Temperature Control
A temperature sensor shall be mounted in the return air side of the unit to sense the return dry bulb condition
A combined temperature and humidity sensor shall be supplied. The temperature sensor shall be an NTC type
thermistor with an accuracy of not less than +/- 5% at 25°C at the sensor.
The microprocessor shall sense the return air conditions and maintain the return air temperature by controlling cooling
outputs accordingly.
The microprocessor shall monitor and display the following values as a minimum:
● Return Air Temperature
● Fan Run Hours
The maintenance of key components such as air lters shall be monitored via a service indicator which visually
demonstrates the status relative to the component service intervals.
Constant Air Volume
When CAV is installed, the unit measures the differential pressure across the evaporator fans to calculate the air
volume in m
3
/s. The unit modulates evaporator fan speed in order to maintain a constant air volume irrespective of other
environmental conditions (such as a dirty lter). Air volume setpoints can be programmed for each operating mode of
the unit.
Alarm Display
This display cycles through the codes of all active alarms on the unit at 5 second intervals, negating the requirement to
connect the pGD1 display in order to diagnose a faulty system. The alarm display is to be mounted on the outside of the
unit in a visible location protected behind the control panel cover.
Standard Network Features
As standard the controller shall be capable of providing a platform for the following and shall be enabled on request for 2
to 4 units, please specify at order:
Networking
A Local Area Network (pLAN) shall be used to connect up to 4 units to offer intercommunication and Duty/Standby
control. This also allows the connection of computers, printers and modems on the same communications ring.
For further details, please contact Airedale Controls.
BMS Interface Cards
BMS Interface Card controlled units can be interfaced with most BMS which are factory tted, please contact Airedale
for more information.
A wide range of protocols shall be accommodated through the use of interface devices. Available as a standard option
are: ModBus/Jbus, and Carel. For interfaces such as SNMP, LonWorks, Metasys and BACnet, please contact Airedale.
Also available shall be Airedale’s own supervisory plug-in BMS card pCOWEB, based on Ethernet TCP/IP secure
technology with SNMP features. It shall require no proprietary cabling or monitoring software and be supplied
pre-programmed with an IP address for ease of set up. Cables to the BMS to be supplied by others.
Remote On/Off
Terminals for interlocking shall be provided to enable or disable the unit remotely.
Filter Change Alarm
Filter change shall be managed by the software, and shall be based on fan(s) hours run with an alarm being generated
when the pre-set run time limit has been exceeded. The set-point value shall be adjusted to suit each application and is
factory set to 4000 hours.
Hours run log or visual service indicator shall be provided.
Password Protection
The control system integrity shall be maintained by restricting access with a password PIN number. To change the PIN,
please contact Airedale at time of order with the preferred 4 digit number.
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