AIREDALE LogiCool InRak Technical Manual page 19

IT Cooling
Controls
Standard Features
Temperature/ Humidity Sensor
Unit mounted temperature and humidity sensor shall be supplied as standard. This shall be mounted at the inlet side of
the unit monitoring return air conditions.
Water Temperature Sensor
A water temperature sensor shall be fitted to the water inlet pipe work.
Tri colour LED for Easy Fault Detection
LED indication for alarm status shall be incorporated in the front face of the InRak unit which signals Healthy, Non
Critical and Critical Alarm respectively (Green, Yellow and Red.)
Optional Features
Flood Detection
Leak detection for the water system, able to report alarm status to the BMS system shall be provided. The unit shall then
be shut down before any damage occurs.
The leak detection tape shall be fitted within the base of the unit.
Smoke Detector
Shall be fitted into the roof of the unit to shut down the unit and activate the alarm upon sensing the presence of smoke.
Fire Detector
Shall be installed in the return air stream to shut down the unit in the event of an unusually high return air temperature.
Filter Change Monitoring
A filter change software timer is included to record the time since the filter was changed and give an alarm if the time is
exceeded. This must be manually reset when the filters are changed.
Aisle Pressure Management
The InRak shall be fitted with Aisle pressure management, which allows the differential pressure across the IT
equipment to be monitored and controlled to achieve:
• Positive air pressure in the cold aisle.
• Negative air pressure in the hot aisle at the server outlet, to prevent backwash of hot air (behind InRak coil guard).
• Controlled differential pressure across the IT hardware so that air is not 'forced' through the IT equipment
Dynamic Air Volume
The compressor will maintain the "air off" temperature while the fans control to the air volume as long as the evaporating
temperature remains within the operating band. However, if the evaporating temperature changes beyond the high
or low differential limits, the fans will modulate to bring the evaporating temperature back within the band, up to the
minimum or maximum air volume band limits. If the evaporating temperature changes beyond that, the compressor will
modulate to bring the evaporating temperature back within the control band. The evaporating temperature set point can
be changed in the controls.
The unit will try to maintain the evaporating temperature as close as possible to the set point whilst maintaining the
cooling demand and the air volume.
Note that at 12°C evaporating temperature the inverter will limit the compressor maximum speed to 90rps from 120rps.
This is to protect the inverter against high currents.
Energy Manager
Analysis of system energy consumption can be monitored via a dedicated LCD display. Unit parameters can be adjusted
via the unit microprocessor control to affect energy usage in line with the system need.
LogiCool InRak™
InRak™ Technical Manual 7462807 V1.11.0_04_2016
19