Electrical Components - AERMEC NRA 2000 Manual Tecnico

Anti-freeze heater
(installed as standard)
Its operation is commanded by the
anti-freeze probe located in the plate
evaporator. It is activated when the water
temperature is +3°C, and deactivated
when the water temperature is +5°C.
The dedicated software in the regulation
card manages the heater.
Refrigerating circuit safety valve
Calibrated at 30 Bar, it cuts in by letting
off the overpressure in the case of
anomalous pressures.
Low pressure transducers TP1,
standard in the heat pumps.
accessory in the cooling only versions
High pressure transducer TP2
standard on all the versions
3.5

ELECTRICAL COMPONENTS

Electrical panel
Contains the power section and the
management of the controls and safety
devices. This conforms with standard
CEI 60204-1, and Electromagnetic
Compatibility Directives EMC 89/336/
EEC and 92/31/EEC.
Door lock sectioner
IT IS POSSIBLE TO ACCESS THE
ELECTRIC PANEL BY disconnecting the
voltage, then using the opening lever of
the panel itself. This lever can be blocked
AER485P1 MODBUS SYSTEM
BOARD
This accessory allows connection of
the unit to BMS supervising systems
BMS with electric standard RS 485
and MODBUS protocol.
AVX anti-vibration support
S p r i n g - o p e r a t e d , a n t i - v i b r a t i o n
supports.
1
DCPX device for low temperatures
It consists of an electronic regulation
card that varies the number of
fan rotations on the basis of the
condensation pressure
GP protection grille
with one or more padlocks during
maintenance, in order to prevent the
machine being powered up accidentally.
Control keypad
Provides full control functions.
For a detailed description of the keypad
refer to the user manual.
Remote control panel
This allows the chiller command
operations to be given from a distance.
- t h e r m o m a g n e t i c c o m p r e s s o r
protection.
- thermomagnetic fan protection;
- thermomagnetic auxiliary protection.
- t her mos t a t f or dischar ge ga s
temperature control
3.6 ELECTRONIC REGULATION
Microprocessor card
Consisting of a management/control
card and a visualisation card. Functions
carried out:
• regulation of evaporator water inlet
temperature (also outlet can be
selected), with thermostat action
up to 12 levels and proportional/
integral control of fan speed.
• delayed compressor start-up.
• operation as chiller, with possibility to
integrate refrigerating capacity by
means of "free-cooling".
• compressor sequence rotation.
• management of low temperature
device (accessory).
• compressor operation hour count.
ACCESSORIES
4
Each kit has two grilles.
PGS daily/weekly timer.
Card to be inserted in the electronic
card of the unit. Allows you to
programme two time bands per day,
and to have different programmings
for each day of the week.
2
TP1 L O W P R E S S U R E
TRANSDUCER
It makes it possible to show the value
of the compressor's intake pressure (2
for circuit) on the microprocessor card
display. Placed on the low pressure
side of the refrigerating circuit, it shuts
down compressor operation in the case
of abnormal operating pressure.
• start/stop.
• reset.
• permanent alarms memory.
• automatic start-up after drop in
voltage.
• multi-lingual message service.
• operation with local or remote
control.
• visualisation of machine status:
ON/OFF compressors;
alarms summary.
• alarms management:
high pressure;
flow switch;
low pressure;
anti-freeze;
compressor overload;
fan overload;
pump overload.
• v i s u a l i s a t i o n o f t h e f o l l o w i n g
parameters:
water inlet temperature;
evaporator water inlet temperature;
water outlet temperature; delta T;
high pressure; low pressure;
waiting time for restart.
• alarms visualisation.
• settings:
a) without password:
cooling set;
total differential;
b) with password:
anti-freeze set;
low pressure exclusion time;
display language;
access code.
For further information, refer to the user
manual.
HYDRAULIC PARALLEL (FOR THE
"OO VERSIONS WITHOUT HYDRO-
NIC KIT")
Connection between the evaporators
made up of:
- 2 Flow meters (1 per circuit)
- Mounted filter
NOTE
The hydraulic parallel is carried out
exclusively in the factory
KEY
1 Standard in models: NRA L - HL
2 Standard in models: NRA H - HL
NOTE
The number in brackets indicates the
amount necessary
7