3
Reglermanual - VMGFF102
1 SAFETY CONSIDERATIONS
1.1 - General
Installation, start-up and servicing of equipment can be
hazardous if certain factors particular to the installation are not
considered: operating pressures, presence of electrical
components and voltages and the installation site (elevated
plinths and built-up up structures). Only properly qualifi ed
installation engineers and highly qualifi ed installers and
technicians, fully trained for the product, are authorised to
install and start-up the equipment safely. During all servic-
ing operations all instructions and recommendations which
appear in the installation and service instructions for the
product, as well as on tags and labels fi xed to the equipment
and components and accompanying parts supplied sepa-
rately, must be read, understood and followed.
•
Apply all standard safety codes and practices.
•
Wear safety glasses and gloves.
•
Use the proper tools to move heavy objects. Move units
carefully and set them down gently.
1.2 - Avoid electrocution
Only personnel qualifi ed in accordance with IEC (Inter-
national Electrotechnical Commission) recommendations
may be permitted access to electrical components. It is
particularly recommended that all sources of electricity to
the unit be shut off before any work is begun. Shut off the
main power supply at the main circuit breaker or isolator.
IMPORTANT: This equipment conforms to all applicable
codes regarding electromagnetic compatibility.
2 GENERAL DESCRIPTION
2.1 - General
An electronic control system is used to regulate the AR05
units.
These units have one or two refrigerant circuits.
Controls:
•
compressor start-up to control the water loop
•
the fans to optimise operation of each refrigerant circuit
•
the defrost cycles to ensure the operation of the
refrigerant circuits.
As standard the control system off ers three on/off
commands:
•
Local - on/off command using the keyboard
•
Remote - wired on/off command using volt-free
contacts
•
Network - Comfort Network (CCN) on/off command.
The command type is selected in advance by keyboard.
2.2 - Abbreviations used
In this manual, the refrigerant circuits are called circuit A and
circuit B. The compressors in circuit A are labelled A1, A2 and
A3. Those in circuit B are B1 and B2.
The following abbreviations are used frequently:
CCN Comfort
Network
LED
Light Emitting Diode
LEN
Internal communication bus linking the main
board to the slave boards
SCT
Saturated condensing temperature
SST
Saturated suction temperature
EXV
Electronic expansion valve
PD-AUX
Auxiliary input/output board
3 HARDWARE DESCRIPTION
3.1 - General
The control system consists of an NRCP2-BASE board for
single-circuit units (up to two compressors) and two NRCP2-
BASE boards (one master and one slave board) for units with
three or four compressors. The heat pump units that are
equipped with the additional electric heater stage option
uses an additional PD-AUX board.
All boards communicate via an internal LEN bus. The NRCP2-
BASE boards continuously manage the information received
from the various pressure and temperature probes. The
NRCP2-BASE master board contains the program that
controls the unit.
The user interface includes an alphanumeric eight-line
display, two LEDs with fi ve navigation keys as well as a
contrast control wheel.
Summary of Contents for AR05
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