Danfoss BW10 020-090, Operation Instructions Manual

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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 qualified
installation engineers and highly qualified 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 fixed 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 qualified 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
The BW10 unit has one refrigerant circuit with one or two
compressors.
The unit has an electronic control system to regulate water-
cooled units with or without hydronic.
The control system has the following controls:
• Compressor start-up to control the water loop
• Fixed or variable-flow pumps to optimise the operation of
the refrigerant circuit
As standard, the control system offers three on/off commands:
• Local - on/off command using the keyboard
• Remote - wired on/off command using volt-free contacts
• Network - Carrier Comfort Network (CCN) on/off
command.
The command type is selected in advance by keyboard.
2.2 - Abbreviations used
The BW10 unit has one refrigerant circuit, called circuit A with
one or two compressors (A1, A2).
The following abbreviations are used frequently:
CCN Carrier Comfort Network
DHW Domestic hot water
HDC Heating device control
LED Light Emitting Diode
LEN Internal communication bus linking the main board
to the slave boards
SCT Saturated condensing temperature
SHC Space heating control
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 and a
user interface.
All boards communicate via an internal LEN bus. The NRCP2-
BASE board continuously manages 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 seven-line display,
two LEDs with five navigation keys as well as a contrast
control wheel.