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Principal components of the
refrigerant circuit
Compressors
The units LD-LDC-LDH-ILD-ILDC-ILDH use hermetic SCROLL
compressors.
Oil
The compressors contain a polyester oil (POE) Copeland
3MAF (32 cSt) in the case of R410A units. If necessary, oil can
be topped up using ICI Emkarate RL 32 CF or Mobil EAL Arctic
22 CC if the 3MAF product is not available in the case of
R410A units.
Refrigerant fluid
Units of size 80 to 1100 run with R410A.
Exchangers
The evaporators are single circuit, brazed plate exchangers.
The evaporators are equipped with polyurethane foam heat
insulation of thickness 10 mm.
The heat transfer fluid must be filtered and internal inspections
must be conducted.
All repairs or modifications to the plate exchangers are
prohibited. Exchangers may only be replaced by an original
part fitted by a qualified engineer. The replacement of the
exchanger must be recorded in the maintenance log.
Thermostatic expansion valve
All units are equipped with a thermostatic expansion valve with
a hermetic monoblock design and factory set to maintain an
excess temperature of 5 to 7°C under all operating conditions.
Dryer
All the units are equipped as standard with a filter dryer which
has the task of keeping the refrigerant circuit clean and free of
humidity. The dryers consist of a molecular filter which allows
them to neutralise any acids which may be located in the
refrigerant circuit.
Liquid sight glass
The liquid sight glass, which is located after the dryer in the
liquid line, makes it possible to monitor both the charge at the
unit and the presence of humidity in the circuit. The presence
of bubbles in the sight glass indicates that the refrigerant fluid
charge is inadequate or that non-condensing products are
present in the refrigerant circuit.
The presence of humidity is signalled by a change in the colour
of the indicator paper located in the sight glass.
Safety regulation and equipment
Electronic regulation and signalling module
All the units in the AQUACIAT range are equipped with a
CONNECT electronic regulation and signalling module based
on a microprocessor.
This electronic module controls the operation of the
compressors. Thus, depending on the cold (or hot) water return
temperature compared to the setpoint, the electronic module
may initiate the stepped start-up or shut-down of the
compressors.
Main functions
●
Regulation of the water temperature:
- chilled water (series LD-LDC-LDH)
- chilled water and hot water (series ILD-ILDC-ILDH)
●
Three types of regulation are possible:
- Difference on water return.
- PIDT at water outlet.
- Regulation as a function of the external temperature
●
In the standard configuration, the units are designed for
regulation on the chilled water return. To obtain PIDT regulation
on the water outlet temperature, refer to the Connect regulation
instructions.
●
Control of the operating parameters.
●
Fault diagnosis.
●
Storage of faults in memory in the event of power failure.
●
Management and automatic equalisation of compressor
operating times (multi-compressor systems).
●
Remote control possibility (start/stop, modification of
setpoint temperature, operating states, general fault) using a
remote control unit (OPTION).
●
Possibility of remote reporting of operating states and faults
via an interface module (OPTION).
FOR A DETAILED DESCRIPTION OF ALL THESE
FUNCTIONS PLEASE REFER TO THE CONNECT
PRACTICAL GUIDE (NO2 27).
