Airedale EasiCool 6kW 64kW - Manual (Page 23)

EasiCool™EZE Precision Air Conditioning
Controls
Temperature Control
A temperature sensor is mounted in the return air with an option for a humidity sensor on full function units.
The temperature sensor is a NTC type thermistor accurate up to +/- 0.25°C and the humidity sensor accurate to +/- 3%
RH at 25°C at the sensor.
The microprocessor senses the return air conditions and maintains the return air temperature and humidity conditions by
controlling cooling, heating, humidification and dehumidification outputs accordingly.
Monitoring
The microprocessor monitors and displays the following values:
• Return Air Temperature
• Return Air Humidity (Optional on Full Function units)
• Condensing Pressure (Optional on DX units only)
• Coil Temperature Sensor (Indoor)
The maintenance of key components such as compressors and air filters can be monitored via a service indicator which
visually demonstrates the status relative to the component service intervals.
Alarm Log
The controller logs and allows viewing of the last 100 conditions recorded in descending chronological order through the
keypad display.
The standard display keypad visually displays operating alarms, however, as an optional extra, a display keypad with
audible alarms is available.
Modbus / Carel BMS Connection
The Airedale controllers shall be able to communicate directly using the Modbus® protocol.
The Modbus® card shall be a small PCB (60mm x 30mm), which can be plugged into the controller to provide it with the
following protocol support:
Modbus® - JBus slave
RTU mode (Remote Terminal Unit) with 8 bit encoding and error handling using 16 bit CRC
Communication standard connection options of RS485 (multipoint) or RS232 (point-point)
Maximum Baud Rate of 19200
The data communication shall be asynchronous serial, 8 data bits, 2 stop bits and no parity (in total 11 bits/datum).
The data/parameters from the controller shall be represented within Modbus® registers, each register containing
information pertaining to temperatures, pressures, setpoint, status, etc and is available to the site integration company in
a spreadsheet format.
23 EasiCool™ EZE Technical Manual 7588163 V1.1.0_02_2013
Introduction