats per circuit
(electrically connected in series).
● High-pressure sensor
Every unit is equipped as standard with a HP sensor for each
refrigerant circuit. This sensor allows the user to view the HP
value and enables the electronics module to perform both a
unit regulation function by acting on the fans, and a safety
function.
Evaporator antifreeze protection
The evaporator is protected against freezing by two sensors:
● Evaporator chilled water outlet sensor
Each evaporator is equipped with an antifreeze sensor (located
at the chilled water outlet) which monitors the temperature of
the fluid that is to be cooled. If this falls below the value that has
been set in the regulator, the power supply to the relevant
compressor(s) in the refrigerant circuit is cut and the fault is
indicated by an LED on the regulator's control panel.
This sensor performs a safety function and must not therefore
be replaced by the customer.
● Freon sensor at evaporator inlet
This sensor monitors the temperature of the refrigerant at the
evaporator inlet. If this falls below the value that has been set
in the regulator, the power supply to the relevant compressor(s)
in the refrigerant circuit is cut and the fault is indicated by an
LED on the regulator's control panel.
● LP sensor
The LP sensor and the exchanger water outlet sensor perform
permanent monitoring to avoid the breakage of the
exchangers. If the values of these two sensors become too
divergent, the circuit in question shuts down and the fault is
indicated by a message and the illumination of a red LED at the
control panel.
Evaporator water circulation controller
Every unit possesses a water circulation control mechanism
fitted as standard. Thus, if the water flow is insufficient, the
power supply to the compressor(s) is cut and an LED indicates
the dault at the regulator's control panel.
Internal compressor protection
All the models in the AQUACIAT 2 range are protected against
overheating of the electric motor and excessive outlet
temperatures.
A phase controller may be added at the customer's request
(OPTION)
Outlet sensor
Every unit is equipped as standard with an outlet sensor for
each refrigerant circuit. This sensor, which is located on the
discharge pipe allows the user to view the value of the outlet
temperature and enables the electronics module to fulfil its
safety function.
Thus, when the outlet temperature value rises above the
maximum temperature threshold that has been parameterized
in the regulator, the power supply to the relevant compressor(s)
in the relevant refrigerant circuit is cut and the fault is indicated
by an LED on the regulator's control panel.
Fire protection
Every refrigerant circuit in the units contains a mechanism to
protect against the risk of overpressure due to a fire (fusible
plug or valve blockage).

Phase controller kit (OPTION)

The phase controller kit makes it possible to perform the
following functions:
- monitor the direction of rotation of the phases
- detect the total absence of one or more phases
- monitor overvoltages or undervoltages
This kit consists of:
- the network controller relay + rail and fixing screws
- connecting cables
- assembly instructions
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