Main Functions; Safety Device Management - CIAT DYNACIAT power LG Serie Manual De Instrucciones

the electronic module will activate or deactivate the compressors
in series.
In a standard configuration of the unit, the cold water or hot
water control sensor is placed on the evaporator water return
(chilled water production use) or condenser (heat pump use).

16.2 Main functions

• Water temperature control:
- Evaporator chilled water.
- Condenser hot water.
• 3 possible types of control:
- Water return difference.
- Water outlet PID temperature.
- Control according to outdoor temperature
In the standard configuration, the units use the chilled water
return control. For PID water outlet temperature control, refer
to the Connect2 control manual.
• Operating settings monitoring.
• Fault diagnosis.
• Fault storage in the event of a power failure.
• Management and automatic equalisation of compressor
operating time (multi-compressors).
• Remote control (Start/stop, temperature setpoint adjustment,
operating states, general fault) (OPTIONAL).
• Remote control reporting of operating states and faults using
an interface module (OPTIONAL).
For a detailed description of all these functions refer to the
CONNECT2 user manual

16.3 Safety device management

All of the unit's safety devices are managed by the electronic
circuit board in the regulator. If a safety device is triggered
and stops the unit, trace the fault, reset the safety device if
necessary, then clear the fault with the "RESET" button on the
CONNECT2 console.
The unit will restart when the minimum time required by
the short-cycle protection elapses. To ascertain the setting
values of the different safety devices and the fault clearance
procedures, refer to the CONNECT2 regulator instructions.
Ø Low-pressure control (LP)
Each unit includes one low pressure sensor per refrigerating
circuit as standard. This sensor enables the user to display the
LP value and enables the electronic module to provide a safety
function by ensuring that the LP value does not fall below the
threshold parameter in the regulator.
Ø High pressure control (HP)
• High pressure switch.
Each refrigerating circuit is equipped with an HP pressure
switch.
The HP safety pressure switch is the main safety device for
the unit during operation. It will be set according to the type of
fluid. Thus, when the HP value exceeds the preset value of the
pressure switch, power to the compressor(s) in the refrigerating
circuit concerned is cut off and the fault is indicated by an LED
on the regulator console.
The HP pressure switches are reset manually, thus any
fault will be cleared by resetting the pressure switch and by
pressing the RESET button on the console.
Note: Certain devices have two pressure switches per circuit
(connected electrically in series).
• High pressure sensor
Each unit includes one high pressure sensor per refrigerating
circuit as a standard item. This sensor enables the user to
display the HP value and enables the electronic module to
perform two functions: Regulation of the unit, by controlling the
fans, and a safety function.
Ø Evaporator frost protection
The evaporator is protected against freezing by two sensors:
• Evaporator chilled water outlet sensor
Each evaporator is fitted with an antifreeze protection sensor
(located on the chilled water outlet) which monitors the
temperature of the fluid to be cooled. If this temperature falls
below the set value in the regulator, power to the compressor(s)
in the refrigerating circuit concerned is cut off and the fault is
indicated by an LED on the regulator console. This probe acts
as a safety device and must therefore never be moved by the
customer.
• Freon sensor on evaporator inlet or on the circuit 1 or 2
pressure sensor (LP) (DYNACIAT
models).
This sensor monitors the temperature of the refrigerant at the
evaporator inlet. If this temperature falls below the set value in
the regulator, power to the compressor(s) in the refrigerating
circuit concerned is cut off and the fault is indicated by an LED
on the regulator console.
Ø Evaporator water circulation controller
Every unit is fitted with a water circulation control device as
standard. Thus, if the water flow is insufficient, the power
supply to the compressor(s) is cut and an LED indicates the
fault on the regulator console.
Ø Internal compressor protection
Every model in the LG LGP range is protected against
overheating of the electric motor and high discharge
temperatures.
The DYNACIAT power LG, LGP 700 V to 2400 V versions are
equipped with compressors with internal protection against
missing phases and phase reversal.
On all models, an optional phase controller may also be added
if the customer wishes.
Ø Discharge sensor
Each unit includes one discharge sensor per refrigerating
circuit as standard. This sensor located on the discharge
piping makes it possible for the user to view the discharge
temperature value and enables the electronic module to
provide a safety function.
If the discharge
temperature threshold set in the regulator, the power supply to
the compressor(s) for the refrigerating circuit concerned is cut
and the fault is indicated by an LED on the regulator console.
Ø Overpressure protection
Each refrigerating circuit in each unit is protected against the risk
of overpressure resulting from fire.
• Fire valves
- The fire valve or valves protect the HP and LP circuits
against overpressure caused by an increase in the outdoor
temperature, when the unit is off. (E.g.: external fire)
- This fire valve is not considered a safety device as defined in
section 2.11 of appendix 1 of the pressure equipment directive.
• Allowable pressure (PS) LP side
- The LP value (given on the name plate) corresponds
to the situation with the unit switched off. This value is
given according to the pressure/temperature ratio with an
outdoor temperature of 50°C, depending on the unit. These
temperatures correspond to the least favourable situation the
unit could be subjected to, excluding an external fire.
The LP side pipes are sized for the maximum allowable
pressure.
The LP value is linked to the relevant unit and cannot be
exceeded.
EN - 12
power 1400 V to 2400 V
temperature exceeds the maximum