Lennox AAH041, Инструкция по применению

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AQUA
4
–AGU-1405-E - 6 -
(optional). Thermal protection, however, is carried out by thermistor chains. These are set in the windings of each electric motor and are
controlled by onboard electronics. All units are equipped as standard with a phase sequence relay which inhibits compressor operation
if the phase sequence is not carried out: only one direction of rotation is possible for scroll compressors, as well as for the screw and
Rotary compressors. The unit is suitable for outdoor installation.
4.8 Control and communication
The AQUA4 series units come complete with Advanced Carel, pCO series microprocessor control, in addition to the functions described
below, it is possible to customise the software to meet all system requests. These include cascade management of the units with
‘’step-control’’ or ‘’cascade’’ logic. The microprocessor on board the unit controls the various operating parameters with an electric
panel keypad:
•
Compressor connection/disconnection to maintain the set-point of the chiller inlet water T
•
Alarm management
o
High / low pressure
o
Anti-freeze
o
Flow switch
o
Pump alarm
•
Alarm signals
•
Display of operating parameters
•
Evaporator anti-freeze protection
•
Control of maximum number of compressor starts
•
RS232, RS485 serial output control (optional)
•
Incorrect phase sequence (not viewed on display, prevents the compressor from starting)
Concerning interface communication, Modbus ®, BacNET ® (RS485 or TCP / IP) or LonWorks ® (optional) interface communication
cards are provided for connection to BMS systems as an option.